Java 简单Netty Echo服务器/客户端未接收消息
我正试图用Netty编写一个简单的echo服务器。我读这本书是为了了解一些理论,学习Netty的核心基础知识。客户端已成功连接,但没有来自客户端的消息。我能够通过telnet将消息发送到服务器并接收响应,因此我猜问题出在客户端,我只是不知道出了什么问题,因为我是Netty的新手 以下是客户:Java 简单Netty Echo服务器/客户端未接收消息,java,tcp,client-server,netty,Java,Tcp,Client Server,Netty,我正试图用Netty编写一个简单的echo服务器。我读这本书是为了了解一些理论,学习Netty的核心基础知识。客户端已成功连接,但没有来自客户端的消息。我能够通过telnet将消息发送到服务器并接收响应,因此我猜问题出在客户端,我只是不知道出了什么问题,因为我是Netty的新手 以下是客户: public class Client { private final String host; private final int port; public Client(St
public class Client {
private final String host;
private final int port;
public Client(String host, int port) {
this.host = host;
this.port = port;
}
public void start() throws Exception {
EventLoopGroup group = new NioEventLoopGroup();
try {
Bootstrap b = new Bootstrap();
b.group(group).channel(NioSocketChannel.class)
.remoteAddress(new InetSocketAddress(host, port))
.handler(new ChannelInitializer<SocketChannel>() {
@Override
public void initChannel(SocketChannel ch) throws Exception {
ch.pipeline().addLast(new EchoClientHandler());
}
});
ChannelFuture f = b.connect().sync();
f.channel().closeFuture().sync();
} finally {
group.shutdownGracefully().sync();
}
}
public static void main (String [] args) throws Exception {
new Client("127.0.0.1", 11235).start();
}
}
这一定是我错过的小东西,所以任何帮助都会让我保持短暂的理智,我将不胜感激 在您的客户端句柄中使用
writeAndFlush
而不是write
:
public void channelActive(ChannelHandlerContext ctx) {
System.out.println("Connected");
ctx.writeAndFlush(Unpooled.copiedBuffer("Netty MAY rock!", CharsetUtil.UTF_8));
}
谢谢,成功了!还有@NormanMaurer尊敬作者先生,等待下一次更新!
public class EchoServer {
private final int port;
public EchoServer(int port) {
this.port = port;
}
public void start() throws Exception {
EventLoopGroup group = new NioEventLoopGroup();
try {
ServerBootstrap b = new ServerBootstrap();
b.group(group)
.channel(NioServerSocketChannel.class)
.localAddress(new InetSocketAddress(port))
.childHandler(new ChannelInitializer<SocketChannel>() {
@Override
public void initChannel(SocketChannel ch) throws Exception {
System.out.println("New client connected: " + ch.localAddress());
ch.pipeline().addLast(new EchoServerHandler());
}
});
ChannelFuture f = b.bind().sync();
f.channel().closeFuture().sync();
} finally {
group.shutdownGracefully().sync();
}
}
public static void main (String [] args) throws Exception {
new EchoServer(11235).start();
}
}
@Sharable
public class EchoServerHandler extends ChannelInboundHandlerAdapter {
public void channelRead(ChannelHandlerContext ctx, Object msg) {
ByteBuf in = (ByteBuf) msg;
System.out.println(
"Server received: " + in.toString(CharsetUtil.UTF_8));
ctx.write(in);
}
public void channelReadComplete(ChannelHandlerContext ctx) {
ctx.writeAndFlush(Unpooled.EMPTY_BUFFER)
.addListener(ChannelFutureListener.CLOSE);
}
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
cause.printStackTrace();
ctx.close();
}
}
public void channelActive(ChannelHandlerContext ctx) {
System.out.println("Connected");
ctx.writeAndFlush(Unpooled.copiedBuffer("Netty MAY rock!", CharsetUtil.UTF_8));
}