Spring线程池开发实战

源：http://blog.csdn.net/chszs/article/details/8219189
评：
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！！