private static ThreadLocal<String> uuID = new ThreadLocal<String>(){
protected synchronized String initialValue(){
return null;
}
};
public static String getNextUUID(){
try {
if(uuID.get() != null)
return uuID.get();
uuID.set(UUIDUtil.replaceString(UUIDUtil.getUUID(), "-", ‘-‘));
return uuID.get();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
//测试线程
package com.ushi.montor.test;
import com.ushi.montor.util.UUIDUtil;
public class TestClient extends Thread {
public void run(){
for(int i = 0 ; i < 3; i++){
System.out.println("thread[" + Thread.currentThread().getName()+"] sn[" + UUIDUtil.getNextUUID() + "]");
}
}
}
//测试类
package com.ushi.montor.test;
public class TestThreadLocal {
public static void main(String[] args) {
// 3个线程共享sn，各自产生序列号
TestClient t1 = new TestClient();
TestClient t2 = new TestClient();
TestClient t3 = new TestClient();
t1.start();
t2.start();
t3.start();
}
}
//执行结果
thread[Thread-1] sn[6c9324d1b7774e2891179c57294b5e52]
thread[Thread-1] sn[6c9324d1b7774e2891179c57294b5e52]
thread[Thread-1] sn[6c9324d1b7774e2891179c57294b5e52]
thread[Thread-0] sn[402526757d824d0988572b706dea7334]
thread[Thread-0] sn[402526757d824d0988572b706dea7334]
thread[Thread-0] sn[402526757d824d0988572b706dea7334]
thread[Thread-2] sn[1b10c4b83a43401da369c823cd1f7c2d]
thread[Thread-2] sn[1b10c4b83a43401da369c823cd1f7c2d]
thread[Thread-2] sn[1b10c4b83a43401da369c823cd1f7c2d]
原文：http://my.oschina.net/cpy/blog/486121