- github地址：https://github.com/netty/netty
- 官网：http://netty.io
- Demo地址：
一、Netty Server端
- IDE和构建工具:eclipse meaven
- Netty版本号:5.0.0.Alpha2
1. 新建工程，通过meaven导入Netty的库包
找到工程中的pom.xml文件，在dependencies中添加如下代码
<dependency>
<groupId>io.netty</groupId>
<artifactId>netty-all</artifactId>
<version>5.0.0.Alpha2</version>
</dependency>
2. 创建NettyServer
新建NettyServer类
package com.jiutianbian.NettyTest;
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;
public class NettyServer {
private int port;
public NettyServer(int port) {
this.port = port;
bind();
}
private void bind() {
EventLoopGroup boss = new NioEventLoopGroup();
EventLoopGroup worker = new NioEventLoopGroup();
try {
ServerBootstrap bootstrap = new ServerBootstrap();
bootstrap.group(boss, worker);
bootstrap.channel(NioServerSocketChannel.class);
bootstrap.option(ChannelOption.SO_BACKLOG, 1024); // 连接数
bootstrap.option(ChannelOption.TCP_NODELAY, true); // 不延迟，消息立即发送
bootstrap.childOption(ChannelOption.SO_KEEPALIVE, true); // 长连接
bootstrap.childHandler(new ChannelInitializer<SocketChannel>() {
@Override
protected void initChannel(SocketChannel socketChannel)
throws Exception {
ChannelPipeline p = socketChannel.pipeline();
p.addLast(new NettyServerHandler());// 添加NettyServerHandler，用来处理Server端接收和处理消息的逻辑
}
});
ChannelFuture channelFuture = bootstrap.bind(port).sync();
if (channelFuture.isSuccess()) {
System.err.println("启动Netty服务成功，端口号：" + this.port);
}
// 关闭连接
channelFuture.channel().closeFuture().sync();
} catch (Exception e) {
System.err.println("启动Netty服务异常，异常信息：" + e.getMessage());
e.printStackTrace();
} finally {
boss.shutdownGracefully();
worker.shutdownGracefully();
}
}
public static void main(String[] args) throws InterruptedException {
new NettyServer(10086);
}
}
3. 创建NettyServerHandler，用来接收和回复Client端的消息
新建NettyServerHandler类，用来实现Server端接收和处理消息的逻辑
package com.jiutianbian.NettyTest;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerAdapter;
import io.netty.channel.ChannelHandlerContext;
import java.io.UnsupportedEncodingException;
public class NettyServerHandler extends ChannelHandlerAdapter {
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) {
ByteBuf buf = (ByteBuf) msg;
String recieved = getMessage(buf);
System.err.println("服务器接收到客户端消息：" + recieved);
try {
ctx.writeAndFlush(getSendByteBuf("你好，客户端"));
System.err.println("服务器回复消息：你好，客户端");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
}
/*
* 从ByteBuf中获取信息 使用UTF-8编码返回
*/
private String getMessage(ByteBuf buf) {
byte[] con = new byte[buf.readableBytes()];
buf.readBytes(con);
try {
return new String(con, "UTF8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
return null;
}
}
private ByteBuf getSendByteBuf(String message)
throws UnsupportedEncodingException {
byte[] req = message.getBytes("UTF-8");
ByteBuf pingMessage = Unpooled.buffer();
pingMessage.writeBytes(req);
return pingMessage;
}
}
4. 启动Server端
Server启动后的日志输出，如下图所示
一、Netty Client端
1. 新建工程，通过meaven导入Netty的库包
导入代码同上面的Server端代码
2. 创建NettyClient
新建NettyClient类
package com.jiutianbian.NettyClinetTest;
import io.netty.bootstrap.Bootstrap;
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.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
public class NettyClient {
/*
* 服务器端口号
*/
private int port;
/*
* 服务器IP
*/
private String host;
public NettyClient(int port, String host) throws InterruptedException {
this.port = port;
this.host = host;
start();
}
private void start() throws InterruptedException {
EventLoopGroup eventLoopGroup = new NioEventLoopGroup();
try {
Bootstrap bootstrap = new Bootstrap();
bootstrap.channel(NioSocketChannel.class);
bootstrap.option(ChannelOption.SO_KEEPALIVE, true);
bootstrap.group(eventLoopGroup);
bootstrap.remoteAddress(host, port);
bootstrap.handler(new ChannelInitializer<SocketChannel>() {
@Override
protected void initChannel(SocketChannel socketChannel)
throws Exception {
socketChannel.pipeline().addLast(new NettyClientHandler());
}
});
ChannelFuture channelFuture = bootstrap.connect(host, port).sync();
if (channelFuture.isSuccess()) {
System.err.println("连接服务器成功");
}
channelFuture.channel().closeFuture().sync();
} finally {
eventLoopGroup.shutdownGracefully();
}
}
public static void main(String[] args) throws InterruptedException {
new NettyClient(10086, "localhost");
}
}
3. 创建NettyClientHandler，用来向Server端的发送消息并处理回复信息
新建NettyClientHandler类，用来实现Server端接收和处理消息的逻辑
package com.jiutianbian.NettyClinetTest;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerAdapter;
import io.netty.channel.ChannelHandlerContext;
import java.io.UnsupportedEncodingException;
public class NettyClientHandler extends ChannelHandlerAdapter {
private ByteBuf firstMessage;
@Override
public void channelActive(ChannelHandlerContext ctx) throws Exception {
byte[] data = "你好，服务器".getBytes();
firstMessage = Unpooled.buffer();
firstMessage.writeBytes(data);
ctx.writeAndFlush(firstMessage);
System.err.println("客户端发送消息:你好，服务器");
}
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg)
throws Exception {
ByteBuf buf = (ByteBuf) msg;
String rev = getMessage(buf);
System.err.println("客户端收到服务器消息:" + rev);
}
private String getMessage(ByteBuf buf) {
byte[] con = new byte[buf.readableBytes()];
buf.readBytes(con);
try {
return new String(con, "UTF8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
return null;
}
}
}
4. 启动Client端
Client启动后的Client端的日志输出，如下图所示
Server端日志输出，此时如下
