J2ME开发实例7.rar_j2me

//DataRecordStoreTest.java import javax.microedition.midlet.*; import javax.microedition.lcdui.*; import javax.microedition.rms.* ; import java.io.*; class FriendData { String name ; String tel ; boolean sex ; int age ; public FriendData() { name = "NO NAME" ; name = "NO TEL" ; sex = false ; age = 0 ; } public byte[] encode() { byte[] result = null ; try { ByteArrayOutputStream bos = new ByteArrayOutputStream() ; DataOutputStream dos = new DataOutputStream (bos) ; dos.writeUTF(name) ; dos.writeUTF(tel) ; dos.writeBoolean(sex) ; dos.writeInt(age) ; result = bos.toByteArray() ; dos.close() ; bos.close() ; } catch(Exception e) { } return result ; } public void decode(byte[] data) { try { ByteArrayInputStream bis = new ByteArrayInputStream(data) ; DataInputStream dis = new DataInputStream (bis) ; name = dis.readUTF() ; tel = dis.readUTF() ; sex = dis.readBoolean() ; age = dis.readInt() ; dis.close() ; bis.close() ; } catch(Exception e) { } } } public class DataRecordStoreTest extends MIDlet implements ItemStateListener { private Display display; public DataRecordStoreTest() { display = Display.getDisplay(this); } public void startApp() { String dbname = "testdb" ; Form f = new Form("RS Test") ; RecordStore rs = openRSAnyway(dbname) ; if( rs == null ) { f.append("Table open fail") ; } else { try { FriendData fd = new FriendData() ; fd.name = "李小明" ; fd.tel = "62759933" ; fd.sex = false ; fd.age = 17 ; byte tmp[] = fd.encode() ; int id = rs.addRecord(tmp,0,tmp.length) ; FriendData fd2 = new FriendData() ; fd2.decode(rs.getRecord(id)) ; f.append("姓名:"+ fd2.name) ; f.append("\n 电話:"+ fd2.tel) ; if(fd2.sex) { f.append("\n 性別: 男") ; } else { f.append("\n 性別: 女") ; } f.append("\n 年龄:"+ fd2.age) ; rs.closeRecordStore() ; deleteRS(dbname) ; } catch(Exception e){} display.setCurrent(f) ; } } public void pauseApp() { } public void destroyApp(boolean unconditional) { } public void itemStateChanged(Item item) { } public RecordStore openRSAnyway(String rsname) { RecordStore rs = null ; if(rsname.length() > 32) return null ; try { rs = RecordStore.openRecordStore(rsname,true) ; return rs ; } catch(Exception e) { return null ; } } public boolean deleteRS(String rsname) { if(rsname.length() > 32) return false ; try { RecordStore.deleteRecordStore(rsname) ; } catch(Exception e) { return false ; } return true ; } }