J2ME RMS Read Write
This Application specially tries to explain how to read and write the data using
RecordStore class. In the RecordStore class the following methods are available:
- addRecord(byte[] data, int offset, int numBytes)
- addRecordListener(RecordListener listener)
- closeRecordStore()
- deleteRecord(int recordId)
- deleteRecordStore(String recordStoreName)
- enumerateRecords(RecordFilter filter, RecordComparator comparator, boolean
keepUpdated)
- getLastModified()
- getName()
- getNextRecordID()
- getNumRecords()
- getRecord(int recordId)
- getRecord(int recordId, byte[] buffer, int offset)
- getRecordSize(int recordId)
- getSize()
- getSizeAvailable()
- getVersion()
- listRecordStores()
- openRecordStore(String recordStoreName, boolean createIfNecessary)
- removeRecordListener(RecordListener listener)
- setRecord(int recordId, byte[] newData, int offset, int numBytes)
The Application is as follows:
ReadWriteRMS.java
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.io.*;
import javax.microedition.rms.*;
public class ReadWriteRMS extends MIDlet{
private RecordStore rs = null;
static final String REC_STORE = "ReadWriteRMS";
public void startApp(){
openRecStore();
writeRecord("Core J2ME Technology");
writeRecord("J2ME Wireless Toolkit");
readRecords();
closeRecStore();
deleteRecStore();
}
public void pauseApp(){}
public void destroyApp(boolean unconditional){
notifyDestroyed();
}
public void openRecStore(){
try{
rs = RecordStore.openRecordStore(REC_STORE, true );
}catch (Exception e){}
}
public void closeRecStore(){
try{
rs.closeRecordStore();
}catch (Exception e){}
}
public void deleteRecStore(){
if (RecordStore.listRecordStores() != null){
try{
RecordStore.deleteRecordStore(REC_STORE);
}catch (Exception e){}
}
}
public void writeRecord(String str){
byte[] rec = str.getBytes();
try{
rs.addRecord(rec, 0, rec.length);
}catch (Exception e){}
}
public void readRecords(){
try{
byte[] recData = new byte[5];
int len;
for(int i = 1; i <= rs.getNumRecords(); i++){
if(rs.getRecordSize(i) > recData.length){
recData = new byte[rs.getRecordSize(i)];
}
len = rs.getRecord(i, recData, 0);
System.out.println("------------------------------");
System.out.println("Record " + i + " : " +
new String(recData, 0, len));
System.out.println("------------------------------");
}
}catch (Exception e){}
}
}
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