import java.io.*; import java.util.*; import javax.swing.*; import java.awt.event.*; /**  * 功能: 创建临时文件(在指定的路径下)  */ public class TempFile implements ActionListener {     private File tempPath;     public static void main(String args[]){         TempFile ttf = new TempFile();         ttf.init();         ttf.createUI();     }     //创建UI     public void createUI()     {         JFrame frame = new JFrame();         JButton jb = new JButton("创建临时文件");         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，则创建该文件夹         }     }     //处理事件     public void actionPerformed(ActionEvent e)     {         try         {             //在tempPath路径下创建临时文件"mytempfileXXXX.tmp"             //XXXX 是系统自动产生的随机数, tempPath对应的路径应事先存在             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：如无此关闭语句，文件将不能删除             //tempFile.delete();             tempFile.deleteOnExit();         }         catch(IOException e1)         {             System.out.println(e1);         }     } }