问为什么TCP客户端无法使用write检测服务器关闭？

EN

try {
    LogUtil.info(TAG, this.label + " tryConnect, attempt = " + (3 - retry));
    clientChannel = SocketChannel.open();
    clientChannel.configureBlocking(true);
    clientChannel.socket().setSoTimeout(100);
    clientChannel.socket().setTrafficClass(0x10);
    clientChannel.socket().setTcpNoDelay(true);
    clientChannel.socket().setPerformancePreferences(3, 3, 1);
    clientChannel.socket().connect(address, 10000);
    LogUtil.info(TAG, this.label + " socket connected successfully");
    break;
} catch (AlreadyConnectedException ace) {
    LogUtil.info(TAG, label + " AlreadyConnectedException");
    break;
} catch (NotYetConnectedException ace) {
    LogUtil.info(TAG, label + " NotYetConnectedException");
    break;
} catch (SocketTimeoutException e) {
    LogUtil.info(TAG, label + " SocketTimeoutException");
    break;
} catch (Exception e) {
    clientChannel = null;
    throw new SocketConnectionException(label + ", exception = " + ThrowableUtil.stackTraceToString(e));
}

public void writeXML(ByteBuffer buffer, int retry) {
        synchronized (writeLock) {
            if (retry < 0) {
                throw new SocketConnectionException(label + "Write Exception");
            }
            tryConnect(false);
            try {
                int written = 0;
                while (buffer.hasRemaining()) {
                    // I think it should be an exception here after I closed server
                    written += clientChannel.write(buffer);
                }
                if (LogUtil.debug) {
                    LogUtil.info(TAG, "\t successfully written = " + written);
                }
            } catch (Exception e) {
                e.printStackTrace();
                tryConnect(true);
                writeXML(buffer, --retry);
            }
        }
    }