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 }
