Java文件上传下载

文件上传

1. 依赖jar

<!--文件上传-->
       	<dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>1.3.1</version>
        </dependency>

2.单文件上传

 @ApiOperation(value = "单个文件上传")
    @PostMapping(value = "/simpleUpload1")
    public JSONResponse upload(@RequestParam("uploadFile") @ApiParam(value = "文件名", required = true) MultipartFile uploadFile) {
        //获取文件名
        String fileName = uploadFile.getOriginalFilename();
        fileName = fileName.substring(fileName.lastIndexOf("\\") + 1);
        //文件的上传路径
        String filePath = "D:\\upload\\" + new Date().getTime() + fileName;
        try {
            File file = new File(filePath);
            //将文件上传到指定的路径
            uploadFile.transferTo(file);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return ResultUtil.success("文件上传成功", filePath);
    }

3.多文件上传

@ApiOperation(value = "多文件上传")
    @PostMapping(value = "/UploadAll")
    public JSONResponse upload(@RequestParam("uploadFile") @ApiParam(value = "文件名", required = true) MultipartFile[] uploadFiles) {
        try {
            for (MultipartFile uploadFile : uploadFiles) {
                //此处MultipartFile[]表明是多文件,如果是单文件MultipartFile就行了
                if (uploadFile.isEmpty()) {
                    return ResultUtil.error("文件上传失败");
                } else {
                    //获取文件名
                    String fileName = uploadFile.getOriginalFilename();
                    fileName = fileName.substring(fileName.lastIndexOf("\\") + 1);
                    //文件的上传路径
                    String filePath = "D:\\upload\\" + new Date().getTime() + fileName;
                    File file = new File(filePath);
                    //将文件上传到指定的路径
                    uploadFile.transferTo(file);
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return ResultUtil.success("文件上传成功");
    }

4.文件下载

@GetMapping("xz")
    @ApiOperation(value = "文件下载")
    public ResponseEntity<byte[]> testResponseEntity(@ApiParam(value = "下载文件的路径", required = true) @RequestParam("vurl") String vurl, @ApiParam(value = "下载文件的名称", required = true) @RequestParam("vname") String vname, HttpSession session) throws IOException {

        byte[] body = null;
        ServletContext servletContext = session.getServletContext();
        ///files/abc.txt：所要下载文件的地址
        InputStream in = servletContext.getResourceAsStream(vurl);
        body = new byte[in.available()];
        in.read(body);
        HttpHeaders headers = new HttpHeaders();
        //响应头的名字和响应头的值
        vname = vname + ".jpg";
        headers.add("Content-Disposition", "attachment;filename=" + vname + "");

        HttpStatus statusCode = HttpStatus.OK;

        ResponseEntity<byte[]> response = new ResponseEntity<byte[]>(body, headers, statusCode);
        return response;
    }