java监听器

java监听器：应用正常启动和应用正常结束时，所做的逻辑操作。

 

举例：应用启动时，执行DataSendInitService.init方法

           应用停止时，执行DataSendInitService.destroy方法

 

web.xml配置监听器

<web-app>
 <!-- spring bean的通配符模式配置,其中springconfig/s*/*.xml的s* 是代表你的opcode,如s1100 -->
 <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/applicationContext.xml,/WEB-INF/springconfig/*.xml,/WEB-INF/springconfig/s*/*.xml</param-value>
 </context-param> 

 <listener>
  <listener-class>
   com.sitech.groupcust.common.SystemStartUp
  </listener-class>
 </listener>
 
 <!-- 加载spring上下文环境 -->
    <listener>
      <listener-class>
        com.sitech.groupcust.context.WebContextLoaderListener
     </listener-class>
 </listener>
  <servlet>
        <servlet-name>CXFServlet</servlet-name>
        <display-name>CXF Servlet</display-name>
        <servlet-class>
            org.apache.cxf.transport.servlet.CXFServlet
        </servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>CXFServlet</servlet-name>
        <url-pattern>/ws/*</url-pattern>
    </servlet-mapping>
 </web-app>

扩展的监听器SystemStartUp：

public class SystemStartUp extends ContextLoaderListener{
 public ApplicationContext applicationContext;
 @Override
 public void contextInitialized(ServletContextEvent event) {
  super.contextInitialized(event);  
  applicationContext = WebApplicationContextUtils.getWebApplicationContext(event.getServletContext());
  DataSendInitService.init(applicationContext);
 }
// @Override
// public void contextDestroyed(ServletContextEvent sce) {
//  DataSendInitService.destory(applicationContext);
// }

}

监听操作类DataSendInitService：

public class DataSendInitService{
 public static String sendId;
 public static void destory(ApplicationContext applicationContext) {
  //应用启动时，更新待下发0和下发不成功2的数据组号为空
  QueryuseritemDao queryUserItemDao =(QueryuseritemDao)applicationContext.getBean("QueryuseritemDaoBean");
  queryUserItemDao.deleteSendId(sendId);
  
 }
 public static void init(ApplicationContext applicationContext) {
  String str=System.getProperty("sun.java.command");
  String nodeName=null;
  String serverName=null;
  if(str!=null){
   String[] s=str.split("\\s+");
   nodeName=s[s.length-2];
   serverName=s[s.length-1];
  }else{
   nodeName="defaultNodeName";
   serverName="defaultServerName";
  }
  sendId = nodeName+serverName;
 }