Question

我正在尝试在地址“localhost”上的端口25565上的套接字上发送ByteBuffer数组。但由于某种原因，Java在执行input.read()时会抛出连接重置异常。有人可以告诉我发生了什么事吗？

发信人：

private static Socket socket;

public static void main(String[] args) throws IOException {
    socket = new Socket("localhost", 25565);
    String Password = "1234";
    ByteBuffer Buffer = ByteBuffer.allocate(1 + Password.getBytes().length);
    Buffer.put((byte) 0x00);
    Buffer.putShort((short) Password.getBytes().length);
    Buffer.put(Password.getBytes());
    DataOutputStream output = new DataOutputStream(socket.getOutputStream());
    output.write(Buffer.array());
}

public static void sendBytes(byte[] myByteArray) throws IOException {
    DataOutputStream output = new DataOutputStream(socket.getOutputStream());
    output.write("LOL".getBytes());
    output.flush();
}

接收器：

public static void main(String[] args) {
    try {
        ServerSocket ServerSocket = new ServerSocket(25565);
        System.out.println("Waiting for connection...");
        Socket socket = ServerSocket.accept();
        DataInputStream Input = new DataInputStream(new BufferedInputStream(socket.getInputStream()));
        System.out.println(Input.read());
        ServerSocket.close();
        socket.close();
    } catch (Exception e) {
        if(e instanceof SocketTimeoutException) {
            System.out.println("THE SOCKET TIMED OUT!");
        }
        else {
            e.printStackTrace();
        }
    }
}

堆栈追踪：

java.net.SocketException: Connection reset
at java.net.SocketInputStream.read(SocketInputStream.java:189)
at java.net.SocketInputStream.read(SocketInputStream.java:121)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:246)
at java.io.BufferedInputStream.read(BufferedInputStream.java:265)
at java.io.FilterInputStream.read(FilterInputStream.java:83)
at net.networking.Receiver.main(Receiver.java:17)

注意：是的，我知道仅使用input.read()将无法获取我正在尝试发送的整个ByteBuffer数组。但是现在我只想读取第一个字节并将其打印到控制台。

Answer 1

您未关闭发件人中的连接，因此会在流程退出时重置。

private static Socket socket;

public static void main(String[] args) throws IOException {
    socket = new Socket("localhost", 25565);
    String Password = "1234";
    sendBytes(Password.getBytes());
    output.close();
}

public static void sendBytes(byte[] myByteArray) throws IOException {
    ByteBuffer Buffer = ByteBuffer.allocate(3 + myByteArray.length);
    Buffer.put((byte) 0x00);
    Buffer.putShort((short) myByteArray.length);
    Buffer.put(myByteArray);
    DataOutputStream output = new DataOutputStream(socket.getOutputStream());
    output.write(Buffer.array());
    output.flush();
}

您只需读取一个字节然后关闭连接。您需要阅读整个传输。如果关闭仍未处理的未读数据的套接字，则重置连接。此外，如果您想单独处理异常，请分别捕获它们。请勿使用instanceof。

public static void main(String[] args) {
    try {
        ServerSocket ServerSocket = new ServerSocket(25565);
        System.out.println("Waiting for connection...");
        Socket socket = ServerSocket.accept();
        DataInputStream Input = new DataInputStream(new BufferedInputStream(socket.getInputStream()));
        byte b = Input.readByte();
        short dataLen = Input.readShort();
        byte[] data = new byte[dataLen];
        Input.readFully(data);
        // use data as needed...
        System.out.println("Data received");
        Input.close();
        ServerSocket.close();
    } catch (SocketTimeoutException e) {
        System.out.println("THE SOCKET TIMED OUT!");
    } catch (Exception e) {
        e.printStackTrace();
    }
}

套接字重置异常 - Java

1 个答案: