Spring 数据校验 Validation （4）实现自定义校验

第一步 自定义校验注解

package com.atguigu.Valildator4;


import com.atguigu.Valildator4.CannotBlankValidator.CannotBlankValidator;
import jakarta.validation.Constraint;
import jakarta.validation.Payload;

import java.lang.annotation.*;

@Target({ElementType.METHOD, ElementType.FIELD, ElementType.ANNOTATION_TYPE, ElementType.CONSTRUCTOR, ElementType.PARAMETER})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Constraint(validatedBy = {CannotBlankValidator.class})
public @interface  CannotBlank {
    //默认错误信息
    String message() default "不能包含空格";

    //分组
    Class<?>[] groups() default {};

    //负载
    Class<? extends Payload>[] payload() default {};

    //指定多个时使用
    @Target({ElementType.METHOD, ElementType.FIELD, ElementType.ANNOTATION_TYPE, ElementType.CONSTRUCTOR, ElementType.PARAMETER, ElementType.TYPE_USE})
    @Retention(RetentionPolicy.RUNTIME)
    @Documented
    @interface List {
        CannotBlank[] value();
    }

}

 

 

第二步 编写真正的校验类

package com.atguigu.Valildator4.CannotBlankValidator;

import com.atguigu.Valildator4.CannotBlank;
import jakarta.validation.ConstraintValidator;
import jakarta.validation.ConstraintValidatorContext;

import java.lang.annotation.Annotation;

public class CannotBlankValidator implements ConstraintValidator<CannotBlank,String > {


    @Override
    public void initialize(CannotBlank constraintAnnotation) {

    }

    @Override
    public boolean isValid(String value, ConstraintValidatorContext context) {
        //null时不进行校验
        if (value != null && value.contains(" ")) {
            //获取默认提示信息
            String defaultConstraintMessageTemplate = context.getDefaultConstraintMessageTemplate();
            System.out.println("default message :" + defaultConstraintMessageTemplate);
            //禁用默认提示信息
            context.disableDefaultConstraintViolation();
            //设置提示语
            context.buildConstraintViolationWithTemplate("can not contains blank").addConstraintViolation();
            return false;
        }
        return true;
    }

}

 

 

测试 

、

package com.atguigu.Validator3;

import com.atguigu.Valildator4.CannotBlank;
import jakarta.validation.constraints.*;

public class User {
    @NotNull
    private String name;
    @Max(120)
    @Min(0)
    private int  age;

    @Pattern(regexp = "^1(3|4|5|7|8)\\d{9}$",message = "手机号码格式错误")
    @NotBlank(message = "手机号不能为空")
    private String  phone;

    @CannotBlank
    private  String msg;


    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    public void setName(String name) {
        this.name = name;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }
}

 

package com.atguigu.Validator3;

import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

public class TestUser {
    public static void main(String[] args) {
        ApplicationContext context=
                new AnnotationConfigApplicationContext(ValidationConfig.class);
        Myservice myservice = context.getBean(Myservice.class);
        User user=new User();
        user.setAge(18);
        user.setName("yoyo");
        user.setPhone("15299698836");
        user.setMsg("lll");
        myservice.TestMethod(user);
        System.out.println(" =========== " );
            }
}

 

package com.atguigu.Valildator4;


import com.atguigu.Valildator4.CannotBlankValidator.CannotBlankValidator;
import jakarta.validation.Constraint;
import jakarta.validation.Payload;

import java.lang.annotation.*;

@Target({ElementType.METHOD, ElementType.FIELD, ElementType.ANNOTATION_TYPE, ElementType.CONSTRUCTOR, ElementType.PARAMETER})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Constraint(validatedBy = {CannotBlankValidator.class})
public @interface  CannotBlank {
    //默认错误信息
String message() default "不能包含空格";

    //分组
Class<?>[] groups() default {};

    //负载
Class<? extends Payload>[] payload() default {};

    //指定多个时使用
@Target({ElementType.METHOD, ElementType.FIELD, ElementType.ANNOTATION_TYPE, ElementType.CONSTRUCTOR, ElementType.PARAMETER, ElementType.TYPE_USE})
    @Retention(RetentionPolicy.RUNTIME)
    @Documented
@interface List {
        CannotBlank[] value();
    }

}