Spring线程池之一：由浅入深的3个示例

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。

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

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

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

App.java

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

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

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

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

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

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

转：
http://blog.csdn.net/chszs

posted on 2015-12-16 12:07 duanxz 阅读(1998) 评论(0) 编辑收藏举报