JAVA 文件上传下载工具类

JAVA 文件上传下载工具类

import lombok.extern.slf4j.Slf4j;
import org.apache.commons.io.FileUtils;
import org.springframework.core.io.ClassPathResource;
import org.springframework.web.multipart.MultipartFile;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;
import java.util.List;
import java.util.Objects;
import java.util.UUID;/**
* 文件操作工具类
* @date  2020/8/4 - 14:20
*/
@Slf4j
public class FileUtil extends FileUtils{/*** 读取服务器相对路径下的文件并下载* @param request 请求* @param response 响应* @param srcPath 源文件路径* @param targetName 响应文件名称* @param delSrcFile 是否删除源文件* @since 2020/8/4 14:00* @author liudongxin*/public static void downloadFile(HttpServletRequest request, HttpServletResponse response, String srcPath, String targetName,boolean delSrcFile) {try {// 读取源文件File file = readLocalFile(uploadPath + srcPath);if(StringUtils.isNotNull(file)){//文件不存在if (!file.exists() || file.isDirectory()) {log.error("要下载的文件不存在!");throw new CustomException("对不起！您要下载的文件不存在！");}//设置响应类型并下载download(request,response,file,targetName);//删除源文件if(delSrcFile){if(!file.delete()){throw new CustomException("下载文件，删除源文件失败！");}}}else {log.error("资源不存在或路径不正确");throw new CustomException("对不起！您要下载的资源不存在！");}} catch (Exception ex) {log.error(CustomException.getExceptionDetail(ex));throw new CustomException("下载资源出错了！");}}/*** 读取本工程类路径下的文件并下载* @param request 请求* @param response 响应* @param srcPath 源文件路径* @param targetName 响应文件名称* @param delSrcFile 是否删除源文件* @since 2020/8/4 14:00*/public static void downloadResFile(HttpServletRequest request, HttpServletResponse response, String srcPath, String targetName, boolean delSrcFile) {try {// 读取源文件ClassPathResource classPathResource = readLocalResFile(srcPath);if(StringUtils.isNotNull(classPathResource)){//文件不存在if (!classPathResource.getFile().exists() || classPathResource.getFile().isDirectory()) {log.error("要下载的文件不存在!");throw new CustomException("对不起！您要下载的文件不存在！");}//设置响应类型并下载download(request,response,classPathResource.getFile(),targetName);//删除源文件if(delSrcFile){if(!classPathResource.getFile().delete()){throw new CustomException("下载文件，删除源文件失败！");}}}else {log.error("资源不存在或路径不正确");throw new CustomException("对不起！您要下载的资源不存在！");}} catch (Exception ex) {log.error(CustomException.getExceptionDetail(ex));throw new CustomException("下载资源出错了！");}}/*** @param request 请求* @param response 响应* @param file 要下载的文件* @param targetName 响应文件名称*/private static void download(HttpServletRequest request, HttpServletResponse response, File file, String targetName) {//输入流FileInputStream in = null;//输出流OutputStream out = null;try {//读取文件in = new FileInputStream(file);//设置响应类型String strContentType = getFileContentType(getExt(targetName));response.reset();//重置响应response.setContentType(strContentType);//获得输出流out = response.getOutputStream();//设置编码格式if (request.getHeader("User-Agent").toUpperCase().indexOf("MSIE") > 0) {targetName = URLEncoder.encode(targetName, StandardCharsets.UTF_8.displayName());} else {targetName = new String(targetName.getBytes(StandardCharsets.UTF_8), StandardCharsets.ISO_8859_1);}//设置响应头response.setHeader("Content-Disposition", "attachment;filename="+targetName);response.setHeader("Pragma", "No-cache");response.setHeader("Cache-Control", "No-cache");response.setDateHeader("Expires", 0);//设置显示响应文件大小response.setContentLength(in.available());byte[] buf = new byte[1024];int len;while((len = in.read(buf)) != -1){//输出响应out.write(buf, 0, len);}}catch (Exception e){log.error(CustomException.getExceptionDetail(e));throw new CustomException("下载资源出错了！");}finally {try {if(out != null){out.flush();out.close();}if(in != null){in.close();}} catch (IOException e) {log.error(CustomException.getExceptionDetail(e));}}}/*** 读取服务器相对路径下的文件* @since 2020/8/4 14:30*/public static File readLocalFile(String resourcePath) {File file = new File(resourcePath);//文件存在if(file.exists()) {return file;}else {if(file.isDirectory()){//不存在创建文件夹if(!file.mkdirs()){throw new CustomException(resourcePath + " 文件夹不存在，主动创建失败！");}return file;}return null;}}/*** 读取本工程内类路径下的文件* @since 2020/8/4 14:30*/public static ClassPathResource readLocalResFile(String resourcePath) {ClassPathResource classPathResource = new ClassPathResource(resourcePath);//文件存在if(classPathResource.exists()) {return classPathResource;}return null;}/*** 单文件上传,指定路径 0文件为空  1成功  2异常* @since 2020/8/4 14:50*/public static int saveSingleFile(File file,String targetDirectory) {try {//判断文件夹是否存在，不存在则创建File filePath = checkAndCreateFile(targetDirectory);if (file != null) {String realName = UUID.randomUUID().toString()+ getExt(file.getName());File target = new File(filePath, realName);FileUtils.copyFile(file, target);return 1;}return 0;} catch (Exception e) {log.error(e.getMessage());}return 2;}/*** 单文件上传 0文件为空  1成功  2异常* @since 2020/8/4 14:53*/public static int saveSingleFile(File file) {try {//判断文件夹是否存在，不存在则创建File filePath = checkAndCreateFile();if (file != null) {String realName = UUID.randomUUID().toString() + getExt(file.getName());File target = new File(filePath, realName);FileUtils.copyFile(file, target);return 1;}return 0;} catch (Exception e) {log.error(e.getMessage());}return 2;}/*** 单文件上传 0文件为空  1成功  2异常* @since 2020/8/4 15:00*/public static File saveFile(File file) {try {//判断文件夹是否存在，不存在则创建File filePath = checkAndCreateFile();String realName = UUID.randomUUID().toString() + getExt(file.getName());File target = new File(filePath, realName);FileUtils.copyFile(file, target);return target;} catch (Exception e) {log.error(e.getMessage());}return null;}/*** 多文件上传，指定路径 0文件为空  1成功  2异常* @since 2020/8/4 15:05*/public static int saveFile(List<File> files,String targetDirectory) {try {//判断文件夹是否存在，不存在则创建File filePath = checkAndCreateFile(targetDirectory);if (files != null) {for (File file : files) {String realName = UUID.randomUUID().toString() + getExt(file.getName());File target = new File(filePath, realName);FileUtils.copyFile(file, target);}return 1;}return 0;} catch (Exception e) {log.error(e.getMessage());}return 2;}/*** 多文件上传  0文件为空  1成功  2异常* @since 2020/8/4 15:11*/public static int saveFile(List<File> files) {try {//判断文件夹是否存在，不存在则创建File filePath = checkAndCreateFile();if (files != null) {for (File file : files) {String realName = UUID.randomUUID().toString() + getExt(file.getName());File target = new File(filePath.getPath(), realName);FileUtils.copyFile(file, target);}return 1;}return 0;} catch (Exception e) {log.error(e.getMessage());}return 2;}/*** MultipartFile 转 File并存储到指定路径* @param multipartFile 需要转换的文件* @param targetPath 转换过后的文件存放的路径* @since 2020/9/4 15:14*/public static File multipartFileToFile(MultipartFile multipartFile,String targetPath) throws Exception {File newFile = new File(targetPath);//开始转换FileUtils.copyInputStreamToFile(multipartFile.getInputStream(), newFile);return newFile;}/*** MultipartFile 转 File并存储到默认路径* @author liudongxin* @since 2020/8/4 15:54*/public static File multipartFileToFile(MultipartFile file) throws Exception {//判断文件夹是否存在，不存在则创建File filePath = checkAndCreateFile();//转换后的文件File toFile = null;//文件不为空，进行转换if(null != file  && file.getSize() > 0){InputStream ins =  file.getInputStream();toFile = new File(filePath, Objects.requireNonNull(file.getOriginalFilename()));toFile = inputStreamToFile(ins, toFile);ins.close();}return toFile;}/*** MultipartFile 转 File，具体转换方法* @since 2020/8/4 15:55*/private static File inputStreamToFile(InputStream ins, File file) {OutputStream os = null;try {os = new FileOutputStream(file);int bytesRead;byte[] buffer = new byte[4096];while ((bytesRead = ins.read(buffer, 0, 4096)) != -1) {os.write(buffer, 0, bytesRead);}return file;} catch (Exception e) {log.error(e.getMessage());}finally {try {if(os != null){os.close();}if(ins != null){ins.close();}} catch (IOException e) {log.error(e.getMessage());}}return null;}/*** 判断文件夹是否存在，不存在则创建*/private static File checkAndCreateFile(String targetDirectory) {File filePath = new File(targetDirectory);//文件夹不存在if(!filePath.exists()){//创建if(!filePath.mkdir()){log.error("创建文件夹: "+ filePath.getName() +" 失败");throw new CustomException("创建文件夹: "+ filePath.getName() +" 失败");}}return filePath;}/*** 判断文件夹是否存在，不存在则创建*/private static File checkAndCreateFile() {File filePath = new File(uploadPath);//文件夹不存在if(!filePath.exists()){//创建if(!filePath.mkdir()){log.error("创建文件夹: "+ filePath.getName() +" 失败");throw new CustomException("创建文件夹: "+ filePath.getName() +" 失败");}}return filePath;}/*** 截取文件名除去扩展名* @date 2020/8/4 16:11*/public static String getPrefix(String fileName) {return fileName.substring(0,fileName.lastIndexOf(".")).toLowerCase();}/*** 截取文件扩展名* @since 2020/8/4 16:11* @author liudongxin*/public static String getExt(String fileName) {return fileName.substring(fileName.lastIndexOf(".")).toLowerCase();}/*** 设根据文件类型置响应类型* @since 2020/8/4 16:11*/private static String getFileContentType(String strFileExt) {String strContentType;if ((strFileExt == null) || ((strFileExt = strFileExt.trim().toLowerCase()).length() == 0)) {strContentType = "text/plain";return  strContentType;}switch (strFileExt){case ".sql":strContentType = "text/txt";break;case ".html":case ".htm":strContentType = "text/html";break;case ".xml":case ".xsl":strContentType = "text/xml";break;case ".zip":strContentType = "application/zip";break;case ".exe":strContentType = "application/exec";break;case ".gif":strContentType = "image/gif";break;case ".jpe":case ".jpeg":case ".jpg":strContentType = "image/jpeg";break;case ".pdf":strContentType = "application/pdf";break;case ".doc":case ".rtf":strContentType = "application/msword";break;case ".ppt":strContentType = "application/vnd.ms-powerpoint";break;case ".xls":case ".xlsx":strContentType = "application/vnd.ms-excel";break;case ".ceb":strContentType = "application/x-ceb";break;case ".ftl":strContentType = "application/force-download";break;default:strContentType = "application/octet-stream";break;}return strContentType;}}

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