swing重定向输出到jtextArea

import java.awt.Font;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.SwingUtilities;
public class reDirect 
{/*
 * Console重定向到JTextArea
 */
public reDirect()
{JFrame jf=new JFrame();
jf.setBounds(100,100,700,400);
JTextArea jta=new JTextArea();
jta.setFont(new Font(null,Font.BOLD,20));
jta.setEditable(false);//设置不可编辑
JTextAreaOutputStream out = new JTextAreaOutputStream (jta);
System.setOut (new PrintStream (out));//设置输出重定向 
System.setErr(new PrintStream(out));//将错误输出也重定向,用于e.pritnStackTrace
JScrollPane jsp=new JScrollPane(jta);//设置滚动条
jf.add(jsp);jf.setVisible(true);
}
public static void main(String[] args){
reDirect rd=new reDirect();
System.out.println("重定向");
System.out.println(12345);
System.out.println(true);
try{
int[] s={1,2,3,4,5};
int i=s[8];
}catch(Exception e){
e.printStackTrace();
}
}
}
class JTextAreaOutputStream extends OutputStream
{
    private final JTextArea destination;


    public JTextAreaOutputStream (JTextArea destination)
    {
        if (destination == null)
            throw new IllegalArgumentException ("Destination is null");


        this.destination = destination;
    }
    @Override
    public void write(byte[] buffer, int offset, int length) throws IOException
    {
        final String text = new String (buffer, offset, length);
        SwingUtilities.invokeLater(new Runnable ()
            {
                @Override
                public void run() 
                {
                    destination.append (text);
                }
            });
    }
    @Override
    public void write(int b) throws IOException
    {
        write (new byte [] {(byte)b}, 0, 1);
    }
}