java添加实体类参数不能为空约束

//实体类
package .spring_boot_1.;

import ; 
import .*; import ;


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) {
         = username;
    }

    public String getPassword() {
        return password;
    }

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

    public String getConfirmPassword() {
        return confirmPassword;
    }

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

    public String getNickname() {
        return nickname;
    }

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

    public String getRealname() {
        return realname;
    }

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

    public String getMobile() {
        return mobile;
    }

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

    public String getEmail() {
        return email;
    }

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

    public Integer getSex() {
        return sex;
    }

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

    public Date getBirthday() {
        return birthday;
    }

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

   
}

//controller

package .spring_boot_1.;

import ;
import ;
import ;

import ;
import ;
import ;

import ;
import ;
import ;
import ;
import ;
import ;
import ;

import .spring_boot_1.;
import .spring_boot_1.;

@RestController

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

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

	    if (()){
	        Map<String, String> errorsMap = getErrors(result);
	        return (errorsMap);

	    }


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

	    return ();

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

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

	    List<FieldError> fieldErrorsList = ();
	    for (FieldError error:fieldErrorsList){
	        // 错误的属性
	        String errorField = ();
	        //错误的提示
	        String errorMsg = ();
	        (errorField,errorMsg);

	    }
	    return  map;

	}
}

//返回参数类

package .spring_boot_1.;

import ;

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) {
		 = data;
	}
	public String getMsg() {
		return msg;
	}
	public void setMsg(String msg) {
		 = msg;
	}
	public int getStatus() {
		return status;
	}
	public void setStatus(int status) {
		 = status;
	}
	public JSONResult(int i, String string, Object data) {
		=data;
		=i;
		=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();
		(date);
	}
}