ThreadLocal类及应用技巧; 实现线程范围内数据共享-白红宇

ThreadLocal类及应用技巧; 实现线程范围内数据共享

阅读量：4151 次

发布时间：2019-05-25

本文共 3008 字，大约阅读时间需要 10 分钟。

public class ThreadTest6 {		private static ThreadLocal
    
      currentLocalThread = new ThreadLocal
     
      ();	private static ThreadLocal
      
        myThreadScopeData = new ThreadLocal
       
        ();	public static void main(String[] args) {		for (int i = 0; i < 2; i++) {			new Thread(					new Runnable() {						@Override						public void run() {							int data = new Random().nextInt();							System.out.println(Thread.currentThread().getName()+ " has put data : " + data);														currentLocalThread.set(data);							//获取与本线程相关的实例							MyThreadScopeData myData = MyThreadScopeData.getThreadInstance();							myData.setName("name" + data);							myData.setAge(data);														//存入当前线程中							myThreadScopeData.set(myData);														new A().get();							new B().get();						}					}			).start();		}	}	static class A{		public void get(){			//int data = localThreadMap.get(Thread.currentThread());			int data = currentLocalThread.get();			System.out.println("A from  " + Thread.currentThread().getName() + " get data :" + data);			//获取与本线程相关的实例			//MyThreadScopeData myData = MyThreadScopeData.getThreadInstance();			//从当前线程中获取			MyThreadScopeData myData = myThreadScopeData.get();			System.out.println("A from  " + Thread.currentThread().getName()					+ " getName ：" + myData.getName() 					+ " , getAge : " + myData.getAge());		}	}	static class B{		public void get(){			//int data = localThreadMap.get(Thread.currentThread());			int data = currentLocalThread.get();			System.out.println("B from  " + Thread.currentThread().getName() + " get data :" + data);			//获取与本线程相关的实例			//MyThreadScopeData myData = MyThreadScopeData.getThreadInstance();			//从当前线程中获取			MyThreadScopeData myData = myThreadScopeData.get();			System.out.println("B from  " + Thread.currentThread().getName()					+ " getName ：" + myData.getName() 					+ " , getAge : " + myData.getAge());		}	}}

class MyThreadScopeData{		private MyThreadScopeData(){}		/**	 * 单例	 * @return	 */	public static /*synchronized*/ MyThreadScopeData getThreadInstance(){		MyThreadScopeData instance = map.get();		if (null == instance) {			instance = new MyThreadScopeData();			map.set(instance);		}				return instance;	}		private static ThreadLocal
    
      map = new ThreadLocal
     
      ();		private String name;	private int age;		public String getName() {		return name;	}	public void setName(String name) {		this.name = name;	}	public int getAge() {		return age;	}	public void setAge(int age) {		this.age = age;	}}

打印结果：

Thread-1 has put data : -1091157391

Thread-0 has put data : -1297198387

A from Thread-1 get data :-1091157391

A from Thread-1 getName ：name-1091157391 , getAge : -1091157391

A from Thread-0 get data :-1297198387

A from Thread-0 getName ：name-1297198387 , getAge : -1297198387

B from Thread-0 get data :-1297198387

B from Thread-0 getName ：name-1297198387 , getAge : -1297198387

B from Thread-1 get data :-1091157391

B from Thread-1 getName ：name-1091157391 , getAge : -1091157391

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