springboot validate校验

引入依赖

            org.springframework.boot
            spring-boot-starter-validation
        
        
            org.springframework.boot
            spring-boot-starter-data-jpa
        

创建类UserController

@RestController
public class UserController {
    @PostMapping("/save")
    //要给校验的参数加上@Valid
    public void saveUser(@Valid @RequestBody User user){
        //save...
    }
}

创建User实体类

@Entity
@Data
public class User {

    @Id
    @GeneratedValue
    private long id;

    @NotBlank
    @Length(max=10,message = "长度不能超过十")
    @Column(nullable = false)
    private String userName;

    @NotBlank(message = "密码不能为空")
    @Column(nullable = false)
    private String password;

    @Max(value = 120,message = "最大年龄不超过120")
    @Min(value = 1,message = "大于1")
    @Column(nullable = false)
    private int age;
}

为了系统的完整性，增加系统异常的处理

创建类ValidateCommonHandler

public class ValidateCommonHandler extends ResponseEntityExceptionHandler {


    protected ResponseEntity