enums=ul.getUserList();

int?i=0;

while(enums.hasMoreElements())

{

out.println(enums.nextElement());

out.println("????");

if(++i==10)

{

out.println("

");

}

}

out.println("

當前在線的用戶數："+i);

out.println("

退出登錄");

out.close();

}

}

public?void?doPost(HttpServletRequest?req,?HttpServletResponse?resp)

throws?ServletException,IOException

{

doGet(req,resp);

}

}

***********?LogoutServlet.java?************

package?org.sunxin.lesson.jsp.ch09.online;

import?javax.servlet.*;

import?java.io.*;

import?javax.servlet.http.*;

public?class?LogoutServlet?extends?HttpServlet

{

public?void?doGet(HttpServletRequest?req,?HttpServletResponse?resp)

throws?ServletException,IOException

{

resp.setContentType("text/html;charset=gb2312");

HttpSession?session=req.getSession();

User?user=(User)session.getAttribute("user");

session.invalidate();

PrintWriter?out=resp.getWriter();

out.println("");

out.println(user.getName()+"，你已退出登錄

");

out.println("重新登錄");

out.println("");

out.close();

}

}

***********?User.java?************

package?org.sunxin.lesson.jsp.ch09.online;

import?javax.servlet.http.HttpSessionBindingListener;

import?javax.servlet.http.HttpSessionBindingEvent;

public?class?User?implements?HttpSessionBindingListener

{

private?String?name;

private?UserList?ul=UserList.getInstance();

public?User()

{

}

public?User(String?name)

{

this.name=name;

}

public?void?setName(String?name)

{

this.name=name;

}

public?String?getName()

{

return?name;

}

public?void?valueBound(HttpSessionBindingEvent?event)

{

ul.addUser(name);

}

public?void?valueUnbound(HttpSessionBindingEvent?event)

{

ul.removeUser(name);

}

}

***********?UserList.java?************

package?org.sunxin.lesson.jsp.ch09.online;

import?java.util.Vector;

import?java.util.Enumeration;

public?class?UserList

{

private?static?final?UserList?userList=new?UserList();

private?Vectorv;

private?UserList()

{

v=new?Vector();

}

public?static?UserList?getInstance()

{

return?userList;

}

public?void?addUser(String?name)

{

if(name!=null)

v.addElement(name);

}

public?void?removeUser(String?name)

{

if(name!=null)

v.remove(name);

}

public?EnumerationgetUserList()

{

return?v.elements();

}

public?int?getUserCount()

{

return?v.size();

}

}

****************************

Java代碼的思路是將所有登陸用戶放到集合中。

用戶登陸成功就添加到用戶列表，用戶退出就從用戶列表中移出。

lz?注意User類所實現的接口以及其中以下兩個方法：

//對象被綁定到session中時通知該對象

public?void?valueBound(HttpSessionBindingEvent?event)

{

ul.addUser(name);

}

//從session中刪除對象時通知該對象

public?void?valueUnbound(HttpSessionBindingEvent?event)

{

ul.removeUser(name);

}

【編輯推薦】

【責任編輯：王觀 TEL：(010)68476606】

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