RMS实例_JavaME

import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.DataOutputStream; import java.io.DataInputStream; import java.io.IOException; import javax.microedition.rms.RecordStore; import javax.microedition.rms.RecordEnumeration; import javax.microedition.rms.RecordStoreNotFoundException; import javax.microedition.rms.RecordStoreFullException; import javax.microedition.rms.RecordStoreNotOpenException; import javax.microedition.rms.RecordStoreException; import javax.microedition.lcdui.Form; import javax.microedition.lcdui.CommandListener; import javax.microedition.lcdui.Command; import javax.microedition.lcdui.Displayable; import javax.microedition.lcdui.Display; import javax.microedition.lcdui.TextField; import javax.microedition.midlet.MIDlet; import javax.microedition.midlet.MIDletStateChangeException; public class RMSMIDlet extends MIDlet implements CommandListener { private Form mainForm; private TextField tfSubject; private TextField tfContent; private Command showInfoCom; private Command addRMSCom; private Command clearCom; private Command showRMSCom; private Command deleteRMSCom; private Command exitCom; private RecordStore sodinoRMS; private static String textArr[] = { "RMS Sys", "Subject", "Content", "Input Sub", "Input Content", "SodinoRMS" }; public RMSMIDlet() { // TODO Auto-generated constructor stub tfSubject = new TextField(textArr[1], textArr[3], 20, TextField.ANY); tfContent = new TextField(textArr[2], textArr[4], 100, TextField.ANY); mainForm = new Form(textArr[0]); mainForm.append(tfSubject); mainForm.append(tfContent); showInfoCom = new Command("ShowInfo", Command.SCREEN, 1); addRMSCom = new Command("AddtoRMS", Command.SCREEN, 2); showRMSCom = new Command("ShowRMS", Command.SCREEN, 3); clearCom = new Command("ClearScreen", Command.SCREEN, 4); deleteRMSCom = new Command("DeleteRMS", Command.SCREEN, 5); exitCom = new Command("Exit", Command.EXIT, 0); mainForm.addCommand(showInfoCom); mainForm.addCommand(addRMSCom); mainForm.addCommand(showRMSCom); mainForm.addCommand(clearCom); mainForm.addCommand(deleteRMSCom); mainForm.addCommand(exitCom); mainForm.setCommandListener(this); // 清除之前的记录 try { RecordStore.deleteRecordStore(textArr[5]); } catch (RecordStoreNotFoundException e) { // TODO Auto-generated catch block System.out.println("NOT Found"); } catch (RecordStoreException e) { // TODO Auto-generated catch block e.printStackTrace(); } } protected void destroyApp(boolean arg0) throws MIDletStateChangeException { // TODO Auto-generated method stub } protected void pauseApp() { // TODO Auto-generated method stub } protected void startApp() throws MIDletStateChangeException { // TODO Auto-generated method stub Display d = Display.getDisplay(this); d.setCurrent(mainForm); } public void commandAction(Command c, Displayable d) { if (c.getCommandType() == Command.EXIT) { try { destroyApp(false); } catch (MIDletStateChangeException msce) { System.out.println(msce.toString()); } notifyDestroyed(); } else if (c == showInfoCom) { showInfo(); } else if (c == clearCom) { clearScreen(); } else if (c == addRMSCom) { openRMS(); String infoSubject = tfSubject.getString(); String infoContent = tfContent.getString(); String textAdded = infoSubject + ":" + infoContent; addtoRMS(textAdded); closeRMS(); } else if (c == showRMSCom) { openRMS(); showRMS(); closeRMS(); } else if (c == deleteRMSCom) { deleteRMS(); } } private void showInfo() { String subText = tfSubject.getString(); String conText = tfContent.getString(); mainForm.append(textArr[1] + ":" + subText); mainForm.append("\n"); mainForm.append(textArr[2] + ":" + conText); System.out.println("Subject :" + subText + " \n" + "Content : " + conText); } private void showInfo(String infoStr) { mainForm.append("\n" + infoStr); } private void clearScreen() { int size = mainForm.size(); // 倒序删除,0、1为Subject和Content不删除 for (int i = size - 1; i > 1; i--) { mainForm.delete(i); } tfSubject.setString(textArr[0]); tfContent.setString(textArr[1]); } private void openRMS() { String exceptionString = ""; try { sodinoRMS = RecordStore.openRecordStore(textArr[5], true); } catch (RecordStoreNotFoundException rsnfe) { exceptionString += "RecordStoreNotFound"; } catch (RecordStoreFullException rsfe) { exceptionString += "RecordStoreFull"; } catch (RecordStoreException rse) { exceptionString += "RecordStoreException"; } finally { if (exceptionString.equals("") == false) { showException(exceptionString + " openRMS"); } } } private void addtoRMS(String info) { ByteArrayOutputStream baos = new ByteArrayOutputStream(); DataOutputStream dos = new DataOutputStream(baos); try { dos.writeUTF(info); dos.close(); baos.close(); } catch (IOException ioe) { String exceptionStr = "IOException occured when dos.writeUTF or closed"; showException(exceptionStr + " addtoRMS"); } byte[] data = baos.toByteArray(); String exceptionStr = ""; try { int sequence = sodinoRMS.addRecord(data, 0, data.length); System.out.println(sequence); } catch (RecordStoreFullException rsfe) { exceptionStr += " RecordStoreFullException"; } catch (RecordStoreNotFoundException rsnfe) { exceptionStr += " RecordStoreNotFoundException"; } catch (RecordStoreException rse) { exceptionStr += " RecordStoreException"; } finally { if (exceptionStr.equals("") == false) { showException(exceptionStr + " addtoRMS"); } } } private String getRecord(byte[] array) { String strTemp = null; ByteArrayInputStream bais = new ByteArrayInputStream(array); DataInputStream dis = new DataInputStream(bais); try { strTemp = dis.readUTF(); dis.close(); bais.close(); } catch (IOException e) { showException("FirstIOException" + " getRecord"); } return strTemp; } private void showRMS() { String mainText = ""; String exceptionStr = ""; try { RecordEnumeration re = sodinoRMS.enumerateRecords(null, null, true); int recordSize = re.numRecords(); showInfo("Record Num: " + recordSize); while (re.hasNextElement()) { byte[] data = re.nextRecord(); mainText = getRecord(data); showInfo(mainText); } } catch (RecordStoreNotOpenException rsnoe) { exceptionStr += "RecordStoreNotOpen"; } catch (RecordStoreFullException rsfe) { exceptionStr += " RecordStoreFull"; } catch (RecordStoreNotFoundException rsnfe) { exceptionStr += " RecordStoreNotFound"; } catch (RecordStoreException rse) { exceptionStr += " RecordStoreException"; } finally { if (exceptionStr.equals("") == false) { showException(exceptionStr + " showRMS"); } } } private void closeRMS() { String exceptionStr = ""; try { sodinoRMS.closeRecordStore(); } catch (RecordStoreNotOpenException rsnoe) { exceptionStr += "RecordStoreNotOpenException"; } catch (RecordStoreException e) { exceptionStr += " RecordStoreNotOpenException"; } finally { if (exceptionStr.equals("") == false) { showException(exceptionStr + " closeRMS"); } } } private void deleteRMS() { String exceptionStr = ""; try { RecordStore.deleteRecordStore(textArr[5]); } catch (RecordStoreNotFoundException rsnfe) { exceptionStr += "RecordStoreNotFoundException"; } catch (RecordStoreException rse) { exceptionStr += "RecordStoreException"; } finally { if (exceptionStr.equals("") == false) { showException(exceptionStr + " deleteRMS"); } else { showException("RMS deleted!"); } }