张生工作室

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一个涉及rms查询的简单例子

 

/*
 * 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("查询复杂数据");
        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","张生工作室","Mary","你好","张三","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)
            {
            }
        }
        
        
        
    }
}


张生工作室
posted on 2007-09-10 22:22 张生工作室 阅读(413) 评论(0)  编辑  收藏

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