文件上传，下载，预览，删除（File）

1.公共参数方法
- 1.1公共返回类型定义
- 1.2 分页接口
- 1.3公共实体类
- 1.4 公共的 mapper.java/xml（都放在一起）
- - 1.4.1 FileMapper .java
  - 1.4.2 FileMapper .xml
- 1.5 Dao层
- 1.6 调用常理
- 1.7 数据库执行语句
2.0 文件上传代码（上面有公共的下面提供Controller与ServiceImpl接口）
3.0 文件查询接口代码（上面有公共的下面提供Controller与ServiceImpl接口）
4.0 文件预览/下载接口代码（上面有公共的下面提供Controller与ServiceImpl接口）
- 4.1 下载接口代码（上面有公共的下面提供Controller与ServiceImpl接口）
- 4.2 下载接口代码（上面有公共的下面提供Controller与ServiceImpl接口）
- 4.3 Base64转换demo
5.0 文件删除接口代码（上面有公共的下面提供Controller与ServiceImpl接口）
6.0 网上的（四种） Java下载文件的四种方式详细代码
- 1.以流的方式下载
- 2.下载本地文件
- 3.支持在线打开文件/下载啊的一种方式
- 4.0 网络url下载，并写入浏览器
7.0 导出excel(xls)
- 7.1工具类
- ExcelUtils
- ExcelVO
- ExcelXlsReader
- ExcelXlsxReader
- SheetVO
- RowVO
- CellVO
控制台

我们的业务场景：上传文件之类的东西，并展示；包括CRUD的功能与一体；

1.公共参数方法

1.1公共返回类型定义


package com.aostar.ida.framework.base.vo;import java.io.Serializable;
import java.util.HashMap;
import java.util.Map;import com.aostar.ida.framework.base.TokenHolder;/*** 定义前后端交互对象具体属性** @version 2019年4月17日*/
public class MsgContext implements Serializable {private static final long serialVersionUID = 1L;/*** 服务代码*/private String code = MSG_CODE_SUCCESS;/*** 服务器server端返回成功*/public static final String MSG_CODE_SUCCESS = "1";/*** 服务器server端返回失败*/public static final String MSG_CODE_ERROR = "-1";/*** 通知消息*/private String msg;/*** 结果数据*/private Map<String, Object> result = new HashMap<String, Object>();public MsgContext(){this.setCode(MSG_CODE_SUCCESS);TokenHolder.set(this);}/*** 方便使用，添加返回结果* @param key 值名称* @param value 具体值*/public void addResult(String key, Object value) {if (result == null) {result = new HashMap<String, Object>();}result.put(key, value);}public static MsgContext createErrorContext(String msg) {MsgContext mc = new MsgContext();mc.setCode(MSG_CODE_ERROR);mc.setMsg(msg);return mc;}public static MsgContext createSuccessContext(String msg) {MsgContext mc = new MsgContext();mc.setCode(MSG_CODE_SUCCESS);mc.setMsg(msg);return mc;}public static MsgContext createSuccessContext(String msg, Long id) {MsgContext mc = new MsgContext();mc.setCode(MSG_CODE_SUCCESS);mc.setMsg(msg);mc.addResult("id", id);return mc;}public String getCode() {return code;}public void setCode(String code) {this.code = code;}public String getMsg() {return msg;}public void setMsg(String msg) {this.msg = msg;}public Map<String, Object> getResult() {return result;}public void setResult(Map<String, Object> result) {this.result = result;}}

1.2 分页接口

package com.aostar.ida.business.datasources.vo;import java.io.Serializable;import lombok.Data;
import java.util.Collection;
import java.util.Collections;
import java.util.List;@Datapublic class MyPageInfoVo <T> implements Serializable{private static final long serialVersionUID = 1L;//当前页private Integer pageNum;//每页的数量private Integer pageSize;//当前页的数量private int size;//当前页面第一个元素在数据库中的行号private int startRow;//当前页面最后一个元素在数据库中的行号private int endRow;//总记录数private int total;//总页数private int pages;//结果集private List<T> list;//前一页private int prePage;//下一页private int nextPage;//是否为第一页private boolean isFirstPage = false;//是否为最后一页private boolean isLastPage = false;//是否有前一页private boolean hasPreviousPage = false;//是否有下一页private boolean hasNextPage = false;//导航页码数private int navigatePages;//所有导航页号private int[] navigatepageNums;//导航条上的第一页private int navigateFirstPage;//导航条上的最后一页private int navigateLastPage;public Integer getPageNum() {return pageNum;}public void setPageNum(Integer pageNum) {this.pageNum = pageNum;}public Integer getPageSize() {return pageSize;}public void setPageSize(Integer pageSize) {this.pageSize = pageSize;}public int getSize() {return size;}public void setSize(int size) {this.size = size;}public int getStartRow() {return startRow;}public void setStartRow(int startRow) {this.startRow = startRow;}public int getEndRow() {return endRow;}public void setEndRow(int endRow) {this.endRow = endRow;}public int getTotal() {return total;}public void setTotal(int total) {this.total = total;}public int getPages() {return pages;}public void setPages(int pages) {this.pages = pages;}public List<T> getList() {return list;}public void setList(List<T> list) {this.list = list;}public int getPrePage() {return prePage;}public void setPrePage(int prePage) {this.prePage = prePage;}public int getNextPage() {return nextPage;}public void setNextPage(int nextPage) {this.nextPage = nextPage;}public boolean isFirstPage() {return isFirstPage;}public void setFirstPage(boolean firstPage) {isFirstPage = firstPage;}public boolean isLastPage() {return isLastPage;}public void setLastPage(boolean lastPage) {isLastPage = lastPage;}public boolean isHasPreviousPage() {return hasPreviousPage;}public void setHasPreviousPage(boolean hasPreviousPage) {this.hasPreviousPage = hasPreviousPage;}public boolean isHasNextPage() {return hasNextPage;}public void setHasNextPage(boolean hasNextPage) {this.hasNextPage = hasNextPage;}public int getNavigatePages() {return navigatePages;}public void setNavigatePages(int navigatePages) {this.navigatePages = navigatePages;}public int[] getNavigatepageNums() {return navigatepageNums;}public void setNavigatepageNums(int[] navigatepageNums) {this.navigatepageNums = navigatepageNums;}public int getNavigateFirstPage() {return navigateFirstPage;}public void setNavigateFirstPage(int navigateFirstPage) {this.navigateFirstPage = navigateFirstPage;}public int getNavigateLastPage() {return navigateLastPage;}public void setNavigateLastPage(int navigateLastPage) {this.navigateLastPage = navigateLastPage;}/*** 对list集合进行分页* @param list 需要分页的集合* @param pageNum 当前页* @param pageSize 每页的数量*/public MyPageInfoVo(List<T> list,Integer pageNum,Integer pageSize) {this(list, 8, pageNum, pageSize);}/*** 对list集合进行分页* @param list 需要分页的集合* @param navigatePages  导航页码数* @param pageNum 当前页* @param pageSize 每页的数量*/public MyPageInfoVo(List<T> list, int navigatePages,int pageNum,int pageSize) {if (list instanceof Collection) {// 总记录数this.total = list.size();// 为了跟pageHelper一致，当pageNum<1时,按第一页处理int yourPageNum = pageNum;pageNum= pageNum<1 ? 1:pageNum;// 当前页码this.pageNum = pageNum;// 每页显示的记录数this.pageSize = pageSize;// 总页码数this.pages = (int)Math.ceil(this.total*1.0/this.pageSize);// 导航条页码数this.navigatePages = navigatePages;// 开始行号this.startRow = this.pageNum * this.pageSize - (this.pageSize - 1);// 结束行号this.endRow = this.pageNum * this.pageSize;// 当结束行号>总行数，结束行号=0if(this.endRow > this.total){if(this.startRow > this.total){this.endRow = 0;this.startRow = 0;}else {this.endRow =this.total;}}//计算导航页calcNavigatepageNums();//计算前后页，第一页，最后一页calcPage();//判断页面边界judgePageBoudary();// 当pageNum超过最大页数，则size=0，list为空if(this.pageNum > this.pages){this.size = 0;this.list = Collections.EMPTY_LIST;}else {this.list = list.subList(startRow - 1,endRow);this.size = this.list.size();}this.pageNum = yourPageNum;}}/*** 计算导航页*/private void calcNavigatepageNums() {//当总页数小于或等于导航页码数时if (pages <= navigatePages) {navigatepageNums = new int[pages];for (int i = 0; i < pages; i++) {navigatepageNums[i] = i + 1;}} else { //当总页数大于导航页码数时navigatepageNums = new int[navigatePages];int startNum = pageNum - navigatePages / 2;int endNum = pageNum + navigatePages / 2;if (startNum < 1) {startNum = 1;//(最前navigatePages页for (int i = 0; i < navigatePages; i++) {navigatepageNums[i] = startNum++;}} else if (endNum > pages) {endNum = pages;//最后navigatePages页for (int i = navigatePages - 1; i >= 0; i--) {navigatepageNums[i] = endNum--;}} else {//所有中间页for (int i = 0; i < navigatePages; i++) {navigatepageNums[i] = startNum++;}}}}/*** 计算前后页，第一页，最后一页*/private void calcPage() {if (navigatepageNums != null && navigatepageNums.length > 0) {navigateFirstPage = navigatepageNums[0];navigateLastPage = navigatepageNums[navigatepageNums.length - 1];if (pageNum > 1) {prePage = pageNum - 1;}if (pageNum < pages) {nextPage = pageNum + 1;}}}/*** 判定页面边界*/private void judgePageBoudary() {isFirstPage = pageNum == 1;isLastPage = pageNum == pages;hasPreviousPage = pageNum > 1;hasNextPage = pageNum < pages;}}

1.3公共实体类

package com.aostar.ida.business.datasources.vo;import com.aostar.ida.framework.base.vo.BaseVO;
import org.hibernate.validator.constraints.Length;import java.util.Date;public class FileDypeVo {/*** 主键*/private Long id;/*** 文件名称*/private String fileName;/*** 文件路径*/private String filePath;/*** 文件所属类型 状态(1:a文件 2:B文件 3:C文件)*/@Length(max = 1, message = "状态不得超过1个字符")private String fileType;/*** 文件上传时间*/private String filePutDate;/*** 上传分页类型*/private String filePageType;public Long getId() {return id;}public void setId(Long id) {this.id = id;}public String getFileName() {return fileName;}public void setFileName(String fileName) {this.fileName = fileName;}public String getFilePath() {return filePath;}public void setFilePath(String filePath) {this.filePath = filePath;}public String getFileType() {return fileType;}public void setFileType(String fileType) {this.fileType = fileType;}public String getFilePutDate() {return filePutDate;}public void setFilePutDate(String filePutDate) {this.filePutDate = filePutDate;}public String getFilePageType() {return filePageType;}public void setFilePageType(String filePageType) {this.filePageType = filePageType;}@Overridepublic String toString() {return "FileDypeVo [id=" + id + ", fileName=" + fileName + ", filePath=" + filePath + ", fileType=" + fileType+ ", filePutDate=" + filePutDate + ", filePageType=" + filePageType + "]";}}

1.4 公共的 mapper.java/xml（都放在一起）

1.4.1 FileMapper .java

package com.aostar.ida.business.datasources.dao;import org.apache.ibatis.annotations.Param;import com.aostar.ida.business.datasources.vo.FileDypeVo;import java.util.List;/*** 上传文件*/
public interface FileMapper {int fileinsert(FileDypeVo fileDypeVo);List<FileDypeVo> selectFile(@Param("filePageType")String filePageType);FileDypeVo selectFileId(@Param("id")Long id);}

1.4.2 FileMapper .xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.aostar.ida.business.datasources.dao.FileMapper"><resultMap id="FileResultMap" type="com.aostar.ida.business.datasources.vo.FileDypeVo"><id column="id" property="id" jdbcType="BIGINT" /><result column="file_Name" property="fileName" jdbcType="VARCHAR" /><result column="file_Path" property="filePath" jdbcType="VARCHAR" /><result column="file_Type" property="fileType" jdbcType="VARCHAR" /><result column="file_Put_Date" property="filePutDate" jdbcType="VARCHAR" /><result column="file_page_Type" property="filePageType" jdbcType="VARCHAR" /></resultMap><sql id="File_Column_List" >id, file_Name, file_Path, file_Type, file_Put_Date, file_page_Type</sql><insert id="fileinsert" parameterType="com.aostar.ida.business.datasources.vo.FileDypeVo" >insert into com_ds_file (id, file_Name, file_Path,file_Type, file_Put_Date,file_page_Type)values (#{id,jdbcType=BIGINT}, #{fileName,jdbcType=VARCHAR}, #{filePath,jdbcType=VARCHAR},#{fileType,jdbcType=VARCHAR}, #{filePutDate,jdbcType=VARCHAR},#{filePageType,jdbcType=VARCHAR} )</insert><select id="selectFile" resultMap="FileResultMap"  parameterType="com.aostar.ida.business.datasources.vo.FileDypeVo">select <include refid="File_Column_List"/> from com_ds_file where file_page_Type=#{filePageType}</select><select id="selectFileId" resultMap="FileResultMap"  parameterType="com.aostar.ida.business.datasources.vo.FileDypeVo">select <include refid="File_Column_List"/> from com_ds_file where id=#{id}</select></mapper>

1.5 Dao层

package com.aostar.ida.business.datasources.service;import java.util.List;import com.aostar.ida.business.datasources.vo.DsDragVO;
import com.aostar.ida.business.datasources.vo.DsTypeVO;
import com.aostar.ida.framework.base.exception.ServiceException;public interface DataSourcesService{/*** 上传文件* @param request* @param uploadFile* @return* @throws ServiceException*/Long updateFile(HttpServletRequest request, MultipartFile uploadFile,String fileType,String filePageType)throws ServiceException;/*** 查询* @param pageNum* @param pageSize* @param filePageType* @return*/MyPageInfoVo<FileDypeVo> selectFile(Integer pageNum,Integer pageSize,String filePageType);/*** 删除文件* @param id* @return*/Long delectFile(Long id);/*** 下载预览* @param response* @param id* @param isOnLine* @return* @throws IOException*/FileDypeVo downFile(HttpServletResponse response,Long id,Boolean isOnLine)  throws  IOException;}

1.6 调用常理

package com.aostar.ida.framework.base;
/** 定义文件 使用常量   yan 2022/10/13* */
public interface FileController {/*** 上传文件 页面1  文件管理*/String FILE_FIRSTLY = "10"; /*** 上传文件 页面2  成果管理*/String FILE_SECOND = "20";/*** 上传文件 页面3  典型场景管理管理*/String FILE_THIRD = "30";/*** 页面下对应子模块* 页面1*   1.帮助文档*   2.规范*   3.设计小样*   4.场景解说词*   页面2*   1.设计小样*   2.场景解说词*   3.第三方应用成功*/String FILE_ONE = "1";String FILE_TWO = "2";String FILE_THREE = "3";String FILE_FOUR = "4";/*** 路径拼接   页面1* */String FILE_FIRSTLY_PATH = "//FIRSTLY//";/*** 路径拼接   页面2* */String FILE_SECOND_PATH = "//SECOND//";/*** 路径拼接   页面3* */String FILE_THIRD_PATH = "//THIRD//";}

1.7 数据库执行语句

/*Navicat Premium Data TransferSource Server         : 可视化项目Source Server Type    : MySQLSource Server Version : 50736Source Host           : localhost:3306Source Schema         : zhongdianTarget Server Type    : MySQLTarget Server Version : 50736File Encoding         : 65001Date: 14/10/2022 11:39:07
*/SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;-- ----------------------------
-- Table structure for com_ds_file
-- ----------------------------
DROP TABLE IF EXISTS `com_ds_file`;
CREATE TABLE `com_ds_file`  (`id` bigint(11) NOT NULL AUTO_INCREMENT,`file_Name` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_bin NULL DEFAULT NULL,`file_Path` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_bin NULL DEFAULT NULL,`file_Type` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_bin NULL DEFAULT NULL,`file_Put_Date` varchar(100) CHARACTER SET utf8mb4 COLLATE utf8mb4_bin NULL DEFAULT NULL,`file_page_Type` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_bin NULL DEFAULT NULL,PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 59766911012865 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_bin ROW_FORMAT = Dynamic;SET FOREIGN_KEY_CHECKS = 1;

2.0 文件上传代码（上面有公共的下面提供Controller与ServiceImpl接口）

 /*** 上传接口文件* @param multipartFile* @param request* @param fileType* @param filePageType* @return*/@RequestMapping(value ="/updateFile" ,method = RequestMethod.POST)@ResponseBody//@RequestParam()注解的参数要和前端代码name属性值对应public MsgContext updateFile(@RequestParam("file") MultipartFile multipartFile,HttpServletRequest request,@RequestParam("fileType") String fileType,@RequestParam("filePageType") String filePageType){try{//判断文件是否为空 isEmptyif (multipartFile == null){return MsgContext.createErrorContext("上传文件为空");}MultipartFile uploadFile = getSingleFile(request);Long id = dsService.updateFile(request, uploadFile,fileType,filePageType);return MsgContext.createSuccessContext("新增成功", id);}catch (Exception e) {return MsgContext.createErrorContext("上传失败");}}

/*** 上传文件* * @throws IOException*/@Override@Transactional(readOnly = false)public Long updateFile(HttpServletRequest request, MultipartFile multipartFile, String fileType,String filePageType) throws ServiceException {// 获取文件的原名称 getOriginalFilename 后缀String OriginalFilename = multipartFile.getOriginalFilename();if (!(OriginalFilename.endsWith(".xlsx") || OriginalFilename.endsWith(".xls")|| OriginalFilename.endsWith(".txt"))) {throw new ServiceException("导入文件格式错误，请导入xlsx/xls/txt格式的文件！");}String name = OriginalFilename.substring(0, OriginalFilename.indexOf("."));// 获取时间戳和文件的扩展名，拼接成一个全新的文件名； 用时间戳来命名是为了避免文件名冲突String fileName = name + "-" + System.currentTimeMillis() + "."+ OriginalFilename.substring(OriginalFilename.lastIndexOf(".") + 1);// 定义文件存放路径String filePath = null;if (filePageType.equals(FileController.FILE_FIRSTLY)) {filePath = remoteBaseUrl + FileController.FILE_FIRSTLY_PATH;} else if (filePageType.equals(FileController.FILE_THIRD)) {filePath = remoteBaseUrl + FileController.FILE_THIRD_PATH;} else {filePath = remoteBaseUrl + FileController.FILE_SECOND_PATH;}// 不存在新增 一个目录（文件夹） 路径+文件名+后缀File dest = new File(filePath + fileName);// 判断filePath目录是否存在，如不存在，就新建一个if (!dest.getParentFile().canExecute()) {dest.getParentFile().mkdirs(); // 新建一个目录}FileDypeVo fileDypeVo = new FileDypeVo();SimpleDateFormat sdf = new SimpleDateFormat();// 格式化时间sdf.applyPattern("yyyy-MM-dd HH:mm:ss");Date date = new Date();fileDypeVo.setId(IDNexter.getInstance().next());fileDypeVo.setFileName(fileName);fileDypeVo.setFilePath(filePath);fileDypeVo.setFileType(fileType);fileDypeVo.setFilePageType(filePageType);fileDypeVo.setFilePutDate(sdf.format(date));LOGGER.info("保存数据" + JSON.toJSONString(fileDypeVo + "OriginalFilename" + OriginalFilename));int bdCnt = fileMapper.fileinsert(Sutil.checkData(StringUtils.EMPTY, fileDypeVo));if (bdCnt < 1) {throw new ServiceException("导入文件失败");}try {// 文件输出multipartFile.transferTo(dest);} catch (Exception e) {e.printStackTrace();// 拷贝失败要有提示return fileDypeVo.getId();}return fileDypeVo.getId();}

3.0 文件查询接口代码（上面有公共的下面提供Controller与ServiceImpl接口）

/*** 查询上传接口* @param filePageType* @param pageNum* @param pageSize* @return*/@RequestMapping(value ="/selectFile" ,method = RequestMethod.POST)@ResponseBodypublic MsgContext selectFile(@RequestParam("filePageType") String filePageType,@RequestParam(value = "pageNum",name = "pageNum" ,required = false,defaultValue = "1")Integer pageNum,@RequestParam(value = "pageSize",name = "pageSize",required = false,defaultValue = "1000")Integer pageSize){try{//判断文件是否为空 isEmptyif (filePageType == null){return MsgContext.createErrorContext("类型为空");}MsgContext mc = new MsgContext();MyPageInfoVo<FileDypeVo> fInfoVo = dsService.selectFile(pageNum,pageSize,filePageType);mc.addResult("data", fInfoVo);mc.setMsg("查询成功");return mc;}catch (Exception e) {return MsgContext.createErrorContext("上传失败,原因=》"+e.getMessage());}}

/*** 查询文件* */@Overridepublic MyPageInfoVo<FileDypeVo> selectFile(Integer pageNum, Integer pageSize, String filePageType) {List<FileDypeVo> fileDypeVos = fileMapper.selectFile(filePageType);MyPageInfoVo<FileDypeVo> myPageInfo = new MyPageInfoVo<>(fileDypeVos, pageNum, pageSize);// TODO Auto-generated method stubreturn myPageInfo;}

4.0 文件预览/下载接口代码（上面有公共的下面提供Controller与ServiceImpl接口）

isOnLine 默认true在线打开 false下载

 /*** 文件预览以及下载接口* @param response* @param id* @param isOnLine* @return*/@RequestMapping(value ="/downFile" ,method = RequestMethod.POST)@ResponseBodypublic MsgContext downFile(HttpServletResponse response,@RequestParam("id") Long id,@RequestParam(value = "isOnLine",name = "isOnLine" ,required = false,defaultValue = "true")Boolean isOnLine){//isOnLine 默认true在线打开  false下载try{//判断文件是否为空 isEmptyif (id == null){return MsgContext.createErrorContext("id不能为空");}MsgContext mc = new MsgContext();FileDypeVo  fInfoVo = dsService.downFile(response,id,isOnLine);mc.addResult("data", fInfoVo);mc.setMsg("查询成功");return mc;}catch (Exception e) {return MsgContext.createErrorContext("下载/预览失败,原因=》"+e.getMessage());}}

@Overridepublic FileDypeVo downFile(HttpServletResponse response, Long id, Boolean isOnLine)  throws IOException {FileDypeVo fileDypeVos = fileMapper.selectFileId(id);String path = fileDypeVos.getFilePath();String name = fileDypeVos.getFileName();File file = new File(path+name);LOGGER.info("file==>"+file+"|file.exists()==>"+file.exists());if (!file.exists()) {throw new ServiceException("未在指定路径发现该文件"+file);}byte[] buf = new byte[1024];int len = 0;BufferedInputStream br = new BufferedInputStream(new FileInputStream(file));response.reset(); // 非常重要if (isOnLine) { // 在线打开方式URL url = new URL("file:///" + path);response.setContentType(url.openConnection().getContentType());response.setHeader("Content-Disposition", "inline; filename=" + name);// 文件名应该编码成UTF-8} else { // 纯下载方式response.setContentType("application/x-msdownload");response.setHeader("Content-Disposition", "attachment; filename=" + name);}OutputStream out = response.getOutputStream();while ((len = br.read(buf)) > 0)out.write(buf, 0, len);br.close();out.close();// TODO Auto-generated method stubreturn null;}

4.1 下载接口代码（上面有公共的下面提供Controller与ServiceImpl接口）

下载：Controller

/*** 文件下载接口* @param response* @param id* @param isOnLine* @return*/@RequestMapping(value ="/printFile" ,method = RequestMethod.POST)@ResponseBodypublic MsgContext printFile(HttpServletResponse response,@RequestParam("id") Long id){try{//判断文件是否为空 isEmptyif (id == null){return MsgContext.createErrorContext("id不能为空");}MsgContext mc = new MsgContext();String  fInfoVo = dsService.printFile(id);mc.addResult("data", fInfoVo);mc.setMsg("查询成功");return mc;}catch (Exception e) {return MsgContext.createErrorContext("预览失败,原因=》"+e.getMessage());}}

ServerImpl

 @Overridepublic FileDypeVo downFile(HttpServletResponse response,Long id){//根据查询获取地址和文件名FileDypeVo fileDypeVos = fileMapper.selectFileId(id);String path = fileDypeVos.getFilePath();String name = fileDypeVos.getFileName();File file = new File(path + name);LOGGER.info("file==>" + file + "|file.exists()==>" + file.exists());if (!file.exists()) {throw new ServiceException("未在指定路径发现该文件" + file);}//效验格式后缀        if (!(name.endsWith(".xlsx") || name.endsWith(".xls")|| name.endsWith(".txt") || name.endsWith(".pdf")|| name.endsWith(".docx") || name.endsWith(".doc")|| name.endsWith(".jpg") || name.endsWith(".png")|| name.endsWith(".zip"))) {throw new ServiceException("导入文件格式错误，请导入xlsx/xls/txt/png/doc/docx/pdf/jpg/zip格式的文件！");}OutputStream os = null;BufferedOutputStream out = null;BufferedInputStream is = null;try {os = response.getOutputStream();response.reset();// 清空输出流response.setContentType("application/x-msdownload");response.setCharacterEncoding("utf-8");response.setContentType("text/html;charset=utf-8");
//      response.setHeader("Content-disposition", "attachment; filename="+URLEncoder.encode(filename, "UTF-8")+"."+subfix);// 设定输出文件头//开始下载      name 是有后缀的 ab.pdfresponse.setHeader("Content-disposition", "attachment; filename="+URLEncoder.encode(name, "UTF-8"));// 设定输出文件头is = new BufferedInputStream(new FileInputStream(new File(path+name)));out = new BufferedOutputStream(os);       byte[] buff = new byte[1024];int len = 0;while ((len = is.read(buff, 0, buff.length)) != -1) {out.write(buff, 0, len);}out.flush();} catch (IOException e) {e.printStackTrace();throw new ServiceException("下载失败");} finally {IOUtils.closeQuietly(out);IOUtils.closeQuietly(is);IOUtils.closeQuietly(os);}return fileDypeVos;}

前段Vue：
/sys/comp/downLoad 接口路径
row 传的id的值进行查询相关路径
token 我们有项目验证看项目情况

window.location.href = `${ipConfig.SERVER_IP}/sys/comp/downLoad?id=${row}&token=${token}`

4.2 下载接口代码（上面有公共的下面提供Controller与ServiceImpl接口）

控制台代码Controller

/*** 文件预览接口* @param response* @param id* @param isOnLine* @return*/@RequestMapping(value ="/printFile" ,method = RequestMethod.POST)@ResponseBodypublic MsgContext printFile(HttpServletResponse response,@RequestParam("id") Long id){try{//判断文件是否为空 isEmptyif (id == null){return MsgContext.createErrorContext("id不能为空");}MsgContext mc = new MsgContext();String  fInfoVo = dsService.printFile(id);mc.addResult("data", fInfoVo);mc.setMsg("查询成功");return mc;}catch (Exception e) {return MsgContext.createErrorContext("预览失败,原因=》"+e.getMessage());}}

Impl代码 采用转换base64的方式

/*** 预览*/@Overridepublic String printFile(Long id) throws IOException {try {FileDypeVo fileDypeVos = fileMapper.selectFileId(id);String path = fileDypeVos.getFilePath();String name = fileDypeVos.getFileName();File file = new File(path+name);FileInputStream inputFile = new FileInputStream(file);byte[] buffer = new byte[(int) file.length()];inputFile.read(buffer);inputFile.close();System.out.println(new BASE64Encoder().encode(buffer));return new BASE64Encoder().encode(buffer);} catch (Exception e) {throw new ServiceException("预览失败" + e.getMessage());// TODO: handle exception}}

前段代码：

npm install --save vue-pdf  //下载插件<pdf :style="{ width: pdfWidth + '%',top:'20px' }" v-for="i in numPages" :key="i" :src="src" :page="i" ref="myPdfComponent"></pdf>import pdf from "vue-pdf";
import CMapReaderFactory from "vue-pdf/src/CMapReaderFactory.js";components: {pdf,  },previewFile({ id: fileId }).then(res => {if (res.code == 1) {let da = res.result.datathis.isShowOk = truelet datas = "data:application/pdf;base64," +  da;this.src = pdf.createLoadingTask({ url: datas, CMapReaderFactory });console.log(this.src)this.src.promise.then(pdf => {this.numPages = pdf.numPages;});} else {this.$message.error(res.msg)}})

前段相关模块；

4.3 Base64转换demo

package com.example.democrud.democurd.controller;import sun.misc.BASE64Encoder;import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;public class TestDemo2 {public static void main(String[] args) throws Exception {String path="G:\\可视化工具\\XXX\\前端\\client05\\public\\file\\FIRSTLY\\a.pdf";TestDemo2.encodeBase64File(path);}/**actions: 将文件转成base64 字符串*path：文件路径*/public static String encodeBase64File(String path) throws Exception {File file = new File(path);FileInputStream inputFile = new FileInputStream(file);byte[] buffer = new byte[(int) file.length()];inputFile.read(buffer);inputFile.close();System.out.println(new BASE64Encoder().encode(buffer));return new BASE64Encoder().encode(buffer);}/**actions: 将base64字符保存文本文件*targetPath：文件路径*base64Code: base64字符串*/public void toFile(String base64Code, String targetPath) throws Exception {byte[] buffer = base64Code.getBytes();FileOutputStream out = new FileOutputStream(targetPath);out.write(buffer);out.close();}}

5.0 文件删除接口代码（上面有公共的下面提供Controller与ServiceImpl接口）

@RequestMapping(value ="/delectFile" ,method = RequestMethod.POST)@ResponseBodypublic MsgContext delectFile(@RequestParam("id") Long id){try{//判断文件是否为空 isEmptyif (id == null){return MsgContext.createErrorContext("请选择需要删除文件,文件不能为空");}MsgContext mc = new MsgContext();Long  fInfoVo = dsService.delectFile(id);if (fInfoVo>1) {mc.addResult("data", "删除成功");}          return mc;}catch (Exception e) {return MsgContext.createErrorContext("删除失败,原因=》"+e.getMessage());}}

@Overridepublic Long delectFile(Long id) {if (id==null) {throw new ServiceException("删除id不容许为空");}FileDypeVo fileDypeVos = fileMapper.selectFileId(id);String path = fileDypeVos.getFilePath();String name = fileDypeVos.getFileName();File file = new File(path+name);LOGGER.info("file==>"+file+"|file.exists()==>"+file.exists());if (!file.exists()) {throw new ServiceException("未在指定路径发现该文件"+file);}boolean lFile=file.delete();Long le=null;if (lFile) {le=1L;}// TODO Auto-generated method stubreturn le;}

大家根据自己的业务场景去设计相关接口需求；上面只供参考；有问题或者疑问请提出；

6.0 网上的（四种） Java下载文件的四种方式详细代码

1.以流的方式下载

public HttpServletResponse download(String path, HttpServletResponse response) {try {// path是指欲下载的文件的路径。File file = new File(path);// 取得文件名。String filename = file.getName();// 取得文件的后缀名。String ext = filename.substring(filename.lastIndexOf(".") + 1).toUpperCase();// 以流的形式下载文件。InputStream fis = new BufferedInputStream(new FileInputStream(path));byte[] buffer = new byte[fis.available()];fis.read(buffer);fis.close();// 清空responseresponse.reset();// 设置response的Headerresponse.addHeader("Content-Disposition", "attachment;filename=" + new String(filename.getBytes()));response.addHeader("Content-Length", "" + file.length());OutputStream toClient = new BufferedOutputStream(response.getOutputStream());response.setContentType("application/octet-stream");toClient.write(buffer);toClient.flush();toClient.close();} catch (IOException ex) {ex.printStackTrace();}return response;}

2.下载本地文件

public void downloadLocal(HttpServletResponse response) throws FileNotFoundException {// 下载本地文件String fileName = "Operator.doc".toString(); // 文件的默认保存名// 读到流中InputStream inStream = new FileInputStream("c:/Operator.doc");// 文件的存放路径// 设置输出的格式response.reset();response.setContentType("bin");response.addHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\"");// 循环取出流中的数据byte[] b = new byte[100];int len;try {while ((len = inStream.read(b)) > 0)response.getOutputStream().write(b, 0, len);inStream.close();} catch (IOException e) {e.printStackTrace();}}

3.支持在线打开文件/下载啊的一种方式

public class FileDownloadUtil {/*** 支持在线打开文件的一种方式* @param filePath* @param response* @param isOnLine* @throws Exception*/public void downLoad(String filePath, HttpServletResponse response, boolean isOnLine) throws Exception {File f = new File(filePath);if (!f.exists()) {response.sendError(404, "File not found!");return;}BufferedInputStream br = new BufferedInputStream(new FileInputStream(f));byte[] buf = new byte[8192];int len = 0;response.reset(); // 非常重要if (isOnLine) { // 在线打开方式URL u = new URL("file:///" + filePath);response.setContentType(u.openConnection().getContentType());response.setHeader("Content-Disposition", "inline; filename=" + f.getName());// 文件名应该编码成UTF-8} else { // 纯下载方式response.setContentType("application/x-msdownload");response.setHeader("Content-Disposition", "attachment; filename=" + f.getName());}OutputStream out = response.getOutputStream();while ((len = br.read(buf)) > 0){out.write(buf, 0, len);}br.close();out.close();}
}

4.0 网络url下载，并写入浏览器

public class FileDownloadUtil {/*** 网络url下载* @param request* @param response*/public void downloadFileURL(HttpServletRequest request, HttpServletResponse response) {String fileUrl = "http://oss.aliyun.cn/pro/2021/06/30/2635a51b-3338-478c-9e46-0e7834afabbb.pdf";try {URL url = new URL(fileUrl);URLConnection conn = url.openConnection();InputStream inStream = conn.getInputStream();//对文件名进行编码防止中文乱码String filename = FileDownloadUtil.encodeDownloadFilename("文件.pdf", request);response.setContentType("application/x-msdownload");response.setHeader("Content-Disposition", "attachment; filename=" + filename);OutputStream out = response.getOutputStream();byte[] buffer = new byte[8192];int length;while ((length = inStream.read(buffer)) != -1) {out.write(buffer, 0, length);}inStream.close();out.close();} catch (IOException e) {e.printStackTrace();}}
}public class FileDownloadUtil {/*** 下载文件时，针对不同浏览器，进行附件名的编码** @param filename 载文件名* @param request 请求request* @return 编码后的下载附件名* @throws IOException*/public static String encodeDownloadFilename(String filename, HttpServletRequest request)throws IOException {String agent = request.getHeader("user-agent");//获得游览器if (agent.contains("Firefox")) { // 火狐浏览器filename = "=?UTF-8?B?"+ Base64.getEncoder().encode(filename.getBytes("utf-8"))+ "?=";filename = filename.replaceAll("\r\n", "");} else { // IE及其他浏览器filename = URLEncoder.encode(filename, "utf-8");filename = filename.replace("+"," ");}return filename;}
}

7.0 导出excel(xls)

7.1工具类

ExcelUtils

/** 文件名：ExcelUtils.java* 版权：Copyright by aostarit* 描述：excel表格工具类* * */package com.aostar.ida.framework.util.excel;import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;import org.apache.commons.collections.CollectionUtils;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang.StringUtils;
import org.apache.log4j.Logger;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.openxml4j.exceptions.OpenXML4JException;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellValue;
import org.apache.poi.ss.usermodel.DateUtil;
import org.apache.poi.ss.usermodel.FormulaEvaluator;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.xml.sax.SAXException;import com.aostar.ida.framework.base.IdaConstants;
import com.aostar.ida.framework.base.exception.ServiceException;
import com.aostar.ida.framework.util.DateUtils;/*** 数据转excel和excel转数据* */
public class ExcelUtils {/*** 日志对象*/private static final Logger LOGGER = Logger.getLogger(ExcelUtils.class);/*** * 把java数据转成excel对象 调用方保证表头和数据的顺序对应，本方法不做检查* * @param datas*            数据列表* @param titles*            表头 --单行* @return excel对象*/public static HSSFWorkbook data2Excel(List<List<Object>> datas, List<String> titles, String sheetName) {HSSFWorkbook book = new HSSFWorkbook();HSSFCellStyle style = getCellStyle(book);HSSFFont font = getFont(book);// 把字体应用到样式style.setFont(font);// 创建sheetHSSFSheet sheet = book.createSheet(sheetName);// 设置表格默认列宽度为15个字节// sheet.setDefaultColumnWidth((short)15);// 设置表头--单行HSSFRow titleRow = sheet.createRow(0);// 创建标题行for (int i = 0; i < titles.size(); i++) {HSSFCell cell = titleRow.createCell(i);cell.setCellStyle(style);cell.setCellValue(titles.get(i));}// 写入数据for (int i = 0; i < datas.size(); i++) {// 创建数据行HSSFRow dataRow = sheet.createRow(i + 1);List<Object> rowDatas = datas.get(i);if (CollectionUtils.isEmpty(rowDatas)) {continue;}for (int j = 0; j < rowDatas.size(); j++) {HSSFCell cell = dataRow.createCell(j);setCellValue(cell, rowDatas.get(j));}}return book;}public static HSSFWorkbook createWorkbook() {HSSFWorkbook book = new HSSFWorkbook();return book;}public static void addNewSheet(HSSFWorkbook book, List<List<Object>> datas, List<String> titles, String sheetName) {HSSFCellStyle style = getCellStyle(book);HSSFFont font = getFont(book);// 把字体应用到样式style.setFont(font);// 创建sheetHSSFSheet sheet = book.createSheet(sheetName);// 设置表格默认列宽度为15个字节// sheet.setDefaultColumnWidth((short)15);// 设置表头--单行HSSFRow titleRow = sheet.createRow(0);// 创建标题行for (int i = 0; i < titles.size(); i++) {HSSFCell cell = titleRow.createCell(i);cell.setCellStyle(style);cell.setCellValue(titles.get(i));}// 写入数据for (int i = 0; i < datas.size(); i++) {// 创建数据行HSSFRow dataRow = sheet.createRow(i + 1);List<Object> rowDatas = datas.get(i);if (CollectionUtils.isEmpty(rowDatas)) {continue;}for (int j = 0; j < rowDatas.size(); j++) {HSSFCell cell = dataRow.createCell(j);setCellValue(cell, rowDatas.get(j));}}}// 表格样式private static HSSFCellStyle getCellStyle(HSSFWorkbook book) {HSSFCellStyle style = book.createCellStyle();// 设置样式style.setFillForegroundColor(HSSFColor.SKY_BLUE.index);style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);style.setBorderBottom(HSSFCellStyle.BORDER_THIN);style.setBorderLeft(HSSFCellStyle.BORDER_THIN);style.setBorderRight(HSSFCellStyle.BORDER_THIN);style.setBorderTop(HSSFCellStyle.BORDER_THIN);style.setAlignment(HSSFCellStyle.ALIGN_CENTER);return style;}// 设置字体private static HSSFFont getFont(HSSFWorkbook book) {HSSFFont font = book.createFont();font.setColor(HSSFColor.VIOLET.index);font.setFontHeightInPoints((short) 12);font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);return font;}// 单元格填充数据private static void setCellValue(HSSFCell cell, Object value) {if (null == value) {return;}if (value instanceof Boolean) {cell.setCellValue((Boolean) value);} else if (value instanceof Date) {cell.setCellValue(DateUtils.dateToString((Date) value));} else if (value instanceof Calendar) {cell.setCellValue((Calendar) value);} else if (value instanceof Double) {cell.setCellValue((Double) value);} else if (value instanceof String) {if (((String) value).length() > 32767) {value = ((String) value).substring(0, 32767);}cell.setCellValue((String) value);} else {cell.setCellValue(value.toString());}}public static ExcelVO byte2BigExcel(byte[] bytes, int type) throws IOException, OpenXML4JException, SAXException {ExcelVO excelVO = null;if (IdaConstants.EXCEL_TYPE_XLS == type) { // 处理excel2003文件// ExcelXlsReader excelXls = new ExcelXlsReader();// excelXls.process(fileName);// 暂时2003用老的方式处理return byte2Excel(bytes, type);} else if (IdaConstants.EXCEL_TYPE_XLSX == type) {// 处理excel2007文件ExcelXlsxReader excelXlsxReader = new ExcelXlsxReader();excelVO = excelXlsxReader.process(bytes);} else {return null;}return excelVO;}/*** * 将字节流转换为excel对象* * @param bytes*            内容* @param type*            文件类型* @return excel对象*/public static ExcelVO byte2Excel(byte[] bytes, int type) {Workbook wb = null;InputStream is = new ByteArrayInputStream(bytes);if (IdaConstants.EXCEL_TYPE_XLS == type) {try {wb = new HSSFWorkbook(is);} catch (IOException e) {LOGGER.error(e.getMessage());return null;}} else if (IdaConstants.EXCEL_TYPE_XLSX == type) {try {wb = new XSSFWorkbook(is);} catch (IOException e) {LOGGER.error(e.getMessage());return null;}} else {return null;}ExcelVO excelVO = new ExcelVO();int sheetCount = wb.getNumberOfSheets();if (sheetCount == 0) {return excelVO;}List<SheetVO> sheets = new ArrayList<SheetVO>();excelVO.setSheets(sheets);// 计算公式FormulaEvaluator evaluator = wb.getCreationHelper().createFormulaEvaluator();for (int i = 0; i < sheetCount; i++) {SheetVO sheetVO = loadSheet(wb.getSheetAt(i), evaluator);if (null == sheetVO || CollectionUtils.isEmpty(sheetVO.getTitles())) {continue;}sheets.add(sheetVO);}return excelVO;}private static SheetVO loadSheet(Sheet sheet, FormulaEvaluator evaluator) {SheetVO sheetVO = new SheetVO();sheetVO.setName(sheet.getSheetName());// 总行数int rownum = sheet.getPhysicalNumberOfRows();if (rownum == 0) {return null;}// 获取第一行Row titleRow = sheet.getRow(0);// 列数int coloumNum = sheet.getRow(0).getPhysicalNumberOfCells();// 表头List<String> titles = new ArrayList<>(coloumNum);for (int i = 0; i < coloumNum; i++) {String titleStr = titleRow.getCell(i).toString().trim();// 处理特殊字符，全部替换为下划线，避免SQL报错,只保留汉字，字母，数字String patten = "[^\u4e00-\u9fa5a-zA-Z0-9]";titleStr = titleStr.replaceAll(patten, "_");if (StringUtils.isBlank(titleStr)) {throw new ServiceException("表格的第一行必须有值");}// 处理表头过长if (titleStr.length() > 40) {titleStr = titleStr.substring(0, 40);}titles.add(titleStr);}sheetVO.setTitles(titles);// 只有表头，没有数据if (rownum == 1) {return sheetVO;}// 装数据List<RowVO> datas = new ArrayList<RowVO>();for (int i = 1; i < rownum; i++) {Row dataRow = sheet.getRow(i);if (null == dataRow) {continue;}RowVO rowVO = new RowVO();datas.add(rowVO);List<CellVO> cells = new ArrayList<CellVO>();rowVO.setCells(cells);for (int j = 0; j < coloumNum; j++) {String cellStr = "";Cell cell = dataRow.getCell(j);if (null == cell) {cells.add(null);continue;}CellVO cellVO = new CellVO();int type = cell.getCellType();if (Cell.CELL_TYPE_FORMULA == type) {CellValue tempCellValue = evaluator.evaluate(cell);double iCellValue = tempCellValue.getNumberValue();cellStr = iCellValue + "";}if (Cell.CELL_TYPE_NUMERIC == type) {if (DateUtil.isCellDateFormatted(cell)) {cellVO.setDataType(CellVO.DATA_TYPE_DATE);Date date = DateUtil.getJavaDate(cell.getNumericCellValue());cellStr = DateUtils.dateToString(date);} else {cellVO.setDataType(CellVO.DATA_TYPE_NUMERIC);// 处理数字精度和科学计数法BigDecimal bd = new BigDecimal(cell.toString());cellStr = bd.toPlainString();}} else {cellVO.setDataType(CellVO.DATA_TYPE_STRING);cellStr = cell.toString();}cellVO.setValue(cellStr);cells.add(cellVO);}}sheetVO.setDatas(datas);return sheetVO;}/*** * 获取excel表头和本地数据表字段名称映射* * @param sheetVO*            sheet页* @return 映射关系 key:原始名称 value:本地存储表字段名称和数据类型*/public static Map<String, Map<String, String>> getColMapping(SheetVO sheetVO) {List<String> titles = sheetVO.getTitles();List<RowVO> datas = sheetVO.getDatas();RowVO row = null;if (CollectionUtils.isNotEmpty(datas)) {row = datas.get(0);}Map<String, Map<String, String>> map = new HashMap<String, Map<String, String>>();for (int i = 0; i < titles.size(); i++) {Map<String, String> temMap = new HashMap<>();String localCol = "col_" + i;temMap.put("name", localCol);String type = IdaConstants.DATA_TYPE_VARCHAR;if (null != row) {CellVO cell = row.getCells().get(i);if (null != cell) {int dataType = cell.getDataType();if (CellVO.DATA_TYPE_NUMERIC == dataType) {type = IdaConstants.DATA_TYPE_NUMERIC;}if (CellVO.DATA_TYPE_DATE == dataType) {type = IdaConstants.DATA_TYPE_TIMESTAMP;}}}temMap.put("type", type);map.put(titles.get(i), temMap);}return map;}
//   public static void main(String[] args) {//   File f = new File("e://安徽业绩考核综合指标2.xlsx");
//   FileInputStream fs;
//   try {//   fs = new FileInputStream(f);
//   ExcelVO excel = byte2BigExcel(IOUtils.toByteArray(fs),
//   IdaConstants.EXCEL_TYPE_XLSX);
//   Map<String,Map<String,String>> da =
//   getColMapping(excel.getSheets().get(0));
//   System.out.println();
//   } catch (Exception e) {//   // TODO Auto-generated catch block
//   e.printStackTrace();
//   }
//   }
}

ExcelVO

/** 文件名：Excel.java* 版权：Copyright by aostarit* 描述：excel对象* * 创建时间：2019年5月17日*/package com.aostar.ida.framework.util.excel;import java.util.List;import com.alibaba.fastjson.JSONObject;/*** excel 实体对象*/
public class ExcelVO {/*** sheet页*/private List<SheetVO> sheets;public List<SheetVO> getSheets() {return sheets;}public void setSheets(List<SheetVO> sheets) {this.sheets = sheets;}public String toString(){JSONObject jobj = (JSONObject)JSONObject.toJSON(this);return jobj.toJSONString();}
}

ExcelXlsReader

/** 文件名：ExcelXlsReader.java* 版权：Copyright by aostarit* 描述：处理excel2003，暂时未使用* * 创建时间：2019年5月6日*/
package com.aostar.ida.framework.util.excel;import java.io.FileInputStream;
import java.util.ArrayList;
import java.util.List;import org.apache.poi.hssf.eventusermodel.EventWorkbookBuilder;
import org.apache.poi.hssf.eventusermodel.FormatTrackingHSSFListener;
import org.apache.poi.hssf.eventusermodel.HSSFEventFactory;
import org.apache.poi.hssf.eventusermodel.HSSFListener;
import org.apache.poi.hssf.eventusermodel.HSSFRequest;
import org.apache.poi.hssf.eventusermodel.MissingRecordAwareHSSFListener;
import org.apache.poi.hssf.eventusermodel.dummyrecord.LastCellOfRowDummyRecord;
import org.apache.poi.hssf.eventusermodel.dummyrecord.MissingCellDummyRecord;
import org.apache.poi.hssf.model.HSSFFormulaParser;
import org.apache.poi.hssf.record.BOFRecord;
import org.apache.poi.hssf.record.BlankRecord;
import org.apache.poi.hssf.record.BoolErrRecord;
import org.apache.poi.hssf.record.BoundSheetRecord;
import org.apache.poi.hssf.record.FormulaRecord;
import org.apache.poi.hssf.record.LabelRecord;
import org.apache.poi.hssf.record.LabelSSTRecord;
import org.apache.poi.hssf.record.NumberRecord;
import org.apache.poi.hssf.record.Record;
import org.apache.poi.hssf.record.SSTRecord;
import org.apache.poi.hssf.record.StringRecord;
import org.apache.poi.hssf.usermodel.HSSFDataFormatter;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;/*** @author * @create 2018-01-19 14:18* @desc 用于解决.xls2003版本大数据量问题**/
public class ExcelXlsReader implements HSSFListener {private int minColums = -1;private POIFSFileSystem fs;/*** 总行数*/private int totalRows = 0;/*** 上一行row的序号*/private int lastRowNumber;/*** 上一单元格的序号*/private int lastColumnNumber;/*** 是否输出formula，还是它对应的值*/private boolean outputFormulaValues = true;/*** 用于转换formulas*/private EventWorkbookBuilder.SheetRecordCollectingListener workbookBuildingListener;// excel2003工作簿private HSSFWorkbook stubWorkbook;private SSTRecord sstRecord;private FormatTrackingHSSFListener formatListener;private final HSSFDataFormatter formatter = new HSSFDataFormatter();/*** 文件的绝对路径*/private String filePath = "";// 表索引private int sheetIndex = 0;private BoundSheetRecord[] orderedBSRs;@SuppressWarnings("unchecked")private ArrayList boundSheetRecords = new ArrayList();private int nextRow;private int nextColumn;private boolean outputNextStringRecord;// 当前行private int curRow = 0;// 存储一行记录所有单元格的容器private List<String> cellList = new ArrayList<String>();/*** 判断整行是否为空行的标记*/private boolean flag = false;@SuppressWarnings("unused")private String sheetName;/*** 遍历excel下所有的sheet** @param fileName* @throws Exception*/public int process(String fileName)throws Exception {filePath = fileName;this.fs = new POIFSFileSystem(new FileInputStream(fileName));MissingRecordAwareHSSFListener listener = new MissingRecordAwareHSSFListener(this);formatListener = new FormatTrackingHSSFListener(listener);HSSFEventFactory factory = new HSSFEventFactory();HSSFRequest request = new HSSFRequest();if (outputFormulaValues) {request.addListenerForAllRecords(formatListener);} else {workbookBuildingListener = new EventWorkbookBuilder.SheetRecordCollectingListener(formatListener);request.addListenerForAllRecords(workbookBuildingListener);}factory.processWorkbookEvents(request, fs);return totalRows; // 返回该excel文件的总行数，不包括首列和空行}/*** HSSFListener 监听方法，处理Record* 处理每个单元格* @param record*/@SuppressWarnings("unchecked")public void processRecord(Record record) {int thisRow = -1;int thisColumn = -1;String thisStr = null;String value = null;switch (record.getSid()) {case BoundSheetRecord.sid:boundSheetRecords.add(record);break;case BOFRecord.sid: // 开始处理每个sheetBOFRecord br = (BOFRecord)record;if (br.getType() == BOFRecord.TYPE_WORKSHEET) {// 如果有需要，则建立子工作簿if (workbookBuildingListener != null && stubWorkbook == null) {stubWorkbook = workbookBuildingListener.getStubHSSFWorkbook();}if (orderedBSRs == null) {orderedBSRs = BoundSheetRecord.orderByBofPosition(boundSheetRecords);}sheetName = orderedBSRs[sheetIndex].getSheetname();sheetIndex++ ;}break;case SSTRecord.sid:sstRecord = (SSTRecord)record;break;case BlankRecord.sid: // 单元格为空白BlankRecord brec = (BlankRecord)record;thisRow = brec.getRow();thisColumn = brec.getColumn();thisStr = "";cellList.add(thisColumn, thisStr);break;case BoolErrRecord.sid: // 单元格为布尔类型BoolErrRecord berec = (BoolErrRecord)record;thisRow = berec.getRow();thisColumn = berec.getColumn();thisStr = berec.getBooleanValue() + "";cellList.add(thisColumn, thisStr);checkRowIsNull(thisStr); // 如果里面某个单元格含有值，则标识该行不为空行break;case FormulaRecord.sid:// 单元格为公式类型FormulaRecord frec = (FormulaRecord)record;thisRow = frec.getRow();thisColumn = frec.getColumn();if (outputFormulaValues) {if (Double.isNaN(frec.getValue())) {outputNextStringRecord = true;nextRow = frec.getRow();nextColumn = frec.getColumn();} else {thisStr = '"' + HSSFFormulaParser.toFormulaString(stubWorkbook, frec.getParsedExpression()) + '"';}} else {thisStr = '"' + HSSFFormulaParser.toFormulaString(stubWorkbook, frec.getParsedExpression()) + '"';}cellList.add(thisColumn, thisStr);checkRowIsNull(thisStr); // 如果里面某个单元格含有值，则标识该行不为空行break;case StringRecord.sid: // 单元格中公式的字符串if (outputNextStringRecord) {StringRecord srec = (StringRecord)record;thisStr = srec.getString();thisRow = nextRow;thisColumn = nextColumn;outputNextStringRecord = false;}break;case LabelRecord.sid:LabelRecord lrec = (LabelRecord)record;curRow = thisRow = lrec.getRow();thisColumn = lrec.getColumn();value = lrec.getValue().trim();value = value.equals("") ? "" : value;cellList.add(thisColumn, value);checkRowIsNull(value); // 如果里面某个单元格含有值，则标识该行不为空行break;case LabelSSTRecord.sid: // 单元格为字符串类型LabelSSTRecord lsrec = (LabelSSTRecord)record;curRow = thisRow = lsrec.getRow();thisColumn = lsrec.getColumn();if (sstRecord == null) {cellList.add(thisColumn, "");} else {value = sstRecord.getString(lsrec.getSSTIndex()).toString().trim();value = value.equals("") ? "" : value;cellList.add(thisColumn, value);checkRowIsNull(value); // 如果里面某个单元格含有值，则标识该行不为空行}break;case NumberRecord.sid: // 单元格为数字类型NumberRecord numrec = (NumberRecord)record;curRow = thisRow = numrec.getRow();thisColumn = numrec.getColumn();// 第一种方式// value = formatListener.formatNumberDateCell(numrec).trim();//这个被写死，采用的m/d/yy h:mm格式，不符合要求// 第二种方式，参照formatNumberDateCell里面的实现方法编写Double valueDouble = ((NumberRecord)numrec).getValue();String formatString = formatListener.getFormatString(numrec);if (formatString.contains("m/d/yy")) {formatString = "yyyy-MM-dd hh:mm:ss";}int formatIndex = formatListener.getFormatIndex(numrec);value = formatter.formatRawCellContents(valueDouble, formatIndex, formatString).trim();value = value.equals("") ? "" : value;// 向容器加入列值cellList.add(thisColumn, value);checkRowIsNull(value); // 如果里面某个单元格含有值，则标识该行不为空行break;default:break;}// 遇到新行的操作if (thisRow != -1 && thisRow != lastRowNumber) {lastColumnNumber = -1;}// 空值的操作if (record instanceof MissingCellDummyRecord) {MissingCellDummyRecord mc = (MissingCellDummyRecord)record;curRow = thisRow = mc.getRow();thisColumn = mc.getColumn();cellList.add(thisColumn, "");}// 更新行和列的值if (thisRow > -1) lastRowNumber = thisRow;if (thisColumn > -1) lastColumnNumber = thisColumn;// 行结束时的操作if (record instanceof LastCellOfRowDummyRecord) {if (minColums > 0) {// 列值重新置空if (lastColumnNumber == -1) {lastColumnNumber = 0;}}lastColumnNumber = -1;if (flag && curRow != 0) { // 该行不为空行且该行不是第一行，发送（第一行为列名，不需要）// ExcelReaderUtil.sendRows(filePath, sheetName, sheetIndex, curRow + 1, cellList); //每行结束时，调用sendRows()方法totalRows++ ;}// 清空容器cellList.clear();flag = false;}}/*** 如果里面某个单元格含有值，则标识该行不为空行* @param value*/public void checkRowIsNull(String value) {if (value != null && !"".equals(value)) {flag = true;}}
}

ExcelXlsxReader

package com.aostar.ida.framework.util.excel;import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;import org.apache.commons.lang.StringUtils;
import org.apache.poi.openxml4j.exceptions.OpenXML4JException;
import org.apache.poi.openxml4j.opc.OPCPackage;
import org.apache.poi.ss.usermodel.BuiltinFormats;
import org.apache.poi.ss.usermodel.DataFormatter;
import org.apache.poi.xssf.eventusermodel.XSSFReader;
import org.apache.poi.xssf.model.SharedStringsTable;
import org.apache.poi.xssf.model.StylesTable;
import org.apache.poi.xssf.usermodel.XSSFCellStyle;
import org.apache.poi.xssf.usermodel.XSSFRichTextString;
import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.DefaultHandler;
import org.xml.sax.helpers.XMLReaderFactory;import com.aostar.ida.framework.base.exception.ServiceException;/*** 处理大的excel表*/
public class ExcelXlsxReader extends DefaultHandler {/*** 单元格中的数据可能的数据类型*/enum CellDataType {BOOL, ERROR, FORMULA, INLINESTR, SSTINDEX, NUMBER, DATE, NULL}/*** 共享字符串表*/private SharedStringsTable sst;/*** 上一次的索引值*/private String lastIndex;/*** sheet名*/private String sheetName = "";/*** 一行内cell集合*/private List<CellVO> cellList = new ArrayList<>();/*** 判断整行是否为空行的标记*/private boolean flag = false;/*** 当前行*/private int curRow = 1;/*** 当前列*/private int curCol = 0;/*** T元素标识*/private boolean isTElement;/*** 单元格数据类型，默认为字符串类型*/private CellDataType nextDataType = CellDataType.SSTINDEX;/*** 日期格式化*/private final DataFormatter formatter = new DataFormatter();/*** 单元格日期格式的索引*/private short formatIndex;/*** 日期格式字符串*/private String formatString;/*** 定义前一个元素和当前元素的位置，用来计算其中空的单元格数量，如A6和A8等*/private String preRef = null;/*** 当前元素位置*/private String ref = null;/*** 定义该文档一行最大的单元格数，用来补全一行最后可能缺失的单元格*/private String maxRef = null;/*** 单元格*/private StylesTable stylesTable;/*** 当前sheet对象*/private SheetVO curSheetVO;/*** 当前字段的数据类型*/private int curDataType;/*** 遍历工作簿中所有的电子表格* 并缓存在mySheetList中** @param bytes excel字节流* @throws IOException  异常* @throws OpenXML4JException  异常* @throws SAXException 异常* @return excel对象 */public ExcelVO process(byte[] bytes)throws IOException, OpenXML4JException, SAXException {InputStream inputStream = new ByteArrayInputStream(bytes);OPCPackage pkg = OPCPackage.open(inputStream);XSSFReader xssfReader = new XSSFReader(pkg);stylesTable = xssfReader.getStylesTable();SharedStringsTable sst = xssfReader.getSharedStringsTable();XMLReader parser = XMLReaderFactory.createXMLReader("org.apache.xerces.parsers.SAXParser");parser.setFeature("http://apache.org/xml/features/disallow-doctype-decl", true);parser.setFeature("http://xml.org/sax/features/external-general-entities", false);parser.setFeature("http://xml.org/sax/features/external-parameter-entities", false);this.sst = sst;parser.setContentHandler(this);XSSFReader.SheetIterator sheets = (XSSFReader.SheetIterator)xssfReader.getSheetsData();ExcelVO excelVO = new ExcelVO();List<SheetVO> sheetList = new ArrayList<SheetVO>();excelVO.setSheets(sheetList);while (sheets.hasNext()) { // 遍历sheetcurSheetVO = new SheetVO();List<RowVO> datas = new ArrayList<>();curSheetVO.setDatas(datas);curRow = 1; // 标记初始行为第一行InputStream sheet = sheets.next(); // sheets.next()和sheets.getSheetName()不能换位置，否则sheetName报错sheetName = sheets.getSheetName();curSheetVO.setName(sheetName);sheetList.add(curSheetVO);InputSource sheetSource = new InputSource(sheet);parser.parse(sheetSource); // 解析excel的每条记录，在这个过程中startElement()、characters()、endElement()这三个函数会依次执行sheet.close();}return excelVO; // 返回该excel文件的总行数，不包括首列和空行}/*** 第一个执行**/@Overridepublic void startElement(String uri, String localName, String name, Attributes attributes)throws SAXException {// c => 单元格if ("c".equals(name)) {//开关位置不对，则证明转换后的xml只有c为没有v   <c r="XX" s="XX"></c>  这里需要自己补齐v的数据//由于计算实际V比较困难，这里采用有C就先占位，然后有V就替换列表最后一个元素的方式来处理CellVO cellVO = new CellVO();cellVO.setValue("");cellVO.setDataType(CellVO.DATA_TYPE_STRING);cellList.add(curCol, cellVO);curCol++ ;// 前一个单元格的位置if (preRef == null) {preRef = attributes.getValue("r");} else {preRef = ref;}// 当前单元格的位置ref = attributes.getValue("r");//检查是否有空单元格需要补齐int blankCount = countNullCell(ref, preRef);if(blankCount > 0){for (int i = 0; i < blankCount; i++ ) {CellVO blankVO = new CellVO();blankVO.setValue("");blankVO.setDataType(CellVO.DATA_TYPE_STRING);cellList.add(curCol, cellVO);curCol++ ;}}// 设定单元格类型this.setNextDataType(attributes);}// 当元素为t时if ("t".equals(name)) {isTElement = true;} else {isTElement = false;}// 置空lastIndex = "";}/*** 第二个执行* 得到单元格对应的索引值或是内容值* 如果单元格类型是字符串、INLINESTR、数字、日期，lastIndex则是索引值* 如果单元格类型是布尔值、错误、公式，lastIndex则是内容值*/@Overridepublic void characters(char[] ch, int start, int length)throws SAXException {lastIndex += new String(ch, start, length);}/*** 第三个执行**/@Overridepublic void endElement(String uri, String localName, String name)throws SAXException {// t元素也包含字符串if (isTElement) {// 这个程序没经过// 将单元格内容加入rowlist中，在这之前先去掉字符串前后的空白符String value = lastIndex.trim();CellVO cellVO = new CellVO();cellVO.setValue(value);cellVO.setDataType(curDataType);cellList.set(curCol-1, cellVO);isTElement = false;// 如果里面某个单元格含有值，则标识该行不为空行if (value != null && !"".equals(value)) {flag = true;}} else if ("v".equals(name)) {// v => 单元格的值，如果单元格是字符串，则v标签的值为该字符串在SST中的索引String value = this.getDataValue(lastIndex.trim(), "");// 根据索引值获取对应的单元格值if(null != value){value = value.trim();}CellVO cellVO = new CellVO();cellVO.setValue(value);cellVO.setDataType(curDataType);cellList.set(curCol-1, cellVO);// 如果里面某个单元格含有值，则标识该行不为空行if (value != null && !"".equals(value)) {flag = true;}} else {// 如果标签名称为row，这说明已到行尾，调用optRows()方法if ("row".equals(name)) {// 默认第一行为表头，以该行单元格数目为最大数目if (curRow == 1) {maxRef = ref;// 表头List<String> titles = new ArrayList<>();for (CellVO cell : cellList) {String titleStr = cell.getValue().trim();// 处理特殊字符，全部替换为下划线，避免SQL报错,只保留汉字，字母，数字String patten = "[^\u4e00-\u9fa5a-zA-Z0-9]";titleStr = titleStr.replaceAll(patten, "_");if (StringUtils.isBlank(titleStr)) {throw new ServiceException("表格的第一行必须有值");}// 处理表头过长if (titleStr.length() > 40) {titleStr = titleStr.substring(0, 40);}titles.add(titleStr);}curSheetVO.setTitles(titles);}// 补全一行尾部可能缺失的单元格if (maxRef != null) {//检查是否有空单元格需要补齐int blankCount = countNullCell(maxRef, ref);if(blankCount >= 0){for (int i = 0; i <= blankCount; i++ ) {CellVO blankVO = new CellVO();blankVO.setValue("");blankVO.setDataType(CellVO.DATA_TYPE_STRING);cellList.add(curCol, blankVO);curCol++ ;}}}if (flag && curRow != 1) { // 该行不为空行且该行不是第一行，则发送（第一行为列名，不需要）List<RowVO> datas = curSheetVO.getDatas();RowVO rowVO = new RowVO();datas.add(rowVO);List<CellVO> cells = new ArrayList<>();rowVO.setCells(cells);for (CellVO cell : cellList) {CellVO cellVO = new CellVO();String value = cell.getValue();if(null != value){value = value.trim();}cellVO.setValue(value);cellVO.setDataType(cell.getDataType());cells.add(cellVO);}}cellList.clear();curRow++ ;curCol = 0;preRef = null;ref = null;flag = false;}}}/*** 处理数据类型** @param attributes 属性*/public void setNextDataType(Attributes attributes) {nextDataType = CellDataType.NUMBER; // cellType为空，则表示该单元格类型为数字formatIndex = -1;formatString = null;String cellType = attributes.getValue("t"); // 单元格类型String cellStyleStr = attributes.getValue("s"); //if ("b".equals(cellType)) { // 处理布尔值nextDataType = CellDataType.BOOL;} else if ("e".equals(cellType)) { // 处理错误nextDataType = CellDataType.ERROR;} else if ("inlineStr".equals(cellType)) {nextDataType = CellDataType.INLINESTR;} else if ("s".equals(cellType)) { // 处理字符串nextDataType = CellDataType.SSTINDEX;} else if ("str".equals(cellType)) {nextDataType = CellDataType.FORMULA;}if (cellStyleStr != null) { // 处理日期int styleIndex = Integer.parseInt(cellStyleStr);XSSFCellStyle style = stylesTable.getStyleAt(styleIndex);formatIndex = style.getDataFormat();formatString = style.getDataFormatString();if (formatString.contains("m/d/yy")) {nextDataType = CellDataType.DATE;formatString = "yyyy-MM-dd hh:mm:ss";}if (formatString == null) {nextDataType = CellDataType.NULL;formatString = BuiltinFormats.getBuiltinFormat(formatIndex);}}}/*** 对解析出来的数据进行类型处理* @param value   单元格的值，*                value代表解析：BOOL的为0或1， ERROR的为内容值，FORMULA的为内容值，INLINESTR的为索引值需转换为内容值，*                SSTINDEX的为索引值需转换为内容值， NUMBER为内容值，DATE为内容值* @param thisStr 一个空字符串* @return 单元格的值*/public String getDataValue(String value, String thisStr) {curDataType = CellVO.DATA_TYPE_STRING;switch (nextDataType) {// 这几个的顺序不能随便交换，交换了很可能会导致数据错误case BOOL: // 布尔值char first = value.charAt(0);thisStr = first == '0' ? "FALSE" : "TRUE";break;case ERROR: // 错误thisStr = "\"ERROR:" + value.toString() + '"';break;case FORMULA: // 公式thisStr = '"' + value.toString() + '"';break;case INLINESTR:XSSFRichTextString rtsi = new XSSFRichTextString(value.toString());thisStr = rtsi.toString();rtsi = null;break;case SSTINDEX: // 字符串String sstIndex = value.toString();try {int idx = Integer.parseInt(sstIndex);XSSFRichTextString rtss = new XSSFRichTextString(sst.getEntryAt(idx));// 根据idx索引值获取内容值thisStr = rtss.toString();rtss = null;} catch (NumberFormatException ex) {thisStr = value.toString();}break;case NUMBER: // 数字curDataType = CellVO.DATA_TYPE_NUMERIC;if (formatString != null) {thisStr = formatter.formatRawCellContents(Double.parseDouble(value), formatIndex, formatString).trim();} else {thisStr = value;}thisStr = thisStr.replace("_", "").trim();break;case DATE: // 日期curDataType = CellVO.DATA_TYPE_DATE;thisStr = formatter.formatRawCellContents(Double.parseDouble(value), formatIndex, formatString);// 对日期字符串作特殊处理，去掉TthisStr = thisStr.replace("T", " ");break;default:thisStr = " ";break;}return thisStr;}private int countNullCell(String ref, String preRef) {// excel2007最大行数是1048576，最大列数是16384，最后一列列名是XFDString xfd = ref.replaceAll("\\d+", "");String preXfd = preRef.replaceAll("\\d+", "");xfd = fillChar(xfd, 3, '@', true);preXfd = fillChar(preXfd, 3, '@', true);char[] letter = xfd.toCharArray();char[] preLetter = preXfd.toCharArray();int res = (letter[0] - preLetter[0]) * 26 * 26 + (letter[1] - preLetter[1]) * 26 + (letter[2] - preLetter[2]);return res - 1;}private String fillChar(String str, int len, char let, boolean isPre) {int strLen = str.length();if (strLen < len) {if (isPre) {for (int i = 0; i < (len - strLen); i++ ) {str = let + str;}} else {for (int i = 0; i < (len - strLen); i++ ) {str = str + let;}}}return str;}}

SheetVO

/** 文件名：SheetVO.java* 版权：Copyright by aostarit* 描述：sheet实体*/package com.aostar.ida.framework.util.excel;import java.util.List;/*** excel的sheet实体对象* * @version 2019年5月17日*/
public class SheetVO {/*** 名称*/private String name;/*** 表头列表--暂时只支持单表头，不支持跨行--约定为第一行*/private List<String> titles;/*** 数据内容--不含表头*/private List<RowVO> datas;public String getName() {return name;}public void setName(String name) {this.name = name;}public List<String> getTitles() {return titles;}public void setTitles(List<String> titles) {this.titles = titles;}public List<RowVO> getDatas() {return datas;}public void setDatas(List<RowVO> datas) {this.datas = datas;}}

RowVO

/** 文件名：RowVO.java* 版权：Copyright by aostarit* 描述：excel行*/package com.aostar.ida.framework.util.excel;import java.util.List;/*** excel行对象* * @version 2019年5月17日*/
public class RowVO {/*** 单元格数据*/private List<CellVO> cells;public List<CellVO> getCells() {return cells;}public void setCells(List<CellVO> cells) {this.cells = cells;}
}

CellVO

/** 文件名：CellVO.java* 版权：Copyright by aostarit* 描述：单元格对象*/package com.aostar.ida.framework.util.excel;
/*** 单元格实体* * @version 2019年5月17日*/
public class CellVO {/*** 数字类型*/public static final int DATA_TYPE_NUMERIC = 1;/*** 字符串类型*/public static final int DATA_TYPE_STRING = 2;/*** 日期类型*/public static final int DATA_TYPE_DATE = 3;/*** 单元格的值*/private String value;/*** 值的类型*/private int dataType;public String getValue() {return value;}public void setValue(String value) {this.value = value;}public int getDataType() {return dataType;}public void setDataType(int dataType) {this.dataType = dataType;}}

控制台

@Overridepublic MsgContext exportSheetDatas(HttpServletResponse response,Long sheetId, int currentPageNo, int pageSize) {BizIdxSheets sheetPO = idxSheetsMapper.selectByPrimaryKey(Sutil.checkData(StringUtils.EMPTY, sheetId));if (null == sheetPO) {throw new ServiceException("未找到该指标图层信息！");}IdxSqlHander idxSqlHander = SpringUtil.getBean("idxSqlHander", IdxSqlHander.class);Map<String, Object> allMap=idxSqlHander.init(sheetId).queryData(currentPageNo, pageSize);List<Map> list = (List<Map>) allMap.get("titles");for (Map map : list) {map.get("label");LOGGER.info("===map=>"+map.get("label"));}//       List<Map> listss1 = (List<Map>) allMap.get("datas");
//
//      LOGGER.info("===listss=>"+listss1);
//
//      listss1.forEach(li->{//          li.values().forEach(v->{//              LOGGER.info("=88=>"+v);
//          });
//          li.keySet().forEach(k->{//              LOGGER.info("=99=>"+k);
//          });
//      });//   ArrayList<Map<String, Object>> rows = (ArrayList<Map<String, Object>>)allMap.get("datas");// List<Map<String, Object>> compDatas = (List<Map<String, Object>>)allMap.get("datas");List<Map<String, String>> compTitles = (List<Map<String, String>>)MapUtils.getObject(allMap, "titles");List<Map<String, Object>> compDatas = (List<Map<String, Object>>)MapUtils.getObject(allMap, "datas");LOGGER.info("===compDatas=2>"+compDatas);LOGGER.info("===compTitles=2>"+compTitles);List<String> titles = new ArrayList<String>();for(Map<String, String> map : compTitles){titles.add(MapUtils.getString(map, "label"));}LOGGER.info("===titles=2>"+titles);List<List<Object>> exportDatas = new ArrayList<List<Object>>(compDatas.size());LOGGER.info("===exportDatas.size()==》"+exportDatas.size());for (int i = 0; i < compDatas.size(); i++ ) {List<Object> rowData = new ArrayList<Object>();Map<String, Object> compData = compDatas.get(i);for(String title : titles){rowData.add(MapUtils.getString(compData, title, ""));                    }exportDatas.add(rowData);}LOGGER.info("===exportDatas=2>"+exportDatas);LOGGER.info("===json=2>"+JSON.toJSONString(allMap.get("titles")));//     JSONArray  ac=JSON.parseArray(JSON.toJSONString(allMap.get("titles")));
//
//      LOGGER.info("===ac=2>"+ac);
//
//
//
//       for (int i = 0; i < ac.size(); i++) {//           Map<String, Object> map = (Map<String, Object>) ac.get(i);
//           Iterator iterator = map.keySet().iterator();
//              while (iterator.hasNext()) {//                  String string = (String) iterator.next();
//                  LOGGER.info("===map.get(string)>"+map.get(string));
//              }
//
//       }
//
//       JSONArray  ab=JSON.parseArray(JSON.toJSONString(allMap.get("datas")));
//
//
//       for (int i = 0; i < ab.size(); i++) {//           Map<String, Object> map = (Map<String, Object>) ac.get(i);
//           Iterator iterator = map.keySet().iterator();
//              while (iterator.hasNext()) {//                  String string = (String) iterator.next();
//                  LOGGER.info("===map.get(string)>"+map.get(string));
//              }
//
//       }
//      HSSFWorkbook book= ExcelUtils.data2Excel(exportDatas, titles, "sheet");//    String sceName = MapUtils.getString(allMap, "sceName");String sceName = "ExportXls";OutputStream os = null;try {os = response.getOutputStream();response.reset();// 清空输出流response.setContentType("application/x-msdownload");response.setCharacterEncoding("utf-8");response.setContentType("text/html;charset=utf-8");response.setHeader("Content-disposition", "attachment; filename="+URLEncoder.encode(sceName, "UTF-8")+".xls");// 设定输出文件头response.setContentType("application/msexcel");// 定义输出类型book.write(os);LOGGER.info("导出完成关闭流");} catch (IOException e) {return MsgContext.createErrorContext("导出失败。");} finally {IOUtils.closeQuietly(os);}return null;       }

allMap 数据类型为

allMap==>{sortColName=, datas=[{number=100, name=电工, deptID=200, ID=1}, {number=150, name=水工, deptID=300, ID=2}, {number=200, name=领导, deptID=400, ID=3}, {number=5000, name=董事长, deptID=250, ID=4}], titles=[{sign=, label=number, type=1}, {sign=, label=name, type=1}, {sign=, label=deptID, type=2}, {sign=, label=ID, type=2}], totalCount=4}

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文件上传，下载，预览，删除（File），分页接口

文件上传，下载，预览，删除（File）

1.公共参数方法

1.1公共返回类型定义

1.2 分页接口

1.3公共实体类

1.4 公共的 mapper.java/xml（都放在一起）

1.4.1 FileMapper .java

1.4.2 FileMapper .xml

1.5 Dao层

1.6 调用常理

1.7 数据库执行语句

2.0 文件上传代码（上面有公共的下面提供Controller与ServiceImpl接口）

3.0 文件查询接口代码（上面有公共的下面提供Controller与ServiceImpl接口）

4.0 文件预览/下载接口代码（上面有公共的下面提供Controller与ServiceImpl接口）

4.1 下载接口代码（上面有公共的下面提供Controller与ServiceImpl接口）

4.2 下载接口代码（上面有公共的下面提供Controller与ServiceImpl接口）

4.3 Base64转换demo

5.0 文件删除接口代码（上面有公共的下面提供Controller与ServiceImpl接口）

6.0 网上的（四种） Java下载文件的四种方式详细代码

1.以流的方式下载

2.下载本地文件

3.支持在线打开文件/下载啊的一种方式

4.0 网络url下载，并写入浏览器

7.0 导出excel(xls)

7.1工具类

ExcelUtils

ExcelVO

ExcelXlsReader

ExcelXlsxReader

SheetVO

RowVO

CellVO

控制台

文件上传，下载，预览，删除（File），分页接口相关推荐

最新文章

热门文章

文件上传，下载，预览，删除（File），分页接口

文件上传，下载，预览，删除（File）

1.公共参数方法

1.1公共返回类型定义

1.2 分页接口

1.3公共实体类

1.4 公共的 mapper.java/xml（都放在一起）

1.4.1 FileMapper .java

1.4.2 FileMapper .xml

1.5 Dao层

1.6 调用常理

1.7 数据库执行语句

2.0 文件上传代码 （上面有公共的下面提供Controller与ServiceImpl接口）

3.0 文件查询接口代码 （上面有公共的下面提供Controller与ServiceImpl接口）

4.0 文件预览/下载接口代码 （上面有公共的下面提供Controller与ServiceImpl接口）

4.1 下载接口代码 （上面有公共的下面提供Controller与ServiceImpl接口）

4.2 下载接口代码 （上面有公共的下面提供Controller与ServiceImpl接口）

4.3 Base64转换demo

5.0 文件删除接口代码 （上面有公共的下面提供Controller与ServiceImpl接口）

6.0 网上的（四种） Java下载文件的四种方式详细代码

1.以流的方式下载

2.下载本地文件

3.支持在线打开文件/下载啊的一种方式

4.0 网络url下载，并写入浏览器

7.0 导出excel(xls)

7.1工具类

ExcelUtils

ExcelVO

ExcelXlsReader

ExcelXlsxReader

SheetVO

RowVO

CellVO

控制台

文件上传，下载，预览，删除（File），分页接口相关推荐

最新文章

热门文章

2.0 文件上传代码（上面有公共的下面提供Controller与ServiceImpl接口）

3.0 文件查询接口代码（上面有公共的下面提供Controller与ServiceImpl接口）

4.0 文件预览/下载接口代码（上面有公共的下面提供Controller与ServiceImpl接口）

4.1 下载接口代码（上面有公共的下面提供Controller与ServiceImpl接口）

4.2 下载接口代码（上面有公共的下面提供Controller与ServiceImpl接口）

5.0 文件删除接口代码（上面有公共的下面提供Controller与ServiceImpl接口）