Flex and Java - HTTP Post Example

Below is Flex code sample to communicate to a Java servlet in the back-end using HTTP Post Service.

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" xmlns="*" creationComplete="send_data()">

    <mx:Script>
        <![CDATA[              
            private function send_data():void {
                userRequest.send();
            }            
        ]]>
    </mx:Script>
    
    <mx:Form x="22" y="10" width="493">
        <mx:HBox>
            <mx:Label text="Username"/>
            <mx:TextInput id="username"/>
        </mx:HBox>
        
        <mx:HBox>
            <mx:Label text="Email Address"/>
            <mx:TextInput id="emailaddress"/>
        </mx:HBox>
        <mx:Button label="Submit" click="send_data()"/>
    </mx:Form>
        
    <mx:HTTPService id="userRequest" url="http://localhost:8080/flexJavaIntegration/opendesk" useProxy="false" method="POST">
        <mx:request xmlns="">
            <username>{username.text}</username>
            <emailaddress>{emailaddress.text}</emailaddress>
        </mx:request>
    </mx:HTTPService>
            
</mx:Application>
 

Now, here is the Java Servlet.

package com.opendesk.flexjava;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Enumeration;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class OpenDeskService extends HttpServlet {

 public void doPost(HttpServletRequest req, HttpServletResponse res)
   throws ServletException, IOException {  
  
  Enumeration  en = req.getParameterNames();

  while (en.hasMoreElements()) {
   String key = (String) en.nextElement();
   String value = (String) req.getParameter(key);

   System.out.println("Key : " + key + " Value : " + value);
  }
 }

 public void doGet(HttpServletRequest request, HttpServletResponse response)
   throws IOException, ServletException {
  
  response.setContentType("text/xml");
  PrintWriter writer = response.getWriter();

  writer.println("<?xml version=\"1.0\"?>\n");
  writer.println("<salesdata>");
  writer.println("<item type=\"xxxxxxxxxxxxCDs\">");
  writer.println("<profit>");
  writer.println("  <beforetax>1750</beforetax>");
  writer.println("  <aftertax>1600</aftertax>");
  writer.println("</profit>");
  writer.println("<sales>21000.23</sales>");
  writer.println("</item>");
  writer.println("<item type=\"DVD\">");
  writer.println("<profit>");
  writer.println("  <beforetax>1550.34</beforetax>");
  writer.println("  <aftertax>1350.10</aftertax>");
  writer.println("</profit>");
  writer.println("<sales>11010.98</sales>");
  writer.println("</item>");
  writer.println("</salesdata>");
 }
}