一个超简单的telnet客户端，为什么连不上？

[inssuc]

import java.net.*;
import java.io.*;

public class TelnetClient{
public static void main(String args[])throws Exception{
Socket socket=new Socket("127.0.0.1",23);
InputStream is=socket.getInputStream();
OutputStream os=socket.getOutputStream();
DataInputStream dis=new DataInputStream(is);
PrintStream ps=new PrintStream(os);
DataInputStream in=new DataInputStream(System.in);
while(true){
ps.println(in.readLine());
System.out.println(dis.readLine());
}
}
}

哪里出问题了？

[flyxxxxx]

你本机有没有开23端口的服务器啊？

[inssuc]

开了啊

[gxdragon]

我试了你的代码，没问题啊！我用jdk1.4.2编译的

[zhmain]

没有问题，对的

[ynsfsw]

要把输入和输出的线和分开！！

[ynsfsw]

要把输入和输出的线程分开！！

[qazxsw1982103]

编译没错误
不过你的服务器应用程序应该用1024以上的端口
因为1024以下的端口一般为知名的网络服务或系统服务所用

另外，DataInputStream的readLine()方法sun不推荐使用

[inssuc]

谢谢大家！

对了，好像我没有说清楚，我是想做一个telnet的客户端，执行起来就好像在dos窗口下的命令行一样，但是我没有得到这样的效果，请问问题出在什么地方？如何解决？谢谢了！

[ynsfsw]

要达到你说的那个效果问题多多！！

[qazxsw1982103]

刚做的一个，实现聊天
服务器端程序：
import java.io.*;
import java.net.*;

class TcpSever
{
private static ServerSocket server=null;

public static void main(String[] agrs)
{
try
{
server=new ServerSocket(3000);

while(true)
{
Socket s=server.accept();

(new Thread(new DialogToClient(s))).start();
}
}
catch(Exception e)
{
e.printStackTrace();

}
}
}

class DialogToClient implements Runnable
{
private Socket DialogSocket=null;

public DialogToClient(Socket DialogSocket)
{
this.DialogSocket=DialogSocket;
}

public void run()
{
try
{
//System.out.println("in DialogToClient");
InputStream input=DialogSocket.getInputStream();
OutputStream output=DialogSocket.getOutputStream();
(new Thread(new InputData(input))).start();
(new Thread(new OutputData(output))).start();
}
catch(Exception e)
{

}
}
}

class OutputData implements Runnable
{
private BufferedReader read=null;

private OutputStream output=null;

public OutputData(OutputStream output)
{
read=new BufferedReader(new InputStreamReader(System.in));

this.output=output;
}

public void run()
{
while(true)
{
if(Flag.f.getFlag()==false)
break;

try
{
output.write(((read.readLine())+System.getProperty("line.separator")).getBytes());

}
catch(Exception e)
{
}

}

try
{
read.close();
output.close();
}
catch(Exception e)
{
}
}
}

class InputData implements Runnable
{
private BufferedReader input=null;

public InputData(InputStream input)
{
this.input=new BufferedReader(new InputStreamReader(input));

}

public void run()
{
while(true)
{
byte[] b=new byte[2000];

try
{
String str=input.readLine();

if(str.equals("end"))
break;

System.out.println("client: "+str);
}
catch(Exception e)
{

}
}

Flag.f.setFlag(false);

try
{
input.close();
}
catch(Exception e)
{

}

}

}

class Flag
{
private boolean flag=true;

public void setFlag(boolean flag)
{
this.flag=flag;
}

public boolean getFlag()
{
return flag;
}

private Flag()
{

}

public static Flag f=new Flag();
}

客户端程序：
import java.net.*;
import java.io.*;

class TcpClient
{
private BufferedReader read=null;
private OutputStream output=null;

public TcpClient(Socket client)
{
try
{
read=new BufferedReader(new InputStreamReader(System.in));
output=client.getOutputStream();
}
catch(Exception e)
{
System.out.println("error in TcpClient constractor");
}
}
public void writeData()
{
while(true)
{
try
{
String str=read.readLine();
output.write((str+System.getProperty("line.separator")).getBytes());

if(str.equals("end"))
break;
}
catch(Exception e)
{
System.out.println("error in writeData");
}
}

release();
}

public void release()
{
try
{
read.close();
output.close();
}
catch(Exception e)
{
System.out.println("error in release");
}
}

public static void main(String[] agrs)
{
try
{
Socket client=new Socket(InetAddress.getByName("192.168.1.8"),3000);



Thread t=new Thread(new DialogToServer_ReadData(client));

t.setDaemon(true);
t.start();

TcpClient x=new TcpClient(client);

x.writeData();

client.close();
}
catch(Exception e)
{
System.out.println("error in main");
}


}
}

class DialogToServer_ReadData implements Runnable
{
private BufferedReader input=null;

public DialogToServer_ReadData(Socket client)
{
try
{
input=new BufferedReader(new InputStreamReader(client.getInputStream()));
}
catch(Exception e)
{
System.out.println("error in DialogToServer_ReadData constractor");
}
}
public void run()
{
while(true)
{
try
{
System.out.println("server: "+input.readLine());
}
catch(Exception e)
{
System.out.println("error in run");
}
}
}
}


可在同一机器上运行，要先运行服务器程序
关闭时，应先关闭客户机程序

[qazxsw1982103]

别忘了把IP地址改成你自己的

[inssuc]

谢谢大家，可是我的目的是想实现与标准的telnet服务器进行通信，可能要遵守telnet协议吧，但是我不知道如何来做，谁有简单的telnet客户端程序，请贴出来好吗？谢谢！