📄 confirm.jsp
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<html>
<head>
<title>登录检查</title>
<%@ page session="true" %>
<%@ page contentType="text/html;charset=gb2312" %>
</head>
<body>
<%@ page language="java" %>
<%@ page import="java.util.*" %>
<%@ page import="java.io.*" %>
<%@ page import="javax.servlet.*" %>
<%@ page import="javax.servlet.http.*" %>
<%@ page import="java.sql.*" %>
<jsp:useBean id="reg" scope="page" class="chatreg" />
<%
String regName=(String)request.getParameter("regName");
regName=regName.trim();
String regPassword=(String)request.getParameter("regPassword");
regPassword=regPassword.trim();
String Name=(String)request.getParameter("username");
Name=Name.trim();
String regname=null;
%>
<%
if((regName.length()!=0))
{
String sql="select * from chatreg where username='"+ regName +"' and password='"+ regPassword +"' ";
ResultSet RS = reg.executeQuery(sql);
if(RS.next())
{
regname=regName+"@";
RS.close();
}
else
{
RS.close();
session.putValue("confirm_message", "<center><font color=red><b>错误信息：</b></font><br><font color=blue><b>[用户名或密码错误！]</b></font></center>");
%>
<jsp:forward page="in.jsp"/>
<%
}
}
else
{
if((Name.length()<3)||(Name.length()>8))
{
session.putValue("confirm_message","<center><font color=red><b>错误信息：</b></font><br><font color=blue><b>[你的名字长度必须在3--8之间，谢谢！]</b></font></center>");
%>
<jsp:forward page="in.jsp"/>
<% }
%>
<%
Character c=new Character(' ');
for(int i=0;i<Name.length();i++)
{
if( Name.charAt(i) == c.charValue() )
{
session.putValue("confirm_message","<center><font color=red><b>错误信息：</b></font><br><font color=blue><b>[名字中不能有空格，谢谢！]</b></font></center>");
%>
<jsp:forward page="in.jsp"/>
<%}
}
}
%>
<%
synchronized (application)
{
Vector UserName=null;
UserName= (Vector)application.getAttribute("UserName");
if(UserName==null)
{
UserName= new Vector(30,10);
}
else if(regname!=null )
{
UserName.addElement(regname);
regname=new String(regname.getBytes("iso-8859-1"),"GBK");
session.putValue("Name", regname);
}
else if( UserName.contains(Name))
{
session.putValue("confirm_message","<center><font color=red><b>错误信息：</b></font><br><font color=blue><b>[你的名字已经被别人用了，请换名，谢谢！]</b></font></center>");
%>
<jsp:forward page="in.jsp"/>
<%
}
else
{
UserName.addElement(Name);
Name=new String(Name.getBytes("iso-8859-1"),"GBK");
session.putValue("Name", Name);
}
application.setAttribute("UserName",UserName);
%>
<script language="JavaScript">
window.location="netchat1.jsp"
</script>
<%
}%>
</body>
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