Spring的任务调度@Scheduled注解——task:scheduler和task:executor的解析_task:scheduler task:executor

一个简单的Spring定时任务的 demo，全部代码见下载地址：https://download.csdn.net/download/yx0628/10511753
对于 applicationContext 的配置如下：调度器线程池 task:scheduler 和 task:executor 的意义在后边例子中会详细的测试和说明。

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
                        http://www.springframework.org/schema/beans/spring-beans.xsd
                        http://www.springframework.org/schema/context  
                        http://www.springframework.org/schema/context/spring-context-3.0.xsd
                        http://www.springframework.org/schema/task 
                        http://www.springframework.org/schema/task/spring-task-4.1.xsd"
                        xmlns:task="http://www.springframework.org/schema/task">

    <context:annotation-config />

    <task:annotation-driven scheduler="myScheduler" executor="myExecutor"/>

    <!-- 调度线程池配置 -->
    <task:scheduler id="myScheduler" pool-size="5"/>
    <!-- 执行线程池配置 -->
    <task:executor id="myExecutor" pool-size="5"/>

    <context:component-scan base-package="com.zaimeibian" />

</beans>a
package com.zaimeibian.task;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;

import org.springframework.scheduling.annotation.Async;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

@Component
public class PrintTask {

    DateFormat df = new SimpleDateFormat("HH:mm:ss");

    // 这个Async注解，代表当前任务是要异步执行的
    @Async
    @Scheduled(fixedRate = 5000)
    public void printA(){
        System.out.println("A执行 " + df.format(new Date()));
        try {
            Thread.sleep(10000);
        } catch (InterruptedException e) {
        }
        System
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