Listener中引入service



       一直对于web.xml文件没啥研究，不是很清楚里边的加载顺序，直到最近要做个web端实时提醒问题来了，时时提醒是在Listener中，这里边引入service报错，提示service为null，查找到了好多方法都一直没法解决，中间走了好多弯路，知道最后在其他的同事的帮忙下解决了，还是上代码吧。

package com.eagle.listener;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpSessionAttributeListener;
import javax.servlet.http.HttpSessionBindingEvent;
import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;

import org.comet4j.core.CometContext;
import org.comet4j.core.CometEngine;
import org.springframework.context.ApplicationContext;
import org.springframework.web.context.ContextLoaderListener;
import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;

import com.eagle.pojo.TblBusinesswaste;
import com.eagle.service.BusService;
import com.eagle.service.LoginService;
import com.eagle.service.QueryInfoService;

//实时通知
public class NoticeListener extends ContextLoaderListener  implements ServletContextListener, HttpSessionListener,HttpSessionAttributeListener {
 private static final String CHANNEL = "hello";
 ServletContext application = null ;
 BusService busService;
 List<TblBusinesswaste> list = new ArrayList<TblBusinesswaste>();
 public void contextDestroyed(ServletContextEvent sce) {
 }
 
 public void contextInitialized(ServletContextEvent sce) {
  //super.contextInitialized(sce) ;
  this.application = sce.getServletContext() ;
  ApplicationContext ctx = WebApplicationContextUtils.getRequiredWebApplicationContext(application) ;
  busService = (BusService) ctx.getBean("busService");
  CometContext cc = CometContext.getInstance();
        cc.registChannel(CHANNEL);//注册应用的channel
        Thread myThread = new Thread(new MyThread(), "Sender App Module");
        myThread.setDaemon(true);
        myThread.start();
 }
 
 class MyThread implements Runnable {
  List<TblBusinesswaste> lists = new ArrayList<TblBusinesswaste>();
            public void run() {
                    while (true) {
                            try {
                                    Thread.sleep(10000);
                            } catch (Exception ex) {
                                    ex.printStackTrace();
                            }
                            CometEngine engine = CometContext.getInstance().getEngine();
                            engine.sendToAll(CHANNEL, Runtime.getRuntime().freeMemory()/1024);
                    }
            }
    }
 
 @Override
 public void sessionCreated(HttpSessionEvent arg0) {
  // TODO Auto-generated method stub
  
 }

 @Override
 public void sessionDestroyed(HttpSessionEvent arg0) {
  // TODO Auto-generated method stub
  
 }

 @Override
 public void attributeAdded(HttpSessionBindingEvent arg0) {
  // TODO Auto-generated method stub
  
 }

 @Override
 public void attributeRemoved(HttpSessionBindingEvent arg0) {
  // TODO Auto-generated method stub
  
 }

 @Override
 public void attributeReplaced(HttpSessionBindingEvent arg0) {
  // TODO Auto-generated method stub
  
 }

 public ServletContext getApplication() {
  return application;
 }

 public void setApplication(ServletContext application) {
  this.application = application;
 }
 
}

application.xml中就配置service的bean即可；

web.xml中配置
<listener>
  <listener-class>com.eagle.listener.NoticeListener</listener-class>
 </listener>

在此之前需要配置

<listener>
  <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
 </listener>

即可。