1. @MyLog("常用语列表")
    2. @ApiOperation(value = "常用语列表")
    3. @GetMapping(value = "/test/{orderId}")
    4. public void test(@PathVariable String orderId) {
    5.     System.out.println(System.identityHashCode( orderId));
    6.     synchronized (orderId.intern()){
    7.       a = a+1;
    8.       log.info("开始:{}",orderId);
    9.       log.info("结束:{}",orderId);
    10.     }
    11.     System.out.println("a="+a);
    12. }
    14. public static void main(String[] args) {
    15.     System.out.println(System.identityHashCode(new String("a")));
    16.     System.out.println(System.identityHashCode(new String("a")));
    17.     System.out.println(System.identityHashCode(new String("a")));
    18.     System.out.println(System.identityHashCode(new String("a")));
    19.     System.out.println(System.identityHashCode(new String("a")));
    20.     System.out.println(System.identityHashCode(new String("a")));
    21. }
    1.   Map<String, ReentrantLock> mutexCache = new HashMap<>();
    3.     @MyLog("常用语列表")
    4.     @ApiOperation(value = "常用语列表")
    5.     @GetMapping(value = "/test/{orderId}")
    6.     public void test(@PathVariable String orderId) {
    7.         ReentrantLock mutexKey = mutexCache.get(orderId);
    8.         if (mutexKey == null) {
    9.             mutexKey = new ReentrantLock();
    10.             mutexCache.put(orderId, mutexKey);
    11.         }
    12.         mutexKey.lock();
    13.         log.info("开始:{}", orderId);
    14.         log.info("结束:{}", orderId);
    15.         mutexKey.unlock();
    16.         mutexCache.remove(orderId);
    17.         System.out.println(mutexCache.size());
    18.     }