OrderValidator

最新推荐文章于 2021-11-04 17:21:08 发布

转载最新推荐文章于 2021-11-04 17:21:08 发布 · 164 阅读

0 ·

CC 4.0 BY-SA版权

原文链接：http://www.cnblogs.com/tonggc1668/p/11318606.html

文章标签：

#java #runtime

本文介绍了使用Java注解进行排序参数验证的方法，包括自定义注解@Order和@Sort，以及对应的验证器OrderValidator和SortValidator。这些注解可以确保传入的排序类型和字段符合预设的有效值。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

package org.linlinjava.litemall.core.validator;

import javax.validation.Constraint;
import javax.validation.Payload;
import java.lang.annotation.Documented;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;

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

@Target({METHOD, FIELD, PARAMETER})
@Retention(RUNTIME)
@Documented
@Constraint(validatedBy = OrderValidator.class)
public @interface Order {
    String message() default "排序类型不支持";

    String[] accepts() default {"desc", "asc"};

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

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

package org.linlinjava.litemall.core.validator;

import com.google.common.collect.Lists;

import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
import java.util.List;

public class OrderValidator implements ConstraintValidator<Order, String> {
    private List<String> valueList;

    @Override
    public void initialize(Order order) {
        valueList = Lists.newArrayList();
        for (String val : order.accepts()) {
            valueList.add(val.toUpperCase());
        }
    }

    @Override
    public boolean isValid(String s, ConstraintValidatorContext constraintValidatorContext) {
        if (!valueList.contains(s.toUpperCase())) {
            return false;
        }
        return true;
    }
}

package org.linlinjava.litemall.core.validator;

import javax.validation.Constraint;
import javax.validation.Payload;
import java.lang.annotation.Documented;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;

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

@Target({METHOD, FIELD, PARAMETER})
@Retention(RUNTIME)
@Documented
@Constraint(validatedBy = SortValidator.class)
public @interface Sort {
    String message() default "排序字段不支持";

    String[] accepts() default {"add_time", "id"};

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

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

package org.linlinjava.litemall.core.validator;

import com.google.common.collect.Lists;

import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
import java.util.List;

public class SortValidator implements ConstraintValidator<Sort, String> {
    private List<String> valueList;

    @Override
    public void initialize(Sort sort) {
        valueList = Lists.newArrayList();
        for (String val : sort.accepts()) {
            valueList.add(val.toUpperCase());
        }
    }

    @Override
    public boolean isValid(String s, ConstraintValidatorContext constraintValidatorContext) {
        if (!valueList.contains(s.toUpperCase())) {
            return false;
        }
        return true;
    }
}