关于spring中定时器的使用教程

package org.time; 
 
import java.util.TimerTask; 
 
public class MainTask extends TimerTask{ 
 
 @Override 
 public void run() { 
  System.out.println("检测用户是否掉线"); 
 } 
 
} 

<&＃63;xml version="1.0" encoding="UTF-8"&＃63;> 
 
  
  
 
  
  
   
   
   
   
   
   
  
  
  
   
    
     
    
   
  
 

<&＃63;xml version="1.0" encoding="UTF-8"&＃63;> 
 
  
  
 index.jsp 
  
  
 org.springframework.web.context.ContextLoaderListener 
  
  
 contextConfigLocation 
 /WEB-INF/applicationContext.xml 
  

package org.time; 
 
import org.springframework.scheduling.annotation.Scheduled; 
import org.springframework.stereotype.Component; 
 
@Component 
public class MainTask01{ 
 @Scheduled(cron = "0/3 * * * * &＃63;") 
 public void run() { 
  System.out.println("推送消息来了"); 
 } 
 
} 

<&＃63;xml version="1.0" encoding="UTF-8"&＃63;> 
 
 
  
  
  
  
  
  
 

xmlns:task="http://www.springframework.org/schema/task" 
http://www.springframework.org/schema/task 
http://www.springframework.org/schema/task/spring-task.xsd