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)