Http Connection : Networks « J2ME « Java

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Java » J2ME » Networks 




Http Connection
Http Connection

/*
J2ME: The Complete Reference

James Keogh

Publisher: McGraw-Hill

ISBN 0072227109

*/
// jad file (Please verify the jar size first)
/*
MIDlet-Name: httpconnection
MIDlet-Version: 1.0
MIDlet-Vendor: MyCompany
MIDlet-Jar-URL: httpconnection.jar
MIDlet-1: httpconnection, , httpconnection
MicroEdition-Configuration: CLDC-1.0
MicroEdition-Profile: MIDP-1.0
MIDlet-JAR-SIZE: 100

*/

import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;
import javax.microedition.io.*;
import java.io.*;

public class httpconnection extends MIDlet implements CommandListener {
  private Command exit, start;
  private Display display;
  private Form form;
  public httpconnection () 
  {
    display = Display.getDisplay(this);
    exit = new Command("Exit", Command.EXIT, 1);
    start = new Command("Start", Command.EXIT, 1);
    form new Form("Http Connection");
    form.addCommand(exit);
    form.addCommand(start);
    form.setCommandListener(this);
  }
  public void startApp()
  {
   display.setCurrent(form);
  }      
  public void pauseApp()
  
  }
  public void destroyApp(boolean unconditional)
  
      destroyApp(false);
      notifyDestroyed();
  }
  public void commandAction(Command command, Displayable displayable
  {
    if (command == exit
    {
      destroyApp(false);
      notifyDestroyed();
    }
    else if (command == start
    {
      HttpConnection connection = null;
      InputStream inputstream = null;
      try
      {
        connection = (HttpConnectionConnector.open("http://www.myserver.com/myinfo.txt");
        //HTTP Request
        connection.setRequestMethod(HttpConnection.GET);
        connection.setRequestProperty("Content-Type","//text plain");
        connection.setRequestProperty("Connection""close");
        // HTTP Response
        System.out.println("Status Line Code: " + connection.getResponseCode());
        System.out.println("Status Line Message: " + connection.getResponseMessage());
        if (connection.getResponseCode() == HttpConnection.HTTP_OK)
        {
          System.out.println(
            connection.getHeaderField(0)" " + connection.getHeaderFieldKey(0));        
          System.out.println(
           "Header Field Date: " + connection.getHeaderField("date"));
          String str;
          inputstream = connection.openInputStream();
          int length = (intconnection.getLength();
          if (length != -1)
          {
            byte incomingData[] new byte[length];
            inputstream.read(incomingData);
            str = new String(incomingData);
          }
          else  
          {
            ByteArrayOutputStream bytestream = 
                  new ByteArrayOutputStream();
            int ch;
            while ((ch = inputstream.read()) != -1)
            {
              bytestream.write(ch);
            }
            str = new String(bytestream.toByteArray());
            bytestream.close();
          }
          System.out.println(str);
        }
      }
      catch(IOException error)
      {
       System.out.println("Caught IOException: " + error.toString());
      }
      finally
      {
        if (inputstream!= null)
        {
          try 
          
            inputstream.close();
          }
          catchException error)
          {
             /*log error*/
          }
        }
        if (connection != null)
        {
          try
          {
             connection.close();
          }
          catchException error)
          {
             /*log error*/
          }
        }
      }
    }
  }
}

           
       














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