Spring线程池结合Spring托管线程Bean
@Component 注释声明Spring的托管Bean
@Scope("prototype") 注释说明为“多例”
package com.test.thread; import org.springframework.context.annotation.Scope; import org.springframework.stereotype.Component; @Component @Scope("prototype") public class PrintTask 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."); } }
package com.test.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 // 表示所扫描所包含的@Bean @ComponentScan(basePackages="com.test.thread") public class AppConfig { @Bean public ThreadPoolTaskExecutor taskExecutor(){ ThreadPoolTaskExecutor pool = new ThreadPoolTaskExecutor(); pool.setCorePoolSize(5); //线程池活跃的线程数 pool.setMaxPoolSize(10); //线程池最大活跃的线程数 pool.setQueueCapacity(25); // 队列的最大容量 pool.setWaitForTasksToCompleteOnShutdown(true); return pool; } }
package com.test; 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.PrintTask; public class App { public static void main(String[] args) { ApplicationContext ctx = new AnnotationConfigApplicationContext(AppConfig.class); ThreadPoolTaskExecutor taskExecutor = (ThreadPoolTaskExecutor)ctx.getBean("taskExecutor"); PrintTask2 printTask1 = (PrintTask2)ctx.getBean("printTask"); printTask1.setName("Thread 1"); taskExecutor.execute(printTask1); PrintTask2 printTask2 = (PrintTask2)ctx.getBean("printTask"); printTask2.setName("Thread 2"); taskExecutor.execute(printTask2); PrintTask2 printTask3 = (PrintTask2)ctx.getBean("printTask"); 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; } } } }
备注:如PrintTask类中有操作dao,service中的数据库@Autowired找不到类,那就要注意@ComponentScan(basePackages="com.test.thread")是否有问题了~应包含全部@Bean包的最底级别。
Spring线程池结合非Spring托管Bean。
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
<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>
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; } } } }
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。
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."); } }
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(); } }
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 { }
锁依赖的jar
org.springframework.aop-3.1.3.RELEASE.jar
org.springframework.asm-3.1.3.RELEASE.jar
org.springframework.beans-3.1.3.RELEASE.jar
org.springframework.context-3.1.3.RELEASE.jar
org.springframework.core-3.1.3.RELEASE.jar
org.springframework.expression-3.1.3.RELEASE.jar
commons-logging.jar
aopalliance-1.0.jar
asm-3.3.1.jar
cglib-2.2.2.jar
另外附上线程池属性,作用等你发掘,欢迎拍砖~
protected edu.emory.mathcs.backport.java.util.concurrent.BlockingQueue createQueue(int queueCapacity) //Create the BlockingQueue to use for the ThreadPoolExecutor. void destroy() //Calls shutdown when the BeanFactory destroys the task executor instance. void execute(Runnable task) //Implementation of both the JSR-166 backport Executor interface and the Spring TaskExecutor interface, delegating to the ThreadPoolExecutor instance. int getActiveCount() //Return the number of currently active threads. int getCorePoolSize() //Return the ThreadPoolExecutor's core pool size. int getKeepAliveSeconds() //Return the ThreadPoolExecutor's keep-alive seconds. int getMaxPoolSize() //Return the ThreadPoolExecutor's maximum pool size. int getPoolSize() //Return the current pool size. edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor getThreadPoolExecutor() //Return the underlying ThreadPoolExecutor for native access. void initialize() //Creates the BlockingQueue and the ThreadPoolExecutor. boolean prefersShortLivedTasks() //This task executor prefers short-lived work units. void setAllowCoreThreadTimeOut(boolean allowCoreThreadTimeOut) //Specify whether to allow core threads to time out. void setBeanName(String name) //Set the name of the bean in the bean factory that created this bean. void setCorePoolSize(int corePoolSize) //Set the ThreadPoolExecutor's core pool size. void setKeepAliveSeconds(int keepAliveSeconds) //Set the ThreadPoolExecutor's keep-alive seconds. void setMaxPoolSize(int maxPoolSize) //Set the ThreadPoolExecutor's maximum pool size. void setQueueCapacity(int queueCapacity) //Set the capacity for the ThreadPoolExecutor's BlockingQueue. void setRejectedExecutionHandler(edu.emory.mathcs.backport.java.util.concurrent.RejectedExecutionHandler rejectedExecutionHandler) //Set the RejectedExecutionHandler to use for the ThreadPoolExecutor. void setThreadFactory(edu.emory.mathcs.backport.java.util.concurrent.ThreadFactory threadFactory) //Set the ThreadFactory to use for the ThreadPoolExecutor's thread pool. void setThreadNamePrefix(String threadNamePrefix) //Specify the prefix to use for the names of newly created threads. void setWaitForTasksToCompleteOnShutdown(boolean waitForJobsToCompleteOnShutdown) //Set whether to wait for scheduled tasks to complete on shutdown. void shutdown() //Perform a shutdown on the ThreadPoolExecutor.