Netty demo 时间查询

package com.jiepu.netty2.time;

import io.netty.bootstrap.ServerBootstrap;
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.NioServerSocketChannel;

/**
* server 有粘包问题
*
* @author xwalker
*/
public class TimeServer {
public void bind(int port) throws Exception {
// 服务器线程组 用于网络事件的处理 一个用于服务器接收客户端的连接
// 另一个线程组用于处理SocketChannel的网络读写
EventLoopGroup bossGroup = new NioEventLoopGroup();
EventLoopGroup workerGroup = new NioEventLoopGroup();
try {
// NIO服务器端的辅助启动类 降低服务器开发难度
ServerBootstrap serverBootstrap = new ServerBootstrap();
serverBootstrap.group(bossGroup, workerGroup)
.channel(NioServerSocketChannel.class)// 类似NIO中serverSocketChannel
.option(ChannelOption.SO_BACKLOG, 1024)// 配置TCP参数
.childHandler(new ChildChannelHandler());// 最后绑定I/O事件的处理类
// 处理网络IO事件

// 服务器启动后 绑定监听端口 同步等待成功 主要用于异步操作的通知回调 回调处理用的ChildChannelHandler
ChannelFuture f = serverBootstrap.bind(port).sync();
System.out.println("timeServer启动");
// 等待服务端监听端口关闭
f.channel().closeFuture().sync();

} finally {
// 优雅退出 释放线程池资源
bossGroup.shutdownGracefully();
workerGroup.shutdownGracefully();
System.out.println("服务器优雅的释放了线程资源...");
}

}

/**
* 网络事件处理器
*/
private class ChildChannelHandler extends ChannelInitializer<SocketChannel> {
@Override
protected void initChannel(SocketChannel ch) throws Exception {
ch.pipeline().addLast(new TimeServerHandler());
}

}

public static void main(String[] args) throws Exception {
int port = 8000;
new TimeServer().bind(port);
}

}

package com.jiepu.netty2.time;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerAdapter;
import io.netty.channel.ChannelHandlerContext;

import java.util.Date;
/**
* server端网络IO事件处理
* @author xwalker
*
*/
public class TimeServerHandler extends ChannelHandlerAdapter {
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg)
throws Exception {
System.out.println("服务器读取到客户端请求...");
ByteBuf buf=(ByteBuf) msg;
byte[] req=new byte[buf.readableBytes()];
buf.readBytes(req);
String body=new String(req,"UTF-8");
System.out.println("the time server receive order:"+body);
String curentTime="QUERY TIME ORDER".equalsIgnoreCase(body)?new Date(System.currentTimeMillis()).toString():"BAD ORDER";
ByteBuf resp=Unpooled.copiedBuffer(curentTime.getBytes());
ctx.write(resp);
System.out.println("服务器做出了响应");
}

@Override
public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
ctx.flush();
System.out.println("服务器readComplete 响应完成");
}

@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause)
throws Exception {
ctx.close();
System.out.println("服务器异常退出"+cause.getMessage());
}
}

package com.jiepu.netty2.time;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerAdapter;
import io.netty.channel.ChannelHandlerContext;

import java.util.logging.Logger;
/**
* Client 网络IO事件处理
* @author xwalker
*
*/
public class TimeClientHandler extends ChannelHandlerAdapter {
private static final Logger logger=Logger.getLogger(TimeClientHandler.class.getName());
private  ByteBuf firstMessage;
public TimeClientHandler(){
byte[] req ="QUERY TIME ORDER".getBytes();
firstMessage=Unpooled.buffer(req.length);
firstMessage.writeBytes(req);
}
@Override
public void channelActive(ChannelHandlerContext ctx) throws Exception {
ctx.writeAndFlush(firstMessage);
System.out.println("客户端active");
}

@Override
public void channelRead(ChannelHandlerContext ctx, Object msg)
throws Exception {
System.out.println("客户端收到服务器响应数据");
ByteBuf buf=(ByteBuf) msg;
byte[] req=new byte[buf.readableBytes()];
buf.readBytes(req);
String body=new String(req,"UTF-8");
System.out.println("Now is:"+body);

}

@Override
public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
ctx.flush();
System.out.println("客户端收到服务器响应数据处理完成");
}

@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause)
throws Exception {
logger.warning("Unexpected exception from downstream:"+cause.getMessage());
ctx.close();
System.out.println("客户端异常退出");
}
}

package com.jiepu.netty2.time;

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;
/**
* client 存在TCP粘包问题
* @author xwlaker
* Netty实现简单的时间查询服务
* http://www.oschina.net/code/snippet_374_44686 *
*/
public class TimeClient {
/**
* 连接服务器
* @param port
* @param host
* @throws Exception
*/
public void connect(int port, String host) throws Exception {
//配置客户端NIO线程组
EventLoopGroup group = new NioEventLoopGroup();
try {
//客户端辅助启动类 对客户端配置
Bootstrap b = new Bootstrap();
b.group(group).channel(NioSocketChannel.class)
.option(ChannelOption.TCP_NODELAY, true)
.handler(new ChannelInitializer<SocketChannel>() {
@Override
protected void initChannel(SocketChannel ch)
throws Exception {
ch.pipeline().addLast(new TimeClientHandler());
}
});
//异步链接服务器 同步等待链接成功
ChannelFuture f = b.connect(host, port).sync();
//等待链接关闭
f.channel().closeFuture().sync();

} finally {
group.shutdownGracefully();
System.out.println("客户端优雅的释放了线程资源...");
}

}

public static void main(String[] args) throws Exception {

new TimeClient().connect(8000, "127.0.0.1");
}

}

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion>

<groupId>com.jiepu</groupId>
<artifactId>netty2</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>netty2</name>
<url>http://maven.apache.org</url>

<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>

<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.10</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>io.netty</groupId>
<artifactId>netty-all</artifactId><!-- netty-all -->
<version>5.0.0.Alpha1</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>

</plugins>
</build>
</project>