📄 userlogin.jsp
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<%@ page contentType="text/html; charset=gb2312" import="java.sql.*" errorPage="" %>
<html>
<script language=javascript>
function trim(str)
{
// 用正则表达式将前后空格
// 用空字符串替代。
var t = str.replace(/(^\s*)|(\s*$)/g, "");
return t.replace(/(^ *)|( *$)/g, "");
}
function bytelength(szString)
{
return szString.replace(new RegExp("[^\x00-\xff]", "g"), " ").length;
}
function checkPassword(e)
{
var ok = "1234567890qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM_.-";
for(var i=0; i<e.length; i++)
{
if (ok.indexOf(e.charAt(i))<0)
{
return false;
}
}
return true;
}
function validate_form()
{
if(document.form1.name1.value == "")
{
alert("昵称不能为空!");
return false;
}
if(bytelength(document.form1.name1.value)<1||bytelength(document.form1.name1.value)>20)
{
alert("您输入的昵称不合法!");
return false;
}
if(document.form1.name2.value == "")
{
alert("输入密码不能为空!");
return false;
}
if(checkPassword(document.form1.name2.value)==false)
{
alert("您输入的密码不合法!");
return false;
}
return true;
}
function reg()
{
if(validate_form()==false)
return;
validate();
}
var xmlHttp;
function createXMLHttpRequest(){
if(window.ActiveXObject){
xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
}
else if(window.XMLHttpRequest){
xmlHttp=new XMLHttpRequest();
}
}
function validate(){
createXMLHttpRequest();
var name1=document.getElementById("name1").value;
var name2=document.getElementById("name2").value;
var str="name1="+name1+"&name2="+name2;
//alert(str);
var url="LoginAdd.jsp";
xmlHttp.open("POST",url,true);
xmlHttp.onreadystatechange=callback;
xmlHttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
xmlHttp.send(str);
}
function callback(){
if(xmlHttp.readyState==4){
var str=xmlHttp.responseText;
if(trim(str)=="1"){
alert("该用户存在，页面将会转向首页");
window.location ='UserI.jsp';
}
else{
alert("该用户不存在，请确认后再输入");
clear();
}
}
}
function clear(){
document.getElementById("name1").value="";
document.getElementById("name2").value="";
}
</script>
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<TBODY>
<TR>
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<TABLE cellSpacing=0 cellPadding=0 align=right border=0>
<TBODY>
<TR align=right bgColor=#d54016>
<TD><a href="index.jsp"><img height=31 src="skin/youthblog/images/menu_home.gif" width=72 border=0 name=Image_home /></a></TD>
<TD><a href="UserAdd.jsp"><img height=31 src="skin/youthblog/images/menu_regist.gif" width=72 border=0 name=Image_register /></a></TD>
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<TABLE cellSpacing=0 cellPadding=0 width=780 bgColor=#ffffff border=0>
<TBODY>
<TR>
<TD width=10></TD>
<TD width=760>
<body>
<center>
<h3>登录页面</h3>
<form method="post" name="form1" >
<P>用户昵称:<INPUT type="text" id="name1" name="name1" ></P>
<P>用户密码:<INPUT type="password" id="name2" name="name2" ></P>
<P><INPUT type="button" value=" 提交" onclick="reg()">
<INPUT type="reset" value=" 重置 " >
</P>
</form>
<p id='hello'></p>
<div id='empty'></div>
</center>
</TD>
<TD width=10></TD></TR>
<TR>
<TD height=5></TD></TR></TBODY></TABLE>
<TABLE cellSpacing=0 cellPadding=0 width=780 align=center bgColor=#ffffff border=0>
<TBODY>
<TR>
<TD vAlign=top>
<TABLE height=116 cellSpacing=0 cellPadding=0 width=760 align=center border=0>
<TBODY>
<TR>
<TD height=5></TD></TR>
<TR>
<TD bgColor=#cccccc height=10></TD></TR>
<TR>
<TD vAlign=top bgColor=#e8e8e8 height=100>
<TABLE height=89 cellSpacing=0 cellPadding=0 width="100%" border=0>
<TBODY>
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