userlist.java

实例大全

package riso.mybook.jsp.c7;
import java.util.*;
/**
*存储在线用户信息的JavaBeans
*自动将久未连线的用户踢出列表
*/
public class userList  {

private HashMap userList; //所有的用户名
private int activeTimeLimit = 600000;//用户最长发呆时间
public userList ()  {  //构造函数
userList = new Hashmap ();
}
public Iterator getUserList ()  { //返回一个迭代器
removeOverdue();
HashMap returnUserList = new HashMap (userList);
Set returnUserIterator = returnUserSet.iterator ();
Return returnUserIterator;
}
public void  updateuser (String userName)  {
Date dateTimeNow = new Date();
Long longTimeNow = dateTimeNow.getTime();
Long longOTimeNow = new Long(longTimeNow);
String newUserName = new String (userName);
userList.put(username,longTimeNow);
}

public boolean isUserOnLine(String userName)  {
removeOverdue();
return userLiat.containKey(userName);
}

public void addUser (String userName)  {
Date dateTimeNow = new Date();
Long longTimeNow = dateTimeNow.getTime ();
Long longOTimeNow = new long (longTimeNow);
String newUserName = new String (userName);
userList.put(username,longOTimeNow);
}

public void removeOverdue ()  {
HashMap temp = new HashMap (userList);
Set nameSet = temp.keySet ();
Iterator nameIterator = nameSet.iterator ();

While (nameIterator.hasNext())  {
String name = (String) (nameIterator.next());
Long longOLastAccessTime = (Long) userList.get(name);
Long longLastAccessTime = longOLastAccessTime.longValue();

Date dateTimeNow = new Date ();
Long longTimeNow = dateTimeNow.getTime ();
If (longTimeNow - longLastAccessssTime>activeTimeLimit)  {
	userList.remove(name);
}
			}
}

public int getActiveTimeLimit () {
	return activeTimeLimit;
}

public void setActiveTimeLimit(int activeTimeLimit)  {
	this.activeTimeLimit = activeTimeLimit;
}