java - Telnet Java 套接字测试

Question

我需要一些指导。不确定我是否走在正确的道路上，但我认为是的。我正在尝试创建一个 telnet java 程序，它将连接到客户端计算机，执行单个命令然后断开连接。当我连接到 Linux 机器或我的路由器时，我能够让程序运行并将 InputStream 读出到文本字段(用于测试目的)。但是当我连接到 Windows 机器或其他客户端计算机时，它不起作用。它会读出一些随机字符，然后锁定。

下面是我的代码。我已经看到了其他代码的示例以及来自 Apache 的 API。我真的很想看看我是否可以让它仅与 Java 套接字一起工作。

    public class TestSockets extends JFrame implements ActionListener {

/**
 * @param args
 */
private String USER = "User";
private String PASS = "Password01";
private final static String CMD = "exit\r\n";
private static Socket telnet = null;
private PrintWriter writer = null;
private static InputStream reader = null;
private String host = "192.168.1.1";
private int port = 23;
TextArea javatext;

public static void main(String[] args) {
    // TODO Auto-generated method stub
    new TestSockets().setVisible(true);
}

private TestSockets() {
    super("Testing Buttons");

    //Set JFrame size
    setSize(500, 600);

    //Gives JFrame a location
    setLocation(100, 100);

    //set layout
    setLayout(new FlowLayout());

    javatext = new TextArea(25, 65);

    add(javatext);

    //Ask for window decorations provided by the look and feel.
    JFrame.setDefaultLookAndFeelDecorated(true);
    JButton button3 = new JButton("Run Program");
    button3.addActionListener(this);
    add(button3);
}

@Override
public void actionPerformed(ActionEvent arg0) {
    // TODO Auto-generated method stub
    try {
        telnet = new Socket(host, port);
        telnet.setKeepAlive(true);
        //reader = telnet.getInputStream();
        writer = new PrintWriter(telnet.getOutputStream());
        reader = telnet.getInputStream();
        //out = telnet.getOutputStream();
        //Process p = Runtime.getRuntime().exec("telnet " + server.toString(), null, null);
        //DataOutputStream os = new DataOutputStream(p.getOutputStream());
        //DataInputStream in = new DataInputStream(p.getInputStream());

        StringBuilder sb = new StringBuilder();
        byte[] buffer = new byte[4096]; // Read 4K characters at a time
        int len; // How many chars read each time
          while ((len = reader.read(buffer)) != -1) {
             String readchar = new String(buffer, 0, len);
             sb.append(readchar + "\n");
             System.out.println(readchar);
             javatext.append(readchar);
             if (readchar.endsWith("login: ")) {
                 writer.print(USER + "\r\n");
                 writer.flush();
             }
             if (readchar.endsWith("Password: ")) {
                 writer.print(PASS + "\r\n");
                 writer.flush();
             }
             if (readchar.endsWith("password: ")) {
                 writer.print(PASS + "\r\n");
                 writer.flush();
             }
             if (readchar.endsWith("# ")) {
                 writer.print(CMD);
                 writer.flush();
             }
             if (readchar.endsWith("# ")) {
                 writer.print(CMD);
                 writer.flush();
             }

         }          
} catch (SocketException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();    
} catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}
}

    }

Answer 1

感谢大家的帮助。我真的很想让它在 Android 中运行，但只是在直接 Java 应用程序中制作了一个粗略的草稿。我有一个粗略的想法并且它有效。如果我读取输出，它只会一遍又一遍地重复我的 StringBuilder 中的所有字符。没什么大不了的，反正我真的不想显示输出。这是我完成的。如果需要，希望这对其他人有帮助。

public class AndroidSocket extends Activity implements OnClickListener {

TextView text;
EditText edit1, edit2, edit3, edit4;
private String USER = null;
private String PASS = null;
Editable server, username, password, command;
private String CMD = null;
private PrintStream writer = null;
private static BufferedReader reader = null;
private String host = null;
private int port = 23;
private TelnetClient telnet = new TelnetClient();
private InputStream in;
private PrintStream out;
StringBuffer sb;
Handler mHandler = new Handler();
int len; 

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    text = (TextView)findViewById(R.id.text);
    edit1 = (EditText)findViewById(R.id.edit1);
    edit2 = (EditText)findViewById(R.id.edit2);
    edit3 = (EditText)findViewById(R.id.edit3);
    edit4 = (EditText)findViewById(R.id.edit4);

    server = edit1.getEditableText();
    username = edit2.getEditableText();
    password = edit3.getEditableText();
    command = edit4.getEditableText();

    Button button = (Button)findViewById(R.id.button);
    button.setOnClickListener(this);
    text.setText("Android Socket" + "\n");
    }

@Override
public void onClick(View arg0) {
    // TODO Auto-generated method stub
    text.setText("Android Socket" + "\n");
    try {
        telnet.connect(server.toString(), 23);
        in = telnet.getInputStream();
        out = new PrintStream(telnet.getOutputStream());
        reader = new BufferedReader(new InputStreamReader(telnet.getInputStream()));
        writer = new PrintStream(telnet.getOutputStream());
    telnet.setKeepAlive(true);
    Thread mThread = new Thread(new Runnable() {

        @Override
        public void run() {
            // TODO Auto-generated method stub
             try {
                 sb = new StringBuffer();
                 //char[] buffer = new char[1024];
                    while (true)
                    { 
                            len = in.read();
                            String s = Character.toString((char)len);
                            sb.append( s );
                            AndroidSocket.this.mHandler.post(new Runnable(){

                                @Override
                                public void run() {
                                    // TODO Auto-generated method stub
                                    AndroidSocket.this.text.getText();
                                    AndroidSocket.this.text.append( sb.toString() );
                                }

                            });
                            System.out.println( sb );
                            mylogin();
                            mypass();
                            mycommand();
                        }
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
        }

    });
    mThread.start();
    }
    catch (Exception e) {
    e.printStackTrace();
    }
}

     private void mycommand() throws IOException {
            // TODO Auto-generated method stub
if (sb.toString().endsWith("> ")) {
    out.println(command.toString() + "\r\n");
    out.flush();
    out.println("exit\r\n");
    out.flush();
    try {
        TimeUnit.SECONDS.sleep(10);
    } catch (InterruptedException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    disconnect();
} else
if (sb.toString().endsWith("# ")) {
    out.println(command.toString() + "\r\n");
    out.flush();
    out.println("exit\r\n");
    out.flush();
    try {
        TimeUnit.SECONDS.sleep(10);
    } catch (InterruptedException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    disconnect();
}
}

    private void mypass() {
    // TODO Auto-generated method stub
if (sb.toString().endsWith("Password: ")) {
    out.println(password.toString() + "\r\n");
    out.flush();
} else
if (sb.toString().endsWith("password: ")) {
    out.println(password.toString() + "\r\n");
    out.flush();
}
}

    private void mylogin() {
    // TODO Auto-generated method stub
if (sb.toString().endsWith("login: ")) {
    out.println(username.toString() + "\r");
    out.flush();
}
}

      public void disconnect() {
     try {
in.close();
out.close();
telnet.disconnect();

    }
    catch (Exception e) {
    e.printStackTrace();
    }
    }
    }