Not getting value in midlet from servlet - servlets

Question

I'm trying to send data from a midlet to a servlet and recieve back a response from the servlet but I don't get any value in response. I've tried to print it on command window and it seems to be null yet I expect only two values "ok" or "error". Please help me check the code and let me know what I should do to get the response right on the midlet. My code is below:
import javax.microedition.midlet.*;//midlet class package import
import javax.microedition.lcdui.*;//package for ui and commands
import javax.microedition.io.*;//
import java.io.*;
/**
* #author k'owino
*/
//Defining the midlet class
public class MvsMidlet extends MIDlet implements CommandListener {
private boolean midletPaused = false;//variable for paused state of midlet
//defining variables
private Display display;// Reference to Display object
private Form welForm;
private Form vCode;//vote code
private StringItem welStr;
private TextField phoneField;
private StringItem phoneError;
private Command quitCmd;
private Command contCmd;
//constructor of the midlet
public MvsMidlet() {
display = Display.getDisplay(this);//creating the display object
welForm = new Form("THE MVS");//instantiating welForm object
welStr = new StringItem("", "Welcome to the MVS, Busitema's mobile voter."
+ "Please enter the your phone number below");//instantiating welStr string item
phoneError = new StringItem("", "");//intantiating phone error string item
phoneField = new TextField("Phone number e.g 0789834141", "", 10, 3);//phone number field object
quitCmd = new Command("Quit", Command.EXIT, 0);//creating quit command object
contCmd = new Command("Continue", Command.OK, 0);//creating continue command object
welForm.append(welStr);//adding welcome string item to form
welForm.append(phoneField);//adding phone field to form
welForm.append(phoneError);//adding phone error string item to form
welForm.addCommand(contCmd);//adding continue command
welForm.addCommand(quitCmd);//adding quit command
welForm.setCommandListener(this);
display.setCurrent(welForm);
}
//start application method definition
public void startApp() {
}
//pause application method definition
public void pauseApp() {
}
//destroy application method definition
public void destroyApp(boolean unconditional) {
}
//Command action method definition
public void commandAction(Command c, Displayable d) {
if (d == welForm) {
if (c == quitCmd) {
exitMidlet();//call to exit midlet
} else {//if the command is contCmd
//place a waiting activity indicator
System.out.println("ken de man");
Thread t = new Thread() {
public void run() {
try {
//method to connect to server
sendPhone();
} catch (Exception e) {
}//end of catch
}//end of ru()
};//end of thread
t.start();//starting the thread
}//end of else
}//end of first if
}//end of command action
//defining method to exit midlet
public void exitMidlet() {
display.setCurrent(null);
destroyApp(true);
notifyDestroyed();
}//end of exitMidlet()
//defining sendPhone method
public void sendPhone() throws IOException {
System.out.println("ken de man");//check
HttpConnection http = null;//HttpConnection variable
OutputStream oStrm = null;//OutputStream variable
InputStream iStrm = null;//InputStream variable
String url = "http://localhost:8084/MvsWeb/CheckPhone";//server url
try {
http = (HttpConnection) Connector.open(url);//opening connection
System.out.println("connection made");//checking code
oStrm = http.openOutputStream();//opening output stream
http.setRequestMethod(HttpConnection.POST);//setting request type
http.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");//setting content type
byte data[] = ("phone=" + phoneField.getString()).getBytes();
oStrm.write(data);
iStrm = http.openInputStream();//openning input stream
if (http.getResponseCode() == HttpConnection.HTTP_OK) {
int length = (int) http.getLength();
String str;
if (length != -1) {
byte servletData[] = new byte[length];
iStrm.read(servletData);
str = new String(servletData);
} else // Length not available...
{
ByteArrayOutputStream bStrm = new ByteArrayOutputStream();
int ch;
while ((ch = iStrm.read()) != -1) {
bStrm.write(ch);
}
str = new String(bStrm.toByteArray());
bStrm.close();
}
System.out.println("de man");
System.out.println(str);
if (str.equals("ok")) {
//change to vcode form
} else {
//add error message to phone_error stingItem
}
}
} catch (Exception e) {
}
}
}//end of class definition
//servlet
import java.io.*;//package for io classes
import javax.servlet.ServletException;//package for servlet exception classes
import javax.servlet.http.*;
import java.sql.*;//package for sql classes
/**
*
* #author k'owino
*/
public class CheckPhone extends HttpServlet {
#Override
protected void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
}
#Override
protected void doPost(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
//declaring variables
PrintWriter pw;//PrintWriter object
String pnum;//phone parameter sent from client
Connection con = null;//connection variable
String dbDriver = "com.jdbc.mysql.Driver";//the database driver
String dbUrl = "jdbc:mysql://localhost/mvs_db";//the database url
String dbUser = "root";//database user
String dbPwd = "";//database password
PreparedStatement pstmt = null;//Prepared statement variable
String query = "select * from student where stud_phone = ?;";
ResultSet rs = null;//resultset variable
String dbPhone=null;//phone from database
//getting the "phone" parameter sent from client
pnum = req.getParameter("phone");//getting the "phone" parameter sent from client
System.out.println(pnum);
//setting the content type of the response
res.setContentType("text/html");
//creating a PrintWriter object
pw = res.getWriter();
pw.println("ken");
try{//trying to load the database driver and establish a connection to the database
Class.forName(dbDriver).newInstance();//loading the database driver
con = DriverManager.getConnection(dbUrl,dbUser,dbPwd);//establishing a connection to the database
System.out.println("connection established");
}
catch(Exception e){
}
//trying to query the database
try{
pstmt = con.prepareStatement(query);//preparing a statement
pstmt.setString(1, pnum);//setting the input parameter
rs = pstmt.executeQuery();//executing the query assigning to the resultset object
//extracring data from the resultset
while(rs.next()){
dbPhone = rs.getString("stud_phone");//getting the phone number from database
}//end of while
if(pnum.equals(dbPhone)){
pw.print("ok");
pw.close();
}
else{
pw.print("error");
pw.close();
}
}
catch(Exception e){
}
}
#Override
public String getServletInfo() {
return "Short description";
}// </editor-fold>
}