java - InputStreamReader 的 readln 不起作用

Question

我必须使用java与服务器发送和接收一些流。协议(protocol)是 telnet，如果我在 Windows 中使用 cmd 并执行以下命令:"telnet 10.0.1.5 9100" 并在 "^AI202" 之后，我会收到响应。

代码java:

import java.io.*;

import java.net.*;

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

    Socket s = new Socket();

    PrintWriter s_out = null;

    BufferedReader s_in = null;

    String remoteip = "10.0.1.5";

    int remoteport = 9100;

    s.connect(new InetSocketAddress(remoteip , remoteport));

    s_out = new PrintWriter( s.getOutputStream(), true);

    s_in = new BufferedReader(new InputStreamReader(s.getInputStream()));

    String message = "^AI202";

    try{

    System.out.println(s_in.readLine());

    }

    catch(Error e){

    System.out.println(e);

    }

    s_out.close();

    s_in.close();

    s.close();

}

问题是相同的:s_in调用方法readLine()并且程序无限循环。

Answer 1

我认为 System.out.println(s_in.readLine());会尝试一遍又一遍地读取它，每次都会失败并导致无限循环。

尝试

 String line ="";

 while ((line = s_in.readLine()) != null) { 

      // Do what you want to do with line.          

}

Java Socket BufferReader.readline get null