DisplayFile.java **************** import java.awt.*; import java.awt.event.*; import java.io.*; /** Uses a FileDialog to choose the file to display. *************** public class DisplayFile extends CloseableFrame implements ActionListener { public static void main(String[] args) { new DisplayFile(); } private Button loadButton; private TextArea fileArea; private FileDialog loader; public DisplayFile() { super("Using FileDialog"); loadButton = new Button("Display File"); loadButton.addActionListener(this); Panel buttonPanel = new Panel(); buttonPanel.add(loadButton); add(buttonPanel, BorderLayout.SOUTH); fileArea = new TextArea(); add("Center", fileArea); loader = new FileDialog(this, "Browse", FileDialog.LOAD); // Default file extension: .java. loader.setFile("*.java"); setSize(350, 450); setVisible(true); } /** When the button is clicked, a file dialog is opened. When * the file dialog is closed, load the file it referenced. */ public void actionPerformed(ActionEvent event) { loader.show(); displayFile(loader.getFile()); } public void displayFile(String filename) { try { File file = new File(filename); FileInputStream in = new FileInputStream(file); int fileLength = (int)file.length(); byte[] fileContents = new byte[fileLength]; in.read(fileContents); String fileContentsString = new String(fileContents); fileArea.setText(fileContentsString); } catch(IOException ioe) { fileArea.setText("IOError: " + ioe); } } } ************* CloseableFrame.java. ************* import java.awt.*; import java.awt.event.*; /** A Frame that you can actually quit. Used as the starting * point for most Java 1.1 graphical applications. ********************** public class CloseableFrame extends Frame { public CloseableFrame(String title) { super(title); enableEvents(AWTEvent.WINDOW_EVENT_MASK); } /** Since we are doing something permanent, we need * to call super.processWindowEvent first. */ public void processWindowEvent(WindowEvent event) { super.processWindowEvent(event); // Handle listeners. if (event.getID() == WindowEvent.WINDOW_CLOSING) { // If the frame is used in an applet, use dispose(). System.exit(0); } } }
Uses a FileDialog to choose the file to display
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