新增文章接口、参数校验、自定义校验-优快云博客

package com.itheima.controller;

import com.itheima.pojo.Article;
import com.itheima.pojo.Result;
import com.itheima.service.ArticleService;
import com.itheima.utils.JwtUtil;
import jakarta.servlet.http.HttpServletResponse;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.util.Map;

@RestController
@RequestMapping("/article")
public class ArticleController {
    @Autowired
    private ArticleService articleService;
    @PostMapping
    public Result add(@RequestBody Article article){
        articleService.add(article);
        return Result.success();

    }



}

1.2ArticleService

package com.itheima.service;

import com.itheima.pojo.Article;

public interface ArticleService {
    //新增文章
    void add(Article article);
}

ArticleServiceImpl

package com.itheima.service.impl;

import com.itheima.mapper.ArticleMapper;
import com.itheima.pojo.Article;
import com.itheima.service.ArticleService;
import com.itheima.utils.ThreadLocalUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.Map;

@Service
public class ArticleServiceImpl implements ArticleService {

    @Autowired
    private ArticleMapper articleMapper;
    @Override
    public void add(Article article) {
        //补充属性值
        article.setCreateTime(LocalDateTime.now());
        article.setUpdateTime(LocalDateTime.now());
        Map<String,Object> map = ThreadLocalUtil.get();
         Integer userId= (Integer) map.get("id");
         article.setCreateUser(userId);

        articleMapper.add(article);


    }
}

1.3ArticleMapper

package com.itheima.mapper;

import com.itheima.pojo.Article;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Mapper;

@Mapper

public interface ArticleMapper {
    //新增
    @Insert("insert into article(title,content,cover_img,state,category_id,create_user,create_time,update_time)"+
    "values(#{title},#{content},#{coverImg},#{state},#{categoryId},#{createUser},#{createTime},#{updateTime})")
    void add(Article article);
}

2.1测试

3.1参数校验

3.1.1实体类中添加注解

package com.itheima.pojo;


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
    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
}

3.1.2控制器中添加Valtion注解

   public Result add(@RequestBody @Validated Article article){
        articleService.add(article);
        return Result.success();

    }

3.1.3测试

将标题设置为空

4.1自定义校验

已有的注解不能满足校验需求，特殊的情况要自定义校验（自定义校验注解）

（1）自定义注解State

(2)自定义校验数据的类StateValidation实现ConstraintValidator接口

（3）在需要校验位地方使用自定义注解

4.1.1

创建一个包用于存放自定义注解，再创建一个类

package com.itheima.anno;

import jakarta.validation.Constraint;
import jakarta.validation.Payload;

import java.lang.annotation.*;

import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

@Documented//元注解
@Target({FIELD})//元注解
@Retention(RUNTIME)//元注解
@Constraint(validatedBy = {})

public @interface State {
    //提供校验失败后的提示信息
    String message() default "state参数的值只能是已发布或者草稿";
    //指定分组

    Class<?>[] groups() default {};
    //负载  获取到State注解的附加信息

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

4.1.2

新创建一个包和一个类，这个类需要实现一个接口

package com.itheima.validation;

import com.itheima.anno.State;
import jakarta.validation.ConstraintValidator;
import jakarta.validation.ConstraintValidatorContext;

public class StateValidation implements ConstraintValidator<State,String> {
    /**
     * @param value   将来要校验的数据
     * @param context context in which the constraint is evaluated
     * @return 如果返回false, 则校验不通过，如果返回true，则校验通过
     */


    @Override
    public boolean isValid(String value, ConstraintValidatorContext context) {
        //提供规则
        if (value == null) {
            return false;
        }
        if (value.equals("已发布") || value.equals("草稿")) {
            return true;
        }
        return false;
    }
}

4.1.3进行整合将其赋值

State.java

package com.itheima.anno;

import com.itheima.validation.StateValidation;
import jakarta.validation.Constraint;
import jakarta.validation.Payload;

import java.lang.annotation.*;

import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

@Documented//元注解
@Target({FIELD})//元注解
@Retention(RUNTIME)//元注解
@Constraint(validatedBy = {StateValidation.class})//指定提供校验规则的类


public @interface State {
    //提供校验失败后的提示信息
    String message() default "state参数的值只能是已发布或者草稿";
    //指定分组

    Class<?>[] groups() default {};
    //负载  获取到State注解的附加信息

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

实体类

   @State
    private String state;//发布状态 已发布|草稿

5.1测试

5.1.1

修改数据

5.1.2

修改测试数据

自定义校验规则生效

总结：自定义校验

（1）自定义注解State

message/groups/payload

(2)自定义校验数据的类StateValidation

(3)在需要校验的地方使用自定义注解