Question

我正在制作一个java telnet服务器。客户端是Windows telnet。我坚持发送数据，用其他键而不是＆＃34; ENTER＆＃34;键。例如：您好，我是用户1。在＆＃34;用户1＆＃34;之后当输入句号时，应该发送它代码：

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Answer 1

我认为问题在于你的代码。这段代码永远不会有效。

byte[] buff = new byte[4096];
String str = new String(buff, "UTF-8"); //the buffer is initialized to 0 so we get no String
do {
    if ( buff[0] == 46 ) {  //46-[.]
        System.out.println("46-[.]  " + buff[0]);
        //incoming.getInputStream().read(buff);
    }
    incoming.getInputStream().read(buff);   //reading into an array
} while ((buff[0] != 27) && (!done));       //and only checking first index

试试这个，看它是否有效。

public static void main(String[] args) throws IOException {
    //listen on tcp port 5000
    ServerSocket ss = new ServerSocket(5000);
    Socket s = ss.accept();

    //create an input/output stream
    InputStream in = new BufferedInputStream(s.getInputStream());
    PrintWriter out = new PrintWriter(s.getOutputStream(), true);

    byte[] buffer = new byte[0x2000];
    for (int bufferlen = 0, val; (val = in.read()) != -1;) {
        if (val == '.') { //if token is a '.' no magic numbers such as 46
            String recv = new String(buffer, 0, bufferlen);
            System.out.printf("Received: \"%s\"%n", recv);
            bufferlen = 0; //reset this to 0
        } else if (val == 27) {
            s.close();
            break;
        } else { //character is not a . so add it to our buffer
            buffer[bufferlen++] = (byte)val;
        }
    }
    System.out.println("Finished");
}

运行时从同一台计算机执行telnet localhost 5000。每次按一个键都会发送Windows telnet，所以这将适用于windows telnet而不是linux。您必须记住TCP是基于流的，而不像基于数据包的UDP。我已经使用Windows命令提示符测试了这个，所以如果它不起作用，我就不知道你正在使用哪一个。

Java telnet服务器发送数据，字符串与其他键而不是＆＃34; ENTER＆＃34;

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