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Netty學(xué)習(xí)教程之Netty與Marshalling結(jié)合發(fā)送對象

發(fā)布時間：2020-08-24 23:48:51 來源：腳本之家 閱讀：123 作者：荒野的塵埃 欄目：編程語言

前言

之前的一篇文章是Netty簡單的學(xué)習(xí)，我們可以傳遞一個字符串，那么如果我們想要在Netty中傳遞一個對象該怎么辦呢 ？

那么這個時候我們可以結(jié)合Marshalling來傳遞。

方法如下：

首先需要導(dǎo)入兩個Marshalling的依賴包

jboss-marshalling-1.3.0.CR9.jar
jboss-marshalling-serial-1.3.0.CR9.jar

注意：我開始學(xué)習(xí)的時候只導(dǎo)入了第一個jar包，沒有導(dǎo)入第二個，結(jié)果是不報錯，但是客戶端和服務(wù)端之間傳遞不了消息。所以兩個包一定要都導(dǎo)入才行。

MarshallingCodeCFactory工具類

public class MarshallingCodeCFactory { 
 
 public static MarshallingDecoder buildMarshallingDecoder() { 
  final MarshallerFactory factory = Marshalling.getProvidedMarshallerFactory("serial"); 
  final MarshallingConfiguration configuration = new MarshallingConfiguration(); 
  configuration.setVersion(5); 
  UnmarshallerProvider provider = new DefaultUnmarshallerProvider(factory, configuration); 
  MarshallingDecoder decoder = new MarshallingDecoder(provider, 1024*1024); 
  return decoder; 
 } 
 
 public static MarshallingEncoder buildMarshallingEncoder() { 
  final MarshallerFactory factory = Marshalling.getProvidedMarshallerFactory("serial"); 
  final MarshallingConfiguration configuration = new MarshallingConfiguration(); 
  configuration.setVersion(5); 
  MarshallerProvider provider = new DefaultMarshallerProvider(factory, configuration); 
  MarshallingEncoder encoder = new MarshallingEncoder(provider); 
  return encoder; 
 } 
}

server端

public class Server { 
  
 public static void main(String[] args) throws InterruptedException { 
  //1.第一個線程組是用于接收Client端連接的 
  EventLoopGroup bossGroup = new NioEventLoopGroup();  
  //2.第二個線程組是用于實際的業(yè)務(wù)處理的 
  EventLoopGroup workerGroup = new NioEventLoopGroup(); 
  ServerBootstrap b = new ServerBootstrap(); 
  b.group(bossGroup, workerGroup);//綁定兩個線程池 
  b.channel(NioServerSocketChannel.class);//指定NIO的模式，如果是客戶端就是NioSocketChannel 
  b.option(ChannelOption.SO_BACKLOG, 1024);//TCP的緩沖區(qū)設(shè)置 
  b.option(ChannelOption.SO_SNDBUF, 32*1024);//設(shè)置發(fā)送緩沖的大小 
  b.option(ChannelOption.SO_RCVBUF, 32*1024);//設(shè)置接收緩沖區(qū)大小 
  b.option(ChannelOption.SO_KEEPALIVE, true);//保持連續(xù) 
  b.childHandler(new ChannelInitializer<SocketChannel>() { 
   protected void initChannel(SocketChannel ch) throws Exception { 
    //設(shè)置Marshalling的編碼和解碼 
    ch.pipeline().addLast(MarshallingCodeCFactory.buildMarshallingDecoder()); 
    ch.pipeline().addLast(MarshallingCodeCFactory.buildMarshallingEncoder()); 
    ch.pipeline().addLast(new ServertHandler()); 
   } 
  }); 
  ChannelFuture future = b.bind(8765).sync();//綁定端口 
  future.channel().closeFuture().sync();//等待關(guān)閉(程序阻塞在這里等待客戶端請求) 
  bossGroup.shutdownGracefully();//關(guān)閉線程 
  workerGroup.shutdownGracefully();//關(guān)閉線程 
 } 
 
}

ServerHandler處理類

public class ServertHandler extends ChannelHandlerAdapter { 
 
 @Override 
 public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) 
   throws Exception { 
  cause.printStackTrace(); 
 } 
 
 @Override 
 public void channelRead(ChannelHandlerContext ctx, Object msg) 
   throws Exception { 
  Send send = (Send) msg; 
  System.out.println("client發(fā)送："+send); 
   
  Receive receive = new Receive(); 
  receive.setId(send.getId()); 
  receive.setMessage(send.getMessage()); 
  receive.setName(send.getName()); 
  ctx.writeAndFlush(receive); 
 } 
  
}

由于我們已經(jīng)在Server端和Client端定義了傳遞的類型又Marshalling工廠處理，所以此時我們接收的時候直接轉(zhuǎn)成發(fā)送的對象類型就行了。

Client端

public class Client { 
 
 public static void main(String[] args) throws InterruptedException { 
  EventLoopGroup worker = new NioEventLoopGroup(); 
  Bootstrap b = new Bootstrap(); 
  b.group(worker) 
  .channel(NioSocketChannel.class) 
  .handler(new ChannelInitializer<SocketChannel>() { 
   @Override 
   protected void initChannel(SocketChannel sc) throws Exception { 
    //ByteBuf buf = Unpooled.copiedBuffer("$_".getBytes()); 
    //sc.pipeline().addLast(new DelimiterBasedFrameDecoder(1024,buf)); 
    //sc.pipeline().addLast(new StringDecoder()); 
    sc.pipeline().addLast(MarshallingCodeCFactory.buildMarshallingDecoder()); 
    sc.pipeline().addLast(MarshallingCodeCFactory.buildMarshallingEncoder()); 
    sc.pipeline().addLast(new ClientHandler()); 
   } 
  }); 
  ChannelFuture f=b.connect("127.0.0.1",8765).sync(); 
  for(int i=1;i<=5;i++){ 
   Send send = new Send(); 
   send.setId(i); 
   send.setMessage("message"+i); 
   send.setName("name"+i); 
   f.channel().writeAndFlush(send); 
  } 
  f.channel().closeFuture().sync(); 
  worker.shutdownGracefully(); 
 } 
}

ClientHandler端

public class ClientHandler extends ChannelHandlerAdapter{ 
  @Override 
  public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) 
    throws Exception { 
   cause.printStackTrace(); 
   ctx.close(); 
  } 
 
  @Override 
  public void channelRead(ChannelHandlerContext ctx, Object msg) 
    throws Exception { 
   Receive receive = (Receive) msg; 
   System.out.println("server反饋："+receive); 
  } 
}

send類

public class Send implements Serializable { 
 
 /** 
  * serialVersionUID:TODO（用一句話描述這個變量表示什么） 
  * 
  * @since 1.0.0 
  */ 
 
 private static final long serialVersionUID = 1L; 
 
 private Integer id; 
 private String name; 
 private String message; 
 
 public Integer getId() { 
  return id; 
 } 
 
 public void setId(Integer id) { 
  this.id = id; 
 } 
 
 public String getName() { 
  return name; 
 } 
 
 public void setName(String name) { 
  this.name = name; 
 } 
 
 public String getMessage() { 
  return message; 
 } 
 
 public void setMessage(String message) { 
  this.message = message; 
 } 
 
 @Override 
 public String toString() { 
  return "Send [id=" + id + ", name=" + name + ", message=" + message + "]"; 
 } 
 
}

Receive類

public class Receive implements Serializable{ 
 
 /** 
  * serialVersionUID:TODO（用一句話描述這個變量表示什么） 
  * @since 1.0.0 
  */ 
  
 private static final long serialVersionUID = 1L; 
 private Integer id; 
 private String name; 
 private String message; 
 private byte[] sss; 
  
 public byte[] getSss() { 
  return sss; 
 } 
 public void setSss(byte[] sss) { 
  this.sss = sss; 
 } 
 public Integer getId() { 
  return id; 
 } 
 public void setId(Integer id) { 
  this.id = id; 
 } 
 public String getName() { 
  return name; 
 } 
 public void setName(String name) { 
  this.name = name; 
 } 
 public String getMessage() { 
  return message; 
 } 
 public void setMessage(String message) { 
  this.message = message; 
 } 
 @Override 
 public String toString() { 
  return "Receive [id=" + id + ", name=" + name + ", message=" + message + ", sss=" + Arrays.toString(sss) + "]"; 
 } 
  
}

注意：send類和receive這兩個類，我們再真實環(huán)境開發(fā)的時候服務(wù)器和客戶端往往是兩個web應(yīng)用程序，在這里我們要注意服務(wù)端和客戶端之間的兩個類類名和包名在兩端要完全相同。

總結(jié)

以上就是這篇文章的全部內(nèi)容了，希望本文的內(nèi)容對大家的學(xué)習(xí)或者工作能帶來一定的幫助，如果有疑問大家可以留言交流，謝謝大家對億速云的支持。

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