netty基础入门（二）简单项目搭建

目的： 搭建简单的服务端和客户端进行通信

服务端搭建

1、新建java project项目，在src下面新建com.nettyServer的package

 nettyServer.java

 

package com.nettyServer;import io.netty.bootstrap.Bootstrap;import io.netty.bootstrap.ServerBootstrap;import io.netty.channel.Channel;import io.netty.channel.ChannelFuture;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.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 nettyServer {private static final int BIZGROUPSIZE = Runtime.getRuntime().availableProcessors()*2;      private static final int BIZTHREADSIZE = 100;      private static final EventLoopGroup bossGroup = new NioEventLoopGroup(BIZGROUPSIZE);      private static final EventLoopGroup workerGroup = new NioEventLoopGroup(BIZTHREADSIZE);         public static void main(String args[]){        //服务端      ServerBootstrap serverBootstrap;      //客户端      Bootstrap clientBootstrap;      //客户端通道      Channel clientChannel;      //服务端通道      Channel serverChannel ;          serverBootstrap = new ServerBootstrap();            serverBootstrap.group(bossGroup, workerGroup);            serverBootstrap.channel(NioServerSocketChannel.class);            //添加handler监听服务端的IO动作         // serverBootstrap.handler(new OutHandler());            serverBootstrap.childHandler(new ChannelInitializer<Channel>(){                    @Override                protected void initChannel(Channel arg0)                        throws Exception {                    // TODO Auto-generated method stub                    ChannelPipeline pipeline = arg0.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));                    //添加handler监听客户端Channel的状态变化                    pipeline.addLast(new TcpServerHandler());                }                            });            try {                //服务端启动                ChannelFuture cf = serverBootstrap.bind(56560).sync();                System.out.println("服务端启动成功，开始监听端口56560");            //  Toast.makeText(getActivity(), "TCP服务器已启动", Toast.LENGTH_SHORT).show();            } catch (InterruptedException e) {                // TODO Auto-generated catch block                e.printStackTrace();            }      }        }

OutHandler.java

package com.nettyServer;import java.net.SocketAddress;import io.netty.channel.ChannelHandlerContext;import io.netty.channel.ChannelOutboundHandlerAdapter;import io.netty.channel.ChannelPromise;public class OutHandler extends ChannelOutboundHandlerAdapter{      @Override      public void connect(ChannelHandlerContext ctx,              SocketAddress remoteAddress, SocketAddress localAddress,              ChannelPromise promise) throws Exception {          // TODO Auto-generated method stub          super.connect(ctx, remoteAddress, localAddress, promise);          System.out.println("<<<<<<<<<<<<<<< connect server success >>>>>>>>>>>>>>>>");      }        @Override      public void bind(ChannelHandlerContext ctx,              SocketAddress localAddress, ChannelPromise promise)              throws Exception {          // TODO Auto-generated method stub          super.bind(ctx, localAddress, promise);          System.out.println("<<<<<<<<<<<<<<< server bind success >>>>>>>>>>>>>>>>");      }  }

TcpServerhandler.java

package com.nettyServer;import io.netty.channel.ChannelHandlerContext;import io.netty.channel.ChannelInboundHandlerAdapter;public class TcpServerHandler extends ChannelInboundHandlerAdapter {      @Override      public void channelRead(ChannelHandlerContext ctx, Object msg)              throws Exception {          // TODO Auto-generated method stub          System.out.println("<<<<<<<<<<<<<<<<收到客户端消息 :"+ msg);          ctx.channel().writeAndFlush("<<<<<<<<<<服务端已经接收：" + msg);      }      @Override      public void channelActive(ChannelHandlerContext ctx) throws Exception {          // TODO Auto-generated method stub          System.out.println("通道已经启用>>>>>>>>");      //   clientChannel = ctx.channel();      }        @Override     public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {          System.out.println("exception is general");      }  }

客户端搭建： 新建一个java project项目  src下新建 com.nettyClient

nettyClient.java

package com.nettyClient;import io.netty.bootstrap.Bootstrap;import io.netty.channel.Channel;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.NioSocketChannel;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 nettyClient {    public static void main(String args[]){     EventLoopGroup group = new NioEventLoopGroup();         Bootstrap b = new Bootstrap();          b.group(group);          b.channel(NioSocketChannel.class).option(ChannelOption.TCP_NODELAY, true);          b.handler(new ChannelInitializer<SocketChannel>() {               @Override               protected void initChannel(SocketChannel ch) throws Exception {                   ChannelPipeline pipeline = ch.pipeline();                      pipeline.addLast("frameDecoder", new LengthFieldBasedFrameDecoder(Integer.MAX_VALUE, 0, 4, 0, 4));                      pipeline.addLast("frameEncoder", new LengthFieldPrepender(4));                      pipeline.addLast("decoder", new StringDecoder(CharsetUtil.UTF_8));                      pipeline.addLast("encoder", new StringEncoder(CharsetUtil.UTF_8));                       //添加一个Hanlder用来处理各种Channel状态                      pipeline.addLast("handlerIn", new ClientHandler());                       //添加一个Handler用来接收监听IO操作的                   //   pipeline.addLast("handlerOut", new OutHandler());               }           });          ChannelFuture f;          try {              //连接服务端          f = b.connect("127.0.0.1", 56560).sync();          Channel serverChannel = f.channel();          serverChannel.writeAndFlush("<<<<<<<<<<<<<<<<客户端请求连接>>>>>>>>>>>>>>>>");          } catch (InterruptedException e) {              // TODO Auto-generated catch block              e.printStackTrace();          }      }  }

Outhandler.java 

package com.nettyClient;import java.net.SocketAddress;import io.netty.channel.ChannelHandlerContext;import io.netty.channel.ChannelOutboundHandlerAdapter;import io.netty.channel.ChannelPromise;public class OutHandler extends ChannelOutboundHandlerAdapter{      @Override      public void connect(ChannelHandlerContext ctx,              SocketAddress remoteAddress, SocketAddress localAddress,              ChannelPromise promise) throws Exception {          // TODO Auto-generated method stub          super.connect(ctx, remoteAddress, localAddress, promise);          System.out.println("<<<<<<<<<<<<<<< connect server success >>>>>>>>>>>>>>>>");      }        @Override      public void bind(ChannelHandlerContext ctx,              SocketAddress localAddress, ChannelPromise promise)              throws Exception {          // TODO Auto-generated method stub          super.bind(ctx, localAddress, promise);          System.out.println("<<<<<<<<<<<<<<< server bind success >>>>>>>>>>>>>>>>");      }  }

ClientHandler.java 

package com.nettyClient;import io.netty.channel.ChannelHandlerContext;import io.netty.channel.ChannelInboundHandlerAdapter;public class ClientHandler extends ChannelInboundHandlerAdapter {      @Override      public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {          System.out.println("<<<<<<<<<客户端收到消息:" + msg);      }        @Override      public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {          System.out.println("client exception is general");      }  } 

引入的jar包，netty-3.5.5-Final.jar

运行项目就会进行服务端与客户端的通信