ThreadPoolTaskExecutor

一、线程池配置方式

ThreadPoolTaskExecutor 是 Spring 的线程池技术,利用它可以轻松的实现线程池。具体可参照 ThreadPoolExecutor

1️⃣xml 配置方式

pom.xml:

<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-context-support</artifactId>
  <version>3.0.5.RELEASE</version>
</dependency> 

applicationContext.xml:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "/spring-beans.dtd">
<beans>

    <bean id="taskExecutor" 
      class="org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor">
        <!--核心线程数 -->
        <property name="corePoolSize" value="5"/>
        <!-- 线程池维护线程所允许的空闲时间 -->
        <property name="keepAliveSeconds" value="3000"/>
        <!--最大线程数 -->
        <property name="maxPoolSize" value="10"/>
        <!-- 队列大小 -->
        <property name="queueCapacity" value="1000"/>
        <!-- 线程池对拒绝任务(无线程可用)的处理策略 -->
        <property name="rejectedExecutionHandler">
            <!-- AbortPolicy:直接抛出java.util.concurrent.RejectedExecutionException异常 -->
            <!-- CallerRunsPolicy:主线程直接执行该任务,执行完之后尝试添加下一个任务到线程池中,
                  可以有效降低向线程池内添加任务的速度 -->
            <!-- DiscardOldestPolicy:抛弃旧的任务、暂不支持;会导致被丢弃的任务无法再次被执行 -->
            <!-- DiscardPolicy:抛弃当前任务、暂不支持;会导致被丢弃的任务无法再次被执行 -->
            <bean class="java.util.concurrent.ThreadPoolExecutor$DiscardPolicy"/>
        </property>
    </bean>

</beans>

2️⃣配置类方式

@Configuration
public class ExecturConfig {
    @Bean("taskExector")
    public Executor taskExector() {
 
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        int i = Runtime.getRuntime().availableProcessors();//获取到服务器的cpu内核
        executor.setCorePoolSize(5);//核心池大小
        executor.setMaxPoolSize(100);//最大线程数
        executor.setQueueCapacity(1000);//队列程度
        executor.setKeepAliveSeconds(1000);//线程空闲时间
        executor.setThreadNamePrefix("tsak-asyn");//线程前缀名称
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.AbortPolicy());//配置拒绝策略
        return executor;
    }

二、使用

@Resource(name="taskExecutor")
ThreadPoolTaskExecutor taskExecutor;
@AutoWired
ThreadPoolTaskExecutor taskExecutor
public class SpringThread extends Thread{
 
    private int parameter;
    public SpringThread(int parameter){
        this.parameter = parameter;
    }
    @Override
    public void run() {
        System.out.println(Thread.currentThread().getName() + ":执行了..." + parameter);
        try {
            Thread.sleep(10000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

测试:

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.core.task.TaskExecutor;
 
public class App {
    public static void main( String[] args ) {
         ApplicationContext appContext = 
            new ClassPathXmlApplicationContext("file:applicationContext.xml");
        TaskExecutor executor = (TaskExecutor) appContext.getBean("taskExecutor");
        for (int i = 0; i < 10; i++) {
            SpringThread t = new SpringThread(i);
            executor.execute(t);
        }
        System.out.println("main process is finish .....");
    }
}

结果:

taskExecutor-1:执行了...0
taskExecutor-2:执行了...1
taskExecutor-3:执行了...2
taskExecutor-4:执行了...3
taskExecutor-5:执行了...4
main process is finish .....
taskExecutor-1:执行了...5
taskExecutor-3:执行了...7
taskExecutor-4:执行了...8
taskExecutor-2:执行了...6
taskExecutor-5:执行了...9

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