1 package com.xm.pojo;
 2
 3 import javax.validation.constraints.Min;
 4
 5 import org.hibernate.validator.constraints.NotBlank;
 6
 7 public class User {
 8     @Min(value=10,message="id不可以小于10")
 9     private int id;
10     @NotBlank(message="name不能为空")
11     private String name;
12     public int getId() {
13         return id;
14     }
15     public void setId(int id) {
16         this.id = id;
17     }
18     public String getName() {
19         return name;
20     }
21     public void setName(String name) {
22         this.name = name;
23     }
24     @Override
25     public String toString() {
26         return "User [id=" + id + ", name=" + name + "]";
27     }
28
29
30 }

 1 package com.xm.controller;
 2
 3 import java.util.List;
 4
 5 import javax.validation.Valid;
 6
 7 import org.springframework.validation.BindingResult;
 8 import org.springframework.validation.FieldError;
 9 import org.springframework.web.bind.annotation.PostMapping;
10 import org.springframework.web.bind.annotation.RequestMapping;
11 import org.springframework.web.bind.annotation.RestController;
12
13 import com.xm.pojo.User;
14
15 @RestController
16 public class UserController {
17
18     @RequestMapping("/hello")
19     public String hello() {
20         return "hello spring boot!";
21     }
22
23     @PostMapping("/user")
24     public String addUser(@Valid User user,BindingResult result) {
25         if(result.hasErrors()) {
26
27              List<FieldError> fieldErrors = result.getFieldErrors();
28             for(FieldError error : fieldErrors) {
29                 System.out.println(error.getDefaultMessage());
30             }
31             return fieldErrors.toString();
32         }
33         return user.toString();
34     }
35
36 }