Java Tutorial/J2ME/Connector

Call asp page from J2ME

import java.io.IOException;
import java.io.InputStream;
import javax.microedition.io.Connector;
import javax.microedition.io.HttpConnection;
import javax.microedition.lcdui.Alert;
import javax.microedition.lcdui.rumand;
import javax.microedition.lcdui.rumandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.midlet.MIDlet;
public class CookieMIDlet extends MIDlet {
  private Display mDisplay;
  private Form mForm;
  private String mSession;
  public void startApp() {
    mDisplay = Display.getDisplay(this);
    mForm = new Form("CookieMIDlet");
    mForm.addCommand(new Command("Exit", Command.EXIT, 0));
    mForm.addCommand(new Command("Send", Command.SCREEN, 0));
    mForm.setCommandListener(new CommandListener() {
      public void commandAction(Command c, Displayable s) {
        if (c.getCommandType() == Command.EXIT)
          notifyDestroyed();
        else
          send();
      }
    });
    mDisplay.setCurrent(mForm);
  }
  private void send() {
    String url = "http://localhost/http.asp";
    try {
      HttpConnection hc = (HttpConnection) Connector.open(url);
      if (mSession != null)
        hc.setRequestProperty("cookie", mSession);
      InputStream in = hc.openInputStream();
      String cookie = hc.getHeaderField("Set-cookie");
      if (cookie != null) {
        int semicolon = cookie.indexOf(";");
        mSession = cookie.substring(0, semicolon);
      }
      int length = (int) hc.getLength();
      byte[] raw = new byte[length];
      in.read(raw);
      String s = new String(raw);
      Alert a = new Alert("Response", s, null, null);
      a.setTimeout(Alert.FOREVER);
      mDisplay.setCurrent(a, mForm);
      in.close();
      hc.close();
    } catch (IOException ioe) {
      Alert a = new Alert("Exception", ioe.toString(), null, null);
      a.setTimeout(Alert.FOREVER);
      mDisplay.setCurrent(a, mForm);
    }
  }
  public void pauseApp() {
  }
  public void destroyApp(boolean unconditional) {
  }
}

Check Http connection returning code

import java.io.IOException;
import javax.microedition.io.Connector;
import javax.microedition.io.HttpConnection;
import javax.microedition.lcdui.rumand;
import javax.microedition.lcdui.rumandListener;
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 HttpOKMIDlet 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/";
  private Form mainForm, resultForm;
  private TextField URL= new TextField(null, defaultURL, 250, TextField.URL);
  private StringItem resultItem;
  public HttpOKMIDlet() {
    display = Display.getDisplay(this);
  }
  public void startApp() {
    mainForm = new Form("Test");
    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 = 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;
    String content = "";
    try {
      hpc = (HttpConnection) Connector.open(URLString);
      int status = hpc.getResponseCode();
      if (status != HttpConnection.HTTP_OK)
        content = "failed";
      else
        content = "connected";
      if (hpc != null)
        hpc.close();
    } catch (IOException e2) {
    }
    return content;
  }
}

Http Get with J2ME

import java.io.DataInputStream;
import java.io.IOException;
import javax.microedition.io.Connector;
import javax.microedition.io.HttpConnection;
import javax.microedition.lcdui.rumand;
import javax.microedition.lcdui.rumandListener;
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 HttpGETMIDlet 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/JIDCA/hello.asp?name=JIDCA";
  private Form mainForm, resultForm;
  private TextField URL = new TextField(null, defaultURL, 250, TextField.URL);
  private StringItem resultItem;
  public HttpGETMIDlet() {
    display = Display.getDisplay(this);
  }
  public void startApp() {
    mainForm = new Form("Address");
    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 = 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;
    boolean newline = false;
    String content = "";
    try {
      hpc = (HttpConnection) Connector.open(URLString);
      dis = new DataInputStream(hpc.openInputStream());
      int character;
      while ((character = dis.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;
  }
}

Http header

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.rumand;
import javax.microedition.lcdui.rumandListener;
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 HttpHEADMIDlet 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/";
  private Form mainForm, resultForm;
  private TextField URL= new TextField(null, defaultURL, 250, TextField.URL);
  private StringItem resultItem;
  public HttpHEADMIDlet() {
    display = Display.getDisplay(this);
  }
  public void startApp() {
    mainForm = new Form("HEDA Method");
    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 = 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;
    String content = "";
    try {
      hpc = (HttpConnection) Connector.open(URLString);
      hpc.setRequestMethod(HttpConnection.HEAD);
      dis = new DataInputStream(hpc.openInputStream());
      int i = 1;
      String key = "";
      String value = "";
      while ((value = hpc.getHeaderField(i)) != null) {
        key = hpc.getHeaderFieldKey(i++);
        content += key + ":" + value + "\n";
      }
      if (hpc != null)
        hpc.close();
      if (dis != null)
        dis.close();
    } catch (IOException e2) {
    }
    return content;
  }
}

Http post

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.rumand;
import javax.microedition.lcdui.rumandListener;
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;
  }
}

Image Loader

import java.io.DataInputStream;
import java.io.IOException;
import javax.microedition.io.Connector;
import javax.microedition.io.HttpConnection;
import javax.microedition.lcdui.rumand;
import javax.microedition.lcdui.rumandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.Image;
import javax.microedition.lcdui.ImageItem;
import javax.microedition.midlet.MIDlet;
public class J2MEImageLoader extends MIDlet implements CommandListener, Runnable {
  private Display mDisplay;
  private Form mForm = new Form("Connecting...");
  public J2MEImageLoader() {
    mForm.addCommand(new Command("Exit", Command.EXIT, 0));
    mForm.setCommandListener(this);
  }
  public void startApp() {
    mDisplay = Display.getDisplay(this);
    mDisplay.setCurrent(mForm);
    Thread t = new Thread(this);
    t.start();
  }
  public void pauseApp() {
  }
  public void destroyApp(boolean unconditional) {
  }
  public void commandAction(Command c, Displayable s) {
    if (c.getCommandType() == Command.EXIT)
      notifyDestroyed();
  }
  public void run() {
    HttpConnection hc = null;
    DataInputStream in = null;
    try {
      hc = (HttpConnection) Connector.open("http://www.y.ru/image.gif");
      int length = (int) hc.getLength();
      byte[] data = null;
      if (length != -1) {
        data = new byte[length];
        in = new DataInputStream(hc.openInputStream());
        in.readFully(data);
      } else {
        int chunkSize = 512;
        int index = 0;
        int readLength = 0;
        in = new DataInputStream(hc.openInputStream());
        data = new byte[chunkSize];
        do {
          if (data.length < index + chunkSize) {
            byte[] newData = new byte[index + chunkSize];
            System.arraycopy(data, 0, newData, 0, data.length);
            data = newData;
          }
          readLength = in.read(data, index, chunkSize);
          index += readLength;
        } while (readLength == chunkSize);
        length = index;
      }
      Image image = Image.createImage(data, 0, length);
      ImageItem imageItem = new ImageItem(null, image, 0, null);
      mForm.append(imageItem);
      mForm.setTitle("Done.");
    } catch (IOException ioe) {
      mForm.setTitle("Error.");
    }
  }
}

Load image from a URL

import java.io.DataInputStream;
import java.io.IOException;
import javax.microedition.io.Connector;
import javax.microedition.io.HttpConnection;
import javax.microedition.lcdui.rumand;
import javax.microedition.lcdui.rumandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.Image;
import javax.microedition.lcdui.ImageItem;
import javax.microedition.lcdui.Item;
import javax.microedition.lcdui.StringItem;
import javax.microedition.lcdui.TextField;
import javax.microedition.midlet.MIDlet;
public class HttpMIDlet 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 URL = "http://localhost/Java.png";
  private Form mainForm, resultForm;
  private Item mItem;
  private TextField URLField = new TextField(null, URL, 250, TextField.URL);
  public HttpMIDlet() {
    display = Display.getDisplay(this);
  }
  public void startApp() {
    mainForm = new Form("Address");
    mainForm.append(URLField);
    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) {
      resultForm = new Form("Image");
      String URLString = URLField.getString();
      try {
        Image image = loadImage(URLString);
        mItem = new ImageItem(null, image, 0, null);
      } catch (IOException ioe) {
        mItem = new StringItem(null, ioe.toString());
      }
      resultForm.append(mItem);
      resultForm.addCommand(backCommand);
      resultForm.setCommandListener(this);
      display.setCurrent(resultForm);
    } else if (c == backCommand) {
      URLField.setString(URL);
      display.setCurrent(mainForm);
    } else {
      destroyApp(false);
      notifyDestroyed();
    }
  }
  public Image loadImage(String url) throws IOException {
    HttpConnection hpc = null;
    DataInputStream dis = null;
    try {
      hpc = (HttpConnection) Connector.open(url);
      int length = (int) hpc.getLength();
      byte[] data = new byte[length];
      dis = new DataInputStream(hpc.openInputStream());
      dis.readFully(data);
      return Image.createImage(data, 0, data.length);
    } finally {
      if (hpc != null)
        hpc.close();
      if (dis != null)
        dis.close();
    }
  }
}

URL query

import java.io.IOException;
import javax.microedition.io.Connector;
import javax.microedition.io.HttpConnection;
import javax.microedition.lcdui.rumand;
import javax.microedition.lcdui.rumandListener;
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 ConnectHttpMIDlet 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://www.g.ru/p=MDIP&u=b&y=y&hc=0&hs=0";
  private Form mainForm, resultForm;
  private TextField URL = new TextField(null, defaultURL, 250, TextField.URL);
  private StringItem resultItem;
  public ConnectHttpMIDlet() {
    display = Display.getDisplay(this);
  }
  public void startApp() {
    mainForm = new Form("Data");
    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 = URL.getString();
      try {
        result = requestUsingGET(URLString);
      } catch (IOException e) {
        result = "failed";
      }
      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;
    String content = "";
    try {
      hpc = (HttpConnection) Connector.open(URLString);
      content += "URL: " + hpc.getURL() + "\n";
      content += "Protocol: " + hpc.getProtocol() + "\n";
      content += "Host: " + hpc.getHost() + "\n";
      content += "Port: " + hpc.getPort() + "\n";
      content += "File: " + hpc.getFile() + "\n";
      content += "Query: " + hpc.getQuery() + "\n";
      content += "reference: " + hpc.getRef() + "\n";
      content += "request method: " + hpc.getRequestMethod();
      if (hpc != null)
        hpc.close();
    } catch (IOException e2) {
    }
    return content;
  }
}