Java从服务端下载Excel模板文件
2024-06-13 23:43:33
方法一 （2021年01月更新）
生成excel模板
@RequestMapping("/downloadExcel")public void downloadExcel(HttpServletResponse response, HttpServletRequest request) {String [] excelHeader = {"姓名","手机号（必填）","渠道名","产品名","手机操作系统（IOS/安卓)","是否是XX数据"};List<Object> list = new ArrayList<>();Object[] obj1 = {"张三","173*****311","a1","A","IOS","是"};Object[] obj2 = {"李四","138*****742","a2","B","安卓","否"};list.add(obj1);list.add(obj2);FileExport.exportExcel(excelHeader, list, "XXX模板", response, request);}
FileExport工具类：
package com.abc.common.utils.file;import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
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.ss.usermodel.BorderStyle;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.HorizontalAlignment;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import java.util.Map;/*** 文件导出工具* @author abc* @date 2019/01/08*/
public class FileExport {private static final Logger logger = LoggerFactory.getLogger(FileExport.class);/** CSV文件列分隔符 */private static final String CSV_COLUMN_SEPARATOR = ",";private static final String CSV_COLUM_TABLE = "\t";/** CSV文件列分隔符 */private static final String CSV_RN = "\r\n";/*** 导出Excel文件* * @param excelHeader* 导出文件中表格头* @param list* 导出的内容* @param response* HttpServletResponse对象，用来获得输出流向客户端写导出的文件* @param sheetName* Excel的sheet名称，加上时间戳作为导出文件的名称*/public static void exportExcel(String [] excelHeader, List<Object> list, String sheetName, HttpServletResponse response, HttpServletRequest request) {HSSFWorkbook wb = new HSSFWorkbook();HSSFSheet sheet = wb.createSheet(sheetName);HSSFRow row = sheet.createRow((int) 0);/******设置单元格是否显示网格线******/sheet.setDisplayGridlines(false);/******设置头单元格样式******/HSSFCellStyle style = wb.createCellStyle();style.setAlignment(HorizontalAlignment.CENTER);Font fontHeader = wb.createFont();fontHeader.setBold(true);fontHeader.setFontHeight((short) 240);style.setFont(fontHeader);style.setBorderBottom(BorderStyle.THIN);style.setBorderLeft(BorderStyle.THIN);style.setBorderRight(BorderStyle.THIN);style.setBorderTop(BorderStyle.THIN);/******设置头内容******/for (int i = 0; i < excelHeader.length; i++) {HSSFCell cell = row.createCell(i);cell.setCellValue(" " +excelHeader[i] + " ");cell.setCellStyle(style); } /******设置内容单元格样式******/HSSFCellStyle styleCell = wb.createCellStyle();Font fontCell = wb.createFont();fontCell.setColor(HSSFColor.BLACK.index);styleCell.setAlignment(HorizontalAlignment.CENTER);styleCell.setFont(fontCell);styleCell.setBorderBottom(BorderStyle.THIN);styleCell.setBorderLeft(BorderStyle.THIN);styleCell.setBorderRight(BorderStyle.THIN);styleCell.setBorderTop(BorderStyle.THIN);/******设置单元格内容******/for (int i = 0; i < list.size(); i++) {row = sheet.createRow(i + 1);/******设置行高******/row.setHeightInPoints(20);Object[] obj = (Object[]) list.get(i); for (int j = 0; j < excelHeader.length; j++) {styleCell.setWrapText(false);HSSFCell cell = row.createCell(j);if (obj[j] != null){cell.setCellValue(obj[j].toString());}else{cell.setCellValue(""); } //if(obj[j].toString().length()>20)// styleCell.setWrapText(true);cell.setCellStyle(styleCell);sheet.autoSizeColumn(j);} } OutputStream ouputStream = null;try {String encoding = "UTF-8";/** 获取浏览器相关的信息 */String userAgent = request.getHeader("user-agent");/** 判断是否为msie浏览器 */if (userAgent.toLowerCase().indexOf("msie") != -1){encoding = "gbk";}response.setCharacterEncoding(encoding);response.setContentType("application/vnd.ms-excel"); String fileName = sheetName;SimpleDateFormat dateFormat = new SimpleDateFormat("yyyyMMddHHMMSS");fileName += (dateFormat.format(new Date())).toString()+".xls";response.setHeader("Content-disposition", "attachment;filename=" + URLEncoder.encode(fileName, encoding));ouputStream = response.getOutputStream(); wb.write(ouputStream); ouputStream.flush(); } catch (Exception e) {e.printStackTrace();} finally {try {if(ouputStream!=null) {ouputStream.close();}} catch (IOException e) {e.printStackTrace();}}}/*** 导出CSV文件* @param dataList 集合数据* @param colNames 表头部数据* @param mapKey 查找的对应数据*/public static boolean doExport(List<Map<String, Object>> dataList, String colNames, String mapKey, OutputStream os) {try {StringBuffer buf = new StringBuffer();String[] colNamesArr = null;String[] mapKeyArr = null;colNamesArr = colNames.split(",");mapKeyArr = mapKey.split(",");/******完成数据csv文件的封装******//******输出列头******/for (int i = 0; i < colNamesArr.length; i++) {buf.append(colNamesArr[i]).append(CSV_COLUMN_SEPARATOR);}buf.append(CSV_RN);if (null != dataList) {/******输出数据******/for (int i = 0; i < dataList.size(); i++) {for (int j = 0; j < mapKeyArr.length; j++) {buf.append(dataList.get(i).get(mapKeyArr[j])).append(CSV_COLUM_TABLE).append(CSV_COLUMN_SEPARATOR);}buf.append(CSV_RN);}}/******写出响应******/os.write(buf.toString().getBytes("GBK"));os.flush();return true;} catch (Exception e) {logger.error("doExport错误...", e);}return false;}/*** 设置响应格式* @param fileName* @param response* @throws UnsupportedEncodingException*/public static void responseSetProperties(String fileName, HttpServletResponse response) throws UnsupportedEncodingException {/******设置文件后缀******/SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");String fn = fileName + sdf.format(new Date()).toString() + ".csv";/******读取字符编码******/String utf = "UTF-8";/******设置响应******/response.setContentType("application/ms-txt.numberformat:@");response.setCharacterEncoding(utf);response.setHeader("Pragma", "public");response.setHeader("Cache-Control", "max-age=30");response.setHeader("Content-Disposition", "attachment; filename=" + URLEncoder.encode(fn, utf));}
}
导出CSV文件
@GetMapping("/exportFailureRecord")public void exportFailureRecord(String batchNumber, HttpServletResponse response) {if (StringUtils.isBlank(batchNumber)) {log.warn("失败记录导出失败，批次号为空...");return;}//这里根据你的业务查询出数据List<ImportFailureRecord> list = importFailureRecordService.selectList(new EntityWrapper<ImportFailureRecord>().eq("is_delete", 0).eq("batch_number", batchNumber));if (CollectionUtil.isEmpty(list)) {log.warn("未查询到可导出的数据...");return;}log.info("===========查询到{}条可导出数据==============", list.size());String sTitle = "用户姓名,手机号,失败原因";String fName = "xxx失败记录数据_";String mapKey = "userName,userPhone,failureReason";List<Map<String, Object>> dataList = new ArrayList<>();for (ImportFailureRecord data : list) {Map<String, Object> map = new HashMap<>();map.put("userName", data.getUserName() == null ? "" : data.getUserName());map.put("userPhone", data.getUserPhone() == null ? "" : data.getUserPhone());map.put("failureReason", data.getFailureReason() == null ? "" : data.getFailureReason());dataList.add(map);}try (final OutputStream os = response.getOutputStream()) {log.info("=============失败记录导出开始============");FileExport.responseSetProperties(fName, response);FileExport.doExport(dataList, sTitle, mapKey, os);log.info("=============失败记录导出结束============");} catch (Exception e) {log.error("导出失败记录数据失败", e);}}
方法二
/*** 描述：下载外部案件导入模板* @param response* @param request* @author songfayuan* 2018年6月7日下午5:03:59*/@RequestMapping("/downloadExcel")@ResponseBodypublic void downloadExcel(HttpServletResponse response,HttpServletRequest request) {//方法一：直接下载路径下的文件模板（这种方式貌似在SpringCloud和Springboot中，打包成JAR包时，无法读取到指定路径下面的文件，不知道记错没，你们可以自己尝试下！！！）try {//获取要下载的模板名称String fileName = "ApplicationImportTemplate.xlsx";//设置要下载的文件的名称response.setHeader("Content-disposition", "attachment;fileName=" + fileName);//通知客服文件的MIME类型response.setContentType("application/vnd.ms-excel;charset=UTF-8");//获取文件的路径String filePath = getClass().getResource("/template/" + fileName).getPath();FileInputStream input = new FileInputStream(filePath);OutputStream out = response.getOutputStream();byte[] b = new byte[2048];int len;while ((len = input.read(b)) != -1) {out.write(b, 0, len);}//修正 Excel在“xxx.xlsx”中发现不可读取的内容。是否恢复此工作薄的内容？如果信任此工作簿的来源，请点击"是"response.setHeader("Content-Length", String.valueOf(input.getChannel().size()));input.close();//return Response.ok("应用导入模板下载完成");} catch (Exception ex) {logger.error("getApplicationTemplate :", ex);//return Response.ok("应用导入模板下载失败！");}//方法二：可以采用POI导出excel，但是比较麻烦（这里类似方法一）/*try {Workbook workbook = new HSSFWorkbook();request.setCharacterEncoding("UTF-8");response.setCharacterEncoding("UTF-8");response.setContentType("application/x-download");String filedisplay = "导入模板.xls";filedisplay = URLEncoder.encode(filedisplay, "UTF-8");response.addHeader("Content-Disposition", "attachment;filename="+ filedisplay);// 第二步，在webbook中添加一个sheet,对应Excel文件中的sheet Sheet sheet = workbook.createSheet("导入模板");// 第三步，在sheet中添加表头第0行Row row = sheet.createRow(0);// 第四步，创建单元格，并设置值表头 设置表头居中 CellStyle style = workbook.createCellStyle(); style.setAlignment(CellStyle.ALIGN_CENTER); // 创建一个居中格式 Cell cell = row.createCell(0); cell.setCellValue("商品名称"); cell.setCellStyle(style); sheet.setColumnWidth(0, (25 * 256)); //设置列宽，50个字符宽cell = row.createCell(1); cell.setCellValue("商品编码"); cell.setCellStyle(style); sheet.setColumnWidth(1, (20 * 256)); //设置列宽，50个字符宽cell = row.createCell(2); cell.setCellValue("商品价格"); cell.setCellStyle(style); sheet.setColumnWidth(2, (15 * 256)); //设置列宽，50个字符宽cell = row.createCell(3); cell.setCellValue("商品规格"); cell.setCellStyle(style); sheet.setColumnWidth(3, (15 * 256)); //设置列宽，50个字符宽// 第五步，写入实体数据 实际应用中这些数据从数据库得到row = sheet.createRow(1);row.createCell(0, Cell.CELL_TYPE_STRING).setCellValue(1); row.createCell(1, Cell.CELL_TYPE_STRING).setCellValue(2); row.createCell(2, Cell.CELL_TYPE_STRING).setCellValue(3); //商品价格row.createCell(3, Cell.CELL_TYPE_STRING).setCellValue(4); //规格// 第六步，将文件存到指定位置 try { OutputStream out = response.getOutputStream();workbook.write(out);out.close(); } catch (Exception e) { e.printStackTrace(); } } catch (Exception e) {e.printStackTrace();}*/}
模板位置：
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