java添加实体类参数不能为空约束

//实体类
package com.zkdj.urlCheck.spring_boot_1.main.java.model;

import org.hibernate.validator.constraints.Length; 
import javax.validation.constraints.*; import java.util.Date;


public class User{

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


    @NotBlank(message = "用户昵称不能为空")
    @Length(max = 12, message = "用户昵称不能超过12位")
    private String nickname;

    @Length(max = 12, message = "用户真实姓名不能超过12位")
    private String realname;

    @Pattern(regexp = "^(((13[0-9]{1})|(15[0-9]{1})|(18[0-9]{1}))+\\d{8})$", message = "手机号格式不正确")
    private String mobile;

    @Email
    private String email;

    @Min(value = 0, message = "性别选择不正确")// 0已下
    @Max(value = 2, message = "性别选择不正确")// 2以上
    private Integer sex;

    private Date birthday;

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getConfirmPassword() {
        return confirmPassword;
    }

    public void setConfirmPassword(String confirmPassword) {
        this.confirmPassword = confirmPassword;
    }

    public String getNickname() {
        return nickname;
    }

    public void setNickname(String nickname) {
        this.nickname = nickname;
    }

    public String getRealname() {
        return realname;
    }

    public void setRealname(String realname) {
        this.realname = realname;
    }

    public String getMobile() {
        return mobile;
    }

    public void setMobile(String mobile) {
        this.mobile = mobile;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public Integer getSex() {
        return sex;
    }

    public void setSex(Integer sex) {
        this.sex = sex;
    }

    public Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }

   
}

//controller

package com.zkdj.urlCheck.spring_boot_1.main.java.controller.blank;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.validation.Valid;

import org.springframework.validation.BindingResult;
import org.springframework.validation.FieldError;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import com.zkdj.urlCheck.spring_boot_1.main.java.model.User;
import com.zkdj.urlCheck.spring_boot_1.main.java.utils.JSONResult;

@RestController

@RequestMapping("/api/blank")
public class BlankController {

	@PostMapping("update")
	public JSONResult update(
	         @Valid User user,
	        BindingResult result,
	        HttpServletRequest request, HttpServletResponse response) {

	    if (result.hasErrors()){
	        Map<String, String> errorsMap = getErrors(result);
	        return JSONResult.errorMap(errorsMap);

	    }


	    // TODO 后续要改，增加令牌token，会整合进redis，分布式会话

	    return JSONResult.ok();

	}
	public Map<String,String> getErrors(BindingResult result){

	    Map<String,String> map=new HashMap<>();

	    List<FieldError> fieldErrorsList = result.getFieldErrors();
	    for (FieldError error:fieldErrorsList){
	        // 错误的属性
	        String errorField = error.getField();
	        //错误的提示
	        String errorMsg = error.getDefaultMessage();
	        map.put(errorField,errorMsg);

	    }
	    return  map;

	}
}

//返回参数类

package com.zkdj.urlCheck.spring_boot_1.main.java.utils;

import java.util.Date;

public class JSONResult {

	/**
	 * 数据
	 */
	private Object data;
	/**
	 * 消息提示
	 */
	private String msg;
	/**
	 * 状态码
	 */
	private int status;
	
	
	public Object getData() {
		return data;
	}
	public void setData(Object data) {
		this.data = data;
	}
	public String getMsg() {
		return msg;
	}
	public void setMsg(String msg) {
		this.msg = msg;
	}
	public int getStatus() {
		return status;
	}
	public void setStatus(int status) {
		this.status = status;
	}
	public JSONResult(int i, String string, Object data) {
		this.data=data;
		this.status=i;
		this.msg=string;
		
		
	}
	public static JSONResult errorMap(Object data) {
	    return new JSONResult(501, "error", data);
	}
	public static JSONResult ok() {
		return new JSONResult(200, "success", "good");
	}
	
	public static void main(String[] args) {
		Date date = new Date();
		System.out.println(date);
	}
}