How to use Springboot+vue to upload images to the database and display them

1. Front-end settings

The front-end is Vue Element-UI and uses the el-upload component (drawing from the official) to upload images:

<el-upload
     ref="upload"
     class="avatar-uploader"
     action="/setimg"
     :http-request="picUpload"
     :show-file-list="false"
     :auto-upload="false"
     :on-success="handleAvatarSuccess"
     :before-upload="beforeAvatarUpload">
   <img  class="avatar lazy"  src="/static/imghw/default1.png"  data-src="$hostURL+imageUrl"  v-if="$hostURL+imageUrl" :  alt="How to use Springboot+vue to upload images to the database and display them" >
   <i v-else class="el-icon-plus avatar-uploader-icon"></i>
 </el-upload>

<el-button type="primary" @click="submitUpload">修改</el-button>

actionYou can set it casually here, because there is :http-request at the back to set the request yourself. Note that since you write the request yourself, you need :auto-upload="false" , and since the front-end and back-end connections need to solve cross-domain problems, a global variable is defined in $hostURL imageUrl:

//在main.js中
    Vue.prototype.$hostURL='http://localhost:8082'

In methods:

methods:{
//这里是官方的方法不变
    handleAvatarSuccess(res, file){
          this.imageUrl = URL.createObjectURL(file.raw);
    },
    beforeAvatarUpload(file) {
      const isJPG = file.type === 'image/jpeg';
      const isLt2M = file.size / 1024 / 1024 < 2;

      if (!isJPG) {
        this.$message.error(&#39;上传头像图片只能是 JPG 格式!&#39;);
      }
      if (!isLt2M) {
        this.$message.error(&#39;上传头像图片大小不能超过 2MB!&#39;);
      }
      return isJPG && isLt2M;
    },
//这里是自定义发送请求
    picUpload(f){
     let params = new FormData()
     //注意在这里一个坑f.file
     params.append("file",f.file);
     this.$axios({
       method:&#39;post&#39;,
       //这里的id是我要改变用户的ID值
       url:&#39;/setimg/&#39;+this.userForm.id,
       data:params,
       headers:{
         &#39;content-type&#39;:&#39;multipart/form-data&#39;
       }
     }).then(res=>{
     //这里是接受修改完用户头像后的JSON数据
       this.$store.state.menu.currentUserInfo=res.data.data.backUser
       //这里返回的是头像的url
       this.imageUrl = res.data.data.backUser.avatar
     })
   },
   //触发请求
    submitUpload(){
   this.$refs.upload.submit();
    }
}

There is a pitfall in the above code f.file. I read many blogs and found that some blogs only have f but not .file, resulting in 401 and 505 errors.

2. Back-end code

1. Establish database

Here the avatar is the saved partial url of the uploaded image

2. Entity class, Mapper

Entity class:

Using mybatis plus

@Data
public class SysUser extends BaseEntity{
//这里的BaseEntity是id,statu,created,updated数据
    private static final Long serialVersionUID = 1L;

    @NotBlank(message = "用户名不能为空")
    private String username;

//    @TableField(exist = false)
    private String password;
    @NotBlank(message = "用户名称不能为空")
    private String name;
    //头像
    private String avatar;

    @NotBlank(message = "邮箱不能为空")
    @Email(message = "邮箱格式不正确")
    private String email;
    private String tel;
    private String address;
    @TableField("plevel")
    private Integer plevel;
    private LocalDateTime lastLogin;
}

@Mapper
@TableName("sys_user")
public interface SysUserMapper extends BaseMapper<SysUser> {
}

3. Accept the request and return the data

@Value("${file.upload-path}")
private String pictureurl;
@PostMapping("/setimg/{id}")
public Result setImg(@PathVariable("id") Long id, @RequestBody MultipartFile file){
    String fileName = file.getOriginalFilename();
    File saveFile = new File(pictureurl);
    //拼接url，采用随机数，保证每个图片的url不同
    UUID uuid = UUID.randomUUID();
    //重新拼接文件名，避免文件名重名
    int index = fileName.indexOf(".");
    String newFileName ="/avatar/"+fileName.replace(".","")+uuid+fileName.substring(index);
    //存入数据库，这里可以加if判断
    SysUser user = new SysUser();
    user.setId(id);
    user.setAvatar(newFileName);
    sysUserMapper.updateById(user);
    try {
        //将文件保存指定目录
        file.transferTo(new File(pictureurl + newFileName));
    } catch (Exception e) {
        e.printStackTrace();
    }
    System.out.println("保存成功");
    SysUser ret_user = sysUserMapper.selectById(user.getId());
    ret_user.setPassword("");
    return Result.succ(MapUtil.builder()
            .put("backUser",ret_user)
            .map());
}

Save address of pictures in yml file:

file:
  upload-path: D:\Study\MyAdmin\scr

3. Display pictures

1. Backend configuration

Implement front-end Vue :scr If you want to display the avatar image in the url, you must set the static resource configuration in WebMVC

Create the WebConfig class

@Configuration
public class WebConfig implements WebMvcConfigurer{
    private String filePath = "D:/Study/MyAdmin/scr/avatar/";
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/avatar/**").addResourceLocations("file:"+filePath);
        System.out.println("静态资源获取");
    }
}

This way you can display the avatar image

2. Front end Configuration

Pay attention to cross-domain issues and the previous global address variable

vue.config.js file (if not, create it in the same directory as scr):

module.exports = {
    devServer: {
        // 端口号
        open: true,
        host: 'localhost',
        port: 8080,
        https: false,
        hotOnly: false,
        // 配置不同的后台API地址
        proxy: {
            '/api': {
            //后端端口号
                target: 'http://localhost:8082',
                ws: true,
                changOrigin: true,
                pathRewrite: {
                    '^/api': ''
                }
            }
        },
        before: app => {}
    }
}

main .js:

axios.defaults.baseURL = '/api'

The above is the detailed content of How to use Springboot+vue to upload images to the database and display them. For more information, please follow other related articles on the PHP Chinese website!