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2007年9月

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一個(gè)涉及rms查詢的簡單例子

/*

* ComplexFind.java

*

* Created on 2007年9月10日, 下午8:31

*/

import java.io.ByteArrayInputStream;

import java.io.ByteArrayOutputStream;

import java.io.DataInputStream;

import java.io.DataOutputStream;

import javax.microedition.midlet.*;

import javax.microedition.lcdui.*;

import javax.microedition.rms.RecordEnumeration;

import javax.microedition.rms.RecordFilter;

import javax.microedition.rms.RecordStore;

import javax.microedition.rms.RecordStoreException;

/**

*

* @author Administrator

* @version

*/

public class ComplexFind extends MIDlet implements javax.microedition.lcdui.CommandListener {

private Display display;

private Form form;

private Alert alert;

private Command exit;

private Command start;

private RecordStore recordstore =null;

private RecordEnumeration recordenumeration=null;

private Filter filter;

public ComplexFind()

{

display =Display.getDisplay(this);

exit=new Command("Exit",Command.SCREEN,1);

start=new Command("Start",Command.SCREEN,1);

form=new Form("查詢復(fù)雜數(shù)據(jù)");

form.addCommand(exit);

form.addCommand(start);

form.setCommandListener(this);

}

public void startApp() {

display.setCurrent(form);

}

public void pauseApp() {

}

public void destroyApp(boolean unconditional) {

}

public void commandAction(Command command, Displayable displayable) {

if(command==exit)

{

destroyApp(false);

notifyDestroyed();

}

else if(command==start)

{

try {

recordstore=RecordStore.openRecordStore("myRecordStore",true);

} catch (RecordStoreException ex) {

alert=new Alert("Error",ex.toString(),null,AlertType.WARNING);

ex.printStackTrace();

}

try

{

byte[] outputRecord=null;

String[] outputString={"Adam","張生工作室","Mary","你好","張三","有鬼魂"};

int outputInteger[]={15,10,5,78,23,32};

ByteArrayOutputStream outputStream=new ByteArrayOutputStream();

DataOutputStream outputDataStream=new DataOutputStream(outputStream);

for(int i=0 ; i<outputString.length;i++)

{

outputDataStream.writeUTF(outputString[i]);

outputDataStream.writeInt(outputInteger[i]);

outputDataStream.flush();

outputRecord=outputStream.toByteArray();

recordstore.addRecord(outputRecord,0,outputRecord.length);

outputStream.reset();

}

outputStream.close();

outputDataStream.close();

}

catch(Exception e)

{

alert=new Alert("Error",e.toString(),null,AlertType.ERROR);

}

try

{

String inputString;

byte[] byteInputData=new byte[300];

ByteArrayInputStream inputStream=new ByteArrayInputStream(byteInputData);

DataInputStream inputDataStream=new DataInputStream(inputStream);

if(recordstore.getNumRecords()>0)

{

filter=new Filter("三");

recordenumeration=recordstore.enumerateRecords(filter,null,false);

while(this.recordenumeration.hasNextElement())

{

recordstore.getRecord(this.recordenumeration.nextRecordId(),byteInputData,0);

inputString=inputDataStream.readUTF()+" "+inputDataStream.readInt();

alert=new Alert("Reading",inputString,null,AlertType.WARNING);

alert.setTimeout(Alert.FOREVER);

display.setCurrent(alert);

}

inputStream.close();

}

catch(Exception e)

{

}

try

{

this.recordstore.closeRecordStore();

}

catch(Exception e)

{

}

if(this.recordstore.listRecordStores()!=null)

try

{

RecordStore.deleteRecordStore("myRecordStore");

filter.filterClose();

this.recordenumeration.destroy();

}

catch(Exception e)

{

}

class Filter implements RecordFilter

{

private String search=null;

private ByteArrayInputStream inputstream=null;

private DataInputStream datainputstream=null;

public Filter(String str)

{

this.search=str;

}

public boolean matches(byte[] b) {

String string=null;

try

{

String stra=b.toString();

inputstream=new ByteArrayInputStream(b);

datainputstream=new DataInputStream(inputstream);

string=datainputstream.readUTF();

}

catch(Exception e)

{

return false;

}

if (string!=null&&string.indexOf(this.search)!=-1)

{

return true;

}

else

return false;

}

public void filterClose()

{

try

{

if (inputstream!=null)

{

inputstream.close();

}

if(datainputstream!=null)

{

datainputstream.close();

}

catch(Exception e)

{

}

張生工作室

posted on 2007-09-10 22:22 張生工作室閱讀(422) 評(píng)論(0) 編輯收藏

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