Question

我正在尝试编写一个简单的代理服务器，我发现这个代码在线，我只想尝试运行它看看它是否有效，但是当它创建一个新套接字时，它得到一个ConnectException，表示Connect被拒绝。我正在使用'localhost'作为主机，我尝试了几个不同的端口，但没有任何作用。这里有什么问题，是代码还是我的机器？

public static void runServer(String host, int remotePort, int localPort) throws IOException {

    // Create the socket for listening connections
    ServerSocket mySocket = new ServerSocket(localPort);

    final byte[] request = new byte[1024];
    byte[] reply = new byte[4096];

    while (true) {
        Socket client = null, server = null;

        try {
            client = mySocket.accept();

            final InputStream streamFromClient = client.getInputStream();
            final OutputStream streamToClient = client.getOutputStream();

            try {
                server = new Socket(host, remotePort);
            } catch (IOException e) {
                PrintWriter out = new PrintWriter(streamToClient);
                out.print("Proxy server cannot connect to " + host + ":"
                + remotePort + ":\n" + e + "\n");
                out.flush();
                client.close();
                continue;
            }

            final InputStream streamFromServer = server.getInputStream();
            final OutputStream streamToServer = server.getOutputStream();

            Thread t = new Thread() {
                public void run() {
                    int bytesRead;
                    try {
                        while ((bytesRead = streamFromClient.read(request)) != -1) {
                            streamToServer.write(request, 0, bytesRead);
                            streamToServer.flush();
                        }
                    } catch (IOException e) {
                    }
                }
            };

            t.start();

            int bytesRead;
            try {
                while ((bytesRead = streamFromServer.read(reply)) != -1) {
                    streamToClient.write(reply, 0, bytesRead);
                    streamToClient.flush();
                }
            } catch (IOException e) {
            }
            streamToClient.close();

        } catch (IOException e) {
            System.err.println(e);
        } finally {
            try {
                if (server != null)
                    server.close();
                if (client != null)
                    client.close();
            } catch (IOException e) {
            }
        }
    }

Answer 1

'拒绝连接'意味着一件事：没有人在IP：你试图连接的端口。所以这是错的。解决方案是使其正确，或者启动服务器（如果尚未启动）。

Answer 2

您需要在从套接字读取数据时设置超时，有一个示例here

Java新套接字连接被拒绝

2 个答案: