Netty之编码解码技术(四)
转：https://blog.****.net/qq_18603599/article/details/80768403
上一章介绍了netty编程中经常遇到的TCP的粘包和拆包的问题以及解决方案,今天介绍netty基于网络通信的编解码知识,主要有以下知识点.
1 编码器
2 解码器
3 netty自带的编解码器
4 代码实例演示常用的编解码器
5 自定义编解码器
首先接单介绍一下,序列化和反序列化大概念,在网络传输通信中,会发生两种数据转换的操作,一种是把消息对象转换成字节码,这种是序列化,还有一种是要把字节码对象再转换成消息对象,称为反序列化.和netty的对应关系,序列化对应的是编码过程,反序列化对应的解码过程,当然这种框架有很多,比如Kryo,json,protobuf等,今天主要学习一下netty里面的实现.下面就分开来说.
Encoder:编码器
& 消息对象编码成消息对象:MessageToMessageEncoder,netty的实现子类有如下所示:
Base64Encoder,ProtobufEncoder,RedisEncoder,StringEncoder
& 消息对象编码成字节MessageToByteEncoder,netty的实现子类如下所示:
MarshallingEncoder,ObjectEncoder
Decoder:解码器
& 解码字节到消息:ByteToMessageDecoder,对应的netty子类如下所示
DelimiterBasedFrameDecoder,FixedLengthFrameDecoder,LengthFieldBasedFrameDecoder,LineBasedFrameDecoder,RedisDecoder
& 解码消息到消息:MessageToMessageDecoder:对应的netty子类如下所示
Base64Decoder,ProtobufDecoder,StringDecoder
总结类关系
Encoder实际继承与ChannelOutboundHandlerAdapter,Decoder实际继承与ChannelInboundHandlerAdapter,后者其实都是继承与ChannelHandlerAdapter.上面的理论知识就介绍完了,下面直接通过代码演示一些常用的编解码器是如何使用的,分类讲解
使用Jboss Marshalling来实现编解码功能：模拟请求和响应之间的关系
首先看一下代码结构:
接下来分析每个类的代码,首先完成Jboss的编解码工厂实现,主要有两个方法,一个是解码,一个是编码
package encoder_decoder.masharlling;
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;
import org.jboss.marshalling.MarshallerFactory;
import org.jboss.marshalling.Marshalling;
import org.jboss.marshalling.MarshallingConfiguration;
/**
* @ 创建人 贾红平
* @ 创建时间 2018/6/24
* @ 功能描述 调用jboss marshalling实现对象的编码和解码功能
*/
public class MarshallingCodeCFactory {
/**
* 创建Jboss Marshalling解码器MarshallingDecoder
*
* @return
*/
public static MarshallingDecoder buildMarshallingDecoder() {
final MarshallerFactory marshallerFactory = Marshalling.getProvidedMarshallerFactory("serial");
final MarshallingConfiguration configuration = new MarshallingConfiguration();
configuration.setVersion(5);
//解码提供者
UnmarshallerProvider provider = new DefaultUnmarshallerProvider(marshallerFactory, configuration);
//获取一个解码器
MarshallingDecoder decoder = new MarshallingDecoder(provider, 1024);
return decoder;
}
/**
* 创建Jboss Marshalling编码器MarshallingEncoder
*
* @return
*/
public static MarshallingEncoder buildMarshallingEncoder() {
final MarshallerFactory marshallerFactory = Marshalling.getProvidedMarshallerFactory("serial");
final MarshallingConfiguration configuration = new MarshallingConfiguration();
configuration.setVersion(5);
//编码提供者
MarshallerProvider provider = new DefaultMarshallerProvider(marshallerFactory, configuration);
//获取一个编码器
MarshallingEncoder encoder = new MarshallingEncoder(provider);
return encoder;
}
}
定义两个JavaBean用来存储用户的请求和响应实体信息:如下所示
package pojo;
import java.io.Serializable;
/**
* @ 创建人 贾红平
* @ 创建时间 2018/6/24
* @ 功能描述 保存请求参数
*/
public class RequestBean implements Serializable {
/**
* 默认的***ID
*/
private static final long serialVersionUID = 1L;
private int subReqID;
private String userName;
private String productName;
private String phoneNumber;
private String address;
/**
* @return the subReqID
*/
public final int getSubReqID() {
return subReqID;
}
/**
* @param subReqID
* the subReqID to set
*/
public final void setSubReqID(int subReqID) {
this.subReqID = subReqID;
}
/**
* @return the userName
*/
public final String getUserName() {
return userName;
}
/**
* @param userName
* the userName to set
*/
public final void setUserName(String userName) {
this.userName = userName;
}
/**
* @return the productName
*/
public final String getProductName() {
return productName;
}
/**
* @param productName
* the productName to set
*/
public final void setProductName(String productName) {
this.productName = productName;
}
/**
* @return the phoneNumber
*/
public final String getPhoneNumber() {
return phoneNumber;
}
/**
* @param phoneNumber
* the phoneNumber to set
*/
public final void setPhoneNumber(String phoneNumber) {
this.phoneNumber = phoneNumber;
}
/**
* @return the address
*/
public final String getAddress() {
return address;
}
/**
* @param address
* the address to set
*/
public final void setAddress(String address) {
this.address = address;
}
@Override
public String toString() {
return "RequestBean [subReqID=" + subReqID + ", userName=" + userName
+ ", productName=" + productName + ", phoneNumber="
+ phoneNumber + ", address=" + address + "]";
}
}
保存响应信息:
package pojo;
import java.io.Serializable;
/**
* @ 创建人 贾红平
* @ 创建时间 2018/6/24
* @ 功能描述 保存响应参数
*/
public class ResponseBean implements Serializable {
/**
* 默认序列ID
*/
private static final long serialVersionUID = 1L;
private int subReqID;
private int respCode;
private String desc;
/**
* @return the subReqID
*/
public final int getSubReqID() {
return subReqID;
}
/**
* @param subReqID
* the subReqID to set
*/
public final void setSubReqID(int subReqID) {
this.subReqID = subReqID;
}
/**
* @return the respCode
*/
public final int getRespCode() {
return respCode;
}
/**
* @param respCode
* the respCode to set
*/
public final void setRespCode(int respCode) {
this.respCode = respCode;
}
/**
* @return the desc
*/
public final String getDesc() {
return desc;
}
/**
* @param desc
* the desc to set
*/
public final void setDesc(String desc) {
this.desc = desc;
}
@Override
public String toString() {
return "ResponseBean [subReqID=" + subReqID + ", respCode=" + respCode
+ ", desc=" + desc + "]";
}
}
定义业务处理的handler,循环向服务端发送请求对象信息,使用编码器来编码对象消息成字节码,同时获取服务端响应的信息,使用解码器来获取结果.
package encoder_decoder.masharlling.client;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import pojo.RequestBean;
import java.util.Random;
/**
* @ 创建人 贾红平
* @ 创建时间 2018/6/24
* @ 功能描述 client handler
*/
public class RequestClientHandler extends ChannelInboundHandlerAdapter{
/**
* 客户端连接上服务端之后会调用此方法
* @param ctx
* @throws Exception
*/
@Override
public void channelActive(ChannelHandlerContext ctx) throws Exception {
for (int i = 0; i <5 ; i++) {
System.out.println("Client really send data to Server:"+generatorRequestBean(i));
ctx.writeAndFlush(generatorRequestBean(i));
}
}
/**
* 构建要发送给服务端的数据
* @param i
* @return
*/
private RequestBean generatorRequestBean(int i){
String[] unames ={"jhp","bruce","lyb"};
RequestBean req = new RequestBean();
req.setAddress("南京市浦口区天润城2街区47栋1单元");
req.setPhoneNumber("13803456728");
req.setProductName("人工只能AI实践");
req.setSubReqID(i);
req.setUserName(unames[new Random().nextInt(3)]);
return req;
}
/**
* 客户端读取服务端写入的数据
* @param ctx
* @param msg
* @throws Exception
*/
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
System.out.println();
System.out.println("Receive server response : [" + msg + "]");
}
/**
* 连接或者发送读取数据出现异常
* @param ctx
* @param cause
* @throws Exception
*/
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
super.exceptionCaught(ctx, cause);
}
}
使用客户端发送请求
package encoder_decoder.masharlling.client;
import encoder_decoder.masharlling.MarshallingCodeCFactory;
import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.codec.string.StringEncoder;
/**
* @ 创建人 贾红平
* @ 创建时间 2018/6/24
* @ 功能描述 客户端
*/
public class RequestClient {
public void connect(int port, String host) throws Exception {
// 配置客户端NIO线程组
EventLoopGroup group = new NioEventLoopGroup();
try {
Bootstrap b = new Bootstrap();
b.group(group).channel(NioSocketChannel.class)
.option(ChannelOption.TCP_NODELAY, true)
.handler(new ChannelInitializer<SocketChannel>() {
@Override
public void initChannel(SocketChannel ch) throws Exception {
//添加jboss的解码器
ch.pipeline().addLast(MarshallingCodeCFactory.buildMarshallingDecoder());
//添加Jboss的编码器
ch.pipeline().addLast(MarshallingCodeCFactory.buildMarshallingEncoder());
ch.pipeline().addLast(new RequestClientHandler());
}
});
// 发起异步连接操作
ChannelFuture f = b.connect(host, port).sync();
// 当代客户端链路关闭
f.channel().closeFuture().sync();
} finally {
// 优雅退出，释放NIO线程组
group.shutdownGracefully();
}
}
/**
* @param args
* @throws Exception
*/
public static void main(String[] args) throws Exception {
int port = 8080;
if (args != null && args.length > 0) {
try {
port = Integer.valueOf(args[0]);
} catch (NumberFormatException e) {
}
}
new RequestClient().connect(port, "127.0.0.1");
}
}
编写服务端处理的handler,接受客户端的数据,并写回数据给客户端
package encoder_decoder.masharlling.server;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import pojo.RequestBean;
import pojo.ResponseBean;
/**
* @ 创建人 贾红平
* @ 创建时间 2018/6/24
* @ 功能描述 服务端处理业务的handler
*/
public class RequestServerHandler extends ChannelInboundHandlerAdapter {
/**
* 服务端连接到客户端戳发该函数调用
* @param ctx
* @throws Exception
*/
@Override
public void channelActive(ChannelHandlerContext ctx) throws Exception {
System.out.println("服务端连接到客户度:"+ctx.channel().remoteAddress());
}
/**
* 服务端接收客户端的数据 并处理完之后写入处理结果给客户端
* @param ctx
* @param msg
* @throws Exception
*/
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
RequestBean requestBean = (RequestBean)msg;
if (requestBean.getUserName().equals("jhp")){
System.out.println("Service accept client subscrib req : ["
+ requestBean.toString() + "]");
ctx.writeAndFlush(genertorResponseBean(requestBean.getSubReqID()));
}
}
/**
* 构建响应信息
* @param id
* @return
*/
private ResponseBean genertorResponseBean(int id){
ResponseBean resp = new ResponseBean();
resp.setSubReqID(id);
resp.setRespCode(0);
resp.setDesc("这本书籍是介绍和ai相关的实践项目集合");
return resp;
}
/**
* 发生异常 打印信息 关闭所有链路
* @param ctx
* @param cause
* @throws Exception
*/
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
cause.printStackTrace();
ctx.close();
}
}
再看服务端监听客户端并处理:
package encoder_decoder.masharlling.server;
import encoder_decoder.masharlling.MarshallingCodeCFactory;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.codec.string.StringEncoder;
import io.netty.handler.logging.LogLevel;
import io.netty.handler.logging.LoggingHandler;
/**
* @ 创建人 贾红平
* @ 创建时间 2018/6/24
* @ 功能描述 服务端
*/
public class RequestServer {
/**
* 绑定端口号 进行业务处理
* @param port
* @throws Exception
*/
public void bind(int port) throws Exception {
// 配置服务端的NIO线程组
EventLoopGroup bossGroup = new NioEventLoopGroup();
EventLoopGroup workerGroup = new NioEventLoopGroup();
try {
ServerBootstrap b = new ServerBootstrap();
b.group(bossGroup, workerGroup)
.channel(NioServerSocketChannel.class)
.option(ChannelOption.SO_BACKLOG, 100)
.handler(new LoggingHandler(LogLevel.INFO))
.childHandler(new ChannelInitializer<SocketChannel>() {
@Override
public void initChannel(SocketChannel ch) {
ch.pipeline().addLast(MarshallingCodeCFactory.buildMarshallingDecoder());
ch.pipeline().addLast(MarshallingCodeCFactory.buildMarshallingEncoder());
//ch.pipeline().addLast(new StringEncoder());
//ch.pipeline().addLast(new StringDecoder());
ch.pipeline().addLast(new RequestServerHandler());
}
});
// 绑定端口，同步等待成功
ChannelFuture f = b.bind(port).sync();
// 等待服务端监听端口关闭
f.channel().closeFuture().sync();
} finally {
// 优雅退出，释放线程池资源
bossGroup.shutdownGracefully();
workerGroup.shutdownGracefully();
}
}
public static void main(String[] args) throws Exception {
int port = 8080;
if (args != null && args.length > 0) {
try {
port = Integer.valueOf(args[0]);
} catch (NumberFormatException e) {
// 采用默认值
}
}
new RequestServer().bind(port);
}
}
ok,看一下最终的效果:
服务端的效果:
客户端的效果:
请求和响应完全是OK,且内容也是正确的,代表编解码使用的没有问题。接下来在看第二种编解码使用
基于ObjectEncoder和ObjectDecoder的使用:
看一下代码结构:
因为很多内容都是一样的,这里就直接上代码并把有区别的地方用红色标注出来,其它就不多说了,首先看客户端的功能:
package encoder_decoder.searizable.client;
import io.netty.channel.ChannelHandlerAdapter;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import pojo.RequestBean;
/**
* @author jiahp
* @function 处理序列化的IO线程
*/
public class SeariazableClientHandler extends ChannelInboundHandlerAdapter {
public SeariazableClientHandler() {
}
public void channelActive(ChannelHandlerContext ctx) {
for (int i = 0; i < 4; i++) {
ctx.writeAndFlush(subReq(i));
}
}
private RequestBean subReq(int i) {
RequestBean req = new RequestBean();
req.setAddress("南京市雨花台区软件大道101号华为基地");
req.setPhoneNumber("138xxxxxxxxx");
req.setProductName("Netty 最佳实践和原理分析");
req.setSubReqID(i);
req.setUserName("JHP");
return req;
}
public void channelRead(ChannelHandlerContext ctx, Object msg)
throws Exception {
System.out.println("Receive server response : [" + msg + "]");
}
public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
ctx.flush();
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
cause.printStackTrace();
ctx.close();
}
}
客户端代码:
package encoder_decoder.searizable.client;
import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.serialization.ClassResolvers;
import io.netty.handler.codec.serialization.ObjectDecoder;
import io.netty.handler.codec.serialization.ObjectEncoder;
/**
* 处理client
* @author jiahp
*/
public class SearizableClient {
public void connect(int port, String host) throws Exception {
// 配置客户端NIO线程组
EventLoopGroup group = new NioEventLoopGroup();
try {
Bootstrap b = new Bootstrap();
b.group(group).channel(NioSocketChannel.class)
.option(ChannelOption.TCP_NODELAY, true)
.handler(new ChannelInitializer<SocketChannel>() {
@Override
public void initChannel(SocketChannel ch)
throws Exception {
//netty自带的解码实现
ch.pipeline().addLast(new ObjectDecoder(1024, ClassResolvers.cacheDisabled(this.getClass().getClassLoader())));
//netty自带的编码实现
ch.pipeline().addLast(new ObjectEncoder());
ch.pipeline().addLast(new SeariazableClientHandler());
}
});
// 发起异步连接操作
ChannelFuture f = b.connect(host, port).sync();
// 当代客户端链路关闭
f.channel().closeFuture().sync();
} finally {
// 优雅退出，释放NIO线程组
group.shutdownGracefully();
}
}
/**
* @param args
* @throws Exception
*/
public static void main(String[] args) throws Exception {
int port = 8080;
if (args != null && args.length > 0) {
try {
port = Integer.valueOf(args[0]);
} catch (NumberFormatException e) {
// 采用默认值
}
}
new SearizableClient().connect(port, "127.0.0.1");
}
}
再看服务端相关的:
package encoder_decoder.searizable.server;
import io.netty.channel.ChannelHandler.Sharable;
import io.netty.channel.ChannelHandlerAdapter;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import pojo.RequestBean;
import pojo.ResponseBean;
/**
* @author jiahp
* @function 处理服务端的IO线程
*/
@Sharable
public class SeariableServerHandler extends ChannelInboundHandlerAdapter {
public void channelRead(ChannelHandlerContext ctx, Object msg)
throws Exception {
RequestBean req = (RequestBean) msg;
if ("JHP".equalsIgnoreCase(req.getUserName())) {
System.out.println("Service accept client subscrib req : ["
+ req.toString() + "]");
ctx.writeAndFlush(resp(req.getSubReqID()));
}
}
private ResponseBean resp(int subReqID) {
ResponseBean resp = new ResponseBean();
resp.setSubReqID(subReqID);
resp.setRespCode(0);
resp.setDesc("Netty book order succeed, 3 days later, sent to the designated address");
return resp;
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
cause.printStackTrace();
ctx.close();
}
}
服务器端:
package encoder_decoder.searizable.server;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.serialization.ClassResolvers;
import io.netty.handler.codec.serialization.ObjectDecoder;
import io.netty.handler.codec.serialization.ObjectEncoder;
import io.netty.handler.logging.LogLevel;
import io.netty.handler.logging.LoggingHandler;
/**
* @author jiahp
* @function 处理服务端
*/
public class SeariableServer {
public void bind(int port) throws Exception {
// 配置服务端的NIO线程组
EventLoopGroup bossGroup = new NioEventLoopGroup();
EventLoopGroup workerGroup = new NioEventLoopGroup();
try {
ServerBootstrap b = new ServerBootstrap();
b.group(bossGroup, workerGroup)
.channel(NioServerSocketChannel.class)
.option(ChannelOption.SO_BACKLOG, 100)
.handler(new LoggingHandler(LogLevel.INFO))
.childHandler(new ChannelInitializer<SocketChannel>() {
@Override
public void initChannel(SocketChannel ch) {
//netty自带的解码实现
ch.pipeline().addLast(new ObjectDecoder(1024 * 1024, ClassResolvers.weakCachingConcurrentResolver(this.getClass().getClassLoader())));
//netty自带的编码实现
ch.pipeline().addLast(new ObjectEncoder());
ch.pipeline().addLast(new SeariableServerHandler());
}
});
// 绑定端口，同步等待成功
ChannelFuture f = b.bind(port).sync();
// 等待服务端监听端口关闭
f.channel().closeFuture().sync();
} finally {
// 优雅退出，释放线程池资源
bossGroup.shutdownGracefully();
workerGroup.shutdownGracefully();
}
}
public static void main(String[] args) throws Exception {
int port = 8080;
if (args != null && args.length > 0) {
try {
port = Integer.valueOf(args[0]);
} catch (NumberFormatException e) {
// 采用默认值
}
}
new SeariableServer().bind(port);
}
}
OK，代码写完了 看一下效果如何:
客户端接受服务端返回的效果:
服务端接受客户端的数据并解析,写入结果:
第二种常用的也说完了,接下里要介绍的是第三种,很多大数据框架也用到了,比如hbase,hadoop等都会用到,就是
基于google protobuf的协议,只不过这个使用起来稍微复杂点,简单介绍一下大概步骤:
& 首先需要安装protobuf在电脑上,window和linux安装方式不一样,具体可以百度
& 安装好之后使用对用的生成程序生成指定的javabean对应的protobuf文件
& 程序中使用基于protobuf的文件获取java对象并使用:
直接上代码:
proto包就是根据javabean生成对应的Proto文件,就是请求和响应,直接看生成之后的代码
/**
*
*/
package encoder_decoder.protobuf.proto;
/**
* 生成请求的protobuf
*/
public final class RequestProto {
private RequestProto() {}
public static void registerAllExtensions(
com.google.protobuf.ExtensionRegistry registry) {
}
public interface RequestProtoOrBuilder
extends com.google.protobuf.MessageOrBuilder {
// required int32 subReqID = 1;
/**
* <code>required int32 subReqID = 1;</code>
*/
boolean hasSubReqID();
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onChanged();
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onChanged();
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userName_ = getDefaultInstance().getUserName();
onChanged();
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com.google.protobuf.ByteString value) {
if (value == null) {
throw new NullPointerException();
}
bitField0_ |= 0x00000002;
userName_ = value;
onChanged();
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Object ref = productName_;
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productName_ = s;
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com.google.protobuf.ByteString b =
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onChanged();
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onChanged();
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ensureAddressIsMutable();
address_.set(index, value);
onChanged();
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address_.add(value);
onChanged();
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onChanged();
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onChanged();
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响应的proto文件:
// Generated by the protocol buffer compiler. DO NOT EDIT!
// source: netty/ResponseBean.proto
package encoder_decoder.protobuf.proto;
public final class ResponseProto {
private ResponseProto() {
}
public static void registerAllExtensions(com.google.protobuf.ExtensionRegistry registry) {
}
public interface ResponseBeanOrBuilder extends com.google.protobuf.MessageOrBuilder {
// required int32 subReqID = 1;
/**
* <code>required int32 subReqID = 1;</code>
*/
boolean hasSubReqID();
/**
* <code>required int32 subReqID = 1;</code>
*/
int getSubReqID();
// required int32 respCode = 2;
/**
* <code>required int32 respCode = 2;</code>
*/
boolean hasRespCode();
/**
* <code>required int32 respCode = 2;</code>
*/
int getRespCode();
// required string desc = 3;
/**
* <code>required string desc = 3;</code>
*/
boolean hasDesc();
/**
* <code>required string desc = 3;</code>
*/
String getDesc();
/**
* <code>required string desc = 3;</code>
*/
com.google.protobuf.ByteString getDescBytes();
}
/**
* Protobuf type {@code netty.ResponseBean}
*/
public static final class ResponseBean extends com.google.protobuf.GeneratedMessage implements ResponseBeanOrBuilder {
// Use ResponseBean.newBuilder() to construct.
private ResponseBean(com.google.protobuf.GeneratedMessage.Builder<?> builder) {
super(builder);
this.unknownFields = builder.getUnknownFields();
}
private ResponseBean(boolean noInit) {
this.unknownFields = com.google.protobuf.UnknownFieldSet.getDefaultInstance();
}
private static final ResponseBean defaultInstance;
public static ResponseBean getDefaultInstance() {
return defaultInstance;
}
public ResponseBean getDefaultInstanceForType() {
return defaultInstance;
}
private final com.google.protobuf.UnknownFieldSet unknownFields;
@Override
public final com.google.protobuf.UnknownFieldSet getUnknownFields() {
return this.unknownFields;
}
private ResponseBean(com.google.protobuf.CodedInputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry) throws com.google.protobuf.InvalidProtocolBufferException {
initFields();
int mutable_bitField0_ = 0;
com.google.protobuf.UnknownFieldSet.Builder unknownFields = com.google.protobuf.UnknownFieldSet.newBuilder();
try {
boolean done = false;
while (!done) {
int tag = input.readTag();
switch (tag) {
case 0:
done = true;
break;
default: {
if (!parseUnknownField(input, unknownFields, extensionRegistry, tag)) {
done = true;
}
break;
}
case 8: {
bitField0_ |= 0x00000001;
subReqID_ = input.readInt32();
break;
}
case 16: {
bitField0_ |= 0x00000002;
respCode_ = input.readInt32();
break;
}
case 26: {
bitField0_ |= 0x00000004;
desc_ = input.readBytes();
break;
}
}
}
} catch (com.google.protobuf.InvalidProtocolBufferException e) {
throw e.setUnfinishedMessage(this);
} catch (java.io.IOException e) {
throw new com.google.protobuf.InvalidProtocolBufferException(e.getMessage()).setUnfinishedMessage(this);
} finally {
this.unknownFields = unknownFields.build();
makeExtensionsImmutable();
}
}
public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
return ResponseProto.internal_static_netty_ResponseBean_descriptor;
}
protected FieldAccessorTable internalGetFieldAccessorTable() {
return ResponseProto.internal_static_netty_ResponseBean_fieldAccessorTable.ensureFieldAccessorsInitialized(
ResponseProto.ResponseBean.class, ResponseProto.ResponseBean.Builder.class);
}
public static com.google.protobuf.Parser<ResponseBean> PARSER = new com.google.protobuf.AbstractParser<ResponseBean>() {
public ResponseBean parsePartialFrom(com.google.protobuf.CodedInputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
throws com.google.protobuf.InvalidProtocolBufferException {
return new ResponseBean(input, extensionRegistry);
}
};
@Override
public com.google.protobuf.Parser<ResponseBean> getParserForType() {
return PARSER;
}
private int bitField0_;
// required int32 subReqID = 1;
public static final int SUBREQID_FIELD_NUMBER = 1;
private int subReqID_;
/**
* <code>required int32 subReqID = 1;</code>
*/
public boolean hasSubReqID() {
return ((bitField0_ & 0x00000001) == 0x00000001);
}
/**
* <code>required int32 subReqID = 1;</code>
*/
public int getSubReqID() {
return subReqID_;
}
// required int32 respCode = 2;
public static final int RESPCODE_FIELD_NUMBER = 2;
private int respCode_;
/**
* <code>required int32 respCode = 2;</code>
*/
public boolean hasRespCode() {
return ((bitField0_ & 0x00000002) == 0x00000002);
}
/**
* <code>required int32 respCode = 2;</code>
*/
public int getRespCode() {
return respCode_;
}
// required string desc = 3;
public static final int DESC_FIELD_NUMBER = 3;
private Object desc_;
/**
* <code>required string desc = 3;</code>
*/
public boolean hasDesc() {
return ((bitField0_ & 0x00000004) == 0x00000004);
}
/**
* <code>required string desc = 3;</code>
*/
public String getDesc() {
Object ref = desc_;
if (ref instanceof String) {
return (String) ref;
} else {
com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
String s = bs.toStringUtf8();
if (bs.isValidUtf8()) {
desc_ = s;
}
return s;
}
}
/**
* <code>required string desc = 3;</code>
*/
public com.google.protobuf.ByteString getDescBytes() {
Object ref = desc_;
if (ref instanceof String) {
com.google.protobuf.ByteString b = com.google.protobuf.ByteString.copyFromUtf8((String) ref);
desc_ = b;
return b;
} else {
return (com.google.protobuf.ByteString) ref;
}
}
private void initFields() {
subReqID_ = 0;
respCode_ = 0;
desc_ = "";
}
private byte memoizedIsInitialized = -1;
public final boolean isInitialized() {
byte isInitialized = memoizedIsInitialized;
if (isInitialized != -1)
return isInitialized == 1;
if (!hasSubReqID()) {
memoizedIsInitialized = 0;
return false;
}
if (!hasRespCode()) {
memoizedIsInitialized = 0;
return false;
}
if (!hasDesc()) {
memoizedIsInitialized = 0;
return false;
}
memoizedIsInitialized = 1;
return true;
}
public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
getSerializedSize();
if (((bitField0_ & 0x00000001) == 0x00000001)) {
output.writeInt32(1, subReqID_);
}
if (((bitField0_ & 0x00000002) == 0x00000002)) {
output.writeInt32(2, respCode_);
}
if (((bitField0_ & 0x00000004) == 0x00000004)) {
output.writeBytes(3, getDescBytes());
}
getUnknownFields().writeTo(output);
}
private int memoizedSerializedSize = -1;
public int getSerializedSize() {
int size = memoizedSerializedSize;
if (size != -1)
return size;
size = 0;
if (((bitField0_ & 0x00000001) == 0x00000001)) {
size += com.google.protobuf.CodedOutputStream.computeInt32Size(1, subReqID_);
}
if (((bitField0_ & 0x00000002) == 0x00000002)) {
size += com.google.protobuf.CodedOutputStream.computeInt32Size(2, respCode_);
}
if (((bitField0_ & 0x00000004) == 0x00000004)) {
size += com.google.protobuf.CodedOutputStream.computeBytesSize(3, getDescBytes());
}
size += getUnknownFields().getSerializedSize();
memoizedSerializedSize = size;
return size;
}
private static final long serialVersionUID = 0L;
@Override
protected Object writeReplace() throws java.io.ObjectStreamException {
return super.writeReplace();
}
public static ResponseProto.ResponseBean parseFrom(com.google.protobuf.ByteString data) throws com.google.protobuf.InvalidProtocolBufferException {
return PARSER.parseFrom(data);
}
public static ResponseProto.ResponseBean parseFrom(com.google.protobuf.ByteString data, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
throws com.google.protobuf.InvalidProtocolBufferException {
return PARSER.parseFrom(data, extensionRegistry);
}
public static ResponseProto.ResponseBean parseFrom(byte[] data) throws com.google.protobuf.InvalidProtocolBufferException {
return PARSER.parseFrom(data);
}
public static ResponseProto.ResponseBean parseFrom(byte[] data, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
throws com.google.protobuf.InvalidProtocolBufferException {
return PARSER.parseFrom(data, extensionRegistry);
}
public static ResponseProto.ResponseBean parseFrom(java.io.InputStream input) throws java.io.IOException {
return PARSER.parseFrom(input);
}
public static ResponseProto.ResponseBean parseFrom(java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
throws java.io.IOException {
return PARSER.parseFrom(input, extensionRegistry);
}
public static ResponseProto.ResponseBean parseDelimitedFrom(java.io.InputStream input) throws java.io.IOException {
return PARSER.parseDelimitedFrom(input);
}
public static ResponseProto.ResponseBean parseDelimitedFrom(java.io.InputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
throws java.io.IOException {
return PARSER.parseDelimitedFrom(input, extensionRegistry);
}
public static ResponseProto.ResponseBean parseFrom(com.google.protobuf.CodedInputStream input) throws java.io.IOException {
return PARSER.parseFrom(input);
}
public static ResponseProto.ResponseBean parseFrom(com.google.protobuf.CodedInputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry)
throws java.io.IOException {
return PARSER.parseFrom(input, extensionRegistry);
}
public static Builder newBuilder() {
return Builder.create();
}
public Builder newBuilderForType() {
return newBuilder();
}
public static Builder newBuilder(ResponseProto.ResponseBean prototype) {
return newBuilder().mergeFrom(prototype);
}
public Builder toBuilder() {
return newBuilder(this);
}
@Override
protected Builder newBuilderForType(BuilderParent parent) {
Builder builder = new Builder(parent);
return builder;
}
/**
* Protobuf type {@code netty.ResponseBean}
*/
public static final class Builder extends com.google.protobuf.GeneratedMessage.Builder<Builder> implements ResponseProto.ResponseBeanOrBuilder {
public static final com.google.protobuf.Descriptors.Descriptor getDescriptor() {
return ResponseProto.internal_static_netty_ResponseBean_descriptor;
}
protected FieldAccessorTable internalGetFieldAccessorTable() {
return ResponseProto.internal_static_netty_ResponseBean_fieldAccessorTable.ensureFieldAccessorsInitialized(
ResponseProto.ResponseBean.class, ResponseProto.ResponseBean.Builder.class);
}
// Construct using ResponseProto.ResponseBean.newBuilder()
private Builder() {
maybeForceBuilderInitialization();
}
private Builder(BuilderParent parent) {
super(parent);
maybeForceBuilderInitialization();
}
private void maybeForceBuilderInitialization() {
if (com.google.protobuf.GeneratedMessage.alwaysUseFieldBuilders) {
}
}
private static Builder create() {
return new Builder();
}
public Builder clear() {
super.clear();
subReqID_ = 0;
bitField0_ = (bitField0_ & ~0x00000001);
respCode_ = 0;
bitField0_ = (bitField0_ & ~0x00000002);
desc_ = "";
bitField0_ = (bitField0_ & ~0x00000004);
return this;
}
public Builder clone() {
return create().mergeFrom(buildPartial());
}
public com.google.protobuf.Descriptors.Descriptor getDescriptorForType() {
return ResponseProto.internal_static_netty_ResponseBean_descriptor;
}
public ResponseProto.ResponseBean getDefaultInstanceForType() {
return ResponseProto.ResponseBean.getDefaultInstance();
}
public ResponseProto.ResponseBean build() {
ResponseProto.ResponseBean result = buildPartial();
if (!result.isInitialized()) {
throw newUninitializedMessageException(result);
}
return result;
}
public ResponseProto.ResponseBean buildPartial() {
ResponseProto.ResponseBean result = new ResponseProto.ResponseBean(this);
int from_bitField0_ = bitField0_;
int to_bitField0_ = 0;
if (((from_bitField0_ & 0x00000001) == 0x00000001)) {
to_bitField0_ |= 0x00000001;
}
result.subReqID_ = subReqID_;
if (((from_bitField0_ & 0x00000002) == 0x00000002)) {
to_bitField0_ |= 0x00000002;
}
result.respCode_ = respCode_;
if (((from_bitField0_ & 0x00000004) == 0x00000004)) {
to_bitField0_ |= 0x00000004;
}
result.desc_ = desc_;
result.bitField0_ = to_bitField0_;
onBuilt();
return result;
}
public Builder mergeFrom(com.google.protobuf.Message other) {
if (other instanceof ResponseProto.ResponseBean) {
return mergeFrom((ResponseProto.ResponseBean) other);
} else {
super.mergeFrom(other);
return this;
}
}
public Builder mergeFrom(ResponseProto.ResponseBean other) {
if (other == ResponseProto.ResponseBean.getDefaultInstance())
return this;
if (other.hasSubReqID()) {
setSubReqID(other.getSubReqID());
}
if (other.hasRespCode()) {
setRespCode(other.getRespCode());
}
if (other.hasDesc()) {
bitField0_ |= 0x00000004;
desc_ = other.desc_;
onChanged();
}
this.mergeUnknownFields(other.getUnknownFields());
return this;
}
public final boolean isInitialized() {
if (!hasSubReqID()) {
return false;
}
if (!hasRespCode()) {
return false;
}
if (!hasDesc()) {
return false;
}
return true;
}
public Builder mergeFrom(com.google.protobuf.CodedInputStream input, com.google.protobuf.ExtensionRegistryLite extensionRegistry) throws java.io.IOException {
ResponseProto.ResponseBean parsedMessage = null;
try {
parsedMessage = PARSER.parsePartialFrom(input, extensionRegistry);
} catch (com.google.protobuf.InvalidProtocolBufferException e) {
parsedMessage = (ResponseProto.ResponseBean) e.getUnfinishedMessage();
throw e;
} finally {
if (parsedMessage != null) {
mergeFrom(parsedMessage);
}
}
return this;
}
private int bitField0_;
// required int32 subReqID = 1;
private int subReqID_;
/**
* <code>required int32 subReqID = 1;</code>
*/
public boolean hasSubReqID() {
return ((bitField0_ & 0x00000001) == 0x00000001);
}
/**
* <code>required int32 subReqID = 1;</code>
*/
public int getSubReqID() {
return subReqID_;
}
/**
* <code>required int32 subReqID = 1;</code>
*/
public Builder setSubReqID(int value) {
bitField0_ |= 0x00000001;
subReqID_ = value;
onChanged();
return this;
}
/**
* <code>required int32 subReqID = 1;</code>
*/
public Builder clearSubReqID() {
bitField0_ = (bitField0_ & ~0x00000001);
subReqID_ = 0;
onChanged();
return this;
}
// required int32 respCode = 2;
private int respCode_;
/**
* <code>required int32 respCode = 2;</code>
*/
public boolean hasRespCode() {
return ((bitField0_ & 0x00000002) == 0x00000002);
}
/**
* <code>required int32 respCode = 2;</code>
*/
public int getRespCode() {
return respCode_;
}
/**
* <code>required int32 respCode = 2;</code>
*/
public Builder setRespCode(int value) {
bitField0_ |= 0x00000002;
respCode_ = value;
onChanged();
return this;
}
/**
* <code>required int32 respCode = 2;</code>
*/
public Builder clearRespCode() {
bitField0_ = (bitField0_ & ~0x00000002);
respCode_ = 0;
onChanged();
return this;
}
// required string desc = 3;
private Object desc_ = "";
/**
* <code>required string desc = 3;</code>
*/
public boolean hasDesc() {
return ((bitField0_ & 0x00000004) == 0x00000004);
}
/**
* <code>required string desc = 3;</code>
*/
public String getDesc() {
Object ref = desc_;
if (!(ref instanceof String)) {
String s = ((com.google.protobuf.ByteString) ref).toStringUtf8();
desc_ = s;
return s;
} else {
return (String) ref;
}
}
/**
* <code>required string desc = 3;</code>
*/
public com.google.protobuf.ByteString getDescBytes() {
Object ref = desc_;
if (ref instanceof String) {
com.google.protobuf.ByteString b = com.google.protobuf.ByteString.copyFromUtf8((String) ref);
desc_ = b;
return b;
} else {
return (com.google.protobuf.ByteString) ref;
}
}
/**
* <code>required string desc = 3;</code>
*/
public Builder setDesc(String value) {
if (value == null) {
throw new NullPointerException();
}
bitField0_ |= 0x00000004;
desc_ = value;
onChanged();
return this;
}
/**
* <code>required string desc = 3;</code>
*/
public Builder clearDesc() {
bitField0_ = (bitField0_ & ~0x00000004);
desc_ = getDefaultInstance().getDesc();
onChanged();
return this;
}
/**
* <code>required string desc = 3;</code>
*/
public Builder setDescBytes(com.google.protobuf.ByteString value) {
if (value == null) {
throw new NullPointerException();
}
bitField0_ |= 0x00000004;
desc_ = value;
onChanged();
return this;
}
// @@protoc_insertion_point(builder_scope:netty.ResponseBean)
}
static {
defaultInstance = new ResponseBean(true);
defaultInstance.initFields();
}
// @@protoc_insertion_point(class_scope:netty.ResponseBean)
}
private static com.google.protobuf.Descriptors.Descriptor internal_static_netty_ResponseBean_descriptor;
private static com.google.protobuf.GeneratedMessage.FieldAccessorTable internal_static_netty_ResponseBean_fieldAccessorTable;
public static com.google.protobuf.Descriptors.FileDescriptor getDescriptor() {
return descriptor;
}
private static com.google.protobuf.Descriptors.FileDescriptor descriptor;
static {
String[] descriptorData = { "\n\031netty/ResponseBean.proto\022\005netty\"A\n\rSu" + "bscribeResp\022\020\n\010subReqID\030\001 \002(\005\022\020\n\010respCod"
+ "e\030\002 \002(\005\022\014\n\004desc\030\003 \002(\tB3\n\035com.phei.netty." + "codec.protobufB\022ResponseProto" };
com.google.protobuf.Descriptors.FileDescriptor.InternalDescriptorAssigner assigner = new com.google.protobuf.Descriptors.FileDescriptor.InternalDescriptorAssigner() {
public com.google.protobuf.ExtensionRegistry assignDescriptors(com.google.protobuf.Descriptors.FileDescriptor root) {
descriptor = root;
internal_static_netty_ResponseBean_descriptor = getDescriptor().getMessageTypes().get(0);
internal_static_netty_ResponseBean_fieldAccessorTable = new com.google.protobuf.GeneratedMessage.FieldAccessorTable(internal_static_netty_ResponseBean_descriptor,
new String[] { "SubReqID", "RespCode", "Desc", });
return null;
}
};
com.google.protobuf.Descriptors.FileDescriptor.internalBuildGeneratedFileFrom(descriptorData, new com.google.protobuf.Descriptors.FileDescriptor[] {}, assigner);
}
// @@protoc_insertion_point(outer_class_scope)
}
接下来看一下客户端的handler:
package encoder_decoder.protobuf.client;
import encoder_decoder.protobuf.proto.RequestProto;
import io.netty.channel.ChannelHandlerAdapter;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import java.util.ArrayList;
import java.util.List;
/**
* @author jiahp
* @function 处理客户端的io线程
*/
public class ProtobufClientHandler extends ChannelInboundHandlerAdapter {
public ProtobufClientHandler() {
}
public void channelActive(ChannelHandlerContext ctx) {
for (int i = 0; i < 10; i++) {
ctx.writeAndFlush(subReq(i));
}
}
private RequestProto.RequestBean subReq(int i) {
//基于生成的proto文件获取对象
RequestProto.RequestBean.Builder builder = RequestProto.RequestBean.newBuilder();
builder.setSubReqID(i);
builder.setUserName("JHP");
builder.setProductName("Netty Book For Protobuf");
List<String> address = new ArrayList();
address.add("NanJing YuHuaTai");
address.add("BeiJing LiuLiChang");
address.add("ShenZhen HongShuLin");
builder.addAllAddress(address);
return builder.build();
}
public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
System.out.println("Receive server response : [" + msg + "]");
}
public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
ctx.flush();
}
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
cause.printStackTrace();
ctx.close();
}
}
客户端发送请求:
package encoder_decoder.protobuf.client;
import encoder_decoder.protobuf.proto.RequestProto;
import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.protobuf.ProtobufDecoder;
import io.netty.handler.codec.protobuf.ProtobufEncoder;
import io.netty.handler.codec.protobuf.ProtobufVarint32FrameDecoder;
import io.netty.handler.codec.protobuf.ProtobufVarint32LengthFieldPrepender;
/**
* 处理protobuf的client
*/
public class ProtobufClient {
public void connect(int port, String host) throws Exception {
// 配置客户端NIO线程组
EventLoopGroup group = new NioEventLoopGroup();
try {
Bootstrap b = new Bootstrap();
b.group(group).channel(NioSocketChannel.class).option(ChannelOption.TCP_NODELAY, true).handler(new ChannelInitializer<SocketChannel>() {
@Override
public void initChannel(SocketChannel ch) throws Exception {
//添加netty自带的protobuf解码实现
ch.pipeline().addLast(new ProtobufVarint32FrameDecoder());
ch.pipeline().addLast(new ProtobufDecoder(RequestProto.RequestBean.getDefaultInstance()));
ch.pipeline().addLast(new ProtobufVarint32LengthFieldPrepender());
//添加netty自带的protobuf编码实现
ch.pipeline().addLast(new ProtobufEncoder());
ch.pipeline().addLast(new ProtobufClientHandler());
}
});
// 发起异步连接操作
ChannelFuture f = b.connect(host, port).sync();
// 当代客户端链路关闭
f.channel().closeFuture().sync();
} finally {
// 优雅退出，释放NIO线程组
group.shutdownGracefully();
}
}
/**
* @param args
* @throws Exception
*/
public static void main(String[] args) throws Exception {
int port = 8080;
if (args != null && args.length > 0) {
try {
port = Integer.valueOf(args[0]);
} catch (NumberFormatException e) {
// 采用默认值
}
}
new ProtobufClient().connect(port, "127.0.0.1");
}
}
再看对应的服务端处理handler和服务端处理客户端的请求:
package encoder_decoder.protobuf.server;
import encoder_decoder.protobuf.proto.RequestProto;
import encoder_decoder.protobuf.proto.ResponseProto;
import io.netty.channel.ChannelHandler.Sharable;
import io.netty.channel.ChannelHandlerAdapter;
import io.netty.channel.ChannelHandlerContext;
/**
* 处理client的handler
* @ author jiahp
*/
@Sharable
public class ProtobufServerHandler extends ChannelHandlerAdapter {
public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
RequestProto.RequestBean req = (RequestProto.RequestBean) msg;
if ("JHP".equalsIgnoreCase(req.getUserName())) {
System.out.println("Service accept client subscribe req : [" + req.toString() + "]");
ctx.writeAndFlush(resp(req.getSubReqID()));
}
}
private ResponseProto.ResponseBean resp(int subReqID) {
//基于protobuf生成的文件获取响应对象
ResponseProto.ResponseBean.Builder builder = ResponseProto.ResponseBean.newBuilder();
builder.setSubReqID(subReqID);
builder.setRespCode(0);
builder.setDesc("Netty book order succeed, 3 days later, sent to the designated address");
return builder.build();
}
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
cause.printStackTrace();
ctx.close();// 发生异常，关闭链路
}
}
服务端处理:
package encoder_decoder.protobuf.server;
import encoder_decoder.masharlling.server.RequestServerHandler;
import encoder_decoder.protobuf.proto.RequestProto;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.protobuf.ProtobufDecoder;
import io.netty.handler.codec.protobuf.ProtobufEncoder;
import io.netty.handler.codec.protobuf.ProtobufVarint32FrameDecoder;
import io.netty.handler.codec.protobuf.ProtobufVarint32LengthFieldPrepender;
import io.netty.handler.logging.LogLevel;
import io.netty.handler.logging.LoggingHandler;
/**
* @author jiahp
* @function 处理protobuf的server
*/
public class ProtobufServer {
public void bind(int port) throws Exception {
// 配置服务端的NIO线程组
EventLoopGroup bossGroup = new NioEventLoopGroup();
EventLoopGroup workerGroup = new NioEventLoopGroup();
try {
ServerBootstrap b = new ServerBootstrap();
b.group(bossGroup, workerGroup).channel(NioServerSocketChannel.class).option(ChannelOption.SO_BACKLOG, 100).handler(new LoggingHandler(LogLevel.INFO))
.childHandler(new ChannelInitializer<SocketChannel>() {
@Override
public void initChannel(SocketChannel ch) {
//添加netty自带的解码实现
ch.pipeline().addLast(new ProtobufVarint32FrameDecoder());
ch.pipeline().addLast(new ProtobufDecoder(RequestProto.RequestBean.getDefaultInstance()));
ch.pipeline().addLast(new ProtobufVarint32LengthFieldPrepender());
//添加netty自带的编码实现
ch.pipeline().addLast(new ProtobufEncoder());
ch.pipeline().addLast(new RequestServerHandler());
}
});
// 绑定端口，同步等待成功
ChannelFuture f = b.bind(port).sync();
// 等待服务端监听端口关闭
f.channel().closeFuture().sync();
} finally {
// 优雅退出，释放线程池资源
bossGroup.shutdownGracefully();
workerGroup.shutdownGracefully();
}
}
public static void main(String[] args) throws Exception {
int port = 8080;
if (args != null && args.length > 0) {
try {
port = Integer.valueOf(args[0]);
} catch (NumberFormatException e) {
// 采用默认值
}
}
new ProtobufServer().bind(port);
}
}
可以看一下测试效果:
以及响应结果:
到目前为止都是使用netty里面提供的相关编解码器,但是实际业务中有时候需要开发者自定义编解码完成特定的功能,最后就介绍一下如何实现自定义编解码功能(没有使用编解码器的情况消息都是bytebuf),
实现自定义编解码功能完成Double类型转换:代码结构
首先实现自定义编码器:double数值转换字节码
package encoder_decoder.custom.encoder;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.MessageToByteEncoder;
/**
* @ author jiahp
* @ function 自定义编码器
*/
public class DoubleToByteEncoder extends MessageToByteEncoder<Double> {
@Override
protected void encode(ChannelHandlerContext ctx, Double value, ByteBuf out)
throws Exception {
System.out.println("custom encoder msg is: " + value);
out.writeDouble(value);
}
}
对应的解码器:字节码转换为double类型数值
package encoder_decoder.custom.decoder;
import java.util.List;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.ByteToMessageDecoder;
/**
* @ author jiahp
* @ function 自定义解码器
*/
public class ByteToDoubleDecoder extends ByteToMessageDecoder {
@Override
protected void decode(ChannelHandlerContext ctx, ByteBuf in,
List<Object> out) throws Exception {
//需要做检查 可读字节一定要大于4
if (in.readableBytes() >= 4) {
double value = in.readDouble();
System.out.println("custom decoder msg is: " + value);
out.add(value);
}
}
}
看看客户端相关代码:
package encoder_decoder.custom.client;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.util.ReferenceCountUtil;
/**
* @Author 18011618
* @Description 客户端处理的handlerss
* @Date 14:32 2018/6/25
* @Modify By
*/
public class CustomClientHandler extends ChannelInboundHandlerAdapter {
/**
* 客户端连接上服务端之后会调用此方法
* @param ctx
* @throws Exception
*/
@Override
public void channelActive(ChannelHandlerContext ctx) throws Exception {
for (int i = 0; i <2 ; i++) {
ctx.writeAndFlush(i*0.01);
}
}
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg)
throws Exception {
try {
Double body = (Double) msg;
System.out.println("Client :" + body.toString());
} finally {
ReferenceCountUtil.release(msg);
}
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause)
throws Exception {
ctx.close();
}
}
和客户端:
package encoder_decoder.custom.client;
import encoder_decoder.custom.decoder.ByteToDoubleDecoder;
import encoder_decoder.custom.encoder.DoubleToByteEncoder;
import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
/**
* @Author jiahp
* @Description 客户端
* @Date 14:32 2018/6/25
* @Modify By
*/
public class CustomClient {
/**
* 连接服务器
*
* @param port
* @param host
* @throws Exception
*/
public void connect(int port, String host) throws Exception {
EventLoopGroup group = new NioEventLoopGroup();
try {
Bootstrap b = new Bootstrap();
b.group(group)
.channel(NioSocketChannel.class)
.option(ChannelOption.TCP_NODELAY, true)
.handler(new ClientChannelHandler());//
ChannelFuture f = b.connect(host, port).sync();
f.channel().closeFuture().sync();
} finally {
group.shutdownGracefully();
}
}
/**
* 网络事件处理器
*/
private class ClientChannelHandler extends ChannelInitializer<SocketChannel> {
@Override
protected void initChannel(SocketChannel ch) throws Exception {
// 增加自定义的编码器和解码器
ch.pipeline().addLast(new DoubleToByteEncoder());
ch.pipeline().addLast(new ByteToDoubleDecoder());
// 客户端的处理器
ch.pipeline().addLast(new CustomClientHandler());
}
}
public static void main(String[] args) throws Exception {
new CustomClient().connect(8080, "127.0.0.1");
}
}
再看对应的服务端handler:
package encoder_decoder.custom.server;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
/**
* @Author 18011618
* @Description
* @Date 14:32 2018/6/25
* @Modify By
*/
public class CustomServerHandler extends ChannelInboundHandlerAdapter{
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg)
throws Exception {
//默认的Msg是bytebuf类型 需要进行转换操作
//现在自定义编解码器就可以直接进行强转
Double body = (Double) msg;
System.out.println("Client :" + body.toString());
ctx.writeAndFlush(11.44);
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause)
throws Exception {
ctx.close();
}
@Override
public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
ctx.flush();
}
}
对应的服务端:
package encoder_decoder.custom.server;
import encoder_decoder.custom.decoder.ByteToDoubleDecoder;
import encoder_decoder.custom.encoder.DoubleToByteEncoder;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
/**
* @Author jiahp
* @Description
* @Date 14:32 2018/6/25
* @Modify By
*/
public class CustomServer {
public void bind(int port) throws Exception {
EventLoopGroup bossGroup = new NioEventLoopGroup();
EventLoopGroup workerGroup = new NioEventLoopGroup();
try {
ServerBootstrap serverBootstrap = new ServerBootstrap();
serverBootstrap.group(bossGroup, workerGroup)
.channel(NioServerSocketChannel.class)//
.option(ChannelOption.SO_BACKLOG, 1024)
.option(ChannelOption.SO_BACKLOG, 1024)
.option(ChannelOption.SO_SNDBUF, 32 * 1024)
.option(ChannelOption.SO_RCVBUF, 32 * 1024)
.option(ChannelOption.SO_KEEPALIVE, true)
.childHandler(new ChildChannelHandler());
ChannelFuture f = serverBootstrap.bind(port).sync();
// 等待服务端监听端口关闭
f.channel().closeFuture().sync();
} finally {
// 优雅退出 释放线程池资源
bossGroup.shutdownGracefully();
workerGroup.shutdownGracefully();
}
}
/**
* channel的初始化
*/
private class ChildChannelHandler extends ChannelInitializer<SocketChannel> {
@Override
protected void initChannel(SocketChannel ch) throws Exception {
// 增加自定义的编码器和解码器
ch.pipeline().addLast(new DoubleToByteEncoder());
ch.pipeline().addLast(new ByteToDoubleDecoder());
// 服务端的处理器
ch.pipeline().addLast(new CustomServerHandler());
}
}
public static void main(String[] args) throws Exception {
int port = 8080;
new CustomServer().bind(port);
}
}
最后看一下运行效果:
和
上面就实现了一个简单的自定义编解码器,功能虽然很简单,但是实际业务中只不过逻辑可能比较复杂,但步骤和思路基本是一致的,在后面还会介绍如何使用自定义编码+自定义协议完成更复杂的实例.
最后加上项目pom.xml的配置文件:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.suning.netty</groupId>
<artifactId>netty_code</artifactId>
<version>1.0-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>io.netty</groupId>
<artifactId>netty-all</artifactId>
<version>4.1.6.Final</version>
</dependency>
<!--注意这里要手动加上jboss-marshalling-serial.jar,否则会出现运行的时候服务端是接收不到数据的-->
<dependency>
<groupId>org.jboss.marshalling</groupId>
<artifactId>jboss-marshalling-serial</artifactId>
<version>1.4.0.Final</version>
</dependency>
<dependency>
<groupId>org.jboss.marshalling</groupId>
<artifactId>jboss-marshalling-serial</artifactId>
<version>1.4.0.Final</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.google.protobuf/protobuf-java -->
<dependency>
<groupId>com.google.protobuf</groupId>
<artifactId>protobuf-java</artifactId>
<version>2.5.0</version>
</dependency>
</dependencies>
</project>