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Question

I want to use "telnet" in java program in this way:
1.run telnet(such as using runtime class)
2.wait for the '>'
3.input : open www.website.....
So I thought out a way to use I/O redirection
I redirect the output stream of telnet into the JTextArea to show the output,
and I can see the output.
Next I wait for the output of '>', but failed in my program.
I don't know why.....
I want to wait for the '>', so I can input using the directed input I/O.
1.Exe_test.java
public class Exe_test extends JTextArea {
    private boolean keepRunning = true;
    OutputStream shellstream;
    public Exe_test(InputStream[] inStreams,OutputStream mystream) {
        for(int i = 0; i < inStreams.length; ++i)
            startConsoleReaderThread(inStreams);
shellstream = mystream;
private void startConsoleReaderThread(
InputStream inStream){
final BufferedReader br =
new BufferedReader(new InputStreamReader(inStream));
new Thread(new Runnable() {
public void run() {
try {
Thread.sleep(6000);
} catch (InterruptedException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
StringBuffer sb = new StringBuffer();
OutputStreamWriter my = new OutputStreamWriter(shellstream);
try {
my.write("ping bbs.fudan.edu.cn");
System.out.println("dasdad");
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
while(keepRunning)
try {
String s;
Document doc = getDocument();
while((s = br.readLine()) != null) {
System.out.println("hello");
boolean caretAtEnd = false;
caretAtEnd = getCaretPosition() == doc.getLength() ?
true : false;
sb.setLength(0);
append(sb.append(s).append("\n").toString());
System.out.println(s);
if(caretAtEnd)
setCaretPosition(doc.getLength());
catch(IOException e) {
JOptionPane.showMessageDialog(null,
"from BufferedReader error:" + e);
System.exit(1);
}).start();
2.AppOutputCapture.java
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;
public class AppOutputCapture {
    private static Process process;
    public static void main(String[] args) {
        try {
            process = Runtime.getRuntime().exec("nslookup");
                    //"C:\\agfl_2.3.0\\epforir-2.3\\epforir.exe");
        } catch (IOException e) {
            System.err.println("init error...\n" + e);
            System.exit(1);
        InputStream[] inStreams = new InputStream[] { process.getInputStream()};//,
                //process.getErrorStream() };
        OutputStream sentence = process.getOutputStream();
        Exe_test cta = new Exe_test(inStreams,sentence);
        cta.setFont(java.awt.Font.decode("monospaced"));
        JFrame frame = new JFrame("console output");
        frame.getContentPane().add(new JScrollPane(cta), BorderLayout.CENTER);
        frame.setBounds(50, 50, 400, 400);
        frame.setVisible(true);
        frame.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent evt) {
                process.destroy();
                try {
                    process.waitFor();
                } catch (InterruptedException e) {
                System.exit(0);
    } // main()
} // AppOutputCapture

Answer 1

I just get confused about the I/O redirection of the
telnet , why can't I get what I want.
I just don't uinderstand why you would want a kuldgy solution....
If you really feel you must then look at this: When Runtime.exec() won't: Navigate yourself around pitfalls related to the Runtime.exec() method