Java ServerSocket未出现在Netstat中？

非常困惑，我刚刚发布了这个问题，但删除了它，因为我犯了很多错误。好吧，又来了！下面我有一个java服务器程序。当我运行它时，我希望在netstat中看到某种存在，但我什么也看不到。以下是一些屏幕截图：

在运行服务器之前：

在右上角的终端上运行server server之后，右下角是client，明显地左边是netstat：

有点长，但这是我使用63400运行的服务器：

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

public class JavaTest2 {
    public static void main(String[] args) throws IOException {

        if (args.length != 1) {
            System.err.println("Usage: java KnockKnockServer <port number>");
            System.exit(1);
        }

        int portNumber = Integer.parseInt(args[0]);

        try (
                ServerSocket serverSocket = new ServerSocket(portNumber);
                Socket clientSocket = serverSocket.accept();
                PrintWriter out =
                        new PrintWriter(clientSocket.getOutputStream(), true);
                BufferedReader in = new BufferedReader(
                        new InputStreamReader(clientSocket.getInputStream()));
        ) {

            String inputLine, outputLine;

            // Initiate conversation with client
            KnockKnockProtocol kkp = new KnockKnockProtocol();
            outputLine = kkp.processInput(null);
            out.println(outputLine);

            while ((inputLine = in.readLine()) != null) {
                outputLine = kkp.processInput(inputLine);
                out.println(outputLine);
                if (outputLine.equals("Bye."))
                    break;
            }
        } catch (IOException e) {
            System.out.println("Exception caught when trying to listen on port "
                    + portNumber + " or listening for a connection");
            System.out.println(e.getMessage());
        }
    }
}

class KnockKnockProtocol {
    private static final int WAITING = 0;
    private static final int SENTKNOCKKNOCK = 1;
    private static final int SENTCLUE = 2;
    private static final int ANOTHER = 3;

    private static final int NUMJOKES = 5;

    private int state = WAITING;
    private int currentJoke = 0;

    private String[] clues = { "Turnip", "Little Old Lady", "Atch", "Who", "Who" };
    private String[] answers = { "Turnip the heat, it's cold in here!",
            "I didn't know you could yodel!",
            "Bless you!",
            "Is there an owl in here?",
            "Is there an echo in here?" };

    public String processInput(String theInput) {
        String theOutput = null;

        if (state == WAITING) {
            theOutput = "Knock! Knock!";
            state = SENTKNOCKKNOCK;
        } else if (state == SENTKNOCKKNOCK) {
            if (theInput.equalsIgnoreCase("Who's there?")) {
                theOutput = clues[currentJoke];
                state = SENTCLUE;
            } else {
                theOutput = "You're supposed to say \"Who's there?\"! " +
                        "Try again. Knock! Knock!";
            }
        } else if (state == SENTCLUE) {
            if (theInput.equalsIgnoreCase(clues[currentJoke] + " who?")) {
                theOutput = answers[currentJoke] + " Want another? (y/n)";
                state = ANOTHER;
            } else {
                theOutput = "You're supposed to say \"" +
                        clues[currentJoke] +
                        " who?\"" +
                        "! Try again. Knock! Knock!";
                state = SENTKNOCKKNOCK;
            }
        } else if (state == ANOTHER) {
            if (theInput.equalsIgnoreCase("y")) {
                theOutput = "Knock! Knock!";
                if (currentJoke == (NUMJOKES - 1))
                    currentJoke = 0;
                else
                    currentJoke++;
                state = SENTKNOCKKNOCK;
            } else {
                theOutput = "Bye.";
                state = WAITING;
            }
        }
        return theOutput;
    }
}

现在，当我运行客户机时，我可以看到netstat在最顶端的状态，两个套接字作为我的服务器和客户机在同一台计算机上运行。但仍然没有服务器套接字：

截图：

使用127.0.0.1 64300运行的客户端代码：

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

public class JavaTest {
    public static void main(String[] args) throws IOException {

        if (args.length != 2) {
            System.err.println(
                    "Usage: java KnockKnockClient <host name> <port number>");
            System.exit(1);
        }

        String hostName = args[0];
        int portNumber = Integer.parseInt(args[1]);

        try (
                Socket kkSocket = new Socket(hostName, portNumber);
                PrintWriter out = new PrintWriter(kkSocket.getOutputStream(), true);
                BufferedReader in = new BufferedReader(
                        new InputStreamReader(kkSocket.getInputStream()));
        ) {
            BufferedReader stdIn =
                    new BufferedReader(new InputStreamReader(System.in));
            String fromServer;
            String fromUser;

            while ((fromServer = in.readLine()) != null) {
                System.out.println("Server: " + fromServer);
                if (fromServer.equals("Bye."))
                    break;

                fromUser = stdIn.readLine();
                if (fromUser != null) {
                    System.out.println("Client: " + fromUser);
                    out.println(fromUser);
                }
            }
        } catch (UnknownHostException e) {
            System.err.println("Don't know about host " + hostName);
            System.exit(1);
        } catch (IOException e) {
            System.err.println("Couldn't get I/O for the connection to " +
                    hostName);
            System.exit(1);
        }
    }
}

提前感谢所有花时间来解决这个问题的人

我想它可能只是netstat，但我仍然想知道为什么我运行lsof-I:64300时会这样 它显示了我的java进程，当时只有服务器在运行。当我运行它的时候，我看到了3，你可以在这个屏幕截图的左边终端看到。在netstat显示我认为相关的内容之后，我取消了它，因为我无法解释其余的内容。我不知道它是否在那里。希望有人能帮忙

好的，我只是在写这篇文章的时候发现了更多，因为我不能在90分钟内发表文章，但是现在当我使用intellij idea并在那里运行它时。只有服务器，没有变化，但是当我添加客户端时，我看到了一切

在任何事情之前：

服务器：

客户端+服务器：

---

发生了什么事。。。。我还看到6个本地主机，而不是3个。。。天哪，这很有趣，否则我只是犯了一个愚蠢的错误。但是我开始怀疑这些问题。

netstat默认情况下会忽略监听套接字。所有插座都有-l选项或-all选项默认情况下，laune

netstat忽略侦听套接字。有一个-l选项或-all for all套接字。我不是netstat专家，但我注意到您的netstat列表的标题是Active Internet connections。可能只是在侦听的服务器还没有激活？看起来我在一个服务器中就找到了它。第一条评论指出了另一种解决方案：确保您阅读了有关您使用的工具的文档，以便了解它们的实际工作方式。请确保您是正确的。当我运行它时，除了netstat-l，我没有看到它。感谢您没有将服务器套接字绑定到特定的IP地址，因此它显示为“*”。同样，netstat文档中几乎肯定提到了这一点。