netty: 编解码之jboss marshalling, 用marshalling进行对象传输

jboss marshalling是jboss内部的一个序列化框架，速度也十分快，这里netty也提供了支持，使用十分方便。

TCP在网络通讯的时候，通常在解决TCP粘包、拆包问题的时候，一般会用以下几种方式：

　　1、 消息定长 例如每个报文的大小固定为200个字节，如果不够，空位补空格；

　　2、 在消息尾部添加特殊字符进行分割，如添加回车；

　　3、 将消息分为消息体和消息头，在消息头里面包含表示消息长度的字段，然后进行业务逻辑的处理。

　　在Netty中我们主要利用对象的序列化进行对象的传输，虽然Java本身的序列化也能完成，但是Java序列化有很多问题，如后字节码流太大，以及序列化程度太低等。Jboss的序列化有程度较高、序列化后码流较小。这里利用Jboss的Marshalling测试一个简单的对象序列化。

引入marshalling

<!-- https://mvnrepository.com/artifact/io.netty/netty-all -->
	<dependency>
	    <groupId>io.netty</groupId>
	    <artifactId>netty-all</artifactId>
	    <version>5.0.0.Alpha2</version>
	</dependency>
	
	<!-- https://mvnrepository.com/artifact/org.jboss.marshalling/jboss-marshalling -->
	<dependency>
	    <groupId>org.jboss.marshalling</groupId>
	    <artifactId>jboss-marshalling</artifactId>
	    <version>2.0.0.CR1</version>
	</dependency>
    
    <!-- https://mvnrepository.com/artifact/org.jboss.marshalling/jboss-marshalling-serial -->
	<dependency>
	    <groupId>org.jboss.marshalling</groupId>
	    <artifactId>jboss-marshalling-serial</artifactId>
	    <version>2.0.0.CR1</version>	    
	</dependency>

　　

server:

public class Server {

	public static void main(String[] args) throws InterruptedException {
		//1.第一个线程组是用于接收Client端连接的  
        EventLoopGroup bossGroup = new NioEventLoopGroup();   
        //2.第二个线程组是用于实际的业务处理的  
        EventLoopGroup workerGroup = new NioEventLoopGroup();  
        ServerBootstrap b = new ServerBootstrap();  
        b.group(bossGroup, workerGroup);//绑定两个线程池  
        b.channel(NioServerSocketChannel.class);//指定NIO的模式，如果是客户端就是NioSocketChannel  
//        b.option(ChannelOption.SO_BACKLOG, 1024);//TCP的缓冲区设置  
//        b.option(ChannelOption.SO_SNDBUF, 32*1024);//设置发送缓冲的大小  
//        b.option(ChannelOption.SO_RCVBUF, 32*1024);//设置接收缓冲区大小  
//        b.option(ChannelOption.SO_KEEPALIVE, true);//保持连续  
        b.childHandler(new ChannelInitializer<SocketChannel>() {  
            protected void initChannel(SocketChannel ch) throws Exception {
            	//设置Marshalling的编码和解码
                ch.pipeline().addLast(MarshallingCodeCFactory.buildMarshallingDecoder());
                ch.pipeline().addLast(MarshallingCodeCFactory.buildMarshallingEncoder());
                ch.pipeline().addLast(new ServerHandler());
            }
        });
        ChannelFuture future = b.bind(8765).sync();//绑定端口  
        future.channel().closeFuture().sync();//等待关闭(程序阻塞在这里等待客户端请求)  
        bossGroup.shutdownGracefully();//关闭线程  
        workerGroup.shutdownGracefully();//关闭线程 

	}
}

　　

ServerHandler

public class ServerHandler extends ChannelHandlerAdapter{

	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发送："+send);
    	
    	Receive receive = new Receive();
    	receive.setId(send.getId());
    	receive.setMessage(send.getMessage());
    	receive.setName(send.getName());
    	ctx.writeAndFlush(receive);
    }
	
}

　　

client

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

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反馈："+receive);

    }
	
}

　　

send

public class Send implements Serializable {
	 
	/**
	 * serialVersionUID:TODO（用一句话描述这个变量表示什么）
	 * 
	 * @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

public class Receive implements Serializable{
 
	/**
	 * serialVersionUID:TODO（用一句话描述这个变量表示什么）
	 * @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) + "]";
	}
	
}

　　

marshalling工厂类

public final class MarshallingCodeCFactory {

	 /**
     * 创建Jboss Marshalling解码器MarshallingDecoder
     * @return MarshallingDecoder
     */
    public static MarshallingDecoder buildMarshallingDecoder() {
    	//首先通过Marshalling工具类的精通方法获取Marshalling实例对象 参数serial标识创建的是java序列化工厂对象。
		final MarshallerFactory marshallerFactory = Marshalling.getProvidedMarshallerFactory("serial");
		//创建了MarshallingConfiguration对象，配置了版本号为5 
		final MarshallingConfiguration configuration = new MarshallingConfiguration();
		configuration.setVersion(5);
		//根据marshallerFactory和configuration创建provider
		UnmarshallerProvider provider = new DefaultUnmarshallerProvider(marshallerFactory, configuration);
		//构建Netty的MarshallingDecoder对象，俩个参数分别为provider和单个消息序列化后的最大长度
		MarshallingDecoder decoder = new MarshallingDecoder(provider, 1024);
		return decoder;
    }

    /**
     * 创建Jboss Marshalling编码器MarshallingEncoder
     * @return MarshallingEncoder
     */
    public static MarshallingEncoder buildMarshallingEncoder() {
		final MarshallerFactory marshallerFactory = Marshalling.getProvidedMarshallerFactory("serial");
		final MarshallingConfiguration configuration = new MarshallingConfiguration();
		configuration.setVersion(5);
		MarshallerProvider provider = new DefaultMarshallerProvider(marshallerFactory, configuration);
		//构建Netty的MarshallingEncoder对象，MarshallingEncoder用于实现序列化接口的POJO对象序列化为二进制数组
		MarshallingEncoder encoder = new MarshallingEncoder(provider);
		return encoder;
    }
}

　　

运行结果

server反馈：Receive [id=1, name=name1, message=message1, sss=null]
server反馈：Receive [id=2, name=name2, message=message2, sss=null]
server反馈：Receive [id=3, name=name3, message=message3, sss=null]
server反馈：Receive [id=4, name=name4, message=message4, sss=null]
server反馈：Receive [id=5, name=name5, message=message5, sss=null]