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; } } |
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); } } |
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> |
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(); } } } |
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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原文链接:http://www.blogjava.net/paulwong/archive/2011/12/07/365773.html