Netty之Marshalling编解码_netty 无法解析符号 'io

Netty主流的编解码器：

①JBoss的Marshalling包

②google的Protobuf

③基于Protobuf的Kyro

④Apache的Thrift

 本篇博客主要介绍Netty基于Marshalling的最简单的代码实践

实现引入依赖

<dependency>
	<groupId>io.netty</groupId>
	<artifactId>netty-all</artifactId>
	<version>4.1.12.Final</version>
</dependency>
<dependency>
	<groupId>org.jboss.marshalling</groupId>
	<artifactId>jboss-marshalling-serial</artifactId>
	<version>2.0.0.Beta2</version>
</dependency>

MarshallingCodeFactory

package com.yj.service.codec;
 
import org.jboss.marshalling.MarshallerFactory;
import org.jboss.marshalling.Marshalling;
import org.jboss.marshalling.MarshallingConfiguration;
import io.netty.handler.codec.marshalling.DefaultMarshallerProvider;
import io.netty.handler.codec.marshalling.DefaultUnmarshallerProvider;
import io.netty.handler.codec.marshalling.MarshallerProvider;
import io.netty.handler.codec.marshalling.MarshallingDecoder;
import io.netty.handler.codec.marshalling.MarshallingEncoder;
import io.netty.handler.codec.marshalling.UnmarshallerProvider;
 
public class MarshallingCodeFactory {
 
	/**
	 * 创建Marshalling解码器MarshallingDecoder
	 * 
	 * @return
	 */
	public static MarshallingDecoder buildMarshallingDecoder() {
		MarshallerFactory factory = Marshalling.getProvidedMarshallerFactory("serial");
		MarshallingConfiguration configuration = new MarshallingConfiguration();
		configuration.setVersion(5);
		UnmarshallerProvider provider = new DefaultUnmarshallerProvider(factory, configuration);
		MarshallingDecoder decoder = new MarshallingDecoder(provider);
		return decoder;
	}
 
	/**
	 * 创建MarshallingEncoder
	 * 
	 * @return
	 */
	public static MarshallingEncoder buildMarshallingEncoder() {
		// 这里表示的是支持java serial对象的序列化。所以我们传输的对象要实现Serializable接口
		MarshallerFactory factory = Marshalling.getProvidedMarshallerFactory("serial");
		MarshallingConfiguration configuration = new MarshallingConfiguration();
		configuration.setVersion(5);
		MarshallerProvider provider = new DefaultMarshallerProvider(factory, configuration);
		MarshallingEncoder encoder = new MarshallingEncoder(provider);
		return encoder;
 
	}
}

客户端，服务端分别添加编解码器

pipeline.addLast(MarshallingCodeFactory.buildMarshallingEncoder());
pipeline.addLast(MarshallingCodeFactory.buildMarshallingDecoder());

 请求，响应实体都需要实现Serializable接口进行序列化

Req，Resp

package com.yj.entity;
 
import java.io.Serializable;
import lombok.Data;
import lombok.ToString;
 
@Data
@ToString
public class Req implements Serializable {
	private static final long serialVersionUID = -1465519266979187295L;
	private String id;
	private String name;
}

package com.yj.entity;
 
import java.io.Serializable;
import lombok.Data;
import lombok.ToString;
 
@Data
@ToString
public class Resp implements Serializable{
	private static final long serialVersionUID = -1450604945238500417L;
	private String id;
    private String name;
}

客户端handler

package com.yj.service.codec;
 
import com.yj.entity.Req;
import com.yj.entity.Resp;
 
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
 
public class CodecClientHandler extends ChannelInboundHandlerAdapter {
 
	@Override
	public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
		super.exceptionCaught(ctx, cause);
	}
 
	@Override
	public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
		Resp resp = (Resp) msg;
		System.out.println("接收到服务端的响应:" + resp);
	}
 
	@Override
	public void channelActive(ChannelHandlerContext ctx) throws Exception {
		Req req = new Req();
		req.setId("1");
		req.setName("我的请求");
		ctx.writeAndFlush(req).addListener(new ChannelFutureListener() {
			public void operationComplete(ChannelFuture future) throws Exception {
				if (future.isSuccess()) {
					System.out.println("成功发送到服务端消息");
				} else {
					System.out.println("失败服务端消息失败:" + future.cause().getMessage());
					future.cause().printStackTrace();
				}
			}
		});
	}
}

服务端handler

package com.yj.service.codec;
 
import com.yj.entity.Req;
import com.yj.entity.Resp;
 
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
 
public class CodecServerHandler extends ChannelInboundHandlerAdapter {
 
	@Override
	public void channelRead(ChannelHandlerContext ctx, Object msg) {
		Req req = (Req) msg;
		System.out.println("接收到客户端的请求:" + req);
	}
 
	@Override
	public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
		Resp resp = new Resp();
		resp.setId("1");
		resp.setName("我的响应");
		ctx.writeAndFlush(resp);
	}
}

分别启动服务端，客户端，观察输出结果

客户端输出：
接收到服务端的响应:Resp(id=1, name=我的响应)
服务端输出：
接收到客户端的请求:Req(id=1, name=我的请求)

服务端，客户端的Req和Resp实体似乎要位于相同的package下，否则解析会有异常