• Netty与Spring Boot的整合

    ​ 最近有朋友向我询问一些Netty与SpringBoot整合的相关问题，这里，我就总结了一下基本整合流程，也就是说，这篇文章 ，默认大家是对netty与Spring，SpringMVC的整合是没有什么问题的。现在，就进入正题吧。

    Server端：

    总的来说，服务端还是比较简单的，自己一共写了三个核心类。分别是

    • NettyServerListener：服务启动监听器
    • ServerChannelHandlerAdapter：通道适配器，主要用于多线程共享
    • RequestDispatcher：请求分排器

    下面开始集成过程：

    1. 在pom.xml中添加以下依赖

      <dependency>
  <groupId>io.netty</groupId>
  <artifactId>netty-all</artifactId>
  <version>5.0.0.Alpha2</version>
</dependency>
<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-configuration-processor</artifactId>
   <optional>true</optional>
</dependency>

    2. 让SpringBoot的启动类实现CommandLineRunner接口并重写run方法,比如我的启动类是CloudApplication.java

      @SpringBootApplication
public class CloudApplication implements CommandLineRunner {

    public static void main(String[] args) {
        SpringApplication.run(CloudApplication.class, args);
    }

    @Override
    public void run(String... strings) {
    }
}

    3. 创建类NettyServerListener.java

      // 读取yml的一个配置类
import com.edu.hart.modules.constant.NettyConfig;
// Netty连接信息配置类
import com.edu.hart.modules.constant.NettyConstant;
// 
import com.edu.hart.rpc.util.ObjectCodec;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
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.LengthFieldBasedFrameDecoder;
import io.netty.handler.codec.LengthFieldPrepender;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

import javax.annotation.PreDestroy;
import javax.annotation.Resource;

/**
 * 服务启动监听器
 *
 * @author 叶云轩
 */
@Component
public class NettyServerListener {
    /**
     * NettyServerListener 日志输出器
     *
     * @author 叶云轩 create by 2017/10/31 18:05
     */
    private static final Logger LOGGER = LoggerFactory.getLogger(NettyServerListener.class);
    /**
     * 创建bootstrap
     */
    ServerBootstrap serverBootstrap = new ServerBootstrap();
    /**
     * BOSS
     */
    EventLoopGroup boss = new NioEventLoopGroup();
    /**
     * Worker
     */
    EventLoopGroup work = new NioEventLoopGroup();
    /**
     * 通道适配器
     */
    @Resource
    private ServerChannelHandlerAdapter channelHandlerAdapter;
    /**
     * NETT服务器配置类
     */
    @Resource
    private NettyConfig nettyConfig;
  
    /**
     * 关闭服务器方法
     */
    @PreDestroy
    public void close() {
        LOGGER.info("关闭服务器....");
        //优雅退出
        boss.shutdownGracefully();
        work.shutdownGracefully();
    }

    /**
     * 开启及服务线程
     */
    public void start() {
        // 从配置文件中(application.yml)获取服务端监听端口号
        int port = nettyConfig.getPort();
        serverBootstrap.group(boss, work)
                .channel(NioServerSocketChannel.class)
                .option(ChannelOption.SO_BACKLOG, 100)
                .handler(new LoggingHandler(LogLevel.INFO));
        try {
            //设置事件处理
            serverBootstrap.childHandler(new ChannelInitializer<SocketChannel>() {
                @Override
                protected void initChannel(SocketChannel ch) throws Exception {
                    ChannelPipeline pipeline = ch.pipeline();
                    pipeline.addLast(new LengthFieldBasedFrameDecoder(nettyConfig.getMaxFrameLength()
                            , 0, 2, 0, 2));
                    pipeline.addLast(new LengthFieldPrepender(2));
                    pipeline.addLast(new ObjectCodec());

                    pipeline.addLast(channelHandlerAdapter);
                }
            });
            LOGGER.info("netty服务器在[{}]端口启动监听", port);
            ChannelFuture f = serverBootstrap.bind(port).sync();
            f.channel().closeFuture().sync();
        } catch (InterruptedException e) {
            LOGGER.info("[出现异常] 释放资源");
            boss.shutdownGracefully();
            work.shutdownGracefully();
        }
    }
}

    4. 创建类ServerChannelHandlerAdapter.java - 通道适配器

      // 记录调用方法的元信息的类
import com.edu.hart.rpc.entity.MethodInvokeMeta;
import io.netty.channel.ChannelHandler.Sharable;
import io.netty.channel.ChannelHandlerAdapter;
import io.netty.channel.ChannelHandlerContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;

/**
 * 多线程共享
 */
@Component
@Sharable
public class ServerChannelHandlerAdapter extends ChannelHandlerAdapter {
   /**
     * 日志处理
     */
    private Logger logger = LoggerFactory.getLogger(ServerChannelHandlerAdapter.class);
 /**
     * 注入请求分排器
     */
    @Resource
    private RequestDispatcher dispatcher;

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
        cause.printStackTrace();
        ctx.close();
    }

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) {
        MethodInvokeMeta invokeMeta = (MethodInvokeMeta) msg;
        // 屏蔽toString()方法
        if (invokeMeta.getMethodName().endsWith("toString()")
                && !"class java.lang.String".equals(invokeMeta.getReturnType().toString()))
            logger.info("客户端传入参数 :{},返回值：{}",
                    invokeMeta.getArgs(), invokeMeta.getReturnType());
        dispatcher.dispatcher(ctx, invokeMeta);
    }
}

    5. RequestDispatcher.java

      // 封装的返回信息枚举类
import com.edu.hart.modules.communicate.ResponseCodeEnum;
// 封装的返回信息实体类
import com.edu.hart.modules.communicate.ResponseResult;
// 封装的连接常量类
import com.edu.hart.modules.constant.NettyConstant;
// 记录元方法信息的实体类
import com.edu.hart.rpc.entity.MethodInvokeMeta;
// 对于返回值为空的一个处理
import com.edu.hart.rpc.entity.NullWritable;
// 封装的返回信息实体工具类
import com.edu.hart.rpc.util.ResponseResultUtil;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

/**
 * 请求分排器
 */
@Component
public class RequestDispatcher implements ApplicationContextAware {
    private ExecutorService executorService = Executors.newFixedThreadPool(NettyConstant.getMaxThreads());
    private ApplicationContext app;

    /**
     * 发送
     *
     * @param ctx
     * @param invokeMeta
     */
    public void dispatcher(final ChannelHandlerContext ctx, final MethodInvokeMeta invokeMeta) {
        executorService.submit(() -> {
            ChannelFuture f = null;
            try {
                Class<?> interfaceClass = invokeMeta.getInterfaceClass();
                String name = invokeMeta.getMethodName();
                Object[] args = invokeMeta.getArgs();
                Class<?>[] parameterTypes = invokeMeta.getParameterTypes();
                Object targetObject = app.getBean(interfaceClass);
                Method method = targetObject.getClass().getMethod(name, parameterTypes);
                Object obj = method.invoke(targetObject, args);
                if (obj == null) {
                    f = ctx.writeAndFlush(NullWritable.nullWritable());
                } else {
                    f = ctx.writeAndFlush(obj);
                }
                f.addListener(ChannelFutureListener.CLOSE);
            } catch (Exception e) {
                ResponseResult error = ResponseResultUtil.error(ResponseCodeEnum.SERVER_ERROR);
                f = ctx.writeAndFlush(error);
            } finally {
                f.addListener(ChannelFutureListener.CLOSE);
            }
        });
    }

    /**
     * 加载当前application.xml
     *
     * @param ctx
     * @throws BeansException
     */
    public void setApplicationContext(ApplicationContext ctx) throws BeansException {
        this.app = ctx;
    }
}

    6. application.yml文件中对于netty的一个配置

      netty:
  port: 11111

    7. NettyConfig.java

      import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

/**
 * 读取yml配置文件中的信息
 * Created by 叶云轩 on 2017/10/31 - 18:38
 * Concat tdg_yyx@foxmail.com
 */
@Component
@ConfigurationProperties(prefix = "netty")
public class NettyConfig {

    private int port;

    public int getPort() {
        return port;
    }

    public void setPort(int port) {
        this.port = port;
    }
}

    8. NettyConstanct.java

      import org.springframework.stereotype.Component;

/**
 * Netty服务器常量
 * Created by 叶云轩 on 2017/10/31 - 17:47
 * Concat tdg_yyx@foxmail.com
 */
@Component
public class NettyConstant {

    /**
     * 最大线程量
     */
    private static final int MAX_THREADS = 1024;
    /**
     * 数据包最大长度
     */
    private static final int MAX_FRAME_LENGTH = 65535;

    public static int getMaxFrameLength() {
        return MAX_FRAME_LENGTH;
    }

    public static int getMaxThreads() {
        return MAX_THREADS;
    }
}

      至此，netty服务端算是与SpringBoot整合成功。那么看一下启动情况吧。

      spring-boot netty集成启动

    Client端：

    Client我感觉要比Server端要麻烦一点。这里还是先给出核心类吧。

    • NettyClient ： netty客户端
    • ClientChannelHandlerAdapter ： 客户端通道适配器
    • CustomChannelInitalizer：自定义通道初始化工具
    • RPCProxyFactoryBean：RPC通信代理工厂

    在Client端里。SpringBoot的启动类要继承SpringBootServletInitializer这个类，并覆盖SpringApplicationBuilder方法

    import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.support.SpringBootServletInitializer;

@SpringBootApplication
public class OaApplication extends SpringBootServletInitializer {

    public static void main(String[] args) {
        SpringApplication.run(OaApplication.class, args);
    }

    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
        return builder.sources(OaApplication.class);
    }
}

    1. NettyClient.java

      // 记录元方法信息的实体类
import com.edu.hart.rpc.entity.MethodInvokeMeta;
import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioSocketChannel;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.management.MBeanServer;

/**
 * 客户端发送类
 * Created by 叶云轩 on 2017/6/16-16:58
 * Concat tdg_yyx@foxmail.com
 */
public class NettyClient {

    private Logger logger = LoggerFactory.getLogger(MBeanServer.class);
    private Bootstrap bootstrap;
    private EventLoopGroup worker;
    private int port;
    private String url;
    private int MAX_RETRY_TIMES = 10;

    public NettyClient(String url, int port) {
        this.url = url;
        this.port = port;
        bootstrap = new Bootstrap();
        worker = new NioEventLoopGroup();
        bootstrap.group(worker);
        bootstrap.channel(NioSocketChannel.class);
    }

    public void close() {
        logger.info("关闭资源");
        worker.shutdownGracefully();
    }

    public Object remoteCall(final MethodInvokeMeta cmd, int retry) {
        try {
            CustomChannelInitializerClient customChannelInitializer = new CustomChannelInitializerClient(cmd);
            bootstrap.handler(customChannelInitializer);
            ChannelFuture sync = bootstrap.connect(url, port).sync();
            sync.channel().closeFuture().sync();
            Object response = customChannelInitializer.getResponse();
            return response;
        } catch (InterruptedException e) {
            retry++;
            if (retry > MAX_RETRY_TIMES) {
                throw new RuntimeException("调用Wrong");
            } else {
                try {
                    Thread.sleep(100);
                } catch (InterruptedException e1) {
                    e1.printStackTrace();
                }
                logger.info("第{}次尝试....失败", retry);
                return remoteCall(cmd, retry);
            }
        }
    }
}

    2. ClientChannelHandlerAdapter.java

      import com.edu.hart.rpc.entity.MethodInvokeMeta;
import io.netty.channel.ChannelHandlerAdapter;
import io.netty.channel.ChannelHandlerContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Created by 叶云轩 on 2017/6/16-17:03
 * Concat tdg_yyx@foxmail.com
 */
public class ClientChannelHandlerAdapter extends ChannelHandlerAdapter {
    private Logger logger = LoggerFactory.getLogger(ClientChannelHandlerAdapter.class);
    private MethodInvokeMeta methodInvokeMeta;
    private CustomChannelInitializerClient channelInitializerClient;

    public ClientChannelHandlerAdapter(MethodInvokeMeta methodInvokeMeta, CustomChannelInitializerClient channelInitializerClient) {
        this.methodInvokeMeta = methodInvokeMeta;
        this.channelInitializerClient = channelInitializerClient;
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        logger.info("客户端出异常了,异常信息:{}", cause.getMessage());
        cause.printStackTrace();
        ctx.close();
    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        if (methodInvokeMeta.getMethodName().endsWith("toString") && !"class java.lang.String".equals(methodInvokeMeta.getReturnType().toString()))
            logger.info("客户端发送信息参数:{},信息返回值类型：{}", methodInvokeMeta.getArgs(), methodInvokeMeta.getReturnType());
        ctx.writeAndFlush(methodInvokeMeta);

    }

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        channelInitializerClient.setResponse(msg);
    }
}

    3. CustomChannelInitializerClient.java

      import com.edu.hart.rpc.entity.MethodInvokeMeta;
import com.edu.hart.rpc.entity.NullWritable;
import com.edu.hart.rpc.util.ObjectCodec;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.socket.SocketChannel;
import io.netty.handler.codec.LengthFieldBasedFrameDecoder;
import io.netty.handler.codec.LengthFieldPrepender;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

      /**

      • Created by 叶云轩 on 2017/6/16-15:01
      • Concat tdg_yyx@foxmail.com
        */
        public class CustomChannelInitializerClient extends ChannelInitializer {
       private Logger logger = LoggerFactory.getLogger(CustomChannelInitializerClient.class);

   private MethodInvokeMeta methodInvokeMeta;

   private Object response;

   public CustomChannelInitializerClient(MethodInvokeMeta methodInvokeMeta) {
       if (!"toString".equals(methodInvokeMeta.getMethodName())) {
           logger.info("[CustomChannelInitializerClient] 调用方法名：{}，入参：{},参数类型：{}，返回值类型{}"
                   , methodInvokeMeta.getMethodName()
                   , methodInvokeMeta.getArgs()
                   , methodInvokeMeta.getParameterTypes()
                   , methodInvokeMeta.getReturnType());
       }
       this.methodInvokeMeta = methodInvokeMeta;
   }

   public Object getResponse() {
       if (response instanceof NullWritable) {
           return null;
       }
       return response;
   }

   public void setResponse(Object response) {
       this.response = response;
   }

   @Override
   protected void initChannel(SocketChannel ch) {
       ChannelPipeline pipeline = ch.pipeline();
       pipeline.addLast(new LengthFieldPrepender(2));
       pipeline.addLast(new LengthFieldBasedFrameDecoder(1024 * 1024, 0, 2, 0, 2));
       pipeline.addLast(new ObjectCodec());
       pipeline.addLast(new ClientChannelHandlerAdapter(methodInvokeMeta, this));
   }

    }

    4. RPCProxyFactoryBean.java

    import com.edu.hart.rpc.entity.MethodInvokeMeta;
    import com.edu.hart.rpc.util.WrapMethodUtils;
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    import org.springframework.beans.factory.config.AbstractFactoryBean;

    import java.lang.reflect.InvocationHandler;
    import java.lang.reflect.Method;
    import java.lang.reflect.Proxy;

    /**
    * Created by 叶云轩 on 2017/6/16-17:16
    * Concat tdg_yyx@foxmail.com
    */
    public class RPCProxyFactoryBean extends AbstractFactoryBean implements InvocationHandler {
    private Logger logger = LoggerFactory.getLogger(RPCProxyFactoryBean.class);

       private Class interfaceClass;

   private NettyClient nettyClient;

   @Override
   public Class<?> getObjectType() {
       return interfaceClass;
   }

   @Override
   protected Object createInstance() throws Exception {
       logger.info("[代理工厂] 初始化代理Bean : {}", interfaceClass);
       return Proxy.newProxyInstance(interfaceClass.getClassLoader(), new Class[]{interfaceClass}, this);
   }

   @Override
   public Object invoke(Object proxy, Method method, Object[] args) {
       final MethodInvokeMeta methodInvokeMeta = WrapMethodUtils.readMethod(interfaceClass, method, args);
       if (!methodInvokeMeta.getMethodName().equals("toString")) {
           logger.info("[invoke] 调用接口{},调用方法名：{}，入参：{},参数类型：{}，返回值类型{}",
                   methodInvokeMeta.getInterfaceClass(), methodInvokeMeta.getMethodName()
                   , methodInvokeMeta.getArgs(), methodInvokeMeta.getParameterTypes(), methodInvokeMeta.getReturnType());
       }
       return nettyClient.remoteCall(methodInvokeMeta, 0);
   }

   public void setInterfaceClass(Class interfaceClass) {
       this.interfaceClass = interfaceClass;
   }

   public void setNettyClient(NettyClient nettyClient) {
       this.nettyClient = nettyClient;
   }

    }

    
   至此，netty-client与SpringBoot的集成了算完毕了。同样 ，在netty-client中也要加入相应的依赖

   不过上面server与client使用了一些公共的类和工具。下面也给列举中出来。

###### MethodInvokeMeta.java

    import org.springframework.stereotype.Component;

    import java.io.Serializable;

    /**
    * 记录调用方法的元信息
    * Created by 叶云轩 on 2017/6/7-15:41
    * Concat tdg_yyx@foxmail.com
    */
    @Component
    public class MethodInvokeMeta implements Serializable {

       private static final long serialVersionUID = 8379109667714148890L;
   //接口
   private Class<?> interfaceClass;
   //方法名
   private String methodName;
   //参数
   private Object[] args;
   //返回值类型
   private Class<?> returnType;
   //参数类型
   private Class<?>[] parameterTypes;

   public Object[] getArgs() {
       return args;
   }

   public void setArgs(Object[] args) {
       this.args = args;
   }

   public Class<?> getInterfaceClass() {
       return interfaceClass;
   }

   public void setInterfaceClass(Class<?> interfaceClass) {
       this.interfaceClass = interfaceClass;
   }

   public String getMethodName() {
       return methodName;
   }

   public void setMethodName(String methodName) {
       this.methodName = methodName;
   }

   public Class[] getParameterTypes() {
       return parameterTypes;
   }

   public void setParameterTypes(Class<?>[] parameterTypes) {
       this.parameterTypes = parameterTypes;
   }

   public Class getReturnType() {
       return returnType;
   }

   public void setReturnType(Class returnType) {
       this.returnType = returnType;
   }

    }

    
###### NullWritable.java

    import java.io.Serializable;

    /**
    * 服务器可能返回空的处理
    * Created by 叶云轩 on 2017/6/16-16:46
    * Concat tdg_yyx@foxmail.com
    */
    public class NullWritable implements Serializable {

       private static final long serialVersionUID = -8191640400484155111L;
   private static NullWritable instance = new NullWritable();

   private NullWritable() {
   }

   public static NullWritable nullWritable() {
       return instance;
   }

    }

    
###### ObjectCodec.java

    import io.netty.buffer.ByteBuf;
    import io.netty.buffer.Unpooled;
    import io.netty.channel.ChannelHandlerContext;
    import io.netty.handler.codec.MessageToMessageCodec;

    import java.util.List;

    public class ObjectCodec extends MessageToMessageCodec<ByteBuf, Object> {

       @Override
   protected void encode(ChannelHandlerContext ctx, Object msg, List<Object> out) {
       byte[] data = ObjectSerializerUtils.serilizer(msg);
       ByteBuf buf = Unpooled.buffer();
       buf.writeBytes(data);
       out.add(buf);
   }

   @Override
   protected void decode(ChannelHandlerContext ctx, ByteBuf msg, List<Object> out) {
       byte[] bytes = new byte[msg.readableBytes()];
       msg.readBytes(bytes);
       Object deSerilizer = ObjectSerializerUtils.deSerilizer(bytes);
       out.add(deSerilizer);
   }

    }

    
###### ObjectSerializerUtils.java

    package com.edu.hart.rpc.util;

    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;

    import java.io.*;

    /**
    * 对象序列化工具
    */
    public class ObjectSerializerUtils {

       private static final Logger logger = LoggerFactory.getLogger(ObjectSerializerUtils.class);

   /**
    * 反序列化
    *
    * @param data
    * @return
    */
   public static Object deSerilizer(byte[] data) {
       if (data != null && data.length > 0) {
           try {
               ByteArrayInputStream bis = new ByteArrayInputStream(data);
               ObjectInputStream ois = new ObjectInputStream(bis);
               return ois.readObject();
           } catch (Exception e) {
               logger.info("[异常信息] {}", e.getMessage());
               e.printStackTrace();
           }
           return null;
       } else {
           logger.info("[反序列化] 入参为空");
           return null;
       }
   }

   /**
    * 序列化对象
    *
    * @param obj
    * @return
    */
   public static byte[] serilizer(Object obj) {
       if (obj != null) {
           try {
               ByteArrayOutputStream bos = new ByteArrayOutputStream();
               ObjectOutputStream oos = new ObjectOutputStream(bos);
               oos.writeObject(obj);
               oos.flush();
               oos.close();
               return bos.toByteArray();
           } catch (IOException e) {
               e.printStackTrace();
           }
           return null;
       } else {
           return null;
       }
   }

    }

    
   下面主要是用于Client端的：

###### NettyBeanSacnner.java

    import com.edu.hart.rpc.client.RPCProxyFactoryBean;
    import org.springframework.beans.BeansException;
    import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
    import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
    import org.springframework.beans.factory.support.BeanDefinitionBuilder;
    import org.springframework.beans.factory.support.DefaultListableBeanFactory;

    import java.util.List;

    /**
    * 动态加载代理bean到Spring bean工厂
    */
    public class NettyBeanScanner implements BeanFactoryPostProcessor {

       private DefaultListableBeanFactory beanFactory;

   private String basePackage;

   private String clientName;

   public NettyBeanScanner(String basePackage, String clientName) {
       this.basePackage = basePackage;
       this.clientName = clientName;
   }


   /**
    * 注册Bean到Spring的bean工厂
    */
   public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
       this.beanFactory = (DefaultListableBeanFactory) beanFactory;
       // 加载远程服务的接口
       List<String> resolverClass = PackageClassUtils.resolver(basePackage);
       for (String clazz : resolverClass) {
           String simpleName;
           if (clazz.lastIndexOf('.') != -1) {
               simpleName = clazz.substring(clazz.lastIndexOf('.') + 1);
           } else {
               simpleName = clazz;
           }
           BeanDefinitionBuilder gd = BeanDefinitionBuilder.genericBeanDefinition(RPCProxyFactoryBean.class);
           gd.addPropertyValue("interfaceClass", clazz);
           gd.addPropertyReference("nettyClient", clientName);
           this.beanFactory.registerBeanDefinition(simpleName, gd.getRawBeanDefinition());
       }
   }

    }

    
###### PackageClassUtils.java

   **这个类要说一下，主要是用来加载Server对应的接口的。因为在Client中RPC接口没有实现类，所以要自己将这些接口加载到Spring工厂里面。但是现在有个问题就是需要使用**

###### SpringBoot中application.yml

    basePackage: com.edu.hart.rpc.service.login;com.edu.hart.rpc.service.employee;com.edu.hart.rpc.service.authorization;

    
   **这样的方式来加载，使用通配符的时候会加载不到，这个问题我还没有解决。**

    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;

    import java.io.File;
    import java.util.ArrayList;
    import java.util.List;

    /**
    * 字节文件加载
    */
    public class PackageClassUtils {

       private final static Logger LOGGER = LoggerFactory.getLogger(PackageClassUtils.class);

   /**
    * 解析包参数
    *
    * @param basePackage 包名
    * @return 包名字符串集合
    */
   public static List<String> resolver(String basePackage) {
       //以";"分割开多个包名
       String[] splitFHs = basePackage.split(";");
       List<String> classStrs = new ArrayList<>();
       //s: com.yyx.util.*
       for (String s : splitFHs) {
           LOGGER.info("[加载类目录] {}", s);
           //路径中是否存在".*" com.yyx.util.*
           boolean contains = s.contains(".*");
           if (contains) {
               //截断星号  com.yyx.util
               String filePathStr = s.substring(0, s.lastIndexOf(".*"));
               //组装路径 com/yyx/util
               String filePath = filePathStr.replaceAll("\.", "/");
               //获取路径 xxx/classes/com/yyx/util
               File file = new File(PackageClassUtils.class.getResource("/").getPath() + "/" + filePath);
               //获取目录下获取文件
               getAllFile(filePathStr, file, classStrs);
           } else {
               String filePath = s.replaceAll("\.", "/");
               File file = new File(PackageClassUtils.class.getResource("/").getPath() + "/" + filePath);
               classStrs = getClassReferenceList(classStrs, file, s);
           }
       }
       return classStrs;
   }

   /**
    * 添加全限定类名到集合
    *
    * @param classStrs 集合
    * @return 类名集合
    */
   private static List<String> getClassReferenceList(List<String> classStrs, File file, String s) {
       File[] listFiles = file.listFiles();
       if (listFiles != null && listFiles.length != 0) {
           for (File file2 : listFiles) {
               if (file2.isFile()) {
                   String name = file2.getName();
                   String fileName = s + "." + name.substring(0, name.lastIndexOf('.'));
                   LOGGER.info("[加载完成] 类文件：{}", fileName);
                   classStrs.add(fileName);
               }
           }
       }
       return classStrs;
   }


   /**
    * 获取一个目录下的所有文件
    *
    * @param s
    * @param file
    * @param classStrs
    */
   private static void getAllFile(String s, File file, List<String> classStrs) {
       if (file.isDirectory()) {
           File[] files = file.listFiles();
           if (files != null)
               for (File file1 : files) {
                   getAllFile(s, file1, classStrs);
               }
       } else {
           String path = file.getPath();
           String cleanPath = path.replaceAll("/", ".");
           String fileName = cleanPath.substring(cleanPath.indexOf(s), cleanPath.length());
           LOGGER.info("[加载完成] 类文件：{}", fileName);
           classStrs.add(fileName);
       }
   }

    }

    
###### RemoteMethodInvokeUtil.java

    import com.edu.hart.rpc.entity.MethodInvokeMeta;
    import org.springframework.beans.BeansException;
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.ApplicationContextAware;

    import java.lang.reflect.InvocationTargetException;
    import java.lang.reflect.Method;

    /**
    * 消息处理类
    * Created by 叶云轩 on 2017/6/7-15:49
    * Concat tdg_yyx@foxmail.com
    */
    public class RemoteMethodInvokeUtil implements ApplicationContextAware {

       private ApplicationContext applicationContext;

   public Object processMethod(MethodInvokeMeta methodInvokeMeta) throws InvocationTargetException, IllegalAccessException {
       Class interfaceClass = methodInvokeMeta.getInterfaceClass();
       Object bean = applicationContext.getBean(interfaceClass);
       Method[] declaredMethods = interfaceClass.getDeclaredMethods();
       Method method = null;
       for (Method declaredMethod : declaredMethods) {
           if (methodInvokeMeta.getMethodName().equals(declaredMethod.getName())) {
               method = declaredMethod;
           }
       }
       Object invoke = method.invoke(bean, methodInvokeMeta.getArgs());
       return invoke;
   }

   @Override
   public void setApplicationContext(ApplicationContext app) throws BeansException {
       applicationContext = app;
   }

    }

    
###### WrapMethodUtils.java

    import com.edu.hart.rpc.entity.MethodInvokeMeta;

    import java.lang.reflect.Method;

    public class WrapMethodUtils {
    /**
    * 获取 method的元数据信息
    *
    * @param interfaceClass
    * @param method
    * @param args
    * @return
    */
    public static MethodInvokeMeta readMethod(Class interfaceClass, Method method, Object[] args) {
    MethodInvokeMeta mim = new MethodInvokeMeta();
    mim.setInterfaceClass(interfaceClass);
    mim.setArgs(args);
    mim.setMethodName(method.getName());
    mim.setReturnType(method.getReturnType());
    Class<?>[] parameterTypes = method.getParameterTypes();
    mim.setParameterTypes(parameterTypes);
    return mim;
    }
    }

    
------

下面的这些类我也会用在与前台通信时使用：

###### ResponseEnum.java

    import java.io.Serializable;

    /**

    • 响应码枚举类

    • Created by 叶云轩 on 2017/6/13-11:53

    • Concat tdg_yyx@foxmail.com
      */
      public enum ResponseCodeEnum implements Serializable {

      // region authentication code
      REQUEST_SUCCESS(10000, "请求成功"),
      SERVER_ERROR(99999, "服务器内部错误"),;

      //region 提供对外访问的方法,无需更改
      /**

      • 响应码
        /
        private Integer code;
        /        *
      • 响应信息
        */
        private String msg;

      ResponseCodeEnum(Integer code, String msg) {
      this.code = code;
      this.msg = msg;
      }

      public Integer getCode() {
      return code;
      }

      public String getMsg() {
      return msg;
      }

      //endregion
      }

    
###### ResponseResult.java

    import java.io.Serializable;

    /**

    • 数据返回实体封装

    • Created by 叶云轩 on 2017/6/13-11:38

    • Concat tdg_yyx@foxmail.com

    • @param 通用变量
      */
      public class ResponseResult implements Serializable {

      private static final long serialVersionUID = -3411174924856108156L;
      /**

      • 服务器响应码
        /
        private Integer code;
        /        *
      • 服务器响应说明
        /
        private String msg;
        /        *
      • 服务器响应数据
        */
        private T data;

      public ResponseResult() {

      }

      @Override
      public boolean equals(Object o) {
      if (this == o) return true;
      if (o == null || getClass() != o.getClass()) return false;

       ResponseResult<?> that = (ResponseResult<?>) o;

 return (code != null ? code.equals(that.code) : that.code == null) && (msg != null ? msg.equals(that.msg) : that.msg == null) && (data != null ? data.equals(that.data) : that.data == null);

      }

      public Integer getCode() {

       return code;

      }

      public void setCode(Integer code) {
      this.code = code;
      }

      public T getData() {
      return data;
      }

      public void setData(T data) {
      this.data = data;
      }

      public String getMsg() {
      return msg;
      }

      public void setMsg(String msg) {
      this.msg = msg;
      }

      @Override
      public int hashCode() {
      int result = code != null ? code.hashCode() : 0;
      result = 31 * result
      + (msg != null ? msg.hashCode() : 0);
      result = 31 * result + (data != null ? data.hashCode() : 0);
      return result;
      }

      @Override
      public String toString() {
      return "ResponseResult{"
      + "code="
      + code
      + ", msg='"
      + msg
      + '''
      + ", data="
      + data
      + '}';
      }
      }

    
###### ResponseResultUtil.java

    import com.edu.hart.modules.communicate.ResponseCodeEnum;
    import com.edu.hart.modules.communicate.ResponseResult;

    /**

    • 返回结果工具类

    • Created by 叶云轩 on 2017/5/29-10:37

    • Concat tdg_yyx@foxmail.com
      */
      public class ResponseResultUtil {

      /**

      • 请求失败返回的数据结构
      • @param responseCodeEnum 返回信息枚举类
      • @return 结果集
        */
        public static ResponseResult error(ResponseCodeEnum responseCodeEnum) {
        ResponseResult ResponseResult = new ResponseResult();
        ResponseResult.setMsg(responseCodeEnum.getMsg());
        ResponseResult.setCode(responseCodeEnum.getCode());
        ResponseResult.setData(null);
        return ResponseResult;
        }

      /**

      • 没有结果集的返回数据结构
      • @return 结果集
        */
        public static ResponseResult success() {
        return success(null);
        }

      /**

      • 成功返回数据结构
      • @param o 返回数据对象
      • @return 返回结果集
        */
        public static ResponseResult success(Object o) {
        ResponseResult responseResult = new ResponseResult();
        responseResult.setMsg(ResponseCodeEnum.REQUEST_SUCCESS.getMsg());
        responseResult.setCode(ResponseCodeEnum.REQUEST_SUCCESS.getCode());
        responseResult.setData(o);
        return responseResult;
        }

      /**

      • 判断是否成功
      • @param responseResult 请求结果
      • @return 判断结果
        */
        public static boolean judgementSuccess(ResponseResult responseResult) {
        return responseResult.getCode().equals(ResponseCodeEnum.REQUEST_SUCCESS.getCode());
        }
        }
    
来，我们测试一下远程通信：

1. Client调用Server的一个接口。可以看到在hart-oa项目中，RPCEmployeeService没有任何实现类，控制台中打印了方法的调用 以及入参信息

![Client调用Server的一个接口](http://images2017.cnblogs.com/blog/1161505/201801/1161505-20180129131759375-896850881.png)

1. Server断点监听到远程调用，CloudApplication项目为Server端，我们可以看到接收到来自hart-oa的一个请求，参数一致。在CloudApplication中进行相应的处理后，返回到Client(hart-oa)

![Server断点监听到远程调用 ](http://images2017.cnblogs.com/blog/1161505/201801/1161505-20180129131759531-1793044895.png)

1. 返回信息到Client，可以看到我们（hart-oa）收到了来自CloudApplication的响应，结果是我们封装好的ResponseResult.

![返回信息到Client](http://images2017.cnblogs.com/blog/1161505/201801/1161505-20180129131804968-429317475.png)

------

嗯 ～至此整合测试完成。要有想知道与Spring整合的，也可以留言或者邮箱：tdg_yyx@foxmail.com给我～～～

若是想学习Netty的，对上面 代码看不懂的也可以留言或者邮箱：tdg_yyx@foxmail.com给我～～～
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  • 原文地址：https://www.cnblogs.com/tdg-yyx/p/8376842.html
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