Here's my final source code:

Question

import javax.microedition.io.Connector;
import javax.microedition.io.HttpConnection;
import javax.microedition.lcdui.*;
import javax.microedition.midlet.MIDlet;
import java.io.*;
import java.util.*;
public class PostHttp {
static String protocol;
static String host;
static String path;
static String document;
static String postData;
public PostHttp() {
// These are the default values.
// If none of the "set" methods are called, these values are used.
// Note this class could be used to submit data to any POST form.
protocol = "http://";
host = "www.myhost.com";
path ="/path/toASPForm/";
document = "formProcess.asp";
postData = "";
public void setProtocol(String p) {
protocol = p;
public void setHost(String h) {
host = h;
public void setPath(String p) {
path = p;
public void setDocument(String d) {
document = d;
public void setParameter(String parameter, String value) {
// There could be a problem here with special characters like '&'
if (postData.length() > 0) {
postData = postData + "&";
postData = postData + parameter + "=" + value;
HttpConnection setupConnection(String uri) throws IOException {
HttpConnection connection = null;
connection = (HttpConnection)Connector.open(uri);
connection.setRequestMethod(HttpConnection.POST);
connection.setRequestProperty("IF-Modified-Since", "20 Jan 2001 16:19:14 GMT");
connection.setRequestProperty("User-Agent", "Profile/MIDP-2.0 Configuration/CLDC-1.1");
connection.setRequestProperty("Content-Language", "en-US");
connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
connection.setRequestProperty("Host", host);
return(connection);
void sendPostData(HttpConnection connection,String myPostData) throws IOException {
OutputStream outputStream = null;
outputStream = connection.openOutputStream();
outputStream.write(myPostData.getBytes());
outputStream.flush();
outputStream.close();
String readResult(HttpConnection connection) throws IOException {
InputStreamReader inputStream;
String result = "";
final int arbitraryBufferSize = 1;
final int endOfData = -1;
char[] characterBuffer = new char[arbitraryBufferSize];
int bytesRead;
inputStream = new InputStreamReader(connection.openInputStream());
bytesRead = inputStream.read(characterBuffer);
while (bytesRead != endOfData) {
result = result + new String(characterBuffer);
bytesRead = inputStream.read(characterBuffer);
inputStream.close();
return(result);
public String submit() {
HttpConnection connection;
String result;
String myUri= (protocol + host + path + document);
try {
connection = setupConnection(myUri);
     postData = postData + '\r\n';
sendPostData(connection, postData);
result = readResult(connection);
     result += "\nRC:" + connection.getResponseCode(); // Here the response code always is:400 (Invalid Header Name)! ;-(
connection.close();
} catch (IOException ioe) {
result = "IOException!";
return(result);
}

Answer 1

import javax.microedition.io.Connector;
import javax.microedition.io.HttpConnection;
import javax.microedition.lcdui.*;
import javax.microedition.midlet.MIDlet;
import java.io.*;
import java.util.*;
public class PostHttp {
static String protocol;
static String host;
static String path;
static String document;
static String postData;
public PostHttp() {
// These are the default values.
// If none of the "set" methods are called, these values are used.
// Note this class could be used to submit data to any POST form.
protocol = "http://";
host = "www.myhost.com";
path ="/path/toASPForm/";
document = "formProcess.asp";
postData = "";
public void setProtocol(String p) {
protocol = p;
public void setHost(String h) {
host = h;
public void setPath(String p) {
path = p;
public void setDocument(String d) {
document = d;
public void setParameter(String parameter, String value) {
// There could be a problem here with special characters like '&'
if (postData.length() > 0) {
postData = postData + "&";
postData = postData + parameter + "=" + value;
HttpConnection setupConnection(String uri) throws IOException {
HttpConnection connection = null;
connection = (HttpConnection)Connector.open(uri);
connection.setRequestMethod(HttpConnection.POST);
connection.setRequestProperty("IF-Modified-Since", "20 Jan 2001 16:19:14 GMT");
connection.setRequestProperty("User-Agent", "Profile/MIDP-2.0 Configuration/CLDC-1.1");
connection.setRequestProperty("Content-Language", "en-US");
connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
connection.setRequestProperty("Host", host);
return(connection);
void sendPostData(HttpConnection connection,String myPostData) throws IOException {
OutputStream outputStream = null;
outputStream = connection.openOutputStream();
outputStream.write(myPostData.getBytes());
outputStream.flush();
outputStream.close();
String readResult(HttpConnection connection) throws IOException {
InputStreamReader inputStream;
String result = "";
final int arbitraryBufferSize = 1;
final int endOfData = -1;
char[] characterBuffer = new char[arbitraryBufferSize];
int bytesRead;
inputStream = new InputStreamReader(connection.openInputStream());
bytesRead = inputStream.read(characterBuffer);
while (bytesRead != endOfData) {
result = result + new String(characterBuffer);
bytesRead = inputStream.read(characterBuffer);
inputStream.close();
return(result);
public String submit() {
HttpConnection connection;
String result;
String myUri= (protocol + host + path + document);
try {
connection = setupConnection(myUri);
     postData = postData + '\r\n';
sendPostData(connection, postData);
result = readResult(connection);
     result += "\nRC:" + connection.getResponseCode(); // Here the response code always is:400 (Invalid Header Name)! ;-(
connection.close();
} catch (IOException ioe) {
result = "IOException!";
return(result);
}