用ThreadPoolExecutor的时候，又想知道被执行的任务的执行情况，这时就可以用FutureTask。

ThreadPoolTask

package com.paul.threadPool;import java.io.Serializable;import java.util.concurrent.Callable;public class ThreadPoolTask implements Callable<String>, Serializable { private static final long serialVersionUID = 0; // 保存任务所需要的数据 private Object threadPoolTaskData; private static int consumeTaskSleepTime = 2000; public ThreadPoolTask(Object tasks) { this.threadPoolTaskData = tasks; } public synchronized String call() throws Exception { // 处理一个任务，这里的处理方式太简单了，仅仅是一个打印语句 System.out.println("开始执行任务：" + threadPoolTaskData); String result = ""; // //便于观察，等待一段时间 try {// long r = 5/0; for ( int i= 0 ; i< 100000000 ; i++){ } result = "OK"; } catch (Exception e) { e.printStackTrace(); result = "ERROR"; } threadPoolTaskData = null; return result; }}

模拟客户端提交的线程

package com.paul.threadPool;import java.util.concurrent.ExecutionException;import java.util.concurrent.FutureTask;import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;public class StartTaskThread implements Runnable{ private ThreadPoolTaskExecutor threadPoolTaskExecutor; private int i; public StartTaskThread(ThreadPoolTaskExecutor threadPoolTaskExecutor,int i) { this.threadPoolTaskExecutor = threadPoolTaskExecutor; this.i = i; } @Override public synchronized void run() { String task = "task@ " + i; System.out.println("创建任务并提交到线程池中：" + task); FutureTask<String> futureTask = new FutureTask<String>( new ThreadPoolTask(task)); threadPoolTaskExecutor.execute(futureTask); // 在这里可以做别的任何事情 String result = null; try { // 取得结果，同时设置超时执行时间为0.1秒。同样可以用future.get()，不设置执行超时时间取得结果 result = futureTask.get(); } catch (InterruptedException e) { futureTask.cancel(true); } catch (ExecutionException e) { futureTask.cancel(true); } catch (Exception e) { futureTask.cancel(true); // 超时后，进行相应处理 } finally { System.out.println("task@" + i + ":result=" + result); }}

SPRING配置文件

<?xml version="1.0" encoding="UTF-8" ?><beans xmlns="http://.paul.threadPool;import java.util.concurrent.ArrayBlockingQueue;import java.util.concurrent.ThreadPoolExecutor;import java.util.concurrent.TimeUnit;import org.junit.Test;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;import org.springframework.test.context.ContextConfiguration;import org.springframework.test.context.junit4.AbstractJUnit4SpringContextTests;@ContextConfigurationpublic class TestThreadPool extends AbstractJUnit4SpringContextTests{ private static int produceTaskSleepTime = 10; private static int produceTaskMaxNumber = 1000; @Autowired private ThreadPoolTaskExecutor threadPoolTaskExecutor; public ThreadPoolTaskExecutor getThreadPoolTaskExecutor() { return threadPoolTaskExecutor; } public void setThreadPoolTaskExecutor( ThreadPoolTaskExecutor threadPoolTaskExecutor) { this.threadPoolTaskExecutor = threadPoolTaskExecutor; } @Test public void testThreadPoolExecutor() { // 构造一个线程池 final ThreadPoolExecutor threadPool = new ThreadPoolExecutor(2, 4, 600, TimeUnit.SECONDS, new ArrayBlockingQueue<Runnable>(3), new ThreadPoolExecutor.CallerRunsPolicy()); for (int i = 1; i <= produceTaskMaxNumber; i++) { try { Thread.sleep(produceTaskSleepTime); } catch (InterruptedException e1) { e1.printStackTrace(); } new Thread(new StartTaskThread(threadPoolTaskExecutor,i)).start(); } }}

项目截图(基于maven构建)

运行截图：

如果遇到cpu忙执行超过1秒的会返回null

总结

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