NettyTheSniper

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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


  1. package com.itstack;
  2.  
  3. import io.netty.channel.ChannelInitializer;
  4. import io.netty.channel.socket.SocketChannel;
  5. import io.netty.handler.codec.LineBasedFrameDecoder;
  6. import io.netty.handler.codec.string.StringDecoder;
  7. import io.netty.handler.codec.string.StringEncoder;
  8.  
  9. public class ChildChannelHandler extends ChannelInitializer<SocketChannel>{
  10.  
  11. @Override
  12. protected void initChannel(SocketChannel e) throws Exception {
  13.  
  14. System.out.println("报告");
  15. 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");
  16. System.out.println("报告完毕");
  18. //基于行的半包粘包处理、String类型解码、String类型编码、消息处理
  19. e.pipeline().addLast(new LineBasedFrameDecoder(1024));
  20. e.pipeline().addLast(new StringDecoder());
  21. e.pipeline().addLast(new StringEncoder());
  22. e.pipeline().addLast(new MyClientHanlder());
  24. }
  25.  
  26. }



MyClientHanlder.java


  1. package com.itstack;
  2.  
  3. import java.util.Date;
  4.  
  5. import io.netty.channel.ChannelHandlerAdapter;
  6. import io.netty.channel.ChannelHandlerContext;
  7.  
  8. public class MyClientHanlder extends ChannelHandlerAdapter {
  9.  
  10. /*
  11. * channelAction
  12. *
  13. * channel 通道
  14. * action 活跃的
  15. *
  16. * 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
  17. *
  18. */
  19. public void channelActive(ChannelHandlerContext ctx) throws Exception {
  21. System.out.println("客户端与服务端通道-开启："+ctx.channel().localAddress()+"channelActive");
  23. }
  24.  
  25. /*
  26. * channelInactive
  27. *
  28. * channel 通道
  29. * Inactive 不活跃的
  30. *
  31. * 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
  32. *
  33. */
  34. public void channelInactive(ChannelHandlerContext ctx) throws Exception {
  36. System.out.println("客户端与服务端通道-关闭："+ctx.channel().localAddress()+"channelInactive");
  38. }
  39.  
  40. /*
  41. * channelRead
  42. *
  43. * channel 通道
  44. * Read 读
  45. *
  46. * 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
  47. * 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
  48. *
  49. */
  50. public void channelRead(ChannelHandlerContext ctx, Object msg)
  51. throws Exception {
  53. //注意此处已经不需要手工解码了
  54. System.out.println(ctx.channel().id()+""+new Date()+" "+msg);
  56. //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]
  57. //String str = "服务端收到："+ctx.channel().id()+new Date()+" "+msg+"\r\n";
  59. //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]
  60. String str = (String) msg+"\r\n";
  62. //发送给服务端
  63. ctx.writeAndFlush(str);
  64. }
  65.  
  66. /*
  67. * channelReadComplete
  68. *
  69. * channel 通道
  70. * Read 读取
  71. * Complete 完成
  72. *
  73. * 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
  74. * ctx.flush()
  75. *
  76. */
  77. public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
  78. ctx.flush();
  79. }
  80.  
  81. /*
  82. * exceptionCaught
  83. *
  84. * exception 异常
  85. * Caught 抓住
  86. *
  87. * 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
  88. *
  89. */
  90. public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause)
  91. throws Exception {
  92. ctx.close();
  93. System.out.println("异常退出:"+cause.getMessage());
  94. }
  95.  
  96. }



NettyClient.java


  1. package com.itstack;
  2.  
  3. import io.netty.bootstrap.Bootstrap;
  4. import io.netty.channel.ChannelFuture;
  5. import io.netty.channel.ChannelOption;
  6. import io.netty.channel.EventLoopGroup;
  7. import io.netty.channel.nio.NioEventLoopGroup;
  8. import io.netty.channel.socket.nio.NioSocketChannel;
  9.  
  10. public class NettyClient {
  11.  
  12. public static void main(String[] args) {
  13. try {
  14. new NettyClient().connect("192.168.30.223", 7397);
  15. } catch (Exception e) {
  16. e.printStackTrace();
  17. }
  18. }
  20. public void connect(String inetHost,int inetPort) throws Exception{
  22. EventLoopGroup group = new NioEventLoopGroup();
  24. try {
  25.  
  26. Bootstrap b = new Bootstrap();
  28. b.group(group); //group 组
  29. b.channel(NioSocketChannel.class); //channel 通道
  30. b.option(ChannelOption.TCP_NODELAY, true); //option 选项
  31. b.handler(new ChildChannelHandler()); //handler 处理
  33. //发起异步链接
  34. ChannelFuture f = b.connect(inetHost, inetPort);
  36. //等待客户端链路关闭
  37. f.channel().closeFuture().sync();
  39. } finally{
  40. group.shutdownGracefully();
  41. }
  43. }
  45. }




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
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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(175)  评论(0)  编辑  收藏  举报