spring线程池ThreadPoolExecutor配置并且得到任务执行的结果

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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

01package com.zuidaima.threadpool;
02 
03import java.io.Serializable;
04import java.util.concurrent.Callable;
05 
06public class ThreadPoolTask implements Callable<String>, Serializable {
07 
08    private static final long serialVersionUID = 0;
09 
10    // 保存任务所需要的数据
11    private Object threadPoolTaskData;
12 
13    private static int consumeTaskSleepTime = 2000;
14 
15    public ThreadPoolTask(Object tasks) {
16        this.threadPoolTaskData = tasks;
17    }
18 
19    public synchronized String call() throws Exception {
20        // 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
21        System.out.println("开始执行任务：" + threadPoolTaskData);
22        String result = "";
23        // //便于观察，等待一段时间
24        try {
25            // long r = 5/0;
26            for (int i = 0; i < 100000000; i++) {
27 
28            }
29            result = "OK";
30        } catch (Exception e) {
31            e.printStackTrace();
32            result = "ERROR";
33        }
34        threadPoolTaskData = null;
35        return result;
36    }
37}

模拟客户端提交的线程

01package com.zuidaima.threadpool;
02 
03import java.util.concurrent.ExecutionException;
04import java.util.concurrent.FutureTask;
05import java.util.concurrent.TimeUnit;
06 
07import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
08 
09public class StartTaskThread implements Runnable {
10 
11    private ThreadPoolTaskExecutor threadPoolTaskExecutor;
12    private int i;
13 
14    public StartTaskThread(ThreadPoolTaskExecutor threadPoolTaskExecutor, int i) {
15        this.threadPoolTaskExecutor = threadPoolTaskExecutor;
16        this.i = i;
17    }
18 
19    @Override
20    public synchronized void run() {
21        String task = "task@ " + i;
22        System.out.println("创建任务并提交到线程池中：" + task);
23        FutureTask<String> futureTask = new FutureTask<String>(
24                new ThreadPoolTask(task));
25        threadPoolTaskExecutor.execute(futureTask);
26        // 在这里可以做别的任何事情
27        String result = null;
28        try {
29            // 取得结果，同时设置超时执行时间为1秒。同样可以用future.get()，不设置执行超时时间取得结果
30            result = futureTask.get(1000, TimeUnit.MILLISECONDS);
31        } catch (InterruptedException e) {
32            futureTask.cancel(true);
33        } catch (ExecutionException e) {
34            futureTask.cancel(true);
35        } catch (Exception e) {
36            futureTask.cancel(true);
37            // 超时后，进行相应处理
38        } finally {
39            System.out.println("task@" + i + ":result=" + result);
40        }
41 
42    }
43}

SPRING配置文件

01<?xml version="1.0" encoding="UTF-8"?>
02<beans xmlns="http://www.springframework.org/schema/beans"
03    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"
04    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context"
05    xsi:schemaLocation="
06        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
07        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
08        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
09        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
10        ">
11    <bean id="threadPoolTaskExecutor"
12        class="org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor">
13 
14        <!-- 核心线程数，默认为1 -->
15        <property name="corePoolSize" value="10" />
16 
17        <!-- 最大线程数，默认为Integer.MAX_VALUE -->
18        <property name="maxPoolSize" value="50" />
19 
20        <!-- 队列最大长度，一般需要设置值>=notifyScheduledMainExecutor.maxNum；默认为Integer.MAX_VALUE
21            <property name="queueCapacity" value="1000" /> -->
22 
23        <!-- 线程池维护线程所允许的空闲时间，默认为60s -->
24        <property name="keepAliveSeconds" value="300" />
25 
26        <!-- 线程池对拒绝任务（无线程可用）的处理策略，目前只支持AbortPolicy、CallerRunsPolicy；默认为后者 -->
27        <property name="rejectedExecutionHandler">
28            <!-- AbortPolicy:直接抛出java.util.concurrent.RejectedExecutionException异常 -->
29            <!-- CallerRunsPolicy:主线程直接执行该任务，执行完之后尝试添加下一个任务到线程池中，可以有效降低向线程池内添加任务的速度 -->
30            <!-- DiscardOldestPolicy:抛弃旧的任务、暂不支持；会导致被丢弃的任务无法再次被执行 -->
31            <!-- DiscardPolicy:抛弃当前任务、暂不支持；会导致被丢弃的任务无法再次被执行 -->
32            <bean class="java.util.concurrent.ThreadPoolExecutor$CallerRunsPolicy" />
33        </property>
34    </bean>
35</beans>

测试类

01package com.zuidaima.test;
02 
03import org.junit.Test;
04import org.junit.runner.RunWith;
05import org.springframework.beans.factory.annotation.Autowired;
06import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
07import org.springframework.test.context.ContextConfiguration;
08import org.springframework.test.context.junit4.AbstractJUnit4SpringContextTests;
09import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
10 
11import com.zuidaima.threadpool.StartTaskThread;
12 
13@RunWith(SpringJUnit4ClassRunner.class)
14// 指定的运行runner，并且把你所指定的Runner作为参数传递给它
15@ContextConfiguration(locations = "classpath*:applicationContext.xml")
16public class TestThreadPool extends AbstractJUnit4SpringContextTests {
17 
18    private static int produceTaskSleepTime = 10;
19 
20    private static int produceTaskMaxNumber = 1000;
21 
22    @Autowired
23    private ThreadPoolTaskExecutor threadPoolTaskExecutor;
24 
25    public ThreadPoolTaskExecutor getThreadPoolTaskExecutor() {
26        return threadPoolTaskExecutor;
27    }
28 
29    public void setThreadPoolTaskExecutor(
30            ThreadPoolTaskExecutor threadPoolTaskExecutor) {
31        this.threadPoolTaskExecutor = threadPoolTaskExecutor;
32    }
33 
34    @Test
35    public void testThreadPoolExecutor() {
36        for (int i = 1; i <= produceTaskMaxNumber; i++) {
37            try {
38                Thread.sleep(produceTaskSleepTime);
39            } catch (InterruptedException e1) {
40                e1.printStackTrace();
41            }
42            new Thread(new StartTaskThread(threadPoolTaskExecutor, i)).start();
43        }
44 
45    }
46 
47}

原文中有些纰漏，我已经修改

项目截图(基于maven构建)

spring线程池ThreadPoolExecutor配置并且得到任务执行的结果

运行截图：

spring线程池ThreadPoolExecutor配置并且得到任务执行的结果

如果遇到cpu忙执行超过1秒的会返回null

spring线程池ThreadPoolExecutor配置并且得到任务执行的结果

原文:http://www.blogjava.net/paulwong/archive/2011/12/07/365773.html

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