java - 即使我关闭套接字也会出现 java.net.BindException

Question

我是套接字编程的新手，只是尝试编写一个小程序来了解套接字的工作原理。有一个客户端和一个服务器，我只是尝试从服务器加载一些字符串并显示。但是每次我创建一个服务器套接字时，即使我手动清理了finally block 中的所有资源，我也会得到java.net.BindException。看一下下面的代码，并请建议对可能导致此问题的原因进行一些编辑。我正在使用 Eclipse。

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;

public class AdviceServer {

String[] adviceList = {
        "Take smaller bites",
        "Go for the tight jeans. No they do NOT" + "make you look fat.",
        "One word: inappropriate",
        "Just for today, be honest. Tell your"
                + "boss what you *really* think",
        "You might want to rethink that haircut." };

public void setUpServer() {

    ServerSocket serverSocket = null;

    try {
        if (serverSocket == null)
        serverSocket = new ServerSocket(8003);
        int i = 2;

        // Keep looping till we have clients.
        while (true) {
            Socket sock = serverSocket.accept();
            PrintWriter pw = new PrintWriter(sock.getOutputStream());
            pw.write(getRandomAdvice());
            pw.close();
            System.out.println(getRandomAdvice());
        }

     //   serverSocket.close();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } finally {
        if (serverSocket != null) {
            try {
                serverSocket.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
}

public void setUpClient() {

    // Make a socket
    Socket chatSocket = null;
    try {
        chatSocket = new Socket("127.0.0.1", 8003);
        InputStreamReader isr = new InputStreamReader(
                chatSocket.getInputStream());

        // Make a chain stream Buffered Reader
        BufferedReader br = new BufferedReader(isr);

        String text;
        while ((text = br.readLine()) != null) {
            System.out.println(text);
        }

        br.close();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } finally {
        if (chatSocket != null) {
            try {
                chatSocket.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }


}

public String getRandomAdvice() {
    return adviceList[(int) (Math.random() * adviceList.length)];

}

public static void main(String[] args) {
    AdviceServer as = new AdviceServer();

    as.setUpClient();
    as.setUpServer();
}
}

任何帮助将不胜感激，因为我已经尝试了几乎所有方法来纠正这个问题。

Answer 1

您必须运行代码两次，因此会收到 BindException。与第一次运行一样，服务器将在端口 8003 上运行并监听，您将收到 ConnectionRefused错误。下次运行此程序时，当您再次运行服务器代码时，客户端将从服务器获取消息，然后是 BindException。

问题是服务器和客户端运行在同一个主线程上。尝试在不同的线程中运行服务器。并且首先运行服务器，它会监听客户端的连接。