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

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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

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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

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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

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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

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<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

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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

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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

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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

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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！！