下載文件①
下載文件需要將byte數組還原成文件。
首先使用mybatis將數據庫中的byte數組查出來，指定文件名(包括格式)。然后使用OutputStream將文件輸入
- @RequestMapping(value = "downPhotoById")
- public void downPhotoByStudentId(String id, final HttpServletResponse response){
- PhotoEntity entity = this.photoMapper.getPhotoEntityByPhotoId(id);
- byte[] data = entity.getPhotoData();
- String fileName = entity.getFileName()== null ? "照片.png" : entity.getFileName();
- fileName = URLEncoder.encode(fileName, "UTF-8");
- response.reset();
- response.setHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\"");
- response.addHeader("Content-Length", "" + data.length);
- response.setContentType("application/octet-stream;charset=UTF-8");
- OutputStream outputStream = new BufferedOutputStream(response.getOutputStream());
- outputStream.write(data);
- outputStream.flush();
- outputStream.close();
- }
- <a href="<%=request.getContextPath() %>/downPhotoById.do?id=8000001">下載照片</a>
下載文件②
/** * @Description 下載文件
* @author jxldjsn
* @date 2015年12月11日 下午6:11:33
* @param fileName
* @param file
* @return
* @throws IOException
*/
public ResponseEntity<byte[]> download(String fileName, File file) throws IOException {
String dfileName = new String(fileName.getBytes("gb2312"), "iso8859-1");
HttpHeaders headers = new HttpHeaders(); headers.setContentType(MediaType.APPLICATION_OCTET_STREAM); headers.setContentDispositionFormData("attachment", dfileName);
return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file), headers, HttpStatus.CREATED); }
下載文件③
//文件下載 主要方法
public static void download(HttpServletRequest request, HttpServletResponse response, String storeName, String contentType ) throws Exception { request.setCharacterEncoding("UTF-8"); BufferedInputStream bis = null; BufferedOutputStream bos = null; //獲取項目根目錄 String ctxPath = request.getSession().getServletContext() .getRealPath(""); //獲取下載文件露肩 String downLoadPath = ctxPath+"/uploadFile/"+ storeName; //獲取文件的長度 long fileLength = new File(downLoadPath).length(); //設置文件輸出類型 response.setContentType("application/octet-stream"); response.setHeader("Content-disposition", "attachment; filename=" + new String(storeName.getBytes("utf-8"), "ISO8859-1")); //設置輸出長度 response.setHeader("Content-Length", String.valueOf(fileLength)); //獲取輸入流 bis = new BufferedInputStream(new FileInputStream(downLoadPath)); //輸出流 bos = new BufferedOutputStream(response.getOutputStream()); byte[] buff = new byte[2048]; int bytesRead; while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) { bos.write(buff, 0, bytesRead); } //關閉流 bis.close(); bos.close(); } }
下載直接訪問控制器如：http:\\localhost:8080/springmvc/download.do
下載文件④
- @RequestMapping("/export")
- public ResponseEntity<byte[]> export() throws IOException {
- HttpHeaders headers = new HttpHeaders();
- headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
- headers.setContentDispositionFormData("attachment", "dict.txt");
- return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(new File("C:/Users/Administrator/Desktop/a.txt")),
- headers, HttpStatus.CREATED);
- }