如何在struts eclipse中使用線程或cronjob在特定時間自動發送每日消息？

Question

請幫我解決這個查詢，我將每天應用在Eclipse中特定的時間自動發送信息，但我很困惑所以給我的建議

Answer 1

使用Quartz 2.1.5 API

<!--Maven Dependency--> 
<dependency> 
    <groupId>org.quartz-scheduler</groupId> 
    <artifactId>quartz</artifactId> 
    <version>2.1.5</version> 
</dependency>' 

爲了整合Struts 2和Quartz 2調度程序，我們必須使用標準的Servlet監聽器來將Quartz API鏈接到Struts。 使用下面的ServletContextListener接口。

QuartzListener.java 

import javax.servlet.ServletContextEvent; 
import javax.servlet.ServletContextListener; 
import org.quartz.CronScheduleBuilder; 
import org.quartz.JobBuilder; 
import org.quartz.JobDetail; 
import org.quartz.Scheduler; 
import org.quartz.Trigger; 
import org.quartz.TriggerBuilder; 
import org.quartz.impl.StdSchedulerFactory; 

/** 
* This class is used for executing quartz job 
* using CronTrigger(Quartz 2.1.5). 
* @author Prabhakar Kumar 
*/ 
public class QuartzListener implements ServletContextListener { 

    @Override 
    public void contextDestroyed(ServletContextEvent arg0) { 
     System.out.println("Destroyed is called."); 
    } 

    @Override 
    public void contextInitialized(ServletContextEvent arg0) { 
     try{ 
      //Set job details. 
      JobDetail job = JobBuilder.newJob(HelloJob.class) 
       .withIdentity("helloJob", "group1").build(); 

      //Set the scheduler timings. 
      Trigger trigger = TriggerBuilder.newTrigger() 
       .withIdentity("cronTrigger", "group1") 
       .withSchedule(CronScheduleBuilder 
        .cronSchedule("0/10 * * * * ?")).build(); 
        //"0/10 * * * * ?"--->here you can put date time day of 
       //week month just read more about Quartz API 
       //Execute the job. 
      Scheduler scheduler = 
       new StdSchedulerFactory().getScheduler(); 
      scheduler.start(); 
      scheduler.scheduleJob(job, trigger); 
     }catch(Exception e){ 
      e.printStackTrace(); 
     }   
    } 
} 

你的調度方法樣子

HelloJob.java 

    import org.quartz.Job; 
    import org.quartz.JobExecutionContext; 
    import org.quartz.JobExecutionException; 

    /** 
    * This class defines a quartz job. 
    * @author Prabhakar Kumar 
    */ 
    public class HelloJob implements Job{ 
     public void execute(JobExecutionContext context) 
       throws JobExecutionException { 
      //Here is your code in this method(Your Logic) 
      System.out.println("Hello World.");  
     } 
    } 

的web.xml看起來像

<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd" > <web-app> <filter> <filter-name>struts2</filter-name> <filter-class> org.apache.struts2.dispatcher.ng. filter.StrutsPrepareAndExecuteFilter </filter-class> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <listener> <listener-class> com.javawithease.business.QuartzListener </listener-class> </listener> </web-app>