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 "";
}