Netty入门（四）——服务端与客户端案例netty5.x

男娘i 2022-05-22 13:07 263阅读 0赞

上一篇已用3.X版实现，这篇已5.X方式实现：实现方式有些稍微变化

客户端案例：

ClientHandler.java

package com.client;
    
    import io.netty.channel.ChannelHandlerContext;
    import io.netty.channel.SimpleChannelInboundHandler;
    /**
     * 客户端消息处理
     *
     */
    public class ClientHandler extends SimpleChannelInboundHandler<String> {
    
    	@Override
    	protected void messageReceived(ChannelHandlerContext ctx, String msg) throws Exception {
    		System.out.println("客户端收到消息:"+msg);
    	}
    
    }

Client.class

package com.client;
    
    import java.io.BufferedReader;
    import java.io.InputStreamReader;
    
    import io.netty.bootstrap.Bootstrap;
    import io.netty.channel.Channel;
    import io.netty.channel.ChannelFuture;
    import io.netty.channel.ChannelInitializer;
    import io.netty.channel.EventLoopGroup;
    import io.netty.channel.nio.NioEventLoopGroup;
    import io.netty.channel.socket.nio.NioSocketChannel;
    import io.netty.handler.codec.string.StringDecoder;
    import io.netty.handler.codec.string.StringEncoder;
    
    /**
     * netty5的客户端
     *
     */
    public class Client {
    
    	public static void main(String[] args) {
    		//服务类
    		Bootstrap bootstrap = new Bootstrap();
    		
    		//worker
    		EventLoopGroup worker = new NioEventLoopGroup();
    		
    		try {
    			//设置线程池
    			bootstrap.group(worker);
    			
    			//设置socket工厂、
    			bootstrap.channel(NioSocketChannel.class);
    			
    			//设置管道
    			bootstrap.handler(new ChannelInitializer<Channel>() {
    
    				@Override
    				protected void initChannel(Channel ch) throws Exception {
    					ch.pipeline().addLast(new StringDecoder());
    					ch.pipeline().addLast(new StringEncoder());
    					ch.pipeline().addLast(new ClientHandler());
    				}
    			});
    			
    			ChannelFuture connect = bootstrap.connect("127.0.0.1", 10101);
    			
    			BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
    			while(true){
    				System.out.println("请输入：");
    				String msg = bufferedReader.readLine();
    				connect.channel().writeAndFlush(msg);
    			}
    			
    		} catch (Exception e) {
    			 e.printStackTrace();
    		} finally{
    			worker.shutdownGracefully();
    		}
    	}
    }

服务器端案例：

ServerHandler.java

package com.server;
    
    import io.netty.channel.ChannelHandlerContext;
    import io.netty.channel.SimpleChannelInboundHandler;
    /**
     * 服务端消息处理
     *
     */
    public class ServerHandler extends SimpleChannelInboundHandler<String> {
    
    	@Override
    	protected void messageReceived(ChannelHandlerContext ctx, String msg) throws Exception {
    
    		System.out.println(msg);
    		
    		ctx.channel().writeAndFlush("hi");
    		ctx.writeAndFlush("hi");
    	}
    
    	/**
    	 * 新客户端接入
    	 */
    	@Override
    	public void channelActive(ChannelHandlerContext ctx) throws Exception {
    		System.out.println("channelActive");
    	}
    
    	/**
    	 * 客户端断开
    	 */
    	@Override
    	public void channelInactive(ChannelHandlerContext ctx) throws Exception {
    		System.out.println("channelInactive");
    	}
    
    	/**
    	 * 异常
    	 */
    	@Override
    	public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
    		cause.printStackTrace();
    	}
    	
    	
    }

Server.class

package com.server;
    
    import io.netty.bootstrap.ServerBootstrap;
    import io.netty.channel.Channel;
    import io.netty.channel.ChannelFuture;
    import io.netty.channel.ChannelInitializer;
    import io.netty.channel.ChannelOption;
    import io.netty.channel.EventLoopGroup;
    import io.netty.channel.nio.NioEventLoopGroup;
    import io.netty.channel.socket.nio.NioServerSocketChannel;
    import io.netty.handler.codec.string.StringDecoder;
    import io.netty.handler.codec.string.StringEncoder;
    
    /**
     * netty5服务端
     *
     */
    public class Server {
    
    	public static void main(String[] args) {
    		//服务类
    		ServerBootstrap bootstrap = new ServerBootstrap();
    		
    		//boss和worker
    		EventLoopGroup boss = new NioEventLoopGroup();
    		EventLoopGroup worker = new NioEventLoopGroup();
    		
    		try {
    			//设置线程池
    			bootstrap.group(boss, worker);
    			
    			//设置socket工厂、
    			bootstrap.channel(NioServerSocketChannel.class);
    			
    			//设置管道工厂
    			bootstrap.childHandler(new ChannelInitializer<Channel>() {
    
    				@Override
    				protected void initChannel(Channel ch) throws Exception {
    					ch.pipeline().addLast(new StringDecoder());
    					ch.pipeline().addLast(new StringEncoder());
    					ch.pipeline().addLast(new ServerHandler());
    				}
    			});
    			
    			//netty3中对应设置如下
    			//bootstrap.setOption("backlog", 1024);
    			//bootstrap.setOption("tcpNoDelay", true);
    			//bootstrap.setOption("keepAlive", true);
    			//设置参数，TCP参数
    			bootstrap.option(ChannelOption.SO_BACKLOG, 2048);//serverSocketchannel的设置，链接缓冲池的大小
    			bootstrap.childOption(ChannelOption.SO_KEEPALIVE, true);//socketchannel的设置,维持链接的活跃，清除死链接
    			bootstrap.childOption(ChannelOption.TCP_NODELAY, true);//socketchannel的设置,关闭延迟发送
    			
    			//绑定端口
    			ChannelFuture future = bootstrap.bind(10101);
    			
    			System.out.println("start");
    			
    			//等待服务端关闭
    			future.channel().closeFuture().sync();
    			
    		} catch (Exception e) {
    			e.printStackTrace();
    		} finally{
    			//释放资源
    			boss.shutdownGracefully();
    			worker.shutdownGracefully();
    		}
    	}
    }

后续继续完善与优化