How to redirect all console output to a Swing JTextArea/JTextPane with the right encoding?

Question

I've been trying to redirect System.out PrintStream to a JTextPane. This works fine, except for the encoding of special locale characters. I found a lot of documentation about it (see for ex. mindprod encoding page), but I'm still fighting with it. Similar questions were posted in StackOverFlow, but the encoding wasn't addressed as far as I've seen.

First solution:

String sUtf = new String(s.getBytes("cp1252"),"UTF-8");

Second solution should use java.nio. I don't understand how to use the Charset.

Charset defaultCharset = Charset.defaultCharset() ;
byte[] b = s.getBytes();
Charset cs = Charset.forName("UTF-8");
ByteBuffer bb = ByteBuffer.wrap( b );
CharBuffer cb = cs.decode( bb );
String stringUtf = cb.toString();
myTextPane.text = stringUtf

Neither solution works out. Any idea?

Thanks in advance, jgran

Solution 1

Try this code:

public class MyOutputStream extends OutputStream {

private PipedOutputStream out = new PipedOutputStream();
private Reader reader;

public MyOutputStream() throws IOException {
    PipedInputStream in = new PipedInputStream(out);
    reader = new InputStreamReader(in, "UTF-8");
}

public void write(int i) throws IOException {
    out.write(i);
}

public void write(byte[] bytes, int i, int i1) throws IOException {
    out.write(bytes, i, i1);
}

public void flush() throws IOException {
    if (reader.ready()) {
        char[] chars = new char[1024];
        int n = reader.read(chars);

        // this is your text
        String txt = new String(chars, 0, n);

        // write to System.err in this example
        System.err.print(txt);
    }
}

public static void main(String[] args) throws IOException {

    PrintStream out = new PrintStream(new MyOutputStream(), true, "UTF-8");

    System.setOut(out);

    System.out.println("café résumé voilà");

}

}

Solution 2

You should create the PrintStream with the right encode: http://www.j2ee.me/j2se/1.5.0/docs/api/java/io/PrintStream.html#PrintStream(java.io.File, java.lang.String)

Could you please provide more code about what are you trying to do?

Comments

[Admin]

Thanks a lot for your solution which could be quickly adapted to my own problem. Regards.

[TheRealChx101]

Does write() automatically call flush()?

[gwentech]

@chx101, write() does not call flush() but PrintStream does for each new line. Please note that the implementation of the flush() in the example above uses char buffer of 1024 - which is not suitable for the prod use.