我构建了一个基于netty websocket client example的websocket客户端与第三方提要集成，代码与官方示例几乎相同，只更改了URI和TextWebSocketFrame处理。
此客户端是Spring Boot网络应用程序的一部分，然而，一旦我将战争部署到Linux服务器（Linux版本2.6.32-504.3），它在我的MacBook或Windows 7 PC上运行良好.3.el6.x86_64 Red Hat 4.4.7-11），当应用程序启动时，通道将直接处于非活动状态。
WebSocketClientHandler.java：
public class WebSocketClientHandler extends SimpleChannelInboundHandler<Object> {
private final Logger logger = LoggerFactory.getLogger("feedlogger");
private final WebSocketClientHandshaker handshaker;
private ChannelPromise handshakeFuture;
public WebSocketClientHandler(WebSocketClientHandshaker handshaker) {
this.handshaker = handshaker;
}
public ChannelFuture handshakeFuture() {
return handshakeFuture;
}
@Override
public void handlerAdded(ChannelHandlerContext ctx) {
handshakeFuture = ctx.newPromise();
}
@Override
public void channelActive(ChannelHandlerContext ctx) {
handshaker.handshake(ctx.channel());
}
@Override
public void channelInactive(ChannelHandlerContext ctx) {
// always reaches here immediately on Linux
logger.error("webSocket Client disconnected!");
}
@Override
public void channelRead0(ChannelHandlerContext ctx, Object msg) throws Exception {
Channel ch = ctx.channel();
if (!handshaker.isHandshakeComplete()) {
handshaker.finishHandshake(ch, (FullHttpResponse) msg);
logger.info("finishHandshake and webSocket Client Connected!");
handshakeFuture.setSuccess();
return;
}
if (msg instanceof FullHttpResponse) {
FullHttpResponse response = (FullHttpResponse) msg;
logger.error("Unexpected FullHttpResponse (getStatus=" + response.status() + ", content="
+ response.content().toString(CharsetUtil.UTF_8) + ')');
return;
}
WebSocketFrame frame = (WebSocketFrame) msg;
if (frame instanceof TextWebSocketFrame) {
TextWebSocketFrame textFrame = (TextWebSocketFrame) frame;
logger.info(textFrame.text());
List<String> messages = FeedJsonUtils.deserializeAsyncMessage(textFrame.text());
if (!CollectionUtils.isEmpty(messages)) {
messages.stream().forEach(message -> {
FeedReceiver.onMessage(message);
});
}
} else if (frame instanceof PongWebSocketFrame) {
logger.error("WebSocket Client received pong");
} else if (frame instanceof CloseWebSocketFrame) {
logger.error("WebSocket Client received closing");
ch.close();
}
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause)
{
logger.error("exception caught: ", cause);
cause.printStackTrace();
if (!handshakeFuture.isDone()) {
handshakeFuture.setFailure(cause);
}
ctx.close();
}
}
WebSocketClientImpl.java：
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.URI;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import io.netty.bootstrap.Bootstrap;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.http.DefaultHttpHeaders;
import io.netty.handler.codec.http.HttpClientCodec;
import io.netty.handler.codec.http.HttpObjectAggregator;
import io.netty.handler.codec.http.websocketx.CloseWebSocketFrame;
import io.netty.handler.codec.http.websocketx.PingWebSocketFrame;
import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;
import io.netty.handler.codec.http.websocketx.WebSocketClientHandshakerFactory;
import io.netty.handler.codec.http.websocketx.WebSocketFrame;
import io.netty.handler.codec.http.websocketx.WebSocketVersion;
import io.netty.handler.codec.http.websocketx.extensions.compression.WebSocketClientCompressionHandler;
import io.netty.handler.ssl.SslContext;
import io.netty.handler.ssl.SslContextBuilder;
import io.netty.handler.ssl.util.InsecureTrustManagerFactory;
@Component
public class WebsocketClientImpl {
private final Logger logger = LoggerFactory.getLogger("feedlogger");
private static final String WSS_URL = "wss://api.xxx.com/ws/?token=";
private Channel ch = null;
@Async
public void connectWebSocket(String token) throws Exception {
URI uri = new URI(WSS_URL + token);
String scheme = uri.getScheme() == null ? "wss" : uri.getScheme();
final String host = uri.getHost() == null ? "api.mollybet.com" : uri.getHost();
final int port;
if (uri.getPort() == -1) {
if ("ws".equalsIgnoreCase(scheme)) {
port = 80;
} else if ("wss".equalsIgnoreCase(scheme)) {
port = 443;
} else {
port = -1;
}
} else {
port = uri.getPort();
}
if (!"ws".equalsIgnoreCase(scheme) && !"wss".equalsIgnoreCase(scheme)) {
logger.error("Only WS(S) is supported.");
return;
}
// SSL handling
final boolean ssl = "wss".equalsIgnoreCase(scheme);
final SslContext sslCtx;
if (ssl) {
sslCtx = SslContextBuilder.forClient().trustManager(InsecureTrustManagerFactory.INSTANCE).build();
} else {
sslCtx = null;
}
EventLoopGroup group = new NioEventLoopGroup();
try {
// Connect with V13 (RFC 6455 aka HyBi-17). You can change it to V08
// or V00.
// If you change it to V00, ping is not supported and remember to
// change
// HttpResponseDecoder to WebSocketHttpResponseDecoder in the
// pipeline.
final WebSocketClientHandler handler = new WebSocketClientHandler(WebSocketClientHandshakerFactory
.newHandshaker(uri, WebSocketVersion.V13, null, true, new DefaultHttpHeaders()));
Bootstrap b = new Bootstrap();
b.group(group).channel(NioSocketChannel.class).handler(new ChannelInitializer<SocketChannel>() {
@Override
protected void initChannel(SocketChannel ch) {
ChannelPipeline p = ch.pipeline();
if (sslCtx != null) {
p.addLast(sslCtx.newHandler(ch.alloc(), host, port));
}
p.addLast(new HttpClientCodec(), new HttpObjectAggregator(8192),
WebSocketClientCompressionHandler.INSTANCE, handler);
}
});
ch = b.connect(uri.getHost(), port).sync().channel();
handler.handshakeFuture().sync();
BufferedReader console = new BufferedReader(new InputStreamReader(System.in));
while (true) {
String msg = console.readLine();
if (msg == null) {
break;
} else if ("bye".equals(msg.toLowerCase())) {
ch.writeAndFlush(new CloseWebSocketFrame());
ch.closeFuture().sync();
break;
} else if ("ping".equals(msg.toLowerCase())) {
WebSocketFrame frame = new PingWebSocketFrame(Unpooled.wrappedBuffer(new byte[] { 8, 1, 8, 1 }));
ch.writeAndFlush(frame);
} else {
WebSocketFrame frame = new TextWebSocketFrame(msg);
ch.writeAndFlush(frame);
}
}
} finally {
group.shutdownGracefully();
}
}
public void send(String message) {
if (ch == null) {
logger.error("channel unavailable");
return;
}
WebSocketFrame frame = new TextWebSocketFrame(message);
ch.writeAndFlush(frame);
}
}
FeedServiceImpl.java :(在应用程序启动时自动连接websocket）
@Service
@PropertySource("classpath:api.properties")
public class FeedServiceImpl implements FeedService {
private final static Logger logger = LoggerFactory.getLogger("feedlogger");
@Autowired
private Environment env;
@Autowired
private WebsocketClientImpl websocketClientImpl;
@Override
@PostConstruct
public void connectWs() {
String token = env.getProperty("ws.token", String.class);
websocketClientImpl.connectWebSocket(token);
}
}
}
答案 0 :(得分：0)
最后我解决了这个问题，我的WebSocketClient类与替换以下代码后netty websocket client example中的WebSocketClient几乎相同：
BufferedReader console = new BufferedReader(new InputStreamReader(System.in));
while (true) {
String msg = console.readLine();
if (msg == null) {
break;
} else if ("bye".equals(msg.toLowerCase())) {
ch.writeAndFlush(new CloseWebSocketFrame());
ch.closeFuture().sync();
break;
} else if ("ping".equals(msg.toLowerCase())) {
WebSocketFrame frame = new PingWebSocketFrame(Unpooled.wrappedBuffer(new byte[] { 8, 1, 8, 1 }));
ch.writeAndFlush(frame);
} else {
WebSocketFrame frame = new TextWebSocketFrame(msg);
ch.writeAndFlush(frame);
}
}
使用：
Thread.sleep(Integer.MAX_VALUE);
现在，websocket连接恢复正常。