Spring线程池开发实战

http://www.2cto.com/kf/201211/170841.html

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，
 

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
[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
[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
[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
[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
[html] 
<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
[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

 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
[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
[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
[java] view plaincopyprint?
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！！