新增文章参数自定义校验

validation.StateValidation

package com.lin.springboot01.validation;

import com.lin.springboot01.anno.State;
import jakarta.validation.ConstraintValidator;
import jakarta.validation.ConstraintValidatorContext;

public class StateValidation implements ConstraintValidator {

    /**
     *
     * @param value    将来要校验的数据
     * @param context   如果返回false，则校验不通过，如果返回true，则校验通过
     * @return
     */
    @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;
    }
}

 anno.State

package com.lin.springboot01.anno;

import com.lin.springboot01.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}) //指定提供校验的类
public @interface State {
    //提供校验失败后的提示信息
    String message() default "State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[] payload() default {};

}

Article

package com.lin.springboot01.pojo;
import com.lin.springboot01.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;
    @NotEmpty
    @Pattern(regexp = "^\\S{1,16}$")
    private String title;
    @NotEmpty
    private String content;
    @NotEmpty
    @URL
    private String coverImg;
    @State  //这个就是我们自定义的数据校验的注解
    private String state;
    @NotNull
    private Integer categoryId;
    private Integer createUser;
    private LocalDateTime createTime;
    private LocalDateTime updateTime;
}

ArticleController

@RestController
@RequestMapping("/article")
public class ArticleController {
    @Autowired
    private ArticleService articleService;
    @PostMapping
    //@Validated pojo中的数据校验生效
    public Result add(@RequestBody @Validated Article article){
        articleService.add(article);
        return Result.success();
    }
}

完成：（state如果不是草稿或者发布的时候，就会提示报错信息。）