项目结构
pom.xml
<dependency> <groupId>io.netty</groupId> <artifactId>netty-all</artifactId> <version>4.1.24.Final</version> </dependency>
server端
package com.tian.netty.first.server;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioServerSocketChannel;
/**
* 服务端启动类
*
* @author lawt
*/
public class HelloServer {
/**
* 服务端端口
*/
private static final int PORT = 8081;
public static void main(String[] args) {
//一个是boss线程一个是worker线程
EventLoopGroup bossGroup = new NioEventLoopGroup();
EventLoopGroup workerGroup = new NioEventLoopGroup();
try {
ServerBootstrap b = new ServerBootstrap();
b.group(bossGroup, workerGroup);
b.channel(NioServerSocketChannel.class);
b.childHandler(new HelloServerInitializer());
// 绑定端口监听
ChannelFuture f = b.bind(PORT).sync();
// 监听服务器关闭监听
f.channel().closeFuture().sync();
// 可以简写为
/* b.bind(portNumber).sync().channel().closeFuture().sync(); */
} catch (Exception ex) {
ex.printStackTrace();
} finally {
bossGroup.shutdownGracefully();
workerGroup.shutdownGracefully();
}
}
}run HelloServer
client端
package com.tian.netty.first.client;
import io.netty.bootstrap.Bootstrap;
import io.netty.channel.Channel;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioSocketChannel;
import java.io.BufferedReader;
import java.io.InputStreamReader;
/**
* 启动好了就可以在控制台输入内容，然后回车键
*
* @author lawt
*/
public class HelloClient {
private static String HOST = "127.0.0.1";
private static int PORT = 8081;
public static void main(String[] args) {
EventLoopGroup group = new NioEventLoopGroup();
try {
Bootstrap b = new Bootstrap();
b.group(group)
.channel(NioSocketChannel.class)
.handler(new HelloClientInitializer());
// 连接服务端
Channel ch = b.connect(HOST, PORT).sync().channel();
// 控制台输入
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
for (; ; ) {
String line = in.readLine();
if (line == null) {
continue;
}
/**
* 向服务端发送在控制台输入的文本 并用"\r\n"结尾
* 之所以用\r\n结尾 是因为我们在handler中添加了 DelimiterBasedFrameDecoder 帧解码。
* 这个解码器是一个根据\n符号位分隔符的解码器。所以每条消息的最后必须加上\n否则无法识别和解码
* */
ch.writeAndFlush(line + "\r\n");
}
} catch (Exception e) {
e.printStackTrace();
} finally {
// The connection is closed automatically on shutdown.
group.shutdownGracefully();
}
}
}package com.tian.netty.first.client;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.socket.SocketChannel;
import io.netty.handler.codec.DelimiterBasedFrameDecoder;
import io.netty.handler.codec.Delimiters;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.codec.string.StringEncoder;
/**
* @author lawt
*/
public class HelloClientInitializer extends ChannelInitializer<SocketChannel> {
@Override
protected void initChannel(SocketChannel ch) throws Exception {
ChannelPipeline pipeline = ch.pipeline();
/**
* 这个地方的 必须和服务端对应上。否则无法正常解码和编码
*
* 解码和编码 我将会在下一张为大家详细的讲解。再次暂时不做详细的描述
*
* */
pipeline.addLast("framer", new DelimiterBasedFrameDecoder(
8192, Delimiters.lineDelimiter()));
pipeline.addLast("decoder", new StringDecoder());
pipeline.addLast("encoder", new StringEncoder());
// 客户端的逻辑
pipeline.addLast("handler", new HelloClientHandler());
}
}run HelloClient
输入：你好
服务端返回
server端收到
OK，这样一个netty demo就搞定了
代码下载地址：
https://github.com/sunmutian/springmvc4tian/tree/master/dubbo-demo
