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(){  
    
              @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() {  
             @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