Spring线程池开发实战

Spring线程池开发实战

原文出处：点击打开链接

作者：chszs，转载需注明。

作者博客主页：http://blog.youkuaiyun.com/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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1. package com.chszs.thread;  
2.   
3. import org.springframework.stereotype.Component;  
4. import org.springframework.context.annotation.Scope;  
5.   
6. @Component  
7. @Scope("prototype")  
8. public class PrintThread extends Thread{  
9.         @Override  
10.         public void run(){  
11.                 System.out.println(getName() + " is running.");  
12.                 try{  
13.                         Thread.sleep(5000);  
14.                 }catch(InterruptedException e){  
15.                         e.printStackTrace();  
16.                 }  
17.                 System.out.println(getName() + " is running again.");  
18.         }  
19. }  

AppConfig.java

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1. package com.chszs.config;  
2.   
3. import org.springframework.context.annotation.ComponentScan;  
4. import org.springframework.context.annotation.Configuration;  
5.   
6. @Configuration  
7. @ComponentScan(basePackages="com.chszs.thread")  
8. public class AppConfig {  
9. }  

App.java

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1. package com.chszs;  
2. import org.springframework.context.ApplicationContext;  
3. import org.springframework.context.annotation.AnnotationConfigApplicationContext;  
4.   
5. import com.chszs.config.AppConfig;  
6. import com.chszs.thread.PrintThread;  
7.   
8. public class App {  
9.         public static void main(String[] args){  
10.                 ApplicationContext ctx =   
11.             new AnnotationConfigApplicationContext(AppConfig.class);  
12.                 PrintThread printThread1 = (PrintThread)ctx.getBean("printThread");  
13.                 printThread1.setName("Thread 1");  
14.                   
15.                 PrintThread printThread2 = (PrintThread)ctx.getBean("printThread");  
16.                 printThread2.setName("Thread 2");  
17.                   
18.                 PrintThread printThread3 = (PrintThread)ctx.getBean("printThread");  
19.                 printThread3.setName("Thread 3");  
20.                   
21.                 PrintThread printThread4 = (PrintThread)ctx.getBean("printThread");  
22.                 printThread4.setName("Thread 4");  
23.                   
24.                 PrintThread printThread5 = (PrintThread)ctx.getBean("printThread");  
25.                 printThread5.setName("Thread 5");  
26.                   
27.                 printThread1.start();  
28.                 printThread2.start();  
29.                 printThread3.start();  
30.                 printThread4.start();  
31.                 printThread5.start();  
32.         }  
33. }  

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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1. package com.chszs.thread;  
2.   
3. public class PrintTask implements Runnable{  
4.         String name;  
5.         public PrintTask(String name){  
6.                 this.name = name;  
7.         }  
8.         @Override  
9.         public void run() {  
10.                 System.out.println(name + " is running.");  
11.                 try{  
12.                         Thread.sleep(5000);  
13.                 }catch(InterruptedException e){  
14.                         e.printStackTrace();  
15.                 }  
16.                 System.out.println(name + " is running again.");  
17.         }  
18.           
19. }  

Spring-Config.xml

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1. <beans xmlns="http://www.springframework.org/schema/beans"  
2.         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"   
3.         xmlns:context="http://www.springframework.org/schema/context"  
4.         xsi:schemaLocation="http://www.springframework.org/schema/beans  
5.         http://www.springframework.org/schema/beans/spring-beans-3.1.xsd  
6.         http://www.springframework.org/schema/context  
7.         http://www.springframework.org/schema/context/spring-context-3.1.xsd">  
8.           
9.         <bean id="taskExecutor"   
10.         class="org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor">  
11.                 <property name="corePoolSize" value="5" />  
12.                 <property name="maxPoolSize" value="10" />  
13.                 <property name="WaitForTasksToCompleteOnShutdown" value="true" />  
14.         </bean>  
15. </beans>  

注意这个Spring配置文件的位置，如图所示：

App1.java

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1. package com.chszs;  
2.   
3. import org.springframework.context.ApplicationContext;  
4. import org.springframework.context.support.ClassPathXmlApplicationContext;  
5. import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;  
6.   
7. import com.chszs.thread.PrintTask;  
8.   
9. public class App1 {  
10.   
11.         public static void main(String[] args) {  
12.                 ApplicationContext ctx =   
13.             new ClassPathXmlApplicationContext("resources/Spring-Config.xml");  
14.                 ThreadPoolTaskExecutor taskExecutor =  
15.             (ThreadPoolTaskExecutor)ctx.getBean("taskExecutor");  
16.                 taskExecutor.execute(new PrintTask("Thread 1"));  
17.                 taskExecutor.execute(new PrintTask("Thread 2"));  
18.                 taskExecutor.execute(new PrintTask("Thread 3"));  
19.                 taskExecutor.execute(new PrintTask("Thread 4"));  
20.                 taskExecutor.execute(new PrintTask("Thread 5"));  
21.                 // 检查活动的线程，如果活动线程数为0则关闭线程池  
22.                 for(;;){  
23.                         int count = taskExecutor.getActiveCount();  
24.                         System.out.println("Active Threads : " + count);  
25.                         try{  
26.                                 Thread.sleep(1000);  
27.                         }catch(InterruptedException e){  
28.                                 e.printStackTrace();  
29.                         }  
30.                         if(count==0){  
31.                                 taskExecutor.shutdown();  
32.                                 break;  
33.                         }  
34.                 }  
35.         }  
36.   
37. }  

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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1. package com.chszs.thread;  
2.   
3. import org.springframework.context.annotation.Scope;  
4. import org.springframework.stereotype.Component;  
5.   
6. @Component  
7. @Scope("prototype")  
8. public class PrintTask2 implements Runnable {  
9.         String name;  
10.   
11.         public void setName(String name) {  
12.                 this.name = name;  
13.         }  
14.           
15.         @Override  
16.         public void run(){  
17.                 System.out.println(name + " is running.");  
18.                 try{  
19.                         Thread.sleep(5000);  
20.                 }catch(InterruptedException e){  
21.                         e.printStackTrace();  
22.                 }  
23.                 System.out.println(name + " is running again.");  
24.         }  
25. }  

AppConfig.java

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1. package com.chszs.config;  
2.   
3. import org.springframework.context.annotation.Bean;  
4. import org.springframework.context.annotation.ComponentScan;  
5. import org.springframework.context.annotation.Configuration;  
6. import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;  
7.   
8. @Configuration  
9. @ComponentScan(basePackages="com.chszs.thread")  
10. public class AppConfig {  
11.         @Bean  
12.         public ThreadPoolTaskExecutor taskExecutor(){  
13.                 ThreadPoolTaskExecutor pool = new ThreadPoolTaskExecutor();  
14.                 pool.setCorePoolSize(5);  
15.                 pool.setMaxPoolSize(10);  
16.                 pool.setWaitForTasksToCompleteOnShutdown(true);  
17.                 return pool;  
18.         }  
19. }  

App2.java

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1. package com.chszs;  
2.   
3. import org.springframework.context.ApplicationContext;  
4. import org.springframework.context.annotation.AnnotationConfigApplicationContext;  
5. import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;  
6.   
7. import com.chszs.config.AppConfig;  
8. import com.chszs.thread.PrintTask2;  
9.   
10. public class App2 {  
11.         public static void main(String[] args) {  
12.                 ApplicationContext ctx =   
13.             new AnnotationConfigApplicationContext(AppConfig.class);  
14.                 ThreadPoolTaskExecutor taskExecutor =  
15.             (ThreadPoolTaskExecutor)ctx.getBean("taskExecutor");  
16.                   
17.                 PrintTask2 printTask1 = (PrintTask2)ctx.getBean("printTask2");  
18.                 printTask1.setName("Thread 1");  
19.                 taskExecutor.execute(printTask1);  
20.                   
21.                 PrintTask2 printTask2 = (PrintTask2)ctx.getBean("printTask2");  
22.                 printTask2.setName("Thread 2");  
23.                 taskExecutor.execute(printTask2);  
24.                   
25.                 PrintTask2 printTask3 = (PrintTask2)ctx.getBean("printTask2");  
26.                 printTask3.setName("Thread 3");  
27.                 taskExecutor.execute(printTask3);  
28.                   
29.                 for(;;){  
30.                         int count = taskExecutor.getActiveCount();  
31.                         System.out.println("Active Threads : " + count);  
32.                         try{  
33.                                 Thread.sleep(1000);  
34.                         }catch(InterruptedException e){  
35.                                 e.printStackTrace();  
36.                         }  
37.                         if(count==0){  
38.                                 taskExecutor.shutdown();  
39.                                 break;  
40.                         }  
41.                 }  
42.         }  
43.   
44. }  

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！！