Spring线程池

精选转载
ybxywz 2013-08-16 11:21:58
文章标签 java.util.concurrent 文章分类 Java 后端开发
出处：http://www.blogjava.net/paulwong/archive/2011/12/07/365773.html（如存在版权问题，请与我联，系，会马上删除）
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&amp;characterEncoding=UTF-8&amp;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();
 }
 }
}