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
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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;
}
}
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模拟客户端提交的线程
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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);
}
}
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spring配置文件
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<?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>
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测试类
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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();
}
}
}
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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
以上就是这篇文章的全部内容了，希望本文的内容对大家的学习或者工作具有一定的参考学习价值，谢谢大家对服务器之家的支持。如果你想了解更多相关内容请查看下面相关链接
原文链接：http://www.blogjava.net/paulwong/archive/2011/12/07/365773.html