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

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://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd">
<!-- 配置数据源 -->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close" p:driverClassName="com.mysql.jdbc.Driver"
p:url="jdbc:mysql://localhost:3306/mb_main?useUnicode=true&characterEncoding=UTF-8&useServerPrepStmts=true" p:username="root" p:password="1234" />
<!-- 配置Jdbc模板 -->
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate"
p:dataSource-ref="dataSource" />
<!-- 事务管理器 -->
<bean id="transactionManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager"
p:dataSource-ref="dataSource" />
<tx:advice id="jdbcTxAdvice" transaction-manager="transactionManager">
<tx:attributes>
<tx:method name="*" />
</tx:attributes>
</tx:advice>
<!-- 使用aop/tx命名空间配置事务管理,这里对service包下的服务类方法提供事务 -->
<aop:config>
<aop:pointcut id="jdbcServiceMethod" expression="within(com.baobaotao.service..*)" />
<aop:advisor pointcut-ref="jdbcServiceMethod" advice-ref="jdbcTxAdvice" />
</aop:config>
<!-- 配置dao
<bean id="loginLogDao" class="com.baobaotao.dao.LoginLogDao"
p:jdbcTemplate-ref="jdbcTemplate" />
<bean id="userDao" class="com.baobaotao.dao.UserDao"
p:jdbcTemplate-ref="jdbcTemplate" />
<bean id="userService" class="com.baobaotao.service.UserService"
p:userDao-ref="userDao" p:loginLogDao-ref="loginLogDao" />
-->
<bean id="threadPoolTaskExecutor" class="org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor">
<!-- 核心线程数，默认为1 -->
<property name="corePoolSize" value="10" />
<!-- 最大线程数，默认为Integer.MAX_VALUE -->
<property name="maxPoolSize" value="50" />
<!-- 队列最大长度，一般需要设置值>=notifyScheduledMainExecutor.maxNum；默认为Integer.MAX_VALUE
<property name="queueCapacity" value="1000" />
-->
<!-- 线程池维护线程所允许的空闲时间，默认为60s -->
<property name="keepAliveSeconds" value="300" />
<!-- 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 -->
<property name="rejectedExecutionHandler">
<!-- AbortPolicy:直接抛出java.util.concurrent.RejectedExecutionException异常 -->
<!-- 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 -->
<!-- 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 -->
<!-- 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 -->
<bean class="java.util.concurrent.ThreadPoolExecutor$CallerRunsPolicy" />
</property>
</bean>
</beans>

测试类

package com.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;
@ContextConfiguration
public 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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