web.xml加入监听器出现异常


package com.myListener;
import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;public class SessionListener implements HttpSessionListener{
static private int activeSession;

public static int getActiveSession(){
return activeSession;
}

public void sessionCreated(HttpSessionEvent se){
activeSession++;
}

public void sessionDestroyed(HttpSessionEvent se){
activeSession--;
}
}package com.myServlet;import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import com.myListener.SessionListener;public class DispHttpSession extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException { response.setContentType("text/html;charset=gb2312");
PrintWriter out = response.getWriter();
out.println("<HTML>");
out.println("  <HEAD><TITLE>myServlet</TITLE></HEAD>");
out.println("  <BODY>");
out.println("<h3>测试监听会话个数");
HttpSession session = request.getSession();
out.println(SessionListener.getActiveSession());
out.println("<form method = post action = '/ServletExample/servlet/OverHttpSession'>");
out.println("<input type = submit value = '会话结束'/>");
out.println("</form>");
out.println("  </BODY>");
out.println("</HTML>");
out.flush();
out.close();
} public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request,response);
}
}
package com.myServlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import com.myListener.SessionListener;public class OverHttpSession extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException { response.setContentType("text/html;charset=gb2312");
PrintWriter out = response.getWriter();
out.println("<HTML>");
out.println("  <HEAD><TITLE>outServlet</TITLE></HEAD>");
out.println("  <BODY>");
out.println("<h3>会话结束");
HttpSession session = request.getSession();
session.invalidate();
out.println(SessionListener.getActiveSession());
out.println("  </BODY>");
out.println("</HTML>");
out.flush();
out.close();
} public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request,response);
}
}web.xml<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
xmlns="http://java.sun.com/xml/ns/javaee" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
 
  <servlet>
    <description>This is the description of my J2EE component</description>
    <display-name>This is the display name of my J2EE component</display-name>
    <servlet-name>DispHttpSession</servlet-name>
    <servlet-class>com.myServlet.DispHttpSession</servlet-class>
  </servlet>
  <servlet>
    <description>This is the description of my J2EE component</description>
    <display-name>This is the display name of my J2EE component</display-name>
    <servlet-name>OverHttpSession</servlet-name>
    <servlet-class>com.myServlet.OverHttpSession</servlet-class>
  </servlet>  <servlet-mapping>
    <servlet-name>DispHttpSession</servlet-name>
    <url-pattern>/servlet/DispHttpSession</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>OverHttpSession</servlet-name>
    <url-pattern>/servlet/OverHttpSession</url-pattern>
  </servlet-mapping>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>在web.xml加入<listener>
           <listener-class>com.myServlet.SessionListener</listener-class>
             </listener>
就出现异常weblogic.application.ModuleException: Failed to load webapp: 'ServletExample'
at weblogic.servlet.internal.WebAppModule.prepare(WebAppModule.java:387)
at weblogic.application.internal.flow.ScopedModuleDriver.prepare(ScopedModuleDriver.java:176)
at weblogic.application.internal.flow.ModuleListenerInvoker.prepare(ModuleListenerInvoker.java:93)
at weblogic.application.internal.flow.DeploymentCallbackFlow$1.next(DeploymentCallbackFlow.java:387)
at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:37)
Truncated. see log file for complete stacktrace
java.lang.ClassNotFoundException: com.myServlet.SessionListener
at weblogic.utils.classloaders.GenericClassLoader.findLocalClass(GenericClassLoader.java:283)
at weblogic.utils.classloaders.GenericClassLoader.findClass(GenericClassLoader.java:256)
at weblogic.utils.classloaders.ChangeAwareClassLoader.findClass(ChangeAwareClassLoader.java:54)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
Truncated. see log file for complete stacktrace
> 请问如何解决?

解决方案 »

  1.   

    java.lang.ClassNotFoundException: com.myServlet.SessionListener
    说没找到com.myServlet.SessionListener
    package com.myListener;
    import javax.servlet.http.HttpSessionEvent;
    import javax.servlet.http.HttpSessionListener;
    ................
      

  2.   

    <listener>
      <listener-class>com.myServlet.SessionListener</listener-class>
    </listener>在WEB.XML里的位置 你放到最前面去。
      

  3.   

    HttpSessionListener??????????????????????????????????????????你實現的接口錯了是 javax.servlet.ServletContextListener
      

  4.   

    是HttpSessionListener没错啊，
    <listener>
      <listener-class>com.myServlet.SessionListener</listener-class>
    </listener>放在最前面也没用
      

  5.   

    明显是包名弄错了
    <listener-class>com.myListener.SessionListener</listener-class>
      

  6.   


    package com.myListener;
    public class SessionListener implements HttpSessionListener{
    ......包錯了？你看看仔細 
    包 com.myListener.下有 SessionListener 這個類的 ，所以包沒錯！！！
    錯的是 他實現的 HttpSessionListener 接口 
    應該是 ServletContextListener 不相信你自己去試下 我已經測試過了。
      

  7.   

    暈
    你的CODE是 正確的 我看你的了  說沒正確 樓主  我只看看不說話。
      

  8.   

    我这个例子是要实现HttpSessionListener这个接口的，我是照老师给的例子打的，而且现在的运行结果没问题！
      

  9.   

    http://www.blogjava.net/baoyaer/articles/152853.html2種LISTENER 區別
      

  10.   

    我了解了，这两种listener我都有在做练习，可能是我之前
    <listener-class>com.myListener.SessionListener</listener-class>
    这里打错了，例子是老师给的，可能也是不太规范吧，谢谢这位兄台，跟你讨论了下，我学了不少！
      

  11.   

    两种Listener都可以，看你是什莫需求。