@Validation检验_自定义校验

1.导入pom文件

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-validation</artifactId>
</dependency>

2在validation文件夹下创建StateValidation类

import jakarta.validation.ConstraintValidator;
import jakarta.validation.ConstraintValidatorContext;
import com.xzy.bigevent.anno.State;
/*
@param value 将来要校验的数据
@ context context in which the constraint is evaluated
@return 如果返回false,则校验不通过，，返回true，则校验通过。
 */
public class StateValidation implements ConstraintValidator<State, String> {
    @Override
    public boolean isValid(String value, ConstraintValidatorContext constraintValidatorContext) {
        //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;
    }
}

3.创建注解类

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

import java.lang.annotation.*;

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

@Documented  //元注解
@Target(FIELD) //元注解
@Retention(RetentionPolicy.RUNTIME) //元注解
//加入自定义的StateValidation类
@Constraint(
        validatedBy = { StateValidation.class}
)
public @interface State {
    String message() default "{jakarta.validation.constraints.NotEmpty.message}";

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

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

4.对article类的state属性使用该注解

5.方法的属性中中使用@Validationed开启校验

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

6.使用postman工具查看结果