ThreadLocal的使用及介绍

import java.util.Random;/*** ThreadLocal实例* 源自http://lavasoft.blog.51cto.com/62575/51926/* @author yinchuan.chen**/public class ThreadLocalDemo implements Runnable {//创建线程局部变量studentLocal，在后面你会发现用来保存Student对象PRivate final static ThreadLocal studentLocal = new ThreadLocal();public static void main(String[] agrs) {ThreadLocalDemo td = new ThreadLocalDemo();Thread t1 = new Thread(td, "a");Thread t2 = new Thread(td, "b");t1.start();t2.start();}public void run() {accessStudent();}/*** 示例业务方法，用来测试*/public void accessStudent() {//获取当前线程的名字String currentThreadName = Thread.currentThread().getName();System.out.println(currentThreadName + " is running!");//产生一个随机数并打印Random random = new Random();int age = random.nextInt(100);System.out.println("thread " + currentThreadName + " set age to:" + age);//获取一个Student对象，并将随机数年龄插入到对象属性中Student student = getStudent();student.setAge(age);System.out.println("thread " + currentThreadName + " first read age is:" + student.getAge());try {Thread.sleep(500);}catch (InterruptedException ex) {ex.printStackTrace();}System.out.println("thread " + currentThreadName + " second read age is:" + student.getAge());}protected Student getStudent() {//获取本地线程变量并强制转换为Student类型Student student = (Student) studentLocal.get();//线程首次执行此方法的时候，studentLocal.get()肯定为nullif (student == null) {//创建一个Student对象，并保存到本地线程变量studentLocal中student = new Student();studentLocal.set(student);}return student;}}class Student {private int age = 0; //年龄public int getAge() {return this.age;}public void setAge(int age) {this.age = age;}}

本文源自http://lavasoft.blog.51cto.com/62575/51926/