import java.io.*;
import java.util.*;
import javax.swing.*;
import java.awt.event.*;
/**
 * 功能: 創建臨時文件(在指定的路徑下)
 */
public class TempFile implements ActionListener
{
    private File tempPath;
    public static void main(String args[]){
        TempFile ttf = new TempFile();
        ttf.init();
        ttf.createUI();
    }
    //創建UI
    public void createUI()
    {
        JFrame frame = new JFrame();
        JButton jb = new JButton("創建臨時文件");
        jb.addActionListener(this);
        frame.add(jb,"North");
        frame.setSize(200,100);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }
    //初始化
    public void init(){
        tempPath = new File("./temp");
        if(!tempPath.exists() || !tempPath.isDirectory())
        {
            tempPath.mkdir();  //如果不存在，則創建該文件夾
        }
    }
    //處理事件
    public void actionPerformed(ActionEvent e)
    {
        try
        {
            //在tempPath路徑下創建臨時文件"mytempfileXXXX.tmp"
            //XXXX 是系統自動產生的隨機數, tempPath對應的路徑應事先存在
            File tempFile = File.createTempFile("mytempfile", ".txt", tempPath);
            System.out.println(tempFile.getAbsolutePath());
            FileWriter fout = new FileWriter(tempFile);
            PrintWriter out = new PrintWriter(fout);
            out.println("some info!" );
            out.close(); //注意：如無此關閉語句，文件將不能刪除
            //tempFile.delete();
            tempFile.deleteOnExit();
        }
        catch(IOException e1)
        {
            System.out.println(e1);
        }
    }
}