Hi all
In this thread a post sample program for ur reference.
The following thinks are done.
1. index.jsp - in this page user enter username and password.
2. action class- check username and pasword. if it's same forward to another page else response the error message to index.jsp
But forward the next page doesn't work..
In forward page i read request.getAttribute() , which is set on action class
4 ur review
-------
CODE
index.jsp
---------
<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%><%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
<script type="text/javascript">
function initRequest() {
if (window.XMLHttpRequest) {
return new XMLHttpRequest();
} else if (window.ActiveXObject) {
isIE = true;
return new ActiveXObject("Microsoft.XMLHTTP");
}
}
function ajaxFunction()
{
if (false) { //always false.. don't worry about that..
} else {
var name=document.getElementById('username').value;
var ps=document.getElementById('password').value;
var url = "ajaxtest.do?username="+name+"&password="+ps;
var req = initRequest();
req.onreadystatechange = function() {
if (req.readyState == 4) {
if (req.status == 200) {
alert(req.responseXML);
parseMessage(req.responseXML);
} else if (req.status == 204){
clearTable();
}
}
};
req.open("GET", url, true);
req.send(null);
}
}
function parseMessage(responseXML) {
var message = responseXML.getElementsByTagName("message")[0];
setMessage(message.childNodes[0].nodeValue);
}
function setMessage(message) {
var mdiv = document.getElementById("status");
if (message == "invalid") {
mdiv.innerHTML = "<div style=\"color:red\">Invalid User Id</ div>";
}
if (message == "Success")
{
// mdiv.innerHTML = "<div style=\"color:green\">Valid User Id</ div>";
document.location="test.jsp"
}
}
</script>
</head>
<body>
<form name="ajax">
<div id="status">
</div>
User Name : <input type="text" name="username" id="username" > <br>
Password : <input type="password" name="password" id="password" > <br>
Upload : <input type="file" ><br />
<input type="button" onclick="ajaxFunction();" value="Click">
</form>
</body>
</html>
Action class
------------
CODE
/*
* Generated by MyEclipse Struts
* Template path: templates/java/JavaClass.vtl
*/
package com.dckap.ajax.action;
import java.io.PrintWriter;
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;
/**
* MyEclipse Struts Creation date: 08-14-2008
*
* XDoclet definition:
*
* @struts.action validate="true"
*/
public class AjaxtestAction 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) {
// TODO Auto-generated method stub
System.out.println("ajax test execute successyully");
try
{
String userName=request.getParameter("username");
String pwd=request.getParameter("password");
System.out.println("userName="+userName +" password="+pwd);
String err="";
if(userName.equalsIgnoreCase(pwd))
{
err=errorMessage("Success");
request.setAttribute("authorname",userName); //authorname pass to another jsp
return mapping.findForward("success"); // struts config- mapping to test.jsp
}
else
{
err=errorMessage("invalid");
}
System.out.println("return not executed");
if(err.length()>0)
{
System.out.println("err="+err);
response.setContentType("text/xml");
response.setHeader("Cache-Control", "no-cache");
response.getWriter().write(err);
}
}
catch(Exception ie)
{
}
return null;
}
public String errorMessage(String err)
{
return "<message>"+err+"</message>";
}
}
test.jsp
--------
CODE
<body>
This is my JSP page.
<%= request.getAttribute("authorname") %> // read the login user name
<br>
</body>
but i executed the code above. Username and password mismatch i got the error message response. but if it's true no response(actualy need to redirect to another jsp(test.jsp).
This post has been edited by vibinvictoria: 1 Sep, 2008 - 01:34 AM
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