Spring MVC实现文件上传下载

￡神魔★判官ぃ 2022-07-17 23:29 134阅读 0赞

直接上代码

该配置的还需要spring容器配置好.例如上传的组件..

下载

public void downLoadFile(HttpServletResponse response, File file) {
            if (file == null || !file.exists()) {
                return;
            }
            OutputStream out = null;
            try {
                response.reset();
                response.setContentType("application/octet-stream; charset=utf-8");
                response.setHeader("Content-Disposition", "attachment; filename=" + file.getName());
                out = response.getOutputStream();
                out.write(FileUtils.readFileToByteArray(file));
                out.flush();
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                if (out != null) {
                    try {
                        out.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
        }

下载的另一种方法

@RequestMapping("/download")
        public ResponseEntity<byte[]> download(Integer bid, HttpServletRequest httpServletRequest,
                                               HttpServletResponse response) throws IOException {
            response.setContentType("text/html;charset=UTF-8");
            if(bid==null){
                response.getWriter().print("下载的文件不存在..");
            }
            Download download= downloadService.selectByBid(bid);
    
            if(download==null){
                response.getWriter().print("下载的文件不存在..");
                return null;
            }
            File file=new File(httpServletRequest.getRealPath("/")+download.getFileurl());
            if(file.exists()==false){
                response.getWriter().print("下载的文件不存在..");
            }
            HttpHeaders headers = new HttpHeaders();
            String fileName=new String((download.getDownbook()+".pdf").getBytes("UTF-8"),"iso-8859-1");//为了解决中文名称乱码问题
            response.setContentType("multipart/form-data");
            response.setHeader("Content-Disposition", "attachment;fileName="
                    + fileName);
           // headers.setContentDispositionFormData("attachment", fileName);
            headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
            return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file),
                    headers, HttpStatus.CREATED);
        }

上传(多文件)

@RequestMapping("/upload.do")
        public String upload(HttpServletRequest request,
                HttpServletResponse response) throws IOException {
                   // 这里我用到了jar包
            CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(
                    request.getSession().getServletContext());
            if (multipartResolver.isMultipart(request)) {
                MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest) request;
    
                Iterator<String> iter = multiRequest.getFileNames();
                while (iter.hasNext()) {
                    MultipartFile file = multiRequest.getFile((String) iter.next());
                    if (file != null) {
                        String fileName = file.getOriginalFilename();
    
                        String path1 = Thread.currentThread()
                                .getContextClassLoader().getResource("").getPath()
                                + "download" + File.separator;
    
                        // 下面的加的日期是为了防止上传的名字一样
                        String path = path1
                                + new SimpleDateFormat("yyyyMMddHHmmss")
                                        .format(new Date()) + fileName;
    
                        File localFile = new File(path);
    
                        file.transferTo(localFile);
                    }
    
                }
    
            }
            return "uploadSuccess";
    
        }