4.16

花费时间 1小时

代码量 150

博客量 1篇

学习知识点 参数检验

• 用到validation自定义校验

package com.di.bigevent.pojo;


import com.di.bigevent.anno.State;
import jakarta.validation.constraints.NotEmpty;
import jakarta.validation.constraints.NotNull;
import jakarta.validation.constraints.Pattern;
import lombok.Data;
import org.hibernate.validator.constraints.URL;

import java.time.LocalDateTime;
@Data
public class Article {
    private Integer id;//主键ID
    @NotEmpty
    @Pattern(regexp = "^\\S{1,10}$")
    private String title;//文章标题
    @NotEmpty
    private String content;//文章内容
    @NotEmpty
    @URL
    private String coverImg;//封面图像
    @State
    private String state;//发布状态 已发布|草稿
    @NotNull
    private Integer categoryId;//文章分类id
    private Integer createUser;//创建人ID
    private LocalDateTime createTime;//创建时间
    private LocalDateTime updateTime;//更新时间
}

//注解类
package com.di.bigevent.anno;

import com.di.bigevent.validation.StateValidation;
import jakarta.validation.Constraint;
import jakarta.validation.Payload;

import java.lang.annotation.*;

@Documented//元注解
@Target({ElementType.FIELD})//元注解，filed在属性中能够使用
@Retention(RetentionPolicy.RUNTIME)//元注解
@Constraint(
        validatedBy = {StateValidation.class}
)//用哪个类里的校验规则
public @interface State {


    //提供校验失败后的提示信息
    String message() default "state参数的值只能是草稿或者已发布";

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

    //负载  获取到State注解的附加信息 //一般用不到不用管
    Class<? extends Payload>[] payload() default {};

 

//注解实现类
package com.di.bigevent.validation;

import com.di.bigevent.anno.State;
import jakarta.validation.ConstraintValidator;
import jakarta.validation.ConstraintValidatorContext;

public class StateValidation implements ConstraintValidator<State,String> {
    @Override
    public boolean isValid(String value, ConstraintValidatorContext context) {

        //提供校验规则
        if(value==null)
        {
            return false;
        }
        if(value.equals("已发布")||value.equals("草稿")){
            return true;
        }
        return false;
    }
}