防止多次领取红包进行ID锁

//controller里面使用锁   

 ActivityRedPacket ap = customerService.getActivityRedPacket(params);
  　　 if (synchronizedUtil.lockActivyId.containsKey(ap.getId())) {//MAP(key)锁里面是否存在锁
  　　　　  logger.info("<----------------领取红包客户:" + customeid + "多次操作领取红包！---------------------->");
   　　　　 return;
   　　} else {
   　　　　 synchronizedUtil.synchronizedActivyId(ap.getId());/添加锁
   　　}

　　synchronized (synchronizedUtil.lockActivyId.get(ap.getId())) {//获取锁

　　　　try{

　　　　　　　　　　　　//逻辑

　　　　}finally{

　　　　　　synchronizedUtil.lockActivyId.remove(ap.getId());//释放锁（移除MAP KEY 值）

　　　　}

　　}

//synchronizedUtil工具类

public class synchronizedUtil {

 　　public static final ConcurrentHashMap<Integer, Object> lockVehicle = new ConcurrentHashMap<Integer, Object>();  

　　 public static final ConcurrentHashMap<Integer, Object> lockOrder = new ConcurrentHashMap<Integer, Object>();    

       public static final ConcurrentHashMap<Integer, Object> lockCustomerId = new ConcurrentHashMap<Integer, Object>();    

       public static final ConcurrentHashMap<Integer, Object> lockActivyId = new ConcurrentHashMap<Integer, Object>();    

       public static synchronized void synchronizedVehicle(Integer vehicleId){  

              if (!lockVehicle.containsKey(vehicleId)) {    

                     lockVehicle.put(vehicleId, new Object());       

                     return;   

              }

        }  

        public static synchronized void synchronizedOrder(Integer OrderId){  

               if (!lockOrder.containsKey(OrderId)) {    

                   lockOrder.put(OrderId, new Object());       

                   return;   

                }  

         }    

         public static synchronized void synchronizedCustomerId(Integer CustomerId){   

                if (!lockCustomerId.containsKey(CustomerId)) {    

                     lockCustomerId.put(CustomerId, new Object());       

                     return;   

                 }  

          }    

          public static synchronized void synchronizedActivyId(Integer ActivyId){   

                if (!lockActivyId.containsKey(ActivyId)) {//是否包含此ID锁不包含则放到MAP里    

                         lockActivyId.put(ActivyId, new Object());      

                         return;   

                }  

           }

}

防止多次领取红包进行ID锁

原文：http://www.cnblogs.com/cuijinlong/p/6235777.html