recordmonitormidlet.java

j2me的程序

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.rms.*;

public class RecordMonitorMIDlet extends MIDlet
                                 implements CommandListener,RecordListener {
  private Command exitCommand;
  private Command deleteCommand;
  private Command changeCommand;
    //The display for this MIDlet
  private Display display;

  RecordStore mainRS = null;
  RecordStore backupRS = null;


  public RecordMonitorMIDlet() {
    display = Display.getDisplay(this);
    exitCommand = new Command("离开", Command.EXIT, 1);
    deleteCommand = new Command("删除",Command.SCREEN,1);
    changeCommand = new Command("修改",Command.SCREEN,1);
  }

  // Start the MIDlet by creating the TextBox and
  // associating the exit command and listener.
  public void startApp() {
	TextBox aTextBox = new TextBox("主画面",null,256,TextField.ANY);

	byte[] nameEmail=null;
	boolean existingOrNot = false;
	boolean OK = true;

	existingOrNot = existing("aRS1");
	if(existingOrNot){
	   try{
		   mainRS = RecordStore.openRecordStore("aRS1",false);
		   mainRS.addRecordListener(this);
       }
       catch(Exception e){
		OK = false;
	   }
	   finally{
		 if(OK){
			 aTextBox.setString("aRS已存在并且已打开");
	          }
	          else{
			aTextBox.setString("aRS已存在但无法打开");
	          }
            }
        }
    else{
	   try{
	    	mainRS = RecordStore.openRecordStore("aRS1",true);
	    	mainRS.addRecordListener(this);
	    }
        catch(Exception e){
		  OK = false;
	    }
	    finally{
		  if(OK){
	    	aTextBox.setString("aRS虽未存在，但已创建并完成打开的操作!");
		  }
		  else{
	    	aTextBox.setString("aRS虽未存在,但无法创建,打开文件失败!");
		  }
	    }
	}

    if(OK)
       try{
		   backupRS = RecordStore.openRecordStore("aRS2",true);
	   }
	   catch(Exception e){
	   }
///*
   if(OK)
       try{
	    	nameEmail = "JIDCA=[e-mail]".getBytes();

			mainRS.addRecord(nameEmail,0,nameEmail.length);
			aTextBox.setString("已完成新增记录的操作!");
		  }
	   catch(Exception e){
			aTextBox.setString("新增记录的操作失败!");
	   }

    String result = new String(nameEmail);
	int position = result.indexOf('=');
	result = "姓名:" + result.substring(0,position) + "\n" +
	         "E-mail