Netty5 服务端和客户端-copy

概述
netty 5 已经放弃掉了,作为学习netty4和5的差别不大,本例子是基于netty5

https://github.com/netty/netty/issues/4466

线程安全
一个thread + 队列 == 一个单线程线程池。线程安全的，任务是线性串行执行的

线程安全，不会产生阻塞效应 ，使用对象组

线程不安全，会产生阻塞效应， 使用对象池

Figure 1. 对象池
Figure 2. 对象组
writeAndFlush 发送消息线程安全
其中 EventExecutor executor 是 NioEventLoop 线程安全

public final class NioEventLoop extends SingleThreadEventLoop
代码
Server
/**
* 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();
}
}
}
ServerHandler
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();
}


}
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();
}
}
}
ClientHandler
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);
}

}
多连接客户端
MultClient

其中 synchronized(channel) 可以采用 单任务队列的方式

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;

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;

/**
* 多连接客户端
*
*
*/
public class MultClient {

/**
* 服务类
*/
private Bootstrap bootstrap = new Bootstrap();

/**
* 会话
*/
private List<Channel> channels = new ArrayList<>();

/**
* 引用计数
*/
private final AtomicInteger index = new AtomicInteger();

/**
* 初始化
* @param count
*/
public void init(int count){

//worker
EventLoopGroup worker = new NioEventLoopGroup();

//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());
}
});

for(int i=1; i<=count; i++){
ChannelFuture future = bootstrap.connect("192.168.0.103", 10101);
channels.add(future.channel());
}
}

/**
* 获取会话
* @return
*/
public Channel nextChannel(){
return getFirstActiveChannel(0);
}


private Channel getFirstActiveChannel(int count){
Channel channel = channels.get(Math.abs(index.getAndIncrement() % channels.size()));
if(!channel.isActive()){
//重连
reconnect(channel);
if(count >= channels.size()){
throw new RuntimeException("no can use channel");
}
return getFirstActiveChannel(count + 1);
}
return channel;
}

/**
* 重连
* @param channel
*/
private void reconnect(Channel channel){
synchronized(channel){
if(channels.indexOf(channel) == -1){
return ;
}

Channel newChannel = bootstrap.connect("192.168.0.103", 10101).channel();
channels.set(channels.indexOf(channel), newChannel);
}
}

}
Start

import java.io.BufferedReader;
import java.io.InputStreamReader;
/**
* 启动类
*
*
*/
public class Start {

public static void main(String[] args) {

MultClient client = new MultClient();
client.init(5);

BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
while(true){
try {
System.out.println("请输入:");
String msg = bufferedReader.readLine();
client.nextChannel().writeAndFlush(msg);
} catch (Exception e) {
e.printStackTrace();
}
}
}

netty心跳-copy

 

概述
心跳对于服务端来说，定时清除闲置会话inactive(netty5) channelclose(netty3)

心跳对客户端来说，用来检测会话是否断开，是否重连！ 用来检测网络延时！

netty3
package com.heart;

import java.net.InetSocketAddress;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import org.jboss.netty.bootstrap.ServerBootstrap;
import org.jboss.netty.channel.ChannelPipeline;
import org.jboss.netty.channel.ChannelPipelineFactory;
import org.jboss.netty.channel.Channels;
import org.jboss.netty.channel.socket.nio.NioServerSocketChannelFactory;
import org.jboss.netty.handler.codec.string.StringDecoder;
import org.jboss.netty.handler.codec.string.StringEncoder;
import org.jboss.netty.handler.timeout.IdleStateHandler;
import org.jboss.netty.util.HashedWheelTimer;

/**
* netty服务端入门
*/
public class Server {

public static void main(String[] args) {

//服务类
ServerBootstrap bootstrap = new ServerBootstrap();

//boss线程监听端口，worker线程负责数据读写
ExecutorService boss = Executors.newCachedThreadPool();
ExecutorService worker = Executors.newCachedThreadPool();

//设置niosocket工厂
bootstrap.setFactory(new NioServerSocketChannelFactory(boss, worker));

final HashedWheelTimer hashedWheelTimer = new HashedWheelTimer();
//设置管道的工厂
bootstrap.setPipelineFactory(new ChannelPipelineFactory() {

@Override
public ChannelPipeline getPipeline() throws Exception {

ChannelPipeline pipeline = Channels.pipeline();
pipeline.addLast("idle", new IdleStateHandler(hashedWheelTimer, 5, 5, 10));
pipeline.addLast("decoder", new StringDecoder());
pipeline.addLast("encoder", new StringEncoder());
pipeline.addLast("helloHandler", new HelloHandler());
return pipeline;
}
});

bootstrap.bind(new InetSocketAddress(10101));

System.out.println("start!!!");

}

}
package com.heart;

import org.jboss.netty.channel.ChannelEvent;
import org.jboss.netty.channel.ChannelFuture;
import org.jboss.netty.channel.ChannelFutureListener;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.channel.MessageEvent;
import org.jboss.netty.channel.SimpleChannelHandler;
import org.jboss.netty.handler.timeout.IdleState;
import org.jboss.netty.handler.timeout.IdleStateEvent;

public class HelloHandler extends SimpleChannelHandler {

@Override
public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) throws Exception {
System.out.println(e.getMessage());
}

@Override
public void handleUpstream(final ChannelHandlerContext ctx, ChannelEvent e) throws Exception {
if (e instanceof IdleStateEvent) {
if (((IdleStateEvent) e).getState() == IdleState.ALL_IDLE) {
System.out.println("提玩家下线");
//关闭会话,踢玩家下线
ChannelFuture write = ctx.getChannel().write("time out, you will close");
write.addListener(new ChannelFutureListener() {

@Override
public void operationComplete(ChannelFuture future) throws Exception {
ctx.getChannel().close();
}
});
}
} else {
super.handleUpstream(ctx, e);
}
}

}
netty 5
package com.heart;

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;
import io.netty.handler.timeout.IdleStateHandler;

/**
* 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 IdleStateHandler(5, 5, 10));
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();
}
}
}
package com.heart;

import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.timeout.IdleState;
import io.netty.handler.timeout.IdleStateEvent;

/**
* 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");
}

@Override
public void userEventTriggered(final ChannelHandlerContext ctx, Object evt) throws Exception {
if (evt instanceof IdleStateEvent) {
IdleStateEvent event = (IdleStateEvent) evt;
if (event.state() == IdleState.ALL_IDLE) {

//清除超时会话
ChannelFuture writeAndFlush = ctx.writeAndFlush("you will close");
writeAndFlush.addListener(new ChannelFutureListener() {

@Override
public void operationComplete(ChannelFuture future) throws Exception {
ctx.channel().close();
}
});
}
} else {
super.userEventTriggered(ctx, evt);
}
}

/**
* 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();
}