kd5.java

非富多彩的十六个J2ME的例子

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

public class kd5 extends MIDlet implements CommandListener
{
    
    Display dis;
    Form frm1,frm2;
    StringItem sli;
    Ticker tick;
    TextField tf;
    Command cmdget,cmdback;
    String url;
    
    public kd5()
    {
    	dis=Display.getDisplay(this);
    	frm1=new Form("Save Memoy");
    	frm2=new Form("Connection from the save memoy");
    	tick=new Ticker("Welcome to the Save Memoy Bank");
    	tf=new TextField(null,"http://wyl.jmu.edu.cn/keyword.txt",50,tf.URL);
    	StringItem str=new StringItem("Please preess get","");
    	cmdget=new Command("Get",Command.OK,0);
    	cmdback=new Command("Back",Command.BACK,0);
    	frm1.addCommand(cmdget);
    	frm1.append(str);
    	frm1.append(tf);
    	frm1.setTicker(tick);
    	frm1.setCommandListener(this);
    	
    	
    }
    
    public void startApp() 
    {
    	dis.setCurrent(frm1);
    	
    }
    
    public void pauseApp()
    {
    	
    	
    }
    
    public void destroyApp(boolean b)
    {
    	
    }
    
    public void commandAction(Command c,Displayable d)
    {
        try
        {
	    	if(c==cmdget)
	    	{
	    	   url=tf.getString();	
	    	}
	    	
	    	InputStream is=Connector.openInputStream(url);
	    	int indata;
	    	StringBuffer buffer=new StringBuffer();
	    	while((indata=is.read())!=-1)
	    	{
	    		buffer.append((char)indata);
	    	}
	    	sli=new StringItem("","");
	    	sli.setText(buffer.toString());
	    	sli.setLabel("");
	    	frm2.append(sli);
	    	frm2.setCommandListener(this);
	    	dis.setCurrent(frm2);
       }
       
       catch(Exception e)
       {
       	   dis.setCurrent(frm2);
       }
       
       if(c==cmdback)
		{
			dis.setCurrent(frm1);
        }
    	
    }
    	
	
}