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PreventRepeatSubmit

基于注解和redis的分布式锁实现防重复提交

关键词

springboot、redis分布式锁、自定义注解、防重复点击

背景

同一条数据被用户点击了多次，导致数据冗余，需要防止弱网络等环境下的重复点击

目标

通过在指定的接口处添加注解，实现根据指定的接口参数来防重复点击

说明

这里的重复点击是指在指定的时间段内多次点击按钮

技术方案

springboot + redis锁 + 注解

使用 feign client 进行请求测试

最终的使用实例

1、根据接口收到 PathVariable 参数判断唯一

/**
     *  根据请求参数里的 PathVariable 里获取的变量进行接口级别防重复点击
     *
     * @param testId 测试id
     * @param requestVo 请求参数
     * @return
     * @author daleyzou
     */
    @PostMapping("/test/{testId}")
    @NoRepeatSubmit(location = "thisIsTestLocation", seconds = 6)
    public RsVo thisIsTestLocation(@PathVariable Integer testId, @RequestBody RequestVo requestVo) throws Throwable {
        // 睡眠 5 秒，模拟业务逻辑
        Thread.sleep(5);
        return RsVo.success("test is return success");
    }

2、根据接口收到的 RequestBody 中指定变量名的值判断唯一

/**
     *  根据请求参数里的 RequestBody 里获取指定名称的变量param5的值进行接口级别防重复点击
     *
     * @param testId 测试id
     * @param requestVo 请求参数
     * @return
     * @author daleyzou
     */
    @PostMapping("/test/{testId}")
    @NoRepeatSubmit(location = "thisIsTestBody", seconds = 6, argIndex = 1, name = "param5")
    public RsVo thisIsTestBody(@PathVariable Integer testId, @RequestBody RequestVo requestVo) throws Throwable {
        // 睡眠 5 秒，模拟业务逻辑
        Thread.sleep(5);
        return RsVo.success("test is return success");
    }

ps: jedis 2.9 和 springboot有各种兼容问题，无奈只有降低springboot的版本了

运行结果

收到响应：{"succeeded":true,"code":500,"msg":"操作过于频繁，请稍后重试","data":null}
收到响应：{"succeeded":true,"code":500,"msg":"操作过于频繁，请稍后重试","data":null}
收到响应：{"succeeded":true,"code":500,"msg":"操作过于频繁，请稍后重试","data":null}
收到响应：{"succeeded":true,"code":200,"msg":"success","data":"test is return success"}

测试用例

package com.dalelyzou.preventrepeatsubmit.controller;

import com.dalelyzou.preventrepeatsubmit.PreventrepeatsubmitApplicationTests;
import com.dalelyzou.preventrepeatsubmit.service.AsyncFeginService;
import com.dalelyzou.preventrepeatsubmit.vo.RequestVo;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;

import java.io.IOException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

/**
 * TestControllerTest
 * @description 防重复点击测试类
 * @author daleyzou
 * @date 2020年09月28日 17:13
 * @version 1.3.1
 */
class TestControllerTest extends PreventrepeatsubmitApplicationTests {
    @Autowired
    AsyncFeginService asyncFeginService;

    @Test
    public void thisIsTestLocation() throws IOException {
        RequestVo requestVo = new RequestVo();
        requestVo.setParam5("random");
        ExecutorService executorService = Executors.newFixedThreadPool(4);
        for (int i = 0; i <= 3; i++) {
            executorService.execute(() -> {
                String kl = asyncFeginService.thisIsTestLocation(requestVo);
                System.err.println("收到响应：" + kl);
            });
        }
        System.in.read();
    }

    @Test
    public void thisIsTestBody() throws IOException {
        RequestVo requestVo = new RequestVo();
        requestVo.setParam5("special");
        ExecutorService executorService = Executors.newFixedThreadPool(4);
        for (int i = 0; i <= 3; i++) {
            executorService.execute(() -> {
                String kl = asyncFeginService.thisIsTestBody(requestVo);
                System.err.println("收到响应：" + kl);
            });
        }
        System.in.read();
    }
}

定义一个注解

package com.dalelyzou.preventrepeatsubmit.aspect;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * NoRepeatSubmit
 * @description 重复点击的切面
 * @author daleyzou
 * @date 2020年09月23日 14:35
 * @version 1.4.8
 */
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface NoRepeatSubmit {
    /**
     * 锁过期的时间
     * */
    int seconds() default 5;
    /**
     * 锁的位置
     * */
    String location() default "NoRepeatSubmit";
    /**
     * 要扫描的参数位置
     * */
    int argIndex() default 0;
    /**
     * 参数名称
     * */
    String name() default "";
}

根据指定的注解定义一个切面，根据参数中的指定值来判断请求是否重复

package com.dalelyzou.preventrepeatsubmit.aspect;

import com.dalelyzou.preventrepeatsubmit.constant.RedisKey;
import com.dalelyzou.preventrepeatsubmit.service.LockService;
import com.dalelyzou.preventrepeatsubmit.vo.RsVo;
import com.google.common.collect.Maps;
import com.google.gson.Gson;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;

import java.lang.reflect.Field;
import java.util.Map;

@Aspect
@Component
public class NoRepeatSubmitAspect {
    private static final Logger logger = LoggerFactory.getLogger(NoRepeatSubmitAspect.class);

    private static Gson gson = new Gson();

    private static final String SUFFIX = "SUFFIX";

    @Autowired
    LockService lockService;

    /**
     * 横切点
     */
    @Pointcut("@annotation(noRepeatSubmit)")
    public void repeatPoint(NoRepeatSubmit noRepeatSubmit) {
    }

    /**
     *  接收请求，并记录数据
     */
    @Around(value = "repeatPoint(noRepeatSubmit)")
    public Object doBefore(ProceedingJoinPoint joinPoint, NoRepeatSubmit noRepeatSubmit) {
        String key = RedisKey.NO_REPEAT_LOCK_PREFIX + noRepeatSubmit.location();
        Object[] args = joinPoint.getArgs();
        String name = noRepeatSubmit.name();
        int argIndex = noRepeatSubmit.argIndex();
        String suffix;
        if (StringUtils.isEmpty(name)) {
            suffix = String.valueOf(args[argIndex]);
        } else {
            Map<String, Object> keyAndValue = getKeyAndValue(args[argIndex]);
            Object valueObj = keyAndValue.get(name);
            if (valueObj == null) {
                suffix = SUFFIX;
            } else {
                suffix = String.valueOf(valueObj);
            }
        }
        key = key + ":" + suffix;
        logger.info("==================================================");
        for (Object arg : args) {
            logger.info(gson.toJson(arg));
        }
        logger.info("==================================================");
        int seconds = noRepeatSubmit.seconds();
        logger.info("lock key : " + key);
        if (!lockService.isLock(key, seconds)) {
            return RsVo.fail("操作过于频繁，请稍后重试");
        }
        try {
            Object proceed = joinPoint.proceed();
            return proceed;
        } catch (Throwable throwable) {
            logger.error("运行业务代码出错", throwable);
            throw new RuntimeException(throwable.getMessage());
        } finally {
            lockService.unLock(key);
        }
    }

    public static Map<String, Object> getKeyAndValue(Object obj) {
        Map<String, Object> map = Maps.newHashMap();
        // 得到类对象
        Class userCla = (Class) obj.getClass();
        /* 得到类中的所有属性集合 */
        Field[] fs = userCla.getDeclaredFields();
        for (int i = 0; i < fs.length; i++) {
            Field f = fs[i];
            // 设置些属性是可以访问的
            f.setAccessible(true);
            Object val = new Object();
            try {
                val = f.get(obj);
                // 得到此属性的值
                // 设置键值
                map.put(f.getName(), val);
            } catch (IllegalArgumentException e) {
                logger.error("getKeyAndValue IllegalArgumentException", e);
            } catch (IllegalAccessException e) {
                logger.error("getKeyAndValue IllegalAccessException", e);
            }

        }
        logger.info("扫描结果：" + gson.toJson(map));
        return map;
    }
}

项目完整代码

https://github.com/daleyzou/PreventRepeatSubmit