try {
    // Construct data
    String data = URLEncoder.encode("key1", "UTF-8") + "=" + URLEncoder.encode("value1", "UTF-8");
    data += "&" + URLEncoder.encode("key2", "UTF-8") + "=" + URLEncoder.encode("value2", "UTF-8");

    // Create a socket to the host
    String hostname = "hostname.com";
    int port = 80;
    InetAddress addr = InetAddress.getByName(hostname);
    Socket socket = new Socket(addr, port);

    // Send header
    String path = "/servlet/SomeServlet";
    BufferedWriter wr = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream(), "UTF8"));
    wr.write("POST "+path+" HTTP/1.0rn");
    wr.write("Content-Length: "+data.length()+"rn");
    wr.write("Content-Type: application/x-www-form-urlencodedrn");
    wr.write("rn");

    // Send data
    wr.write(data);
    wr.flush();

    // Get response
    BufferedReader rd = new BufferedReader(new InputStreamReader(socket.getInputStream()));
    String line;
    while ((line = rd.readLine()) != null) {
        // Process line...
    }
    wr.close();
    rd.close();
} catch (Exception e) {
}