Java多客户端服务器套接字获取错误

我试着让一个简单的服务器接受多个套接字&然后让它们输入并接收输出

但我似乎做错了，因为我犯了很多错误。 我是不是想这么做？我怎样才能做得更好

我不明白为什么会出现这些错误：

Starting up..
Trying to listen...
Server is successfully running on port 43594
New connection: /127.0.0.1:60639
java.net.SocketException: Connection reset
    at java.net.SocketInputStream.read(Unknown Source)
    at java.net.SocketInputStream.read(Unknown Source)
    at sun.nio.cs.StreamDecoder.readBytes(Unknown Source)
    at sun.nio.cs.StreamDecoder.implRead(Unknown Source)
    at sun.nio.cs.StreamDecoder.read(Unknown Source)
    at java.io.InputStreamReader.read(Unknown Source)
    at java.io.BufferedReader.fill(Unknown Source)
    at java.io.BufferedReader.readLine(Unknown Source)
    at java.io.BufferedReader.readLine(Unknown Source)
    at Client.getInputStream(Client.java:29)
    at ClientHandler.run(ClientHandler.java:19)
java.net.SocketException: Connection reset
    at java.net.SocketInputStream.read(Unknown Source)
    at java.net.SocketInputStream.read(Unknown Source)
    at sun.nio.cs.StreamDecoder.readBytes(Unknown Source)
    at sun.nio.cs.StreamDecoder.implRead(Unknown Source)
    at sun.nio.cs.StreamDecoder.read(Unknown Source)
    at java.io.InputStreamReader.read(Unknown Source)
    at java.io.BufferedReader.fill(Unknown Source)
    at java.io.BufferedReader.readLine(Unknown Source)
    at java.io.BufferedReader.readLine(Unknown Source)
    at Client.getInputStream(Client.java:29)
    at ClientHandler.run(ClientHandler.java:19)
java.net.SocketException: Connection reset
    at java.net.SocketInputStream.read(Unknown Source)
    at java.net.SocketInputStream.read(Unknown Source)
    at sun.nio.cs.StreamDecoder.readBytes(Unknown Source)
    at sun.nio.cs.StreamDecoder.implRead(Unknown Source)
    at sun.nio.cs.StreamDecoder.read(Unknown Source)
    at java.io.InputStreamReader.read(Unknown Source)
    at java.io.BufferedReader.fill(Unknown Source)
    at java.io.BufferedReader.readLine(Unknown Source)
    at java.io.BufferedReader.readLine(Unknown Source)
    at Client.getInputStream(Client.java:29)
    at ClientHandler.run(ClientHandler.java:19)
java.net.SocketException: Connection reset
    at java.net.SocketInputStream.read(Unknown Source)
    at java.net.SocketInputStream.read(Unknown Source)
    at sun.nio.cs.StreamDecoder.readBytes(Unknown Source)
    at sun.nio.cs.StreamDecoder.implRead(Unknown Source)
    at sun.nio.cs.StreamDecoder.read(Unknown Source)
    at java.io.InputStreamReader.read(Unknown Source)
    at java.io.BufferedReader.fill(Unknown Source)
    at java.io.BufferedReader.readLine(Unknown Source)
    at java.io.BufferedReader.readLine(Unknown Source)
    at Client.getInputStream(Client.java:29)
    at ClientHandler.run(ClientHandler.java:19)
java.net.SocketException: Connection reset
    at java.net.SocketInputStream.read(Unknown Source)
    at java.net.SocketInputStream.read(Unknown Source)
    at sun.nio.cs.StreamDecoder.readBytes(Unknown Source)
    at sun.nio.cs.StreamDecoder.implRead(Unknown Source)
    at sun.nio.cs.StreamDecoder.read(Unknown Source)
    at java.io.InputStreamReader.read(Unknown Source)
    at java.io.BufferedReader.fill(Unknown Source)
    at java.io.BufferedReader.readLine(Unknown Source)
    at java.io.BufferedReader.readLine(Unknown Source)
    at Client.getInputStream(Client.java:29)
    at ClientHandler.run(ClientHandler.java:19)
java.net.SocketException: Connection reset
    at java.net.SocketInputStream.read(Unknown Source)
    at java.net.SocketInputStream.read(Unknown Source)
    at sun.nio.cs.StreamDecoder.readBytes(Unknown Source)
    at sun.nio.cs.StreamDecoder.implRead(Unknown Source)
    at sun.nio.cs.StreamDecoder.read(Unknown Source)
    at java.io.InputStreamReader.read(Unknown Source)
    at java.io.BufferedReader.fill(Unknown Source)
    at java.io.BufferedReader.readLine(Unknown Source)
    at java.io.BufferedReader.readLine(Unknown Source)
    at Client.getInputStream(Client.java:29)
    at ClientHandler.run(ClientHandler.java:19)

还有更多的错误。它基本上是一次又一次地循环相同的错误，但是为什么呢

我已经对代码进行了注释，这样您就可以看到我试图做的事情，也许可以修改我的做法

public class Server {

    private int port = 43594;

    public void listen() {
        System.out.println("Trying to listen...");
        try {
            final ServerSocket server = new ServerSocket(port);
            // Create new thread to handle clients I/O
            ClientHandler handler = new ClientHandler(server);
            // START it
            handler.start();
            System.out.println("Server is successfully running on port " + port);
            while (true) {
                // New connection found create a new Client object
                Client cl = new Client(server.accept());
                cl.setup();
                // add it to clietns list in the I/O handler
                handler.clients.add(cl);
            }           
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

    public static void main(String[] args) {
        // start up
        System.out.println("Starting up..");

        // server instance
        final Server server = new Server();

        // create a new thread for server
        new Thread(new Runnable() {
            @Override
            public void run() {
                // listen for new connections
                server.listen();
            }
        }).start();
    }
}

public class ClientHandler extends Thread {

    private Thread handler;
    public ArrayList<Client> clients = new ArrayList<Client>(); // client list
    private ServerSocket server;

    public ClientHandler(ServerSocket s) {
        server = s;
    }

    public void run() {

        while(true) {
            // Loop every time through every client and see if he has wrote
            // anything to do server. I am 100% sure this is wrong, how can I do this
            // without using multithreads (thread per client)?
            for (Client c : this.clients) {
                if (c.getInputStream() != null) {
                    // found input, return a message.
                    c.sendMessage("hey client");
                }
            }
            try {
                // sleep for 100ms
                Thread.sleep(100);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}

public class Client {

    private Socket socket;
    private int clientId;
    private BufferedReader inStream;
    private PrintWriter outStream;
    private boolean socketAlive = true;

    public Client(Socket sock) {
        this.socket = sock;
    }

    public void setup() {
        setInputOutputStream();
        System.out.println("New connection: " + this.getIpAddress());
        this.sendMessage("Successfully connected!");
    }


    public String getInputStream() {
        String toReturn = "";
        try {
            toReturn = this.inStream.readLine();
        } catch (IOException e) {
            e.printStackTrace();
        }

        return toReturn;
    }

    private void setInputOutputStream() {
        try {
            inStream = new BufferedReader(new InputStreamReader(this.socket.getInputStream())); 
            outStream = new PrintWriter(this.socket.getOutputStream());
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void sendMessage(String s) {
        this.outStream.println(s);
        this.outStream.flush();
    }

    public String getIpAddress() {
        return this.socket.getRemoteSocketAddress().toString();
    }
}

---

为什么连接一直被重置？

客户端没有循环或延迟，因此它会在发送数据后立即退出。当程序退出时，操作系统总是关闭其所有网络连接

---

另外，我认为这并不是您想要它做的：

System.out.println（reader.toString（））。检查客户端的输出
 您正在从服务器写入您在客户端没有读取的内容。相反，客户端只是在打印后退出。”toString（）不执行任何I/O操作。您需要调用read方法

public class TestClient {

    /**
     * @param args
     * @throws IOException 
     * @throws UnknownHostException 
     */
    public static void main(String[] args) {
        try {
            System.out.println("Client started");
            Socket sock = new Socket("localhost", 43594);
            Scanner scanner = new Scanner(System.in);
            String input;
            PrintWriter out = new PrintWriter(sock.getOutputStream());
            BufferedReader reader = new BufferedReader(new InputStreamReader(sock.getInputStream()));

            input = scanner.nextLine();

            if (input != null) {
                out.print(input);
            }
            if (reader.toString() != null) {
                System.out.println(reader.toString());
            }
        } catch (IOException e) {
            System.out.println("Client error");
        }

    }

}