开发J2ME联网应用程序

import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.StringItem;
import javax.microedition.lcdui.TextField;


public class InputCanvas extends Form implements CommandListener
{
   private UIController uicontroller;
   private TextField inputField;
   private StringItem result;
   public static final Command okCommand = new Command("OK", Command.OK, 1);

   public InputCanvas(UIController uicontroller)
   {
       super("Http Comunication");
       this.uicontroller = uicontroller;
       inputField = new TextField("Input:", null, 20, TextField.ANY);
       this.append(inputField);
       this.addCommand(okCommand);
       this.setCommandListener(this);
   }


   public void commandAction(Command arg0, Displayable arg1)
   {
       
       if (arg0 == okCommand)
       {
           String input = inputField.getString();
           uicontroller.handleEvent(UIController.EventID.CONNECT_TO_SERVER,
                   new Object[] { input });
       }

   }

}


import java.io.*;

import javax.microedition.io.Connector;
import javax.microedition.io.HttpConnection;


public class HttpCommHandler
{
   private String URL;

   public HttpCommHandler(String URL)
   {
       this.URL = URL;
   }

   public String sendMessage(String message) throws IOException
   {
       HttpConnection httpConn;
       DataInputStream input;
       DataOutputStream output;
       String result;
       try
       {
           httpConn = open();
           output = this.openDataOutputStream(httpConn);
           output.writeUTF(message);
           output.close();
           input = this.openDataInputStream(httpConn);
           result = input.readUTF();
           closeConnection(httpConn,input,output);
           return result;

       }

       finally 
       {

       }

   }

   public HttpConnection open() throws IOException
   {
       try
       {
           HttpConnection connection = (HttpConnection) Connector.open(URL);

           connection.setRequestProperty("User-Agent", System
                   .getProperty("microedition.profiles"));
           connection.setRequestProperty("Content-Type",
                   "application/octet-stream");
           connection.setRequestMethod(HttpConnection.POST);

           return connection;
       } catch (IOException ioe)
       {

           throw ioe;
       }

   }

   private DataInputStream openDataInputStream(HttpConnection conn)
           throws IOException

   {
       int code = conn.getResponseCode();
       if (code == HttpConnection.HTTP_OK)
       {
           return conn.openDataInputStream();
       } else
       {
           throw new IOException();
       }
   }

   private DataOutputStream openDataOutputStream(HttpConnection conn)
           throws IOException
   {
       return conn.openDataOutputStream();
   }

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