rms1.java

j2me实例代码

import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;
import javax.microedition.lcdui.*;
import java.lang.Character;
import java.io.*;

import javax.microedition.rms.*;
public class Rms1 extends MIDlet {
    private Display display;
    private RecordStore recordstore=null;
  

    
    RecordEnumeration re;
	public Rms1() {
		super();
		display=Display.getDisplay(this);
	
	}

	protected void startApp() throws MIDletStateChangeException {
		
		try {
			
			recordstore=RecordStore.openRecordStore("store8",true);
			
			

		    String[] outputstring={"first","second","third","four"};
		    boolean[] outputboolean={true,false,true,false};
		    int[] outputint={10,20,40,55};
		    
		    
			for(int i=0;i<4;i++){
				ByteArrayOutputStream os=new ByteArrayOutputStream();
			    DataOutputStream dao=new DataOutputStream(os);
				dao.writeUTF(outputstring[i]);
				dao.writeBoolean(outputboolean[i]);
				dao.writeInt(outputint[i]);
				
				byte[] outputrecord=os.toByteArray();
				
				int s=recordstore.addRecord(outputrecord,0,outputrecord.length);
			    System.out.println("add"+s+" "+outputrecord.length);
				os.flush();
				dao.flush();
		 
				//os.reset();
				os.close();
				dao.close();
				
			}
			
			
		
		} catch (Exception e) {
			
			Form form=new Form("fdsaf");
			form.append(new StringItem(null,"123456789"));
			display.setCurrent(form);
			System.out.println("write");
			e.printStackTrace();
			}
		   
		try{
			StringBuffer buffer=new StringBuffer();
			
			
			re=recordstore.enumerateRecords(null,null,false);
			
			while(re.hasNextElement()){
			    //recordstore.getRecord(re.nextRecordId(),inputdata,0);
				byte[] inputdata=re.nextRecord();
				ByteArrayInputStream is=new ByteArrayInputStream(inputdata);
				DataInputStream dis=new DataInputStream(is);
				buffer.append(dis.readUTF());
				buffer.append("\n");
				buffer.append(dis.readBoolean());
				buffer.append("\n");
				buffer.append(dis.readInt());
				buffer.append("\n");
				is.close();
				dis.close();
	
			}
			Alert alert=new Alert("reading",buffer.toString(),null, AlertType.ERROR);
		    alert.setTimeout(Alert.FOREVER);
		   
		    
		    recordstore.closeRecordStore();
//		    recordstore.deleteRecordStore("store2");
		    display.setCurrent(alert);
		}catch(Exception e){
			Form form=new Form("fdsaf");
			form.append(new StringItem(null,"ri"));
			display.setCurrent(form);
			System.out.println("read");
			e.printStackTrace();
		}

	}

	protected void pauseApp() {
		// TODO Auto-generated method stub
		
	}

	protected void destroyApp(boolean arg0) throws MIDletStateChangeException {
		// TODO Auto-generated method stub
		
	}

}