下载文件①
下载文件需要将byte数组还原成文件。
首先使用mybatis将数据库中的byte数组查出来，指定文件名(包括格式)。然后使用OutputStream将文件输入
- @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">下载照片</a>
下载文件②
/** * @Description 下载文件
* @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); }
下载文件③
//文件下载 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;
//获取项目根目录
String ctxPath = request.getSession().getServletContext()
.getRealPath("");
//获取下载文件露肩
String downLoadPath = ctxPath+"/uploadFile/"+ storeName;
//获取文件的长度
long fileLength = new File(downLoadPath).length();
//设置文件输出类型
response.setContentType("application/octet-stream");
response.setHeader("Content-disposition", "attachment; filename="
+ new String(storeName.getBytes("utf-8"), "ISO8859-1"));
//设置输出长度
response.setHeader("Content-Length", String.valueOf(fileLength));
//获取输入流
bis = new BufferedInputStream(new FileInputStream(downLoadPath));
//输出流
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);
}
//关闭流
bis.close();
bos.close();
}
}
下载直接访问控制器如：http:\localhost:8080/springmvc/download.do
下载文件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);
- }