readatmid.java

来自「课程设计：ATM Project源码」· Java 代码 · 共 70 行

import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
public class ReadAtmID
{     
     private long CurNumber;
     private File IdFile = new File("atmid.txt");
     private File CardFile= new File("A:\\atm.sys");
     private long CurCardID;
     Component f;
     public ReadAtmID(Component ComponentF)
     {
     	f=ComponentF;
     }
     
     public boolean WriteCardID(long id)    	
     {
     	try
     	{
     		RandomAccessFile AtmCard=new RandomAccessFile(CardFile,"rw");
     	    AtmCard.writeLong(id);
     	    JOptionPane.showMessageDialog(f, "制卡设备成功将用户信息写入ATM卡中！", "提示:", JOptionPane.INFORMATION_MESSAGE);

     	}
     	catch(IOException e)
        {return false;} 
          
        return true;
     }
     
     public long ReadCardID(JButton btConfirm)
     {
     	try
     	{
        	RandomAccessFile AtmCard=new RandomAccessFile(CardFile,"r");	
         	AtmCard.seek(0);
     	    CurCardID=AtmCard.readLong();
     	    btConfirm.setEnabled(true);
     	}
        catch(FileNotFoundException e)
        { JOptionPane.showMessageDialog(f, "读卡出错!请检查ATM卡是否已经正确插入!", "警告", JOptionPane.ERROR_MESSAGE);
        }
        catch(IOException e)
        { JOptionPane.showMessageDialog(f, "读卡出错!请检查ATM卡是否已经正确插入!", "警告", JOptionPane.ERROR_MESSAGE);
        }
     	return CurCardID;
     }
     
     public long getid()
     {  
        try{
        RandomAccessFile inData=new RandomAccessFile(IdFile,"rw");	
     	inData.seek(0);
     	CurNumber=inData.readLong();
     	//System.out.println(CurNumber);
     	
     	inData.seek(0);
     	inData.writeLong(CurNumber+1);
     	
        }
        catch(FileNotFoundException e)
        {}
        catch(IOException e)
        {}
        return CurNumber;
     }
}