<%@ page contentType="text/html; charset=GB2312" %>
<%@ page import="com.opensymphony.user.UserManager,		 java.util.Collection,		 java.util.Iterator,                 com.opensymphony.user.EntityNotFoundException,                 com.opensymphony.user.User,                 com.opensymphony.user.Group"%><%	String username = request.getParameter("u");	String password = request.getParameter("p");	String g = request.getParameter("g");		UserManager um = UserManager.getInstance();	User ExistUser=null;	Collection users = um.getUsers();	//判斷用戶是否已經存在	for (Iterator iterator = users.iterator(); iterator.hasNext();)	{		User user = (User) iterator.next();		if(user.getName().equals(username)){			ExistUser=user;			break;		}	}    	if(ExistUser==null){//用戶不存在			User loginuser = um.createUser(username);		loginuser.setPassword(password);				Collection groups = um.getGroups();		//boolean bAdd=false;		Group logingroup=null;		//判斷組是否存在		for (Iterator iterator = groups.iterator(); iterator.hasNext();)		{			Group group = (Group) iterator.next();			if(group.getName().equals(g)){				//bAdd=true;				logingroup = group;				break;			}		}		if(logingroup==null)   logingroup = um.createGroup(g);		loginuser.addToGroup(logingroup);				session.setAttribute("username", username);		response.sendRedirect("nav.jsp?un="+username);    	}   	else {//用戶已存   		//如果密碼正確，并且是輸入組的成員	    	if((ExistUser.authenticate(password)) && (ExistUser.inGroup(g))) {		    session.setAttribute("username", username);		    response.sendRedirect("nav.jsp?un="+username);	    	}	    	else	    	    response.sendRedirect("default.jsp?auth_failed=true");   	 }%>