Java

StringBuffer stringbuffer = new StringBuffer();
for(int i = 0; i < stringbuffer.length(); i++)
{
    byte byte0 = (byte)stringbuffer.charAt(i);
    stringbuffer.append((char)byte0);
}

0:   getstatic       #5; //Field a:Z
3:   ifeq    47
6:   new     #4; //class java/lang/StringBuffer
9:   dup
10:  invokespecial   #9; //Method java/lang/StringBuffer."<init>":()V
13:  astore_1
14:  iconst_0
15:  istore_2
16:  goto    36
19:  aload_1
20:  iload_2
21:  invokevirtual   #13; //Method java/lang/StringBuffer.charAt:(I)C
24:  i2b
25:  istore_3
26:  aload_1
27:  iload_3
28:  i2c
29:  invokevirtual   #11; //Method java/lang/StringBuffer.append:(C)Ljava/lang/StringBuffer;
32:  pop
33:  iinc    2, 1
36:  iload_2
37:  aload_1
38:  invokevirtual   #15; //Method java/lang/StringBuffer.length:()I
41:  if_icmplt       19
44:  invokestatic    #12; //Method b:()V
47:  getstatic       #6; //Field b:Z
50:  ifeq    57
53:  iconst_0
54:  putstatic       #6; //Field b:Z
57:  iconst_0
58:  putstatic       #5; //Field a:Z
61:  return

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import javax.microedition.io.Connector;
import javax.microedition.io.HttpConnection;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Displayable;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.StringItem;
import javax.microedition.lcdui.TextField;

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

/**
 *
 * @author William
 */
public class midle extends MIDlet implements CommandListener {

    private static String defalutUrl="http://localhost:8080/DeleteWebApplication/RomaServlet";
    //GUI to input string form the user
    private Display myDisplay=null;
    private Form mainScreen;
    private TextField requestField;

    //GUI for displaying header information
    private Form resultScreen;
    private StringItem resultField;

    //the "SEND" button used in the mainScreen
    Command sendCommand = new Command("SEND", Command.OK, 1);

    //the "BACK" button used in the resultScreen
    Command backCommand = new Command("BACK", Command.OK, 1);

    public midle() {
        myDisplay=Display.getDisplay(this);
        mainScreen=new Form("ROMA4EVER");
        requestField=new TextField("enter a string please", "", 100, TextField.ANY);
        mainScreen.append(requestField);
        mainScreen.addCommand(sendCommand);
        mainScreen.setCommandListener(this);
    }

    public void commandAction(Command c, Displayable d) {
        if(c==sendCommand){
            //retrieving the String that user had entered
            String requestString= requestField.getString();
            //sending a POST request to the web server
            String resultString= sendPostRequest(requestString);
            //displaying the response back from the web server
            resultScreen=new Form("Azzuri");
            resultField=new StringItem(null,resultString);
            resultScreen.append(resultField);
            resultScreen.addCommand(backCommand);
            resultScreen.setCommandListener(this);
            myDisplay.setCurrent(resultScreen);
        }else{
            if(c==backCommand){
                //do it all again
                requestField.setString("SOMETHING GOOD");
                myDisplay.setCurrent(mainScreen);
            }else{
            }
        }
    }

    //send a POST request to the web server
    public String sendPostRequest(String requestString){
        HttpConnection hc=null;
        DataInputStream dis=null;
        DataOutputStream dos=null;
        StringBuffer messagebuffer=new StringBuffer();
        try {
            // open a http connection with the web server to send and recieve operation
            hc=(HttpConnection)Connector.open(defalutUrl,Connector.READ_WRITE);
            //set the request method to POST
            hc.setRequestMethod(HttpConnection.POST);
            //sent the string entered by user byte by byte
            dos=hc.openDataOutputStream();
            byte[] requst_budy=requestString.getBytes();
            for(int i=0;i<requst_budy.length;i++){
                dos.writeByte(requst_budy[i]);
            }
            dos.flush();
            dos.close();
            //retrieve the response back from the web server
            dis=new DataInputStream(hc.openInputStream());
            int ch;
            //first we have to check the content lenght
            long len=hc.getLength();
            if(len!=-1){
                for(int i=0;i<len;i++)
                    if((ch=dis.read())!=-1){
                        messagebuffer.append((char)ch);
                    }else{
                        while((ch=dis.read())!=-1){
                            messagebuffer.append((char)ch);
                        }
                    }
            }
            dis.close();
        } catch (IOException ioe) {
            messagebuffer.append("ERROR!");
        }finally{
            //free up i/0 streams and http connection
            try {
                if(hc!=null)
                    hc.close();
            } catch (Exception e) {
            }
            try {
                if(dis!=null)
                    dis.close();
            } catch (Exception e) {
            }
            try {
                if(dos!=null)
                    dos.close();
            } catch (Exception e) {
            }
            return messagebuffer.toString();
        }
    }

    protected void destroyApp(boolean unconditional) throws MIDletStateChangeException {

    }

    protected void pauseApp() {

    }

    protected void startApp() throws MIDletStateChangeException {
        myDisplay.setCurrent(mainScreen);
    }

}

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

package web;

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *
 * @author William
 */
public class RomaServlet extends HttpServlet {
   
    /** 
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        String username=request.getParameter(null);
        PrintWriter out = response.getWriter();
        
        String totti="";
        for(int i=username.length()-1;i>=0;i--){
            totti=totti+username.charAt(i);
        }
        //out.close();
        System.out.println(request.getParameterMap().size());
        try {
             //TODO output your page here
            out.println("<html>");
            out.println("<head>");
            out.println("<title>Servlet RomaServlet</title>");  
            out.println("</head>");
            out.println("<body>");
            out.println("<h1>Servlet RomakServlet at " +totti+ "</h1>");
            out.println("</body>");
            out.println("</html>");
            
        } finally { 
            out.close();
        }
    } 

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /** 
     * Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    } 

    /** 
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
     * Returns a short description of the servlet.
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

}