Http post : Connector « J2ME « Java Tutorial

1. Java Tutorial
2. J2ME
3. Connector

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;

import javax.microedition.io.Connector;
import javax.microedition.io.HttpConnection;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.StringItem;
import javax.microedition.lcdui.TextField;
import javax.microedition.midlet.MIDlet;

public class HttpPOSTMIDlet extends MIDlet implements CommandListener {
  private Command exitCommand= new Command("Exit", Command.EXIT, 1);

  private Command sendCommand = new Command("Send", Command.OK, 1);

  private Command backCommand= new Command("Upload", Command.OK, 1);

  private Display display;

  private String defaultURL = "http://localhost/fetchNews.asp";

  private Form mainForm, resultForm;

  private TextField URL = new TextField(null, null, 250, TextField.URL);

  private StringItem resultItem;

  public HttpPOSTMIDlet() {
    display = Display.getDisplay(this);
  }

  public void startApp() {
    mainForm = new Form("Name");
    mainForm.append(URL);
    mainForm.addCommand(sendCommand);
    mainForm.addCommand(exitCommand);
    mainForm.setCommandListener(this);
    display.setCurrent(mainForm);
  }

  public void pauseApp() {
  }

  public void destroyApp(boolean unconditional) {
  }

  public void commandAction(Command c, Displayable s) {
    if (c == sendCommand) {
      String result = "";
      resultItem = new StringItem(null, result);
      resultForm = new Form("Result");
      String URLString = "name=" + URL.getString();

      try {
        result = requestUsingGET(URLString);
      } catch (IOException e) {
        result = "Falied";
      }

      resultItem.setText(result);
      resultForm.append(resultItem);
      resultForm.addCommand(backCommand);
      resultForm.setCommandListener(this);
      display.setCurrent(resultForm);
    } else if (c == backCommand) {
      URL.setString(defaultURL);
      display.setCurrent(mainForm);
    } else {
      destroyApp(false);
      notifyDestroyed();
    }
  }

  private String requestUsingGET(String URLString) throws IOException {
    HttpConnection hpc = null;
    DataInputStream dis = null;
    DataOutputStream dos = null;

    boolean newline = false;
    String content = "";
    try {
      hpc = (HttpConnection) Connector.open(defaultURL);
      hpc.setRequestMethod(HttpConnection.POST);
      hpc.setRequestProperty("User-Agent", "Profile/MIDP-1.0 Configuration/CLDC-1.0");
      hpc.setRequestProperty("Content-Language", "zh-tw");
      hpc.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
      hpc.setRequestProperty("Content-Length", String.valueOf(URLString.length()));

      dos = new DataOutputStream(hpc.openOutputStream());
      dos.write(URLString.getBytes());
      dos.flush();

      InputStreamReader xdis = new InputStreamReader(hpc.openInputStream());

      int character;
      while ((character = xdis.read()) != -1) {
        if ((char) character == '\\') {
          newline = true;
          continue;
        } else {
          if ((char) character == 'n' && newline) {
            content += "\n";
            newline = false;
          } else if (newline) {
            content += "\\" + (char) character;
            newline = false;
          } else {
            content += (char) character;
            newline = false;
          }
        }

      }
      if (hpc != null)
        hpc.close();
      if (dis != null)
        dis.close();
    } catch (IOException e2) {
    }

    return content;
  }
}