java无法使用socket从服务器接收数据。recv()
我有一个python客户端,它以json格式向java服务器发送一些数据(名称空间、度量单位名称、时间戳、度量单位值、维度),并接收响应
以下是客户端代码的一部分:
def _init_socket(self):
logger.info("initial socket, hostname {}, port {}".format(self.host, self.port))
client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
address = (self.host, self.port)
client.connect(address)
self.client = client
def send_put_metrics_request(self, namespace, metric_name, metric_value, dimensions):
try:
self._init_socket()
timestamp = int(round(time.time() * 1000))
send_data = self.convert_to_json(namespace, metric_name, timestamp, metric_value, dimensions)
self.client.send(bytes(send_data + "\n", encoding=self.encoding))
self.client.shutdown(socket.SHUT_WR)
data = self.client.recv(1024)
print(data)
finally:
self.client.close()
在服务器端,我只想将HelloWorld返回给客户端。以下是java服务器代码的一部分:
public void start() {
logger.info("Daemon Server is listening for metrics");
try (final ServerSocket serverSocket = new ServerSocket()) {
final int port = 7072;
serverSocket.bind(new InetSocketAddress(port));
while (true) {
final Socket socket = serverSocket.accept();
threadPool.submit(() -> process(socket));
}
} catch (final Exception e) {
logger.error(Thread.currentThread().getId() + " failed to make a connection to the server socket"
+ e.getMessage());
throw new ConnectToServerSocketException(Thread.currentThread().getId()
+ " failed to make a connection to the server socket" + e.getMessage());
} finally {
threadPool.shutdown();
}
}
protected void process(final Socket socket) {
final Message message;
try (final InputStream input = socket.getInputStream()) {
final OutputStream output = socket.getOutputStream();
final OutputStreamWriter osw = new OutputStreamWriter(output, "UTF8");
final PrintWriter writer = new PrintWriter(new BufferedWriter(osw));
message = objectMapper.readValue(inputStreamToString(input), Message.class);
// pls ignore the below line, it just calls another method to do something
final String res = forwardMetrics(message);
logger.info("Thread " + Thread.currentThread().getId() + " processed result: " + res);
writer.println("HelloWorld"+"\n");
writer.flush();
socket.close();
logger.info("Socket closed")
} catch (final IOException e) {
logger.error(e.getMessage());
logger.error("Daemon server failed to read input from socket");
throw new ReadFromSocketException("Failed to read input from socket", e);
}
}
然后在我启动服务器并通过客户端以正确的格式发送请求之后。我没有从客户端获得“HelloWorld”。打印结果只是b'。从服务器端的日志中,它执行所有行,直到socket关闭
我想知道为什么没有打印出来
# 1 楼答案
不能保证客户机中的
socket.recv()
在第一次获取时返回响应。我建议您在while循环中调用recv()
,直到它收到None