我在论坛上搜过了,http://topic.csdn.net/t/20030109/15/1342697.html,这个里面的回答我试了试,但是我的服务器报错是,An error occurred at line: 185 in the jsp file: /jsp/blog.jsp
Generated servlet error:
D:\jakarta-tomcat-5.0.28\work\Catalina\localhost\tomcat\org\apache\jsp\jsp\blog_jsp.java:265: 找不到符号
符号: 类 Vector
位置: 类 org.apache.jsp.jsp.blog_jsp
Vector vt=onlineuser.getOnLineUser();
^
An error occurred at line: 185 in the jsp file: /jsp/blog.jsp
Generated servlet error:
D:\jakarta-tomcat-5.0.28\work\Catalina\localhost\tomcat\org\apache\jsp\jsp\blog_jsp.java:266: 找不到符号
符号: 类 Enumeration
位置: 类 org.apache.jsp.jsp.blog_jsp
Enumeration e=vt.elements();
^
有谁可以指教一下,谢谢了。
Generated servlet error:
D:\jakarta-tomcat-5.0.28\work\Catalina\localhost\tomcat\org\apache\jsp\jsp\blog_jsp.java:265: 找不到符号
符号: 类 Vector
位置: 类 org.apache.jsp.jsp.blog_jsp
Vector vt=onlineuser.getOnLineUser();
^
An error occurred at line: 185 in the jsp file: /jsp/blog.jsp
Generated servlet error:
D:\jakarta-tomcat-5.0.28\work\Catalina\localhost\tomcat\org\apache\jsp\jsp\blog_jsp.java:266: 找不到符号
符号: 类 Enumeration
位置: 类 org.apache.jsp.jsp.blog_jsp
Enumeration e=vt.elements();
^
有谁可以指教一下,谢谢了。
* <p>Title: </p>
*
* <p>Description: </p>
*
* <p>Copyright: Copyright (c) 2006</p>
*
* <p>Company: </p>
*
* @author not attributable
* @version 1.0
*/
import javax.servlet.http.*;
import javax.servlet.*;
import java.util.*;public class onLineUser implements HttpSessionBindingListener {
public onLineUser(){
} private Vector users=new Vector();
public int getCount(){
users.trimToSize();
return users.capacity();
}
public boolean existUser(String userName){
users.trimToSize();
boolean existUser=false;
for (int i=0;i<users.capacity();i++ )
{
if (userName.equals((String)users.get(i)))
{
existUser=true;
break;
}
}
return existUser;
} public boolean deleteUser(String userName) {
users.trimToSize();
if(existUser(userName)){
int currUserIndex=-1;
for(int i=0;i<users.capacity();i++){
if(userName.equals((String)users.get(i))){
currUserIndex=i;
break;
}
}
if (currUserIndex!=-1){
users.remove(currUserIndex);
users.trimToSize();
return true;
}
}
return false;
} public Vector getOnLineUser()
{
return users;
}
public void valueBound(HttpSessionBindingEvent e) {
users.trimToSize();
if(!existUser(e.getName())){
users.add(e.getName());
System.out.print(e.getName()+"\t 登入到系统\t"+(new Date()));
System.out.println(" 在线用户数为:"+getCount());
}else
System.out.println(e.getName()+"已经存在");
} public void valueUnbound(HttpSessionBindingEvent e) {
users.trimToSize();
String userName=e.getName();
deleteUser(userName);
System.out.print(userName+"\t 退出系统\t"+(new Date()));
System.out.println(" 在线用户数为:"+getCount());
}
}