單文件下載

//下載單個文件public void downloadFile(HttpServletResponse response){ String path = 'D:testce1.txt' File file = new File(path); if(file.exists()){ String fileName = file.getName(); response.setHeader('Content-Disposition', 'attachment;fileName=' + fileName); download(response,file); } }public void download(HttpServletResponse response,File file){ FileInputStream fis = null; BufferedInputStream bis = null; OutputStream os = null; try { os = response.getOutputStream(); fis = new FileInputStream(file); bis = new BufferedInputStream(fis); byte[] buffer = new byte[bis.available()]; int i = bis.read(buffer); while(i != -1){os.write(buffer, 0, i);i = bis.read(buffer); } } catch (Exception e) { e.printStackTrace(); } try { bis.close(); fis.close(); os.close(); } catch (IOException e) { e.printStackTrace(); } }

多文件壓縮下載

//多個文件，壓縮成zip后下載public void downloadMoreFile(HttpServletResponse response) {String test1= 'D:testce1.txt'; String test2= 'D:testce2.txt'; File tfile= new File(test1); File cfile= new File(test2); List<File> files = new ArrayList<>(); files.add(tfile); files.add(cfile); if (tfile.exists() && cfile.exists()) { String zipTmp = 'D:testce1.zip'; zipd(zipTmp,files,response); } }public void zipd(String zipTmp,List<File> files,HttpServletResponse response){ File zipTmpFile = new File(zipTmp); try { if (zipTmpFile.exists()) {zipTmpFile.delete(); } zipTmpFile.createNewFile(); response.reset(); // 創建文件輸出流 FileOutputStream fous = new FileOutputStream(zipTmpFile); ZipOutputStream zipOut = new ZipOutputStream(fous); zipFile(files, zipOut); zipOut.close(); fous.close(); downloadZip(zipTmpFile, response); } catch (IOException e) { e.printStackTrace(); } } //files打成壓縮包 public void zipFile(List files, ZipOutputStream outputStream) { int size = files.size(); for (int i = 0; i < size; i++) { File file = (File) files.get(i); zipFile(file, outputStream); } } public void zipFile(File inputFile, ZipOutputStream ouputStream) { try { if (inputFile.exists()) {if (inputFile.isFile()) { FileInputStream IN = new FileInputStream(inputFile); BufferedInputStream bins = new BufferedInputStream(IN, 512); ZipEntry entry = new ZipEntry(inputFile.getName()); ouputStream.putNextEntry(entry); int nNumber; byte[] buffer = new byte[512]; while ((nNumber = bins.read(buffer)) != -1) { ouputStream.write(buffer, 0, nNumber); } bins.close(); IN.close();} else { try { File[] files = inputFile.listFiles(); for (int i = 0; i < files.length; i++) { zipFile(files[i], ouputStream); } } catch (Exception e) { e.printStackTrace(); }} } } catch (Exception e) { e.printStackTrace(); } }public static HttpServletResponse downloadZip(File file, HttpServletResponse response) { if (file.exists() == false) { System.out.println('待壓縮的文件目錄：' + file + '不存在.'); } else { try {// 以流的形式下載文件。InputStream fis = new BufferedInputStream(new FileInputStream(file.getPath()));byte[] buffer = new byte[fis.available()];fis.read(buffer);fis.close();// 清空responseresponse.reset();OutputStream toClient = new BufferedOutputStream(response.getOutputStream());response.setContentType('application/octet-stream');// 如果輸出的是中文名的文件，在此處就要用URLEncoder.encode方法進行處理response.setHeader('Content-Disposition', 'attachment;filename=' + new String(file.getName().getBytes('GB2312'), 'ISO8859-1'));toClient.write(buffer);toClient.flush();toClient.close(); } catch (Exception ex) {ex.printStackTrace(); } finally {try { File f = new File(file.getPath()); f.delete();} catch (Exception e) { e.printStackTrace();} } } return response; }

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