<%@ page language= "java" import= "java.util.*" pageencoding= "gb2312"%>
<! DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" >
<title>ajax verifying that the username exists </TITLE>
<script>
Set a variable
var Xmlhttpreq=false;
Create a XMLHttpRequest Object
function Createxmlhttprequest () {
if (window. XMLHttpRequest) {//mozilla
Xmlhttpreq=new XMLHttpRequest ();
}
else if (window. ActiveXObject) {
try{
Xmlhttpreq=new ActiveXObject ("msxml2.xmlhttp");
}catch (e) {
try{
Xmlhttpreq=new ActiveXObject ("Microsoft.XMLHTTP");
}catch (e) {}
}
}
}
Send Request function
function Send (URL) {
Createxmlhttprequest ();
Xmlhttpreq.open ("Get", url,true);
Xmlhttpreq.onreadystatechange=proce; function that specifies the response
Xmlhttpreq.send (NULL); Send Request
}
function Proce () {
if (xmlhttpreq.readystate==4) {//object state
if (xmlhttpreq.status==200) {//information has been successfully returned to start processing information
<!--test read XML start-up
var root=xmlhttpreq.responsexml;
var res=root.getelementsbytagname ("Content") [0].firstchild.data;
Window.alert (RES);
<!--test reads end of XML--
var xmlreturn = Xmlhttpreq.responsetext;
Window.alert (Xmlreturn);
}else{
Window.alert ("The requested page has an exception");
}
}
}
Identity verification
function Check () {
var Name=document.getelementbyid ("name"). Value;
if (name== "") {
Alert ("Please enter your name!");
return false;
}
else{
Send (' login?name= ' +name);
document.getElementById ("Load"). style.display= ';
Send (' login.do?name= ' +name);
document.getElementById ("Load"). style.display= ' None ';
}
}
</script>
<body>
<form action= "Login" method= "POST" >
<table>
<tr><td> Name: <input id= "name" type= "text" name= "name"/><p>
<div id=load style= "Display:none; Position:absolute;right:0px;top:0px;background: #FF5B5B; border:1px solid "> Verifying your username, please ......</div><p> later
<input type= "button" value= "Detect!" onclick= "check ()"/>
</td>
</tr>
</table>
</form>
</body>
Structs-config configuration:
<?xml version= "1.0" encoding= "UTF-8"?>
<! DOCTYPE struts-config Public "-//apache software foundation//dtd struts Configuration 1.2//en" "/http Struts.apache.org/dtds/struts-config_1_2.dtd ">
<struts-config>
<data-sources/>
<form-beans >
<form-bean name= "LoginForm" type= "Org.viman.struts.form.LoginForm"/>
</form-beans>
<global-exceptions/>
<global-forwards/>
<action-mappings >
<action
Attribute= "LoginForm"
input= "/login.jsp"
Name= "LoginForm"
Path= "/login"
Scope= "Request"
Type= "Org.viman.struts.action.LoginAction"/>
</action-mappings>
<message-resources parameter= "Org.viman.struts.ApplicationResources"/>
</struts-config>
Action Implementation (Loginaction.java):
Package org.viman.struts.action;
Import java.io.UnsupportedEncodingException;
Import Javax.servlet.http.HttpServletRequest;
Import Javax.servlet.http.HttpServletResponse;
Import org.apache.struts.action.Action;
Import Org.apache.struts.action.ActionForm;
Import Org.apache.struts.action.ActionForward;
Import org.apache.struts.action.ActionMapping;
Import Org.viman.struts.form.LoginForm;
/**
* MyEclipse Struts
* Creation date:01-06-2007
*
* XDoclet Definition:
* @struts. Action path= "/login" name= "LoginForm" input= "/login.jsp" scope= "Request" validate= "true"
*/
public class Loginaction extends Action {
/*
* Generated Methods
*/
/**
* Method Execute
* @param mapping
* @param form
* @param request
* @param response
* @return Actionforward
*/
Public Actionforward Execute (actionmapping mapping, Actionform form,
HttpServletRequest request, HttpServletResponse response) {
LoginForm loginform = (loginform) form;//TODO auto-generated Method stub
try {
Request.setcharacterencoding ("gb2312");
} catch (Unsupportedencodingexception e) {
E.printstacktrace ();
}
try{
String msgstr= "";
Response.setcontenttype ("text/xml;charset=gb2312");
Response.setheader ("Cache-control", "No-cache");
String Name= (String) request.getparameter ("name");
System.out.println ("name =" +name);
if ("Gong". Equals (name)) {//Check the database for the user name
MSGSTR = "Sorry, this user name already exists, please change the username registration!";
}else{
MSGSTR = "User not registered, can use!";
}
Response.getwriter (). println ("<?xml version= ' 1.0 ' encoding= ' GB2312 '?> ');
Response.getwriter (). println ("<root>");
Response.getwriter (). println ("<content>");
Response.getwriter (). print (MSGSTR);
Response.getwriter (). println ("</content>");
Response.getwriter (). println ("</root>");
Response.getwriter (). Close ();
}catch (Exception ex) {
}
return null;
}
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