Implementation example of Vue+Element+Springboot image upload

<el-form-item label="Cover image">
                <el-upload v-model="dataForm.title"
                        class="avatar-uploader"
                        :limit="1"
                        list-type="picture-card"
                        :on-preview="handlePictureCardPreview"
                        multiple
                        :http-request="uploadFile"
                        :on-remove="handleRemove"
                        :on-change='changeUpload'
                        :file-list="images">
                    <i class="el-icon-plus"></i>
                </el-upload>
            </el-form-item>

return {
                images: [{name: 'food.jpg', url: 'upload/2022/web/20210329194832973.png'}],
                imageUrl: '',
                fileList: [], // File upload data (multiple files in one)
                dialogImageUrl: '',
                dialogVisible: false,
                options: [],
                content: '',
                editorOption: {},
                visible: false,
                dataForm: {
                    id: 0,
                    title: '',
                    content: '',
                    bz: ''
                },
                tempKey: -666666 // Temporary key, used to solve the problem that the half-selected state of the tree item cannot be passed to the backend interface. # To be optimized}

changeUpload: function(file, fileList) {//Preview image this.fileList = fileList;
            },
            uploadFile(file){

            },
            handleRemove(file, fileList) {
            },
            handlePictureCardPreview(file) {
                this.dialogImageUrl = file.url;
                this.dialogVisible = true;
            },

// Form submission dataFormSubmit () {
                const form = new FormData() // FormData object form.append('file', this.fileList);
                form.append('title', this.dataForm.title);
                form.append('content', this.$refs.text.value);
                this.$refs['dataForm'].validate((valid) => {
                    if (valid) {
                        this.$http({
                            url: this.$http.adornUrl(`/sys/inform/${!this.dataForm.id ? 'save' : 'update'}`),
                            method: 'post',
                            data:form
                        }).then(({data}) => {
                            if (data && data.code === 0) {
                                this.$message({
                                    message: 'Operation successful',
                                    type: 'success',
                                    duration: 1500,
                                    onClose: () => {
                                        this.visible = false
                                        this.$emit('refreshDataList')
                                    }
                                })
                            } else {
                                this.$message.error(data.msg)
                            }
                        })
                    }
                })
            }

/**
 * @author lyy
 * Save PC-background upload file*/
@RequestMapping(value = "sys/file/save", method = {RequestMethod.POST, RequestMethod.GET})
@Transactional
public R save(HttpServletRequest request) {
    String classify = request.getParameter("classify");
    MultipartHttpServletRequest multipartRequest = WebUtils
            .getNativeRequest(request, MultipartHttpServletRequest.class);
    String fileName = "";
    if (multipartRequest != null) {
        Iterator<String> names = multipartRequest.getFileNames();
        while (names.hasNext()) {
            List<MultipartFile> files = multipartRequest.getFiles(names.next());
            if (files != null && files.size() > 0) {
                for (MultipartFile file : files) {
                    fileName = file.getOriginalFilename();
                    String SUFFIX = FileUtil.getFileExt(fileName);
                    File uFile = new File();
                    uFile.setFileName(fileName);
                    uFile.setClassify(classify);
                    uFile.setCreateTime(new Date());
                    uFile.setFileType(SUFFIX);
                    String uuid = FileUtil.uuid();
                    try {
                        uFile.setPath(uploadFile(uuid,file) +uuid+"."+SUFFIX);
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                     fileService.save(uFile);
                }
            }
        }
    }
    return R.ok();
}

/**
     * Upload file *@author lyy
     * @param file
     * @return
     * @throws IOException
     * @throws IllegalStateException
     */
    public static String uploadFile(String uuid, MultipartFile file) throws IllegalStateException, IOException {
        String defaultUrl = MyFileConfig.getFilePath();
        String Directory = java.io.File.separator;
        String realUrl = defaultUrl + Directory;
        java.io.File realFile = new java.io.File(realUrl);
        if (!realFile.exists() && !realFile.isDirectory()) {
            realFile.mkdirs();
        }
        String fullFile = realUrl + uuid + "." + FileUtil.getFileExt(file.getOriginalFilename());
        file.transferTo(new java.io.File(fullFile));
        String relativePlanUrl = Directory;
        return relativePlanUrl.replaceAll("\\", "/");
    }