Socket Client 怎么连接 Netty Server

AlenCheng 2015-03-06 05:47:08

如题，想在需要用Netty做一个Server端。用来接收Socket Client发送的Request.
感觉已经连接上了，但是就是没有把请求文本打出来。不知道是怎么回事了。

Netty Server



package server;



import io.netty.bootstrap.ServerBootstrap;

import io.netty.channel.ChannelFuture;

import io.netty.channel.ChannelInitializer;

import io.netty.channel.ChannelOption;

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.NioServerSocketChannel;

import io.netty.handler.codec.LengthFieldBasedFrameDecoder;

import io.netty.handler.codec.LengthFieldPrepender;

import io.netty.handler.codec.string.StringDecoder;

import io.netty.handler.codec.string.StringEncoder;

import io.netty.util.CharsetUtil;



public class MyNettyServer {

	

	ChannelFuture f = null;

	

	EventLoopGroup bossGroup = new NioEventLoopGroup();

	EventLoopGroup workerGroup = new NioEventLoopGroup();

	

	private void run(int port) {

		try {

			// Configure the server.

			ServerBootstrap b = new ServerBootstrap();

			b.group(bossGroup, workerGroup)

				.channel(NioServerSocketChannel.class)

				.option(ChannelOption.SO_BACKLOG, 128)

				.option(ChannelOption.SO_KEEPALIVE, true)

				.childHandler(new ChannelInitializer<SocketChannel>() {

						// 有连接到达时会创建一个Channel

						@Override

						protected void initChannel(SocketChannel channel) throws Exception {

							System.out.println("has a request....");

							ChannelPipeline pipeline = channel.pipeline();

							pipeline.addLast(new LengthFieldBasedFrameDecoder(Integer.MAX_VALUE, 0, 4, 0, 4));

							pipeline.addLast(new LengthFieldPrepender(4));

							pipeline.addLast(new StringDecoder(CharsetUtil.UTF_8));

							pipeline.addLast(new StringEncoder(CharsetUtil.UTF_8));

							// 在Channel队列中，添加自己的Handler处理业务

							pipeline.addLast(new HttpServerInboundHandler());

						}

				});

			

			// 配置完成，开始绑定server，通过调用sync同步方法阻塞直到绑定成功

			f = b.bind(port).sync();

			System.out.println("Server statrted ...");

			// 应用程序会一直等待，直到channel关闭

			f.channel().closeFuture().sync();

		} catch (Exception e) {

			

		}

	}

	

	private void shutdown() {

		workerGroup.shutdownGracefully();

		bossGroup.shutdownGracefully();

	}



	/**

	 * @param args

	 */

	public static void main(String[] args) throws Exception {

		MyNettyServer server = new MyNettyServer();

		server.run(8000);

	}	

}

Netty handler



package server;



import io.netty.channel.ChannelHandlerContext;

import io.netty.channel.ChannelInboundHandlerAdapter;



public class HttpServerInboundHandler extends ChannelInboundHandlerAdapter {



	@Override

	public void channelRead(ChannelHandlerContext ctx, Object msg)

			throws Exception {

		System.out.println("server receive message : "+ msg);

		ctx.channel().writeAndFlush("server response message : " + msg + "...");

		ctx.close();

	}



	@Override

	public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {

		System.out.println("read complete...");

		ctx.close();

	}



	@Override

	public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {

		System.out.println("throw exption...");

		ctx.close();

	}

}

Socket Client



package client;



import java.io.BufferedReader;

import java.io.InputStreamReader;

import java.io.PrintWriter;

import java.net.Socket;



public class MySocketClient {



	/**

	 * @param args

	 */

	public static void main(String[] args) throws Exception {

		Socket client=new Socket("127.0.0.1", 8000);

		PrintWriter pw=new PrintWriter(client.getOutputStream());  

		pw.write(“hello!”);

		pw.flush();

		pw.close();

		br.close();

	}



}

运行完Client以后的结果
Server statrted ...
has a request....

说明已经连接到了Netty，但是请求的文本没有过来。
麻烦各位帮忙看下了，谢谢！

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我的马儿有些瘦 2018-12-18

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pipeline.addLast(new LengthFieldBasedFrameDecoder(Integer.MAX_VALUE, 0, 4, 0, 4));
pipeline.addLast(new LengthFieldPrepender(4));
pipeline.addLast(new StringDecoder(CharsetUtil.UTF_8));
pipeline.addLast(new StringEncoder(CharsetUtil.UTF_8));

这四行全删除，试一下

mvp_yezi 2018-09-04

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刚好遇到同样问题，handler里面读取的部分，直接上代码。客户端传的是byte，用的是8楼的思路，只是8楼没说清楚
public void channelRead(ChannelHandlerContext ctx, Object msg) {
ByteBuf in = (ByteBuf) msg;

String abc = convertByteBufToString(in);

withawind 2018-08-03

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引用 8 楼 qq_35023312 的回复:

应该是这几个解码方法不能有效的解释传递过来的参数：
pipeline.addLast(new LengthFieldBasedFrameDecoder(Integer.MAX_VALUE, 0, 4, 0, 4));
pipeline.addLast(new LengthFieldPrepender(4));
pipeline.addLast(new StringDecoder(CharsetUtil.UTF_8));
pipeline.addLast(new StringEncoder(CharsetUtil.UTF_8));

如果client传递的参数是使用类似以下方法，那应该使用ByteArrayDecoder、ByteArrayEncoder就可以了：
byte[] bytes = content.getBytes();
ByteBuffer buffer = ByteBuffer.wrap(bytes);
socketChannel.write(buffer);
socketChannel.socket().shutdownOutput();

你这客户端用的是netty 我们要求的是使用基本的socket

huage 2017-11-24

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Socket client=new Socket("127.0.0.1", 8000); PrintWriter pw=new PrintWriter(client.getOutputStream()); pw.write(“hello!”);//这里输入了流马上就关闭了，所以接收不到了输入了等待响应了在关闭就可以了 pw.flush(); pw.close(); br.close();

xiacal 2017-06-07

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楼主，请问下是怎么解决的，我传了长度，任然报同样的错

zhanghe086 2017-02-04

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怎么解决的呢？难道不用netty了？

zrtlin 2017-01-18

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请问怎么解决的

qq_35023312 2016-05-17

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应该是这几个解码方法不能有效的解释传递过来的参数： pipeline.addLast(new LengthFieldBasedFrameDecoder(Integer.MAX_VALUE, 0, 4, 0, 4)); pipeline.addLast(new LengthFieldPrepender(4)); pipeline.addLast(new StringDecoder(CharsetUtil.UTF_8)); pipeline.addLast(new StringEncoder(CharsetUtil.UTF_8)); 如果client传递的参数是使用类似以下方法，那应该使用ByteArrayDecoder、ByteArrayEncoder就可以了： byte[] bytes = content.getBytes(); ByteBuffer buffer = ByteBuffer.wrap(bytes); socketChannel.write(buffer); socketChannel.socket().shutdownOutput();

b2125267 2016-03-04