Get used AJAX and the Post calls a simple Servlet examples.
*************************************** AJAX page code ******** ********
<DOCTYPE html PUBLIC "- / / W3C / / DTD XHTML 1.0 Transitional / / EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html Xmlns=" http://www.w3.org/1999/xhtml ">
<head>
<meta Http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title> Untitled document </ title>
<script Language="javascript">
Var xmlHttp;
Function createXMLHttpRequest ()
(
If (window.ActiveXObject)
(
XmlHttp = new ActiveXObject ( "Microsoft.XMLHTTP");
)
Else if (window.XMLHttpRequest)
(
XmlHttp = new XMLHttpRequest ();
)
)
Function createQueryString ()
(
Var firstName = document.getElementById ( "firstname"). Value;
Var middleName = document.getElementById ( "middleName"). Value;
Var birthday = document.getElementById ( "birthday"). Value;
Var queryString = "firstName =" + firstName + "& middleName =" + middleName + "& birthday =" + birthday;
Return queryString;
)
Function doRequestUsingGET ()
(
CreateXMLHttpRequest ();
Var queryString ="../ GetAndPost? ";
QueryString = createQueryString queryString + () + "& timeStamp =" + new Date (). GetTime ();
XmlHttp.onreadystatechange = handleStateChange;
XmlHttp.open ( "GET" queryString, true);
XmlHttp.send (null);
)
Function doRequestUsingPost ()
(
CreateXMLHttpRequest ();
Var url ="../ GetAndPost? TimeStamp = "+ new Date (). GetTime ();
Var queryString = createQueryString ();
XmlHttp.open ( "POST", url, true);
XmlHttp.onreadystatechange = handleStateChange;
XmlHttp.setRequestHeader ( "Content-Type", "application / x-www-form-urlencoded");
XmlHttp.send (queryString);
)
Function handleStateChange ()
(
If (xmlHttp.readyState == 4)
(
If (xmlHttp.status == 200)
(
ParseResults ();
)
)
)
Function parseResults ()
(
Var responseDiv = document.getElementById ( "serverResponse");
If (responseDiv.hasChildNodes ())
(
ResponseDiv.removeChild (responseDiv.childNodes [0]);
)
Var responseText = document.createTextNode (xmlHttp.responseText);
ResponseDiv.appendChild (responseText);
)
</ Script>
</ Head>
<body>
<form Id="form1" name="form1" method="post" action="#">
<p> <br />
<br />
<input Name="firstName" type="text" id="firstName" />
</ P>
<p>
<label>
<input Type="text" name="middleName" id="middleName" />
</ Label>
</ P>
<p>
<input Name="birthday" type="text" id="birthday" />
</ P>
<p> </ P>
<p>
<input Type="button" name="Submit" value="GET" onclick="doRequestUsingGET();"/>
<input Type="button" name="Submit2" value="POST" onclick="doRequestUsingPost();"/>
</ P>
<div Id="serverResponse"> </ div>
</ Form>
</ Body>
</ Html>
*********************************** Servlet code ************* ****
Package temp;
Import java.io. *;
Import java.net .*;
Import javax.servlet .*;
Import javax.servlet.http .*;
Public class GetAndPostExample extends HttpServlet (
Protected void processRequest (HttpServletRequest request, HttpServletResponse response, String method) throws ServletException, IOException
(
Response.setContentType ( "text / xml");
String firstName = request.getParameter ( "firstName");
String middleName = request.getParameter ( "middleName");
String birthday = request.getParameter ( "birthday");
String responseText = "hello:" + firstName + "-" middleName + +. "Your birthday is" + + birthday "." + "[Method:" + method + "]";
PrintWriter out = response.getWriter ();
Out.println (responseText);
Out.close ();
)
Protected void doGet (HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
(
ProcessRequest (request, response, "GET");
)
Protected void doPost (HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
(
ProcessRequest (request, response, "POST");
)
)
The following
