Spring线程池开发实战

作者：chszs，转载需注明。

作者博客主页：http://blog.csdn.net/chszs

本文提供了三个Spring多线程开发的例子，由浅入深，由于例子一目了然，所以并未做过多的解释。诸位一看便知。

前提条件：

1）在Eclipse创建一个Java项目，我取名为SpringThreadDemo。
2）项目所需的JAR包如图所示：
 

下面开始。

注：项目源码已经托管到GitHub，地址：https://github.com/chszs/SpringThreadDemo

例子1：Spring结合Java线程。

通过继承Thread创建一个简单的Java线程，然后使用@Component让Spring容器管理此线程，Bean的范围必须是prototype，因此每个请求都会返回一个新实例，运行每个单独的线程。

PrintThread.java

package com.chszs.thread;import org.springframework.stereotype.Component;import org.springframework.context.annotation.Scope;@Component@Scope("prototype")public class PrintThread extends Thread{        @Override        public void run(){                System.out.println(getName() + " is running.");                try{                        Thread.sleep(5000);                }catch(InterruptedException e){                        e.printStackTrace();                }                System.out.println(getName() + " is running again.");        }}

AppConfig.java

package com.chszs.config;import org.springframework.context.annotation.ComponentScan;import org.springframework.context.annotation.Configuration;@Configuration@ComponentScan(basePackages="com.chszs.thread")public class AppConfig {}

App.java

package com.chszs;import org.springframework.context.ApplicationContext;import org.springframework.context.annotation.AnnotationConfigApplicationContext;import com.chszs.config.AppConfig;import com.chszs.thread.PrintThread;public class App {        public static void main(String[] args){                ApplicationContext ctx =             new AnnotationConfigApplicationContext(AppConfig.class);                PrintThread printThread1 = (PrintThread)ctx.getBean("printThread");                printThread1.setName("Thread 1");                                PrintThread printThread2 = (PrintThread)ctx.getBean("printThread");                printThread2.setName("Thread 2");                                PrintThread printThread3 = (PrintThread)ctx.getBean("printThread");                printThread3.setName("Thread 3");                                PrintThread printThread4 = (PrintThread)ctx.getBean("printThread");                printThread4.setName("Thread 4");                                PrintThread printThread5 = (PrintThread)ctx.getBean("printThread");                printThread5.setName("Thread 5");                                printThread1.start();                printThread2.start();                printThread3.start();                printThread4.start();                printThread5.start();        }}

输出：

Thread 1 is running.
Thread 2 is running.
Thread 4 is running.
Thread 5 is running.
Thread 3 is running.
Thread 2 is running again.
Thread 1 is running again.
Thread 5 is running again.
Thread 4 is running again.
Thread 3 is running again.

例子2：Spring线程池结合非Spring托管Bean。

使用Spring的ThreadPoolTaskExecutor类创建一个线程池。执行线程无需受Spring容器的管理。

PrintTask.java

package com.chszs.thread;public class PrintTask implements Runnable{        String name;        public PrintTask(String name){                this.name = name;        }        @Override        public void run() {                System.out.println(name + " is running.");                try{                        Thread.sleep(5000);                }catch(InterruptedException e){                        e.printStackTrace();                }                System.out.println(name + " is running again.");        }        }

Spring-Config.xml

<beans xmlns="http://www.springframework.org/schema/beans"        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"         xmlns:context="http://www.springframework.org/schema/context"        xsi:schemaLocation="http://www.springframework.org/schema/beans        http://www.springframework.org/schema/beans/spring-beans-3.1.xsd        http://www.springframework.org/schema/context        http://www.springframework.org/schema/context/spring-context-3.1.xsd">                <bean id="taskExecutor"         class="org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor">                <property name="corePoolSize" value="5" />                <property name="maxPoolSize" value="10" />                <property name="WaitForTasksToCompleteOnShutdown" value="true" />        </bean></beans>

注意这个Spring配置文件的位置，如图所示：

App1.java

package com.chszs;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;import com.chszs.thread.PrintTask;public class App1 {        public static void main(String[] args) {                ApplicationContext ctx =             new ClassPathXmlApplicationContext("resources/Spring-Config.xml");                ThreadPoolTaskExecutor taskExecutor =            (ThreadPoolTaskExecutor)ctx.getBean("taskExecutor");                taskExecutor.execute(new PrintTask("Thread 1"));                taskExecutor.execute(new PrintTask("Thread 2"));                taskExecutor.execute(new PrintTask("Thread 3"));                taskExecutor.execute(new PrintTask("Thread 4"));                taskExecutor.execute(new PrintTask("Thread 5"));                // 检查活动的线程，如果活动线程数为0则关闭线程池                for(;;){                        int count = taskExecutor.getActiveCount();                        System.out.println("Active Threads : " + count);                        try{                                Thread.sleep(1000);                        }catch(InterruptedException e){                                e.printStackTrace();                        }                        if(count==0){                                taskExecutor.shutdown();                                break;                        }                }        }}

输出：

Thread 1 is running.
Thread 2 is running.
Thread 3 is running.
Thread 4 is running.
Active Threads : 4
Thread 5 is running.
Active Threads : 5
Active Threads : 5
Active Threads : 5
Active Threads : 5
Active Threads : 5
Thread 4 is running again.
Thread 2 is running again.
Thread 3 is running again.
Thread 1 is running again.
Thread 5 is running again.
Active Threads : 0

作者：chszs，转载需注明。博客主页：http://blog.csdn.net/chszs

例子3：Spring线程池结合Spring托管Bean。

本例仍然使用ThreadPoolTaskExecutor类，并使用@Component注释声明Spring的托管Bean。
下面的例子PrintTask2是Spring的托管Bean，使用@Autowired注释简化代码。

PrintTask2.java

package com.chszs.thread;import org.springframework.context.annotation.Scope;import org.springframework.stereotype.Component;@Component@Scope("prototype")public class PrintTask2 implements Runnable {        String name;        public void setName(String name) {                this.name = name;        }                @Override        public void run(){                System.out.println(name + " is running.");                try{                        Thread.sleep(5000);                }catch(InterruptedException e){                        e.printStackTrace();                }                System.out.println(name + " is running again.");        }}

AppConfig.java

package com.chszs.config;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.ComponentScan;import org.springframework.context.annotation.Configuration;import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;@Configuration@ComponentScan(basePackages="com.chszs.thread")public class AppConfig {        @Bean        public ThreadPoolTaskExecutor taskExecutor(){                ThreadPoolTaskExecutor pool = new ThreadPoolTaskExecutor();                pool.setCorePoolSize(5);                pool.setMaxPoolSize(10);                pool.setWaitForTasksToCompleteOnShutdown(true);                return pool;        }}

App2.java

package com.chszs;import org.springframework.context.ApplicationContext;import org.springframework.context.annotation.AnnotationConfigApplicationContext;import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;import com.chszs.config.AppConfig;import com.chszs.thread.PrintTask2;public class App2 {        public static void main(String[] args) {                ApplicationContext ctx =             new AnnotationConfigApplicationContext(AppConfig.class);                ThreadPoolTaskExecutor taskExecutor =            (ThreadPoolTaskExecutor)ctx.getBean("taskExecutor");                                PrintTask2 printTask1 = (PrintTask2)ctx.getBean("printTask2");                printTask1.setName("Thread 1");                taskExecutor.execute(printTask1);                                PrintTask2 printTask2 = (PrintTask2)ctx.getBean("printTask2");                printTask2.setName("Thread 2");                taskExecutor.execute(printTask2);                                PrintTask2 printTask3 = (PrintTask2)ctx.getBean("printTask2");                printTask3.setName("Thread 3");                taskExecutor.execute(printTask3);                                for(;;){                        int count = taskExecutor.getActiveCount();                        System.out.println("Active Threads : " + count);                        try{                                Thread.sleep(1000);                        }catch(InterruptedException e){                                e.printStackTrace();                        }                        if(count==0){                                taskExecutor.shutdown();                                break;                        }                }        }}

输出：

Thread 1 is running.
Thread 2 is running.
Active Threads : 2
Thread 3 is running.
Active Threads : 3
Active Threads : 3
Active Threads : 3
Active Threads : 3
Thread 1 is running again.
Thread 2 is running again.
Thread 3 is running again.
Active Threads : 1
Active Threads : 0

从这三个简单的实例中，你是不是发现了Spring框架在多线程方面的强大之处！！