Using JEditorPane to open a text file

Question

I am trying to open a text file in a frame using JEditorPane (in an non-editable mode). However, I believe I am having problems with setting up my input stream and output stream. Kindly, look at my code and tell where I am doing wrong.

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


public class TextEditor extends JFrame{

private JEditorPane editorpane;
JScrollPane editorScrollPane;
String filename="D:\\abc.txt";
Reader filereader;

public TextEditor()
{       
        editorpane= new JEditorPane();
        editorpane.setEditable(false);

        if (filename != null) 
        {
            try 
            {
                filereader=new FileReader(filename);
                editorpane.setPage(filename);
            }

            catch (IOException e) 
            {
                System.err.println("Attempted to read a bad file " + filename);
            }
         }

        else
        {
            System.err.println("Couldn't find file");
        }

        //Put the editor pane in a scroll pane.
        editorScrollPane = new JScrollPane(editorpane);
            editorScrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
        editorScrollPane.setPreferredSize(new Dimension(250, 145));
        editorScrollPane.setMinimumSize(new Dimension(10, 10));

}

public static void main(String[] args) 
{
    TextEditor obj= new TextEditor();
    obj.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    obj.setSize(600,600);
    obj.setLocation(100,100);
    obj.setVisible(true);
}
}

you should rather print the message of the IOException. This will give you a true hint on what is going on: Access denied? File not found? Disk error? — Guillaume Polet, Sep 18 '12 at 14:01
Thanks for this tip. Now the error message is : java.io.FileNotFoundException: file:\D:\abc.txt (The filename, directory name, or volume label syntax is incorrect) — OneMoreError, Sep 18 '12 at 14:07
possible duplicate of [Opening a text file in a frame using swing components](http://stackoverflow.com/questions/12477579/opening-a-text-file-in-a-frame-using-swing-components) — trashgod, Sep 18 '12 at 14:12

Reimeus · Accepted Answer · 2012-09-18T14:42:12.420

5

To get the argument as a URL for JEditorPane.setPage, you could use:

File file = new File(filename);
editorpane.setPage(file.toURI().toURL());

Also don't forget to add your JEditorPane to the frame so that it can be seen:

add(editorScrollPane);

To view the disk error you're getting add:

e.printStackTrace();

to the IOException block.

edited Sep 18 '12 at 14:42

answered Sep 18 '12 at 13:56

Reimeus

158,255
15
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Still the same error : Attempted to read a bad file file:\D:\abc.txt – OneMoreError Sep 18 '12 at 13:57
Yes, the file exists. I am able to open the file by doing this on the command prompt : D:\>abc.txt – OneMoreError Sep 18 '12 at 14:05
Now after so much of your help, error messages are gone. But still my frame does not open the file. Simply a blank frame appears. – OneMoreError Sep 18 '12 at 14:14

score 2 · Answer 2 · answered Sep 18 '12 at 13:53

2

editorpane.getEditorKit().read(filereader, editorpane.getDocument(), 0);

answered Sep 18 '12 at 13:53

StanislavL

56,971
9
68
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Still the same error : Attempted to read a bad file file:\D:\abc.txt – OneMoreError Sep 18 '12 at 13:56

Andreas Fester · Answer 3 · 2012-09-18T14:16:47.997

JEditorPane.setPage() expects an URL, including the protocol: try "file:///D:/abc.txt". The following code should work:

String filename="file:///D:/abc.txt";

public TextEditor()
{
        editorpane= new JEditorPane();
        editorpane.setEditable(false);

        if (filename != null)
        {
            try
            {
                editorpane.setPage(filename);
            }

            catch (IOException e)
            {
                System.err.println("Attempted to read a bad file " + filename );
                e.printStackTrace();
            }
         }

        else
        {
            System.err.println("Couldn't find file");
        }

        //Put the editor pane in a scroll pane.
        editorScrollPane = new JScrollPane(editorpane);
            editorScrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
        editorScrollPane.setPreferredSize(new Dimension(250, 145));
        editorScrollPane.setMinimumSize(new Dimension(10, 10));
      getContentPane().add(editorScrollPane);

}

Even on doing as you said, still there is the same error message : Attempted to read a bad file file:\D:\abc.txt — OneMoreError, Sep 18 '12 at 13:55
You also need to remove the creation of the FileReader() - you do not use it anyway, and it will throw an IOError since it expects a pure filename, not an URL — Andreas Fester, Sep 18 '12 at 14:10
Finally, you also need to add `getContentPane().add(editorScrollPane);` at the end of the TextEditor constructor, otherwise you will not see anything... — Andreas Fester, Sep 18 '12 at 14:14

Using JEditorPane to open a text file

3 Answers3