vehicleinfofile.java

来自「比较简单的vechilesystem代码还没经过优化」· Java 代码 · 共 64 行

package vehicleinfo;

import java.io.*;
import java.util.ArrayList;

/**
 * Created by IntelliJ IDEA.
 * User: Ray
 * Date: 2008-4-9
 * Time: 21:17:43
 * To change this template use File | Settings | File Templates.
 */
public class VehicleInfoFile {
    private File file=new File("F://Vehicles.txt");//define the file

    public VehicleInfoFile() {
        //if file not exist,create a new file
        try {
            if(!file.exists())
            file.createNewFile();
        }
        //catch IOException
        catch (IOException e) {
            e.printStackTrace();
        }
    }

    //write file
    public void write(ArrayList<Vehicle> vehicles) {
        //write file with object by object
        try {
            FileOutputStream fos = new FileOutputStream(file);
            ObjectOutputStream objOut = new ObjectOutputStream(fos);
            objOut.writeObject(vehicles);
            objOut.close();
            fos.close();
        }
        //catch Exception
        catch(Exception e) {
            e.printStackTrace();
        }
    }

    //read file
    public ArrayList<Vehicle> getAllVehicles() {
        ArrayList<Vehicle> vehicles=new ArrayList<Vehicle>();
        //read file with object by object
        try {
            if (file.length() > 0) {
                FileInputStream fis = new FileInputStream(file);
                ObjectInputStream ois = new ObjectInputStream(fis);
                vehicles= (ArrayList<Vehicle>)ois.readObject();
                ois.close();
                fis.close();
            }
        }
        //catch Exception
        catch(Exception e) {
            e.printStackTrace();
        }
        return vehicles;
    }
}