[英]Netty - Client Write & Read Operation
我正在嘗試從服務器發送和接收消息。 該服務器已構建在遠程環境中。
這些代碼將作為字節發送。 此時,問題開始了。
當客戶端與服務器連接時,服務器立即發送100000050,並在幾毫秒后發送10000051。
我應該在收到10000051后發送10000060,但我不知道如何發送。
public static void main(String[] args) throws Exception {
EventLoopGroup group = new NioEventLoopGroup();
try {
Bootstrap clientBootstrap = new Bootstrap();
clientBootstrap.group(group);
clientBootstrap.channel(NioSocketChannel.class);
clientBootstrap.remoteAddress(new InetSocketAddress("10.80.15.70", 55102));
clientBootstrap.handler(new ChannelInitializer<SocketChannel>() {
protected void initChannel(SocketChannel socketChannel) throws Exception {
socketChannel.pipeline().addLast(new ClientHandler());
}
});
ChannelFuture channelFuture = clientBootstrap.connect().sync();
channelFuture.channel().closeFuture().sync();
}
finally {
group.shutdownGracefully().sync();
}
}
public class ClientHandler extends SimpleChannelInboundHandler<ByteBuf> {
private static final Logger LOGGER = Logger.getLogger( ClientHandler.class.getName() );
@Override
public void channelActive(ChannelHandlerContext channelHandlerContext){
//System.out.println("\nhelloo");
//channelHandlerContext.writeAndFlush(Unpooled.copiedBuffer("Netty Rocks!", CharsetUtil.UTF_8));
byte [] test = new byte[9];
test[0] = 0;
test[1] = 6;
test[2] = 0;
test[3] = 0;
test[4] = 0;
test[5] = 0;
test[6] = 0;
test[7] = 0;
test[8] = 1;
//byte [] message = "100000060".getBytes();
channelHandlerContext.writeAndFlush(test);
}
@Override
public void channelRead0(ChannelHandlerContext channelHandlerContext, ByteBuf in) {
System.out.println("Client received: " + in.toString(CharsetUtil.UTF_8));
}
@Override
public void exceptionCaught(ChannelHandlerContext channelHandlerContext, Throwable cause){
cause.printStackTrace();
LOGGER.info("Exception Occurred in ChannelHandler A");
channelHandlerContext.close();
}
/*@Override
protected void channelRead0(ChannelHandlerContext channelHandlerContext, Object o) throws Exception {
System.out.println("Client received: " + o.toString());
}*/
}
謝謝。
您可以通過更新channelRead0
方法來檢查收到的消息,然后在收到所需的消息時進行回復來做到這一點。
@Override
public void channelRead0(ChannelHandlerContext channelHandlerContext, ByteBuf in) {
String message = in.toString(CharsetUtil.UTF_8);
if (message.equals("10000051")) { //Now do what you were doing in channel active
byte [] test = new byte[9];
test[0] = 0;
test[1] = 6;
test[2] = 0;
test[3] = 0;
test[4] = 0;
test[5] = 0;
test[6] = 0;
test[7] = 0;
test[8] = 1;
//byte [] message = "100000060".getBytes();
channelHandlerContext.writeAndFlush(test);
}
}
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