@NotBlank与@Validated在参数校验时的使用

Posted 2022-10-11 SSimeng

1. 在实体类(Student.class)对应的字段加上注解，message为需要提示的信息

package com.example.demo.entity;

import lombok.Data;
import lombok.ToString;

import javax.validation.constraints.NotBlank;
@Data
@ToString
public class Student 
    private int id;
    @NotBlank(message = "学生姓名不能为空！")
    private String name;
    @NotBlank(message = "学生地址不能为空！")
    private String address;

2. 在Controller层加入@Validated，BindingResult则是校验的结果

package com.example.demo.controller;

import com.example.demo.entity.Student;
import org.springframework.validation.BindingResult;
import org.springframework.validation.ObjectError;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RestController;
import java.util.ArrayList;
import java.util.List;

@RestController
public class TestController 
    @PostMapping(path = "/addStudent")
    public List<String> addStudent(@Validated @RequestBody Student student, BindingResult result)
        List<String> errorList = new ArrayList<>();
        if(result.hasErrors())
            //遍历错误集合
            for (ObjectError error :result.getAllErrors()
                    ) 
                errorList.add(error.getDefaultMessage());
            
        
        return errorList;
    

 3.结果(将校验的结果返回了)