springboot upload and download files

Configure related content in yml

spring:
  #404
  mvc:
    throw-exception-if-no-handler-found: true
    #static resources
    static-path-pattern: /**
  resources:
    #static resources
    static-locations: file:${img.location}

When we configure 404 exceptions, the configuration added should be turned off (that is to say, if you want to use static resources, you must give up the unified capture of 404 exceptions. The solution is: http://blog.springcloud.cn/sc/wk2/)

spring:
  #404
  mvc:
    throw-exception-if-no-handler-found: true
  resources:
    add-mappings: false

upload files:

 front end:

<form enctype="multipart/form-data" id="uploadForm">
    <input type="file" name="uploadFile" id="upload_file" style="margin-bottom:10px;">
    <input type="button" id="uploadPicButton" value="上传" onclick="uploadImage()">
</form>


var pic = $ ( ' #upload_file ' ) [ 0 ] .files [ 0 ];
        var fd = new FormData ();
        var data = {
            header:{
                token:"1212",
                reqOrg:"1212"
            },
            body :{
                spaceClassId:1
            }
        }
        //fd.append('uploadFile', pic);
        fd.append('file', pic);
        fd.append( ' data ' , JSON.stringify(data)); //This maintains a restful form
        $.ajax({
            url:'/resources/insertResources',
            type:"post",
            // Form数据
            data: fd,
            cache: false,
            contentType: false , //Can't use json anymore
            processData: false,
            success:function(data){
                console.log("ddd")
            }
        });

Back-end (using @RequestParam("file") to accept parameters, not using @RequestBoby to accept characters, my plan is to pass @RequestParam and then transfer beans by myself

 @PostMapping("/insertResources")
    @ResponseBody
    public SuccessResponse<Object> insertResources(@RequestParam("file") MultipartFile file, @RequestParam("data") String dataRequest) {
        DataRequest<SpaceClassHomework> spacePicDataRequest = JSON.parseObject(dataRequest, new TypeReference<DataRequest<SpaceClassHomework>>() {
        });
        resourcesService.insertResources(file, spacePicDataRequest.getBody());
        return new SuccessResponse<Object>(null);
    }

New method on the server side

file.transferTo (dest);

@Override
     public  void insertResources(MultipartFile file, SpaceClassHomework spaceClassHomework) {
         // Get the file name 
        String fileName = file.getOriginalFilename();
         // Get the suffix name of the file 
        String suffixName = fileName.substring(fileName.lastIndexOf( " . " )) ;
        String filePath = uploadDir;
        File dest = new File(filePath + fileName);
        try {
            file.transferTo (dest);
        } catch (IOException e) {
            e.printStackTrace ();
            log.error( " File upload failed " );
        }
        spaceClassHomework.setSpaceClassFileName(fileName);
        spaceClassHomework.setSpaceClassFilePath(filePath);
        spaceClassHomeworkMapper.insertSelective(spaceClassHomework);

    }

 

 

download

Front end: little impact

rear end:

1. Can't be the same as usual, add @responseBody

2. When the browser outputs the name, the encoding is not utf-8, but java is utf-8 again. All I use

String fileNameTemp = new String(fileName.getBytes("UTF-8"), "ISO8859-1"); 
set two variables, one for browser output, one for java operation 

3 , spring method,

new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file), headers, HttpStatus.CREATED);

@GetMapping("/getResources")
    public ResponseEntity<byte[]> getSpaceClass(@RequestParam("spaceClassFileId") String spaceClassFileId
            , HttpServletResponse resp) throws Exception {
        String filePath = uploadDir;
         // Get the path and file name 
        String fileName = resourcesService.getResources(Long.parseLong(spaceClassFileId));
        String fileNameTemp = new String(fileName.getBytes("UTF-8"), "ISO8859-1");
        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
        headers.setContentDispositionFormData("attachment", fileNameTemp);
        File file = new File(filePath + fileName);
        return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file), headers, HttpStatus.CREATED);