java socket编程怎样处理粘包问题

?Java Socket???,?????????TCP???????????????????????????,?????????????????,???????????????,??????????:

1. ???????:??????,????????????,???????????????????????????,???????,?????????

// ?????
public void sendPacket(String data, Socket socket) throws IOException {
    // ????
    int length = data.length();
    String header = String.format("d", length);
    socket.getOutputStream().write(header.getBytes());
    socket.getOutputStream().write(data.getBytes());
    socket.getOutputStream().flush();
}

// ?????
public String receivePacket(Socket socket) throws IOException {
    // ????
    InputStream inputStream = socket.getInputStream();
    byte[] headerBytes = new byte[4];
    inputStream.read(headerBytes);
    String header = new String(headerBytes);
    int length = Integer.parseInt(header);

    // ????
    byte[] dataBytes = new byte[length];
    inputStream.read(dataBytes);
    return new String(dataBytes);
}

2. ???????:?????????????,?????????????????????????????,????????????????????????????????????

// ?????
public String receivePacket(Socket socket) throws IOException {
    InputStream inputStream = socket.getInputStream();
    byte[] buffer = new byte[MAX_PACKET_LENGTH];
    int bytesRead;
    StringBuilder data = https://www.yisu.com/ask/new StringBuilder();>= MAX_PACKET_LENGTH) {
            break;
        }
    }

    return data.toString();
}

3. ????????:??????,??????(????)??????????????????,???????????????

// ?????
public void sendPacket(String data, Socket socket) throws IOException {
    // ??????????
    socket.getOutputStream().write(data.getBytes());
    socket.getOutputStream().write("\n".getBytes());
    socket.getOutputStream().flush();
}

// ?????
public String receivePacket(Socket socket) throws IOException {
    InputStream inputStream = socket.getInputStream();
    StringBuilder data = https://www.yisu.com/ask/new StringBuilder();"\n");
        if (endIndex != -1) {
            String packet = data.substring(0, endIndex);
            data.delete(0, endIndex + 1);
            return packet;
        }
    }

    return data.toString();
}

???????????Java Socket???????????????,????????????????