ThreadLocal线程范围内的共享变量

数据库connection和strut2每个请求用到ThreadLocal

import java.util.Random;

public class ThreadLocalTest {
    private static ThreadLocal<Integer> x = new ThreadLocal<Integer>();

    /*
     * private static ThreadLocal<MyThreadScopeData> myThreadScoprData = new
     * ThreadLocal<MyThreadScopeData>();
     */

    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();
                    x.set(data);
                    System.out.println(Thread.currentThread().getName()
                            + " has put data:" + data);
                    /*
                     * MyThreadScopeData myData = new MyThreadScopeData();
                     * myData.setName("yuanhai" + data); myData.setAge("29");
                     * myThreadScoprData.set(myData);
                     */
                    MyThreadScopeData.getThreadInstance().setName(
                            "yuanhai" + data);
                    MyThreadScopeData.getThreadInstance().setAge("29");
                    new A().get();
                    new B().get();
                }
            }).start();

        }

    }

    static class A {
        public void get() {
            int data = x.get();
            System.out.println("A from " + Thread.currentThread().getName()
                    + " get data :" + data);
            MyThreadScopeData myData = MyThreadScopeData.getThreadInstance();
            System.out
                    .println("A from " + Thread.currentThread().getName()
                            + " getMyData :" + myData.getName() + ","
                            + myData.getAge());
        }

    }

    static class B {
        public void get() {
            int data = x.get();
            System.out.println("B from " + Thread.currentThread().getName()
                    + " get data :" + data);
            MyThreadScopeData myData = MyThreadScopeData.getThreadInstance();
            System.out
                    .println("B from " + Thread.currentThread().getName()
                            + " getMyData :" + myData.getName() + ","
                            + myData.getAge());
        }

    }

}

// 实体类单例
class MyThreadScopeData {
    private MyThreadScopeData() {
    }

    public static/* synchronized */MyThreadScopeData getThreadInstance() {
        MyThreadScopeData instance = map.get();
        if (instance == null) {

            instance = new MyThreadScopeData();
            map.set(instance);
        }
        return instance;
    }

    // private static MyThreadScopeData instance = null;// new MyThreadScopeData();
    private String name;
    private String age;
    private static ThreadLocal<MyThreadScopeData> map = new ThreadLocal<MyThreadScopeData>();

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAge() {
        return age;
    }

    public void setAge(String age) {
        this.age = age;
    }

}