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;
}