试试ThreadLocal

public final class Resource {
	private static Resource instance = new Resource();

	private Resource() {
		System.err.println("The resource initializing...!");
	}

	public static Resource getInstance() {
		return instance;
	}

	public void start() {
		System.err.println("The resource starting...!");
	}

	public void end() {
		System.err.println("The resource ending...!");
	}

	public void destory() {
		System.err.println("The resource destroying...!");
	}
}

/**
 * Use the thread locale 
 * @author Administrator
 */
public final class ResourceUtil {
	private static ThreadLocal<Resource> resHandler = new ThreadLocal<Resource>();
	
	public final static Resource getResource() {
		Resource resource = resHandler.get();
		if (resource == null) {
			resource = Resource.getInstance();
			resHandler.set(resource);
		}
		return resource;
	}
	
	public final static void work() {
		Resource resource = getResource();
		resource.start();
		resource.end();
		destroy();
	}
	
	public final static void destroy() {
		Resource resource = resHandler.get();
		if (resource != null) {
			resource.destory();
			resHandler.remove();
		}
		resource = null;
	}
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		new Thread() {
			@Override
			public void run() {
				ResourceUtil.work();
				System.err.println(Thread.currentThread() + " : go away!");
			}
		}.start();
		new Thread() {
			@Override
			public void run() {
				ResourceUtil.work();
				System.err.println(Thread.currentThread() + " : go away!");
			}
		}.start();
		new Thread() {
			@Override
			public void run() {
				ResourceUtil.work();
				System.err.println(Thread.currentThread() + " : go away!");
			}
		}.start();
		new Thread() {
			@Override
			public void run() {
				ResourceUtil.work();
				System.err.println(Thread.currentThread() + " : go away!");
			}
		}.start();
		new Thread() {
			@Override
			public void run() {
				ResourceUtil.work();
				System.err.println(Thread.currentThread() + " : go away!");
			}
		}.start();
		new Thread() {
			@Override
			public void run() {
				ResourceUtil.work();
				System.err.println(Thread.currentThread() + " : go away!");
			}
		}.start();
		new Thread() {
			@Override
			public void run() {
				ResourceUtil.work();
				System.err.println(Thread.currentThread() + " : go away!");
			}
		}.start();
		new Thread() {
			@Override
			public void run() {
				ResourceUtil.work();
				System.err.println(Thread.currentThread() + " : go away!");
			}
		}.start();
		
	}

}

评论

10 楼 beneo 2010-06-09  

zha_zi 写道

为什么会内存泄露？求解答

我目前觉得有2种内存泄漏

1. 线程池引起的内存泄漏

2. 如果你的Threadlocal里面的value，强引用了你的ThreadLocal自身

9 楼 yunj 2010-06-09  

真巧今天就看了别人分享的ThreadLocal，有些新发现：
原以为ThreadLocal里有一个Map, Key为Thread.id或Thread对象
今天知道, 这个Map在Thread类里，key 为ThreadLocal对象

8 楼 J-catTeam 2010-05-27  

ThreadLocal 和线程安全没有什么关系

7 楼 laolinshi 2010-05-27  

你的Resource是单实例的，放到ThreadLocal也不能保证线程安全，这样做有意义吗？不明白你这样做的理由。

6 楼 zha_zi 2010-05-27  

为什么会内存泄露？求解答

5 楼 qiren83 2010-05-27  

我咋看不懂呀

4 楼 qiren83 2010-05-27  

The resource starting...!
The resource ending...!
The resource destroying...!
Thread[Thread-2,5,main] : go away!
The resource starting...!
The resource ending...!
The resource destroying...!
Thread[Thread-0,5,main] : go away!
The resource starting...!
The resource ending...!
The resource destroying...!
Thread[Thread-1,5,main] : go away!
The resource starting...!
The resource ending...!
The resource destroying...!
The resource starting...!
The resource ending...!
The resource destroying...!
The resource starting...!
The resource ending...!
The resource destroying...!
Thread[Thread-6,5,main] : go away!
The resource starting...!
The resource ending...!
The resource destroying...!
Thread[Thread-5,5,main] : go away!
The resource starting...!
The resource ending...!
The resource destroying...!
Thread[Thread-3,5,main] : go away!
Thread[Thread-4,5,main] : go away!
Thread[Thread-7,5,main] : go away!


有啥不对吗？

3 楼 xx521 2010-05-27  

有道理：







久久资讯网

2 楼 beneo 2010-05-26  

sdh5724 写道

万恶之源， 内存泄露主因。

如果没有线程池，就没有内存泄漏了吧，对与ThreadLocal

1 楼 sdh5724 2010-05-26  

万恶之源， 内存泄露主因。