如何spring-aop防止重复提交网络请求

具体原理很简单，通过spring-aop的环绕通知，请求开始时将请求参数转换校验是否已存在，已存在则报错，否则存储，请求完成后删除。

具体代码如下：
1、注释@interface

package com.yuntu.commons.intelligent.annotation;import java.lang.annotation.ElementType;import java.lang.annotation.Retention;import java.lang.annotation.RetentionPolicy;import java.lang.annotation.Target;/**
 * Created by niuzy on 2018-09-13.
 */@Target({ElementType.METHOD})@Retention(RetentionPolicy.RUNTIME)public @interface NotDuplicate {}

2、spring切面和环绕通知

import com.yuntu.commons.ServiceException;import com.yuntu.commons.intelligent.ExceptionConstants;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.aspectj.lang.reflect.MethodSignature;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.stereotype.Component;import java.lang.reflect.Method;import java.util.Set;import java.util.concurrent.ConcurrentSkipListSet;/**
 * Created by niuzy on 2018-09-13.
 */@Aspect@Componentpublic class NotDuplicateAop {
 private Logger LOG = LoggerFactory.getLogger(NotDuplicateAop.class); private static final Set<String> KEY = new ConcurrentSkipListSet<>(); @Pointcut("@annotation(com.yuntu.commons.intelligent.annotation.NotDuplicate)") public void duplicate() {
 } /**
 * 对方法拦截后进行参数验证
 * @param pjp
 * @return
 * @throws Throwable
 */
 @Around("duplicate()") public Object duplicate(ProceedingJoinPoint pjp) throws Throwable {
 MethodSignature msig = (MethodSignature) pjp.getSignature();
 Method currentMethod = pjp.getTarget().getClass().getMethod(msig.getName(), msig.getParameterTypes()); //拼接签名
 StringBuilder sb = new StringBuilder(currentMethod.toString());
 Object[] args = pjp.getArgs(); for (Object object : args) { if(object != null){
 sb.append(object.getClass().toString());
 sb.append(object.toString());
 }
 }
 String sign = sb.toString(); boolean success = KEY.add(sign); if(!success){ throw new ServiceException(ExceptionConstants.ILLEGAL_REQUEST_EXCEPTION,"该方法正在执行,不能重复请求");
 } try { return pjp.proceed();
 } finally {
 KEY.remove(sign);
 }

 }
}

3、使用：
在需要的方法上添加@NotDuplicate