Loading, saving and displaying text - An Introduction to Graphical User Interfaces with Java Swing - page 100

JEditorPane() constructs an editor pane.

read(Reader myReader, Object description) reads the text supplied by
myReader and displays it in the editor area. In the second argument descrip-
tion further information on the type of text can be given; we do not use this
here, i.e. we set description = null .
getText() returns the text currently displayed in the editor area as one string,
including the line-end characters.

The following listing TextDisplayFrame implements a text display. We derive a
TextDisplayFrame from SimpleFrame and glue a JEditorPane into it as a cen-
tral component. The constructor gets a file name as a string. It constructs a file
readfile with this name. As in Section 10.1.3 a FileReader for file readfile
is created. This reader is then passed to the read -method of JEditorPane . The
pane then starts the reader and the text is displayed in the JEditorPane . Class
TextDisplayDriver is just the start class.

File: its/TextDisplay/TextDisplayFrame.java

1. package its.TextDisplay;
2.
3. import its.SimpleFrame.SimpleFrame;
4. import java.io.File;
5. import java.io.FileReader;
6. import java.io.IOException;
7. import javax.swing.JEditorPane;
8. import java.awt.BorderLayout;
9.
10. public class TextDisplayFrame extends SimpleFrame
11. {
12.

private JEditorPane textDisplayPane;

13.
14.

public TextDisplayFrame(String filename)

15.

{

16.

textDisplayPane = new JEditorPane();

17.

this .getContentPane().add(textDisplayPane,BorderLayout.CENTER);

18.

this .setSize(200,160);

19.
20.

File readfile = new File(filename);

21.
22. try {

23. FileReader fr = new FileReader(readfile);

24. textDisplayPane.read(fr, null );

25. } catch (IOException e){

26. System.out.println("Problems opening or reading "

+readfile.getPath());