基于单例使用ThreadLocal对多线程下数据的访问修改

 1 package cn.lyy.thread;
 2 
 3 import java.util.Random;
 4 
 5 
 6 /**
 7  * 基于单例模式的基础上，使用ThreadLocal为每一个进入的线程生成一个实例，
 8  * 用来对数据的访问修改而不影响到别的线程对同一个数据的修改
 9  * @author Administrator
10  *
11  */
12 public class ThreadLocalTest {
13 
14     public static void main(String[] args) {
15         for (int i = 0; i < 2; i++) {
16             new Thread(new Runnable() {
17 
18                 @Override
19                 public void run() {
20                     int data = new Random().nextInt(20);
21                     MyThreadScopeData.getThreadInstance().setAddress(
22                             "wuyidaxue" + data);
23                     MyThreadScopeData.getThreadInstance().setAge(data);
24                     new A().get();
25                     new B().get();
26                 }
27             }).start();
28         }
29     }
30 
31     static class A {
32 
33         public void get() {
34             MyThreadScopeData myData = MyThreadScopeData.getThreadInstance();
35             System.out.println("A from " + Thread.currentThread().getName()
36                     + " getMyData: " + myData.getAddress() + ","
37                     + myData.getAge());
38         }
39 
40     }
41 
42     static class B {
43 
44         public void get() {
45 
46             MyThreadScopeData myData = MyThreadScopeData.getThreadInstance();
47             System.out.println("B from " + Thread.currentThread().getName()
48                     + " getMyData: " + myData.getAddress() + ","
49                     + myData.getAge());
50 
51         }
52     }
53 }
54 
55 class MyThreadScopeData {
56 
57     private MyThreadScopeData() {
58     }
59 
60     public static MyThreadScopeData getThreadInstance() {
61         MyThreadScopeData instance = map.get();
62         if (instance == null) {
63             instance = new MyThreadScopeData();
64             map.set(instance);
65         }
66         return instance;
67 
68     }
69 
70     private static ThreadLocal<MyThreadScopeData> map = new ThreadLocal<MyThreadScopeData>();
71 
72     private String address;
73 
74     public String getAddress() {
75         return address;
76     }
77 
78     public void setAddress(String address) {
79         this.address = address;
80     }
81 
82     public int getAge() {
83         return age;
84     }
85 
86     public void setAge(int age) {
87         this.age = age;
88     }
89 
90     private int age;
91 }