七：java中ThreadLocal共享复杂数据

前记

上一篇温习的是java中线程范围内的共享变量的ThreadLocal方式实现，这次来温习ThreadLocal共享复杂数据的情况

场景及代码

项目当中往往遇到需要共享的不是一个简单的基本数据类型，而是复杂类型，这个时候我们的代码应该怎么写才够优雅呢？

非优雅模式

package com.web.thread;

import java.util.Random;

/*********************************************************************************
//* Copyright (C) 2015 Pingan (PA). All Rights Reserved.
//*
//* Filename:      ThreadScopeShareData.java
//* Revision:      1.0
//* Author:        <gao yunqi>
//* Created On:    2016年3月16日
//* Modified by:
//* Modified On:
//*
//* Description:   <线程范围内的共享变量ThreadLocal--复杂类>
/********************************************************************************/
public class ThreadLocalTest {
private static ThreadLocal<ShareData> threadLocal = new ThreadLocal<ShareData> ();
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();
ShareData shareData = new ShareData();
shareData.setName("MyName"+data);
shareData.setAge(data);
threadLocal.set(shareData);
System.out.println(Thread.currentThread().getName() +
" has put data ==>name: " + shareData.getName() +
" ==>age: " + shareData.getAge());
new Step1().getData();
new Step2().getData();
}
}).start();
}
}
static class Step1{
public void getData(){
ShareData shareData = threadLocal.get();
System.out.println("Step1 from " + Thread.currentThread().getName() +
" get data ==>name: " + shareData.getName() +
" ==>age: " + shareData.getAge());
}

}
static class Step2{
public void getData(){
ShareData shareData = threadLocal.get();
System.out.println("Step2 from " + Thread.currentThread().getName() +
" get data ==>name: " + shareData.getName() +
" ==>age: " + shareData.getAge());
}
}

}
class ShareData{
private String name;
private int age;
/**
* @return the name
*/
public String getName() {
return name;
}
/**
* @param name the name to set
*/
public void setName(String name) {
this.name = name;
}
/**
* @return the age
*/
public int getAge() {
return age;
}
/**
* @param age the age to set
*/
public void setAge(int age) {
this.age = age;
}

}

优雅模式

package com.web.thread;

import java.util.Random;

/*********************************************************************************
//* Copyright (C) 2015 Pingan (PA). All Rights Reserved.
//*
//* Filename:      ThreadScopeShareData.java
//* Revision:      1.0
//* Author:        <gao yunqi>
//* Created On:    2016年3月16日
//* Modified by:
//* Modified On:
//*
//* Description:   <线程范围内的共享变量ThreadLocal--复杂类>
/********************************************************************************/
public class ThreadLocalTest {
private static ThreadLocal<ShareData> threadLocal = new ThreadLocal<ShareData> ();
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();
ShareData.getThreadInstance().setName("MyName"+data);
ShareData.getThreadInstance().setAge(data);

new Step1().getData();
new Step2().getData();
}
}).start();
}
}
static class Step1{
public void getData(){
ShareData shareData = ShareData.getThreadInstance();
System.out.println("Step1 from " + Thread.currentThread().getName() +
" get data ==>name: " + shareData.getName() +
" ==>age: " + shareData.getAge());
}

}
static class Step2{
public void getData(){
ShareData shareData = ShareData.getThreadInstance();
System.out.println("Step2 from " + Thread.currentThread().getName() +
" get data ==>name: " + shareData.getName() +
" ==>age: " + shareData.getAge());
}
}

}
class ShareData{
private static ShareData shareData = null;
private static ThreadLocal<ShareData> tlShareData = new ThreadLocal<ShareData>();

//参照单例模式
private ShareData(){}

public static ShareData getThreadInstance(){
shareData = tlShareData.get();
if(shareData == null){
shareData = new ShareData();
tlShareData.set(shareData);
}
return shareData;
}

private String name;
private int age;
/**
* @return the name
*/
public String getName() {
return name;
}
/**
* @param name the name to set
*/
public void setName(String name) {
this.name = name;
}
/**
* @return the age
*/
public int getAge() {
return age;
}
/**
* @param age the age to set
*/
public void setAge(int age) {
this.age = age;
}

}

以上便是ThreadLocal复杂类型数据的共享