基于Netty5.0入门案例八之NettyClient[半包粘包处理,编码解码处理,收发数据]
前言介绍:
之前在NettyServer案例的一到六中,已经潜移默化的介绍了相关的应用。为此在客户端这里我们直接使用了所有上述的劳动成果。
欢迎加入:itstack | Netty The Sniper 5360692
环境需求:
1、jdk1.7以上【jdk1.7以下只能部分支持netty】
2、Netty-all-5.0【netty3.x 4.x 5每次的变化较大,接口类名也随着变化】
3、telnet 测试【可以现在你的win7机器上测试这个命令,用于链接到服务端的测试命令】【本案例中已经很不好满足测试需求了】
4、最好下载个网络调试助手,它能帮助你测试服务端、客户端
代码部分:
======================
TestNettyClientBaseDemo
src
com.itstack
ChildChannelHandler.java
MyClientHanlder.java
NettyClient.java
======================
ChildChannelHandler.java
- package com.itstack;
- import io.netty.channel.ChannelInitializer;
- import io.netty.channel.socket.SocketChannel;
- import io.netty.handler.codec.LineBasedFrameDecoder;
- import io.netty.handler.codec.string.StringDecoder;
- import io.netty.handler.codec.string.StringEncoder;
- public class ChildChannelHandler extends ChannelInitializer<SocketChannel>{
- @Override
- protected void initChannel(SocketChannel e) throws Exception {
- System.out.println("报告");
- System.out.println("信息:客户端与服务端建立通道链接,下面开始加载管道信息处理");
- System.out.println("报告完毕");
- //基于行的半包粘包处理、String类型解码、String类型编码、消息处理
- e.pipeline().addLast(new LineBasedFrameDecoder(1024));
- e.pipeline().addLast(new StringDecoder());
- e.pipeline().addLast(new StringEncoder());
- e.pipeline().addLast(new MyClientHanlder());
- }
- }
MyClientHanlder.java
- package com.itstack;
- import java.util.Date;
- import io.netty.channel.ChannelHandlerAdapter;
- import io.netty.channel.ChannelHandlerContext;
- public class MyClientHanlder extends ChannelHandlerAdapter {
- /*
- * channelAction
- *
- * channel 通道
- * action 活跃的
- *
- * 当客户端主动链接服务端的链接后,这个通道就是活跃的了。也就是客户端与服务端建立了通信通道并且可以传输数据
- *
- */
- public void channelActive(ChannelHandlerContext ctx) throws Exception {
- System.out.println("客户端与服务端通道-开启:"+ctx.channel().localAddress()+"channelActive");
- }
- /*
- * channelInactive
- *
- * channel 通道
- * Inactive 不活跃的
- *
- * 当客户端主动断开服务端的链接后,这个通道就是不活跃的。也就是说客户端与服务端的关闭了通信通道并且不可以传输数据
- *
- */
- public void channelInactive(ChannelHandlerContext ctx) throws Exception {
- System.out.println("客户端与服务端通道-关闭:"+ctx.channel().localAddress()+"channelInactive");
- }
- /*
- * channelRead
- *
- * channel 通道
- * Read 读
- *
- * 简而言之就是从通道中读取数据,也就是服务端接收客户端发来的数据
- * 但是这个数据在不进行解码时它是ByteBuf类型的后面例子我们在介绍
- *
- */
- public void channelRead(ChannelHandlerContext ctx, Object msg)
- throws Exception {
- //注意此处已经不需要手工解码了
- System.out.println(ctx.channel().id()+""+new Date()+" "+msg);
- //通知您已经链接上客户端[给客户端穿回去的数据加个换行]
- //String str = "服务端收到:"+ctx.channel().id()+new Date()+" "+msg+"\r\n";
- //通知您已经链接上客户端[给客户端穿回去的数据加个换行][能用于测试发送量与接受量,在网络调试助手下可以观察到]
- String str = (String) msg+"\r\n";
- //发送给服务端
- ctx.writeAndFlush(str);
- }
- /*
- * channelReadComplete
- *
- * channel 通道
- * Read 读取
- * Complete 完成
- *
- * 在通道读取完成后会在这个方法里通知,对应可以做刷新操作
- * ctx.flush()
- *
- */
- public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
- ctx.flush();
- }
- /*
- * exceptionCaught
- *
- * exception 异常
- * Caught 抓住
- *
- * 抓住异常,当发生异常的时候,可以做一些相应的处理,比如打印日志、关闭链接
- *
- */
- public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause)
- throws Exception {
- ctx.close();
- System.out.println("异常退出:"+cause.getMessage());
- }
- }
NettyClient.java
- package com.itstack;
- import io.netty.bootstrap.Bootstrap;
- import io.netty.channel.ChannelFuture;
- import io.netty.channel.ChannelOption;
- import io.netty.channel.EventLoopGroup;
- import io.netty.channel.nio.NioEventLoopGroup;
- import io.netty.channel.socket.nio.NioSocketChannel;
- public class NettyClient {
- public static void main(String[] args) {
- try {
- new NettyClient().connect("192.168.30.223", 7397);
- } catch (Exception e) {
- e.printStackTrace();
- }
- }
- public void connect(String inetHost,int inetPort) throws Exception{
- EventLoopGroup group = new NioEventLoopGroup();
- try {
- Bootstrap b = new Bootstrap();
- b.group(group); //group 组
- b.channel(NioSocketChannel.class); //channel 通道
- b.option(ChannelOption.TCP_NODELAY, true); //option 选项
- b.handler(new ChildChannelHandler()); //handler 处理
- //发起异步链接
- ChannelFuture f = b.connect(inetHost, inetPort);
- //等待客户端链路关闭
- f.channel().closeFuture().sync();
- } finally{
- group.shutdownGracefully();
- }
- }
- }
1、启动网络调试助手模拟软件,开启一个服务端
2、启动NettyClient
3、控制台输出[客户端]
----------------------------------------------
报告
信息:客户端与服务端建立通道链接,下面开始加载管道信息处理
报告完毕
客户端与服务端通道-开启:/192.168.30.223:54629channelActive
611dba59Wed Dec 31 11:09:44 CST 2014 http://www.itstack.org
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客户端与服务端通道-关闭:/192.168.30.223:54629channelInactive
posted on 2015-01-12 17:08 bugstack虫洞栈 阅读(176) 评论(0) 编辑 收藏 举报