Spring Task定时任务的配置和使用详解

<beans xmlns="http://www.springframework.org/schema/beans" 
  xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"  
  xmlns:p="http://www.springframework.org/schema/p" 
  xmlns:task="http://www.springframework.org/schema/task" 
  xmlns:context="http://www.springframework.org/schema/context" 
  xmlns:aop="http://www.springframework.org/schema/aop"  
  xsi:schemalocation="http://www.springframework.org/schema/beans  
  http://www.springframework.org/schema/beans/spring-beans-4.0.xsd 
  http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd  
  http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-4.0.xsd  
  http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd  
  http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd  
  http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-4.0.xsd"> 

  <task:annotation-driven /> <!-- 定时器开关--> 

  <bean id="mytask" class="com.spring.task.mytask"></bean> 

  <task:scheduled-tasks> 
    <!-- 这里表示的是每隔五秒执行一次 --> 
    <task:scheduled ref="mytask" method="show" cron="*/5 * * * * ?" /> 
    <task:scheduled ref="mytask" method="print" cron="*/10 * * * * ?"/> 
  </task:scheduled-tasks> 

  <!-- 自动扫描的包名 -->
  <context:component-scan base-package="com.spring.task" /> 

</beans>

package com.spring.task; 

/** 
 * 定义任务 
 */ 
public class mytask { 

  public void show() { 
    system.out.println("show method 1"); 
  } 

  public void print() { 
    system.out.println("print method 1"); 
  } 
}

package com.spring.task; 
import org.springframework.scheduling.annotation.scheduled; 
import org.springframework.stereotype.component; 

/**
 * 基于注解的定时器 
 */
@component
public class mytask2 { 

  /**
   * 定时计算。每天凌晨 01:00 执行一次
   */
  @scheduled(cron = "0 0 1 * * *")
  public void show() {
    system.out.println("show method 2"); 
  } 

  /**
   * 启动时执行一次，之后每隔2秒执行一次 
   */
  @scheduled(fixedrate = 1000*2)  
  public void print() { 
    system.out.println("print method 2");
  }
}

<dependency>
   <groupid>org.springframework.boot</groupid>
   <artifactid>spring-boot-starter</artifactid>
</dependency>

@springbootapplication
@enablescheduling
public class application {

 public static void main(string[] args) {
   springapplication.run(application.class, args);
 }

@component
public class mytask3 {

 private int count=0;

 @scheduled(cron="*/6 * * * * ?")
 private void process() {
   system.out.println("this is scheduler task runing "+(count++));
 }
}

@target({elementtype.method, elementtype.annotation_type})
@retention(retentionpolicy.runtime)
@documented
@repeatable(schedules.class)
public @interface scheduled {

  string cron() default "";

  string zone() default "";

  long fixeddelay() default -1;

  string fixeddelaystring() default "";

  long fixedrate() default -1;

  string fixedratestring() default "";

  long initialdelay() default -1;

  string initialdelaystring() default "";
}