Java实现目录查找与文本阅读

 1.实现文本阅读
package AllAboutFile;
/**
 *
 * @author lucifer
 */
import java.awt.*;
import java.awt.event.*;
import java.io.*;
public class FileViewer extends Frame implements ActionListener{
     String directory;
     TextArea textarea;                                  //显示文本内容的地方
     public FileViewer(){
          this(null,null);
     }
     public FileViewer(String filename){
          this(null,filename);
     }
     public FileViewer(String directory,String filename){
          super();
          addWindowListener(
               new WindowAdapter(){
                    public void WindowClosing(WindowEvent e){
                         dispose();
                    }
               }
          );
          //Create TextArea
          textarea = new TextArea("",24,80);
          textarea.setFont(new Fo