前言
本文介绍一种极简洁、灵活通用接口防刷实现方式、通过在需要防刷的方法加上@Prevent 注解即可实现短信防刷；
使用方式大致如下：
@ResponseBody
@GetMapping(value = "/testPrevent")
@Prevent //加上该注解即可实现短信防刷(默认一分钟内不允许重复调用，支持扩展、配置）
public Response testPrevent(TestRequest request) {
return Response.success("调用成功");
}
1、实现防刷切面PreventAop.java
大致逻辑为：定义一切面，通过@Prevent注解作为切入点、在该切面的前置通知获取该方法的所有入参并将其Base64编码，将入参Base64编码+完整方法名作为redis的key，入参作为reids的value，@Prevent的value作为redis的expire，存入redis；每次进来这个切面根据入参Base64编码+完整方法名判断redis值是否存在，存在则拦截防刷，不存在则允许调用；
1.1 定义注解Prevent
package com.zetting.aop;
import java.lang.annotation.*;
@Documented
@Target({ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
public @interface Prevent {
String value() default "60";
String message() default "";
PreventStrategy strategy() default PreventStrategy.DEFAULT;
}
1.2 实现防刷切面PreventAop
package com.zetting.aop;
import com.alibaba.fastjson.JSON;
import com.zetting.common.BusinessException;
import com.zetting.util.RedisUtil;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
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.Method;
import java.util.Base64;
@Aspect
@Component
public class PreventAop {
private static Logger log = LoggerFactory.getLogger(PreventAop.class);
@Autowired
private RedisUtil redisUtil;
@Pointcut("@annotation(com.zetting.aop.Prevent)")
public void pointcut() {
}
@Before("pointcut()")
public void joinPoint(JoinPoint joinPoint) throws Exception {
String requestStr = JSON.toJSONString(joinPoint.getArgs()[0]);
if (StringUtils.isEmpty(requestStr) || requestStr.equalsIgnoreCase("{}")) {
throw new BusinessException("[防刷]入参不允许为空");
}
MethodSignature methodSignature = (MethodSignature) joinPoint.getSignature();
Method method = joinPoint.getTarget().getClass().getMethod(methodSignature.getName(),
methodSignature.getParameterTypes());
Prevent preventAnnotation = method.getAnnotation(Prevent.class);
String methodFullName = method.getDeclaringClass().getName() + method.getName();
entrance(preventAnnotation, requestStr,methodFullName);
return;
}
private void entrance(Prevent prevent, String requestStr,String methodFullName) throws Exception {
PreventStrategy strategy = prevent.strategy();
switch (strategy) {
case DEFAULT:
defaultHandle(requestStr, prevent,methodFullName);
break;
default:
throw new BusinessException("无效的策略");
}
}
private void defaultHandle(String requestStr, Prevent prevent,String methodFullName) throws Exception {
String base64Str = toBase64String(requestStr);
long expire = Long.parseLong(prevent.value());
String resp = redisUtil.get(methodFullName+base64Str);
if (StringUtils.isEmpty(resp)) {
redisUtil.set(methodFullName+base64Str, requestStr, expire);
} else {
String message = !StringUtils.isEmpty(prevent.message()) ? prevent.message() :
expire + "秒内不允许重复请求";
throw new BusinessException(message);
}
}
private String toBase64String(String obj) throws Exception {
if (StringUtils.isEmpty(obj)) {
return null;
}
Base64.Encoder encoder = Base64.getEncoder();
byte[] bytes = obj.getBytes("UTF-8");
return encoder.encodeToString(bytes);
}
}
注：
以上只展示核心代码、其他次要代码（例如redis配置、redis工具类等）可下载源码查阅
2、使用防刷切面
在MyController 使用防刷
package com.zetting.modules.controller;
import com.zetting.aop.Prevent;
import com.zetting.common.Response;
import com.zetting.modules.dto.TestRequest;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class MyController {
@ResponseBody
@GetMapping(value = "/testPrevent")
@Prevent
public Response testPrevent(TestRequest request) {
return Response.success("调用成功");
}
@ResponseBody
@GetMapping(value = "/testPreventIncludeMessage")
@Prevent(message = "10秒内不允许重复调多次", value = "10")//value 表示10表示10秒
public Response testPreventIncludeMessage(TestRequest request) {
return Response.success("调用成功");
}
}3、演示
GIF.gif
gitee 源码：https://gitee.com/Zetting/my-gather/tree/master/springboot-aop-prevent
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