GET

function doRequestUsingGET() {

　createXMLHttpRequest();

　var queryString = " GetAndPostExample? " ;

　queryString = queryString + createQueryString()+ 
" &timeStamp= " + new Date().getTime();

　xmlHttp.onreadystatechange = handleStateChange;

　xmlHttp.open( " GET " , queryString, true );

　xmlHttp.send( null );

} 

POST

function doRequestUsingPOST() {

　createXMLHttpRequest();

　var url = " GetAndPostExample?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);

} 

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 {

// Set content type of the response to text/xml 

response.setContentType( " text/xml " );

// Get the user's input 

String firstName = request.getParameter( " firstName " );

String middleName = request.getParameter( " middleName " );

String birthday = request.getParameter( " birthday " );

// Create the response text 

String responseText = " Hello " + firstName + " " + middleName

+ " . Your birthday is " + birthday + " . " 

+ " [Method: " + method + " ] " ;

// Write the response back to the browser 

PrintWriter out = response.getWriter();

out.println(responseText);

// Close the writer 

out.close();

　} 

　protected void doGet(HttpServletRequest request,
HttpServletResponse response)

throws ServletException, IOException {

// Process the request in method processRequest 

processRequest(request, response, " GET " );

　} 

　protected void doPost(HttpServletRequest request, 
HttpServletResponse response)

throws ServletException, IOException {

// Process the request in method processRequest 

processRequest(request, response, " POST " );

　} 

} 　

function createXML() {

　var xml = " <pets> " ;

　var options = document.getElementById( " petTypes " ).childNodes;

　var option = null ;

　for ( var i = 0 ; i < options.length; i ++ ) {

option = options[i];

if (option.selected) {

　xml = xml + " <type> " + option.value + " <\/type> " ;

} 

　} 

　xml = xml + " <\/pets> " ;

　return xml;

} 

function sendPetTypes() {

　createXMLHttpRequest();

　var xml = createXML();

　var url = " PostingXMLExample?timeStamp= " + new Date().getTime();

　xmlHttp.open( " POST " , url, true );

　xmlHttp.onreadystatechange = handleStateChange;

　xmlHttp.setRequestHeader( " Content-Type " , 
" application/x-www-form-urlencoded " ); 

　xmlHttp.send(xml);

}