displayfile.java

来自「java源程序 对初学者有很大的帮助 从简单到复杂」· Java 代码 · 共 50 行

//********************************************************************
//  DisplayFile.java       Author: Lewis/Loftus
//
//  Demonstrates the use of a file chooser and a text area.
//********************************************************************

import java.io.*;
import javax.swing.*;

public class DisplayFile
{
   //-----------------------------------------------------------------
   //  Opens a file chooser dialog, reads the selected file and
   //  loads it into a text area.
   //-----------------------------------------------------------------
   public static void main (String[] args) throws IOException
   {
      JFrame frame = new JFrame ("Display File");
      frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);

      JTextArea ta = new JTextArea (20, 30);
      JFileChooser chooser = new JFileChooser();

      int status = chooser.showOpenDialog (null);

      if (status != JFileChooser.APPROVE_OPTION)
         ta.setText ("No File Chosen");
      else
      {
         File file = chooser.getSelectedFile();
         FileReader fr = new FileReader (file);
         BufferedReader inFile = new BufferedReader (fr);

         String info = "";
         String line = inFile.readLine();
         while (line != null)
         {
            info += line + "\n";
            line = inFile.readLine();
         }

         ta.setText (info);
      }

      frame.getContentPane().add (ta);
      frame.pack();
      frame.show();
   }
}