网络编程 -- RPC实现原理 -- RPC -- 迭代版本V3 -- 远程方法调用整合 Spring

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网络编程 -- RPC实现原理 -- RPC -- 迭代版本V3 -- 远程方法调用整合 Spring

2024-10-11 18:01:02 215人阅读

网络编程 -- RPC实现原理 -- 目录

　　啦啦啦

V3——RPC -- 远程方法调用及 null的传输 + Spring

　　服务提供商：

　　　　1. 配置 rpc03_server.xml 注入服务提供商 rpcServiceProvider并指定初始化方法及服务实例 IUserService

　　　　2. 读取服务消费者请求的 MethodStaics ，通过反射获取服务端实例方法的返回值。返回值为null值，则映射为NullWritable实例返回。不为null，则不加以约束。

　　服务代理商：

　　　　1. 配置 rpc03_client.xml 注入服务代理商 RPCObjectProxy并指定目标对象 RPCClient 及代理的接口 lime.pri.limeNio.netty.rpc03.service.IUserService

　　　　2. List<User> users = userService.queryAll(10, 4); ：调用目标对象的 Object invokeMethod(MethodStaics methodStaics); 方法，通过TCP/IP将MethodStaics实例发送至服务提供商。

　　　　3. 读取服务提供商返回值。返回值为NullWritable实例，则映射为null值。其他实例，则不加以约束。

服务提供商：

　　XML ： rpc03_server.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:p="http://www.springframework.org/schema/p"
    xsi:schemaLocation="   
          http://www.springframework.org/schema/beans 
          classpath:/org/springframework/beans/factory/xml/spring-beans-4.1.xsd 
          http://www.springframework.org/schema/context 
          classpath:/org/springframework/context/config/spring-context-4.1.xsd 
          http://mybatis.org/schema/mybatis-spring 
          http://mybatis.org/schema/mybatis-spring.xsd 
          http://www.springframework.org/schema/aop 
          classpath:org/springframework/aop/config/spring-aop-4.1.xsd"
    default-lazy-init="false">

    <bean id="rpcServiceProvider" class="lime.pri.limeNio.netty.rpc03.core.server.RPCServiceProvider"
        init-method="start" destroy-method="close">
        <constructor-arg index="0" value="http://www.mamicode.com/9999" />
    </bean>

    <bean id="IUserService" class="lime.pri.limeNio.netty.rpc03.service.impl.UserService" />

</beans>

　　Class ： RPCServiceProvider 实现ApplicationContextAware 获取通过容器的getBean()方法获取服务实例

package lime.pri.limeNio.netty.rpc03.core.server;

import java.lang.reflect.Method;
import java.util.List;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.serializer.SerializerFeature;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerAdapter;
import io.netty.channel.ChannelHandlerContext;
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 io.netty.handler.codec.MessageToMessageCodec;
import io.netty.util.CharsetUtil;
import lime.pri.limeNio.netty.rpc03.core.assist.MethodStaics;
import lime.pri.limeNio.netty.rpc03.core.assist.NullWritable;

public class RPCServiceProvider implements ApplicationContextAware {

    private ServerBootstrap serverBootstrap;
    private EventLoopGroup boss;
    private EventLoopGroup worker;
    private int port;

    private ApplicationContext act;

    public RPCServiceProvider() {
        super();
    }

    public RPCServiceProvider(int port) {
        this.serverBootstrap = new ServerBootstrap();
        this.boss = new NioEventLoopGroup();
        this.worker = new NioEventLoopGroup();
        this.serverBootstrap.group(boss, worker);
        this.serverBootstrap.channel(NioServerSocketChannel.class);
        this.port = port;
    }

    public void start() {
        serverBootstrap.childHandler(new ChannelInitializer<SocketChannel>() {

            @Override
            protected void initChannel(SocketChannel ch) throws Exception {
                ChannelPipeline pipeline = ch.pipeline();
                pipeline.addLast(new LengthFieldPrepender(2))
                        .addLast(new LengthFieldBasedFrameDecoder(65535, 0, 2, 0, 2))
                        .addLast(new MessageToMessageCodec<ByteBuf, Object>() {
                            @Override
                            protected void encode(ChannelHandlerContext ctx, Object msg, List<Object> out)
                                    throws Exception {
                                out.add(Unpooled.buffer()
                                        .writeBytes(JSON.toJSONString(msg, SerializerFeature.WriteClassName)
                                                .getBytes(CharsetUtil.UTF_8)));
                            }

                            @Override
                            protected void decode(ChannelHandlerContext ctx, ByteBuf msg, List<Object> out)
                                    throws Exception {
                                out.add(JSON.parse(msg.toString(CharsetUtil.UTF_8)));
                            }
                        }).addLast(new ChannelHandlerAdapter() {
                            @Override
                            public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
                                MethodStaics methodStaics = (MethodStaics) msg;
                                Object bean = act.getBean(methodStaics.getTargetInterface().getSimpleName());
                                Method method = bean.getClass().getDeclaredMethod(methodStaics.getMethod(),
                                        methodStaics.getParameterTypes());
                                Object invoke = method.invoke(bean, methodStaics.getArgs());
                                // 如果返回值为空，则返回NullWritable实例代替传输
                                invoke = null == invoke ? new NullWritable() : invoke;
                                ChannelFuture channelFuture = ctx.writeAndFlush(invoke);
                                channelFuture.addListener(ChannelFutureListener.FIRE_EXCEPTION_ON_FAILURE);
                                channelFuture.addListener(ChannelFutureListener.CLOSE_ON_FAILURE);
                                channelFuture.addListener(ChannelFutureListener.CLOSE);
                            }

                            @Override
                            public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
                                System.err.println(cause);
                            }
                        });
            }
        });
        /**
         * 绑定监听端口并启动服务 注意 ： 启动的服务是阻塞的，防止阻塞Spring工厂需要采用异步启动
         */
        new Thread() {
            public void run() {
                try {
                    System.out.println("服务启动@" + port + " ...");
                    ChannelFuture channelFuture = serverBootstrap.bind(port).sync();
                    channelFuture.channel().closeFuture().sync();
                } catch (InterruptedException e) {
                    System.out.println(e);
                } finally {
                }

            };
        }.start();
    }

    public void close() {
        boss.shutdownGracefully();
        worker.shutdownGracefully();
    }

    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.act = applicationContext;
    }
}

　　Class ： IUserService

package lime.pri.limeNio.netty.rpc03.service;

import java.util.List;

import lime.pri.limeNio.netty.rpc03.entity.User;

public interface IUserService {

    User queryById(Integer id);

    List<User> queryByName(String name);
    
    List<User> queryAll(Integer pageSize, Integer pageNum);
}

　　Class ： UserService

package lime.pri.limeNio.netty.rpc03.service.impl;

import java.util.ArrayList;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import lime.pri.limeNio.netty.rpc03.entity.User;
import lime.pri.limeNio.netty.rpc03.service.IUserService;

public class UserService implements IUserService {

    private static Map<Integer, User> userMap = new ConcurrentHashMap<Integer, User>();

    static {
        for (int i = 1; i <= 100; i++) {
            userMap.put(i, new User(i, "lime_" + i, new Date()));
        }
    }

    public User queryById(Integer id) {
        return userMap.get(id);
    }

    public List<User> queryAll(Integer pageSize, Integer pageNum) {
        int stNum = (pageNum - 1) * pageSize + 1;
        int enNum = pageNum * pageSize;
        List<User> result = new ArrayList<User>();
        for (int i = stNum; i <= enNum; i++) {
            result.add(userMap.get(i));
        }
        return result;
    }

    public List<User> queryByName(String name) {
        List<User> result = null;
        Iterator<User> iterator = userMap.values().iterator();
        while (iterator.hasNext()) {
            User user = iterator.next();
            if (user.getName().equals(name)) {
                if (null == result)
                    result = new ArrayList<User>();
                result.add(user);
            }
        }
        return result;
    }

}

服务代理商：

　　Class ：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:p="http://www.springframework.org/schema/p"
    xsi:schemaLocation="   
          http://www.springframework.org/schema/beans 
          classpath:/org/springframework/beans/factory/xml/spring-beans-4.1.xsd 
          http://www.springframework.org/schema/context 
          classpath:/org/springframework/context/config/spring-context-4.1.xsd 
          http://mybatis.org/schema/mybatis-spring 
          http://mybatis.org/schema/mybatis-spring.xsd 
          http://www.springframework.org/schema/aop 
          classpath:org/springframework/aop/config/spring-aop-4.1.xsd"
    default-lazy-init="false">

    <bean id="userService" class="lime.pri.limeNio.netty.rpc03.core.client.proxy.RPCObjectProxy">
        <constructor-arg index="0" ref="rpcClient" />
        <constructor-arg index="1" value="http://www.mamicode.com/lime.pri.limeNio.netty.rpc03.service.IUserService" />
    </bean>

    <bean id="rpcClient" class="lime.pri.limeNio.netty.rpc03.core.client.impl.RemoteRPCClient"
        destroy-method="close">
        <constructor-arg index="0" ref="hostAndPort" />
    </bean>

    <bean id="hostAndPort" class="lime.pri.limeNio.netty.rpc03.core.client.assist.HostAndPort">
        <constructor-arg index="0" value="http://www.mamicode.com/127.0.0.1" />
        <constructor-arg index="1" value="http://www.mamicode.com/9999" />
    </bean>

</beans>

　　Class ： RPCObjectProxy

package lime.pri.limeNio.netty.rpc03.core.client.proxy;


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

import org.springframework.beans.factory.FactoryBean;

import lime.pri.limeNio.netty.rpc03.core.assist.MethodStaics;
import lime.pri.limeNio.netty.rpc03.core.client.rpcClient.RPCClient;

/**
 * 通过接口动态创建代理对象
 * 
 * @author lime
 * @param <T>
 *
 *            实现FactoryBean接口，与Spring整合
 * 
 */
public class RPCObjectProxy implements InvocationHandler, FactoryBean<Object> {

    private RPCClient rpcClient;
    private Class<?> targetInterface;

    public RPCObjectProxy() {
        super();
    }

    public RPCObjectProxy(RPCClient rpcClient, Class<?> targetInterface) {
        super();
        this.rpcClient = rpcClient;
        this.targetInterface = targetInterface;
    }

    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        return rpcClient
                .invokeMethod(new MethodStaics(targetInterface, method.getName(), args, method.getParameterTypes()));
    }

    // 产生代理对象
    public Object getObject() throws Exception {
        return Proxy.newProxyInstance(RPCObjectProxy.class.getClassLoader(), new Class[] { targetInterface }, this);

    }

    public Class<?> getObjectType() {
        return targetInterface;
    }

    public boolean isSingleton() {
        return true;
    }
}

　　Class ： RPCClient

package lime.pri.limeNio.netty.rpc03.core.client.rpcClient;

import lime.pri.limeNio.netty.rpc03.core.assist.MethodStaics;

/**
 * 通过RPCClient实现对远程方法的调用
 * 
 * @author lime
 *
 */
public interface RPCClient {

    Object invokeMethod(MethodStaics methodStaics);

    void close();
}

　　Class ： RemoteRPCClient

package lime.pri.limeNio.netty.rpc03.core.client.rpcClient.impl;

import java.net.InetSocketAddress;
import java.util.List;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.serializer.SerializerFeature;

import io.netty.bootstrap.Bootstrap;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerAdapter;
import io.netty.channel.ChannelHandlerContext;
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.NioSocketChannel;
import io.netty.handler.codec.LengthFieldBasedFrameDecoder;
import io.netty.handler.codec.LengthFieldPrepender;
import io.netty.handler.codec.MessageToMessageCodec;
import io.netty.util.CharsetUtil;
import lime.pri.limeNio.netty.rpc03.core.assist.MethodStaics;
import lime.pri.limeNio.netty.rpc03.core.assist.NullWritable;
import lime.pri.limeNio.netty.rpc03.core.client.assist.HostAndPort;
import lime.pri.limeNio.netty.rpc03.core.client.rpcClient.RPCClient;

/**
 * 通过TCP/IP协议实现远程方法调用
 * 
 * @author lime
 *
 */
public class RemoteRPCClient implements RPCClient {

    private Bootstrap bootstrap;
    private EventLoopGroup worker;
    private HostAndPort hostAndPort;

    public RemoteRPCClient() {
        super();
    }

    public RemoteRPCClient(HostAndPort hostAndPost) {
        this.hostAndPort = hostAndPost;
        // 初始化数据
        this.bootstrap = new Bootstrap();
        this.worker = new NioEventLoopGroup();
        this.bootstrap.group(this.worker);
        this.bootstrap.channel(NioSocketChannel.class);
    }

    public Object invokeMethod(final MethodStaics methodStaics) {
        bootstrap.handler(new ChannelInitializer<SocketChannel>() {
            @Override
            protected void initChannel(SocketChannel ch) throws Exception {
                ChannelPipeline pipeline = ch.pipeline();
                pipeline.addLast(new LengthFieldBasedFrameDecoder(65535, 0, 2, 0, 2))
                        .addLast(new LengthFieldPrepender(2)).addLast(new MessageToMessageCodec<ByteBuf, Object>() {
                            @Override
                            protected void encode(ChannelHandlerContext ctx, Object msg, List<Object> out)
                                    throws Exception {
                                out.add(Unpooled.buffer()
                                        .writeBytes(JSON.toJSONString(msg, SerializerFeature.WriteClassName)
                                                .getBytes(CharsetUtil.UTF_8)));
                            }

                            @Override
                            protected void decode(ChannelHandlerContext ctx, ByteBuf msg, List<Object> out)
                                    throws Exception {
                                out.add(JSON.parse(msg.toString(CharsetUtil.UTF_8)));
                            }
                        }).addLast(new ChannelHandlerAdapter() {
                            @Override
                            public void channelActive(ChannelHandlerContext ctx) throws Exception {
                                ChannelFuture channelFuture = ctx.writeAndFlush(methodStaics);
                                channelFuture.addListener(ChannelFutureListener.FIRE_EXCEPTION_ON_FAILURE);
                                channelFuture.addListener(ChannelFutureListener.CLOSE_ON_FAILURE);
                            }

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

                            @Override
                            public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
                                System.err.println(cause);
                            }
                        });
            }
        });
        ChannelFuture channelFuture;
        try {
            channelFuture = bootstrap.connect(new InetSocketAddress(hostAndPort.getHost(), hostAndPort.getPort()))
                    .sync();
            channelFuture.channel().closeFuture().sync();
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        // 服务端返回值为null，处理方式
        return methodStaics.getResult() instanceof NullWritable ? null : methodStaics.getResult();
    }

    public void close() {
        worker.shutdownGracefully();
    }

}

　　Class ： HostAndPort

package lime.pri.limeNio.netty.rpc03.core.client.assist;

import java.io.Serializable;

public class HostAndPort implements Serializable{

    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    
    private String host;
    private int port;
    public HostAndPort() {
        super();
        // TODO Auto-generated constructor stub
    }
    public HostAndPort(String host, int port) {
        super();
        this.host = host;
        this.port = port;
    }
    public String getHost() {
        return host;
    }
    public void setHost(String host) {
        this.host = host;
    }
    public int getPort() {
        return port;
    }
    public void setPort(int port) {
        this.port = port;
    }
    @Override
    public String toString() {
        return "HostAndPort [host=" + host + ", port=" + port + "]";
    }
    

}

辅助类：

　　Class ： MethodStaics

package lime.pri.limeNio.netty.rpc03.core.assist;

import java.io.Serializable;
import java.util.Arrays;

/**
 * @author lime
 *
 */
public class MethodStaics implements Serializable{

    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    private Class<?> targetInterface;
    private String method;
    private Object[] args;
    private Class[] parameterTypes;
    private Object result;
    public MethodStaics() {
        super();
        // TODO Auto-generated constructor stub
    }
    public MethodStaics(Class<?> targetInterface, String method, Object[] args, Class[] parameterTypes) {
        super();
        this.targetInterface = targetInterface;
        this.method = method;
        this.args = args;
        this.parameterTypes = parameterTypes;
    }
    @Override
    public String toString() {
        return "MethodStaics [targetInterface=" + targetInterface + ", method=" + method + ", args="
                + Arrays.toString(args) + ", parameterTypes=" + Arrays.toString(parameterTypes) + "]";
    }
    public Class<?> getTargetInterface() {
        return targetInterface;
    }
    public void setTargetInterface(Class<?> targetInterface) {
        this.targetInterface = targetInterface;
    }
    public String getMethod() {
        return method;
    }
    public void setMethod(String method) {
        this.method = method;
    }
    public Object[] getArgs() {
        return args;
    }
    public void setArgs(Object[] args) {
        this.args = args;
    }
    public Class[] getParameterTypes() {
        return parameterTypes;
    }
    public void setParameterTypes(Class[] parameterTypes) {
        this.parameterTypes = parameterTypes;
    }
    public Object getResult() {
        return result;
    }
    public void setResult(Object result) {
        this.result = result;
    }

}

　　Class ： NullWritable

package lime.pri.limeNio.netty.rpc03.core.assist;

import java.io.Serializable;

public class NullWritable implements Serializable{

    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    

}

　　Class ： User

package lime.pri.limeNio.netty.rpc03.entity;

import java.io.Serializable;
import java.util.Date;

public class User implements Serializable {

    /**
     * 
     */
    private static final long serialVersionUID = 1L;

    private int id;
    private String name;
    private Date birth;

    public User() {
        super();
        // TODO Auto-generated constructor stub
    }

    public User(int id, String name, Date birth) {
        super();
        this.id = id;
        this.name = name;
        this.birth = birth;
    }

    @Override
    public String toString() {
        return "User [id=" + id + ", name=" + name + ", birth=" + birth + "]";
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Date getBirth() {
        return birth;
    }

    public void setBirth(Date birth) {
        this.birth = birth;
    }

}

测试类：

　　Class ： TtServer

package lime.pri.limeNio.netty.rpc03.tT;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class TtServer {

    public static void main(String[] args) throws Exception {
        new ClassPathXmlApplicationContext("classpath:spring/rpc03_server.xml");
    }
}

　　Class ： TtClient

package lime.pri.limeNio.netty.rpc03.tT;

import java.util.List;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import lime.pri.limeNio.netty.rpc03.entity.User;
import lime.pri.limeNio.netty.rpc03.service.IUserService;

public class TtClient {

    public static void main(String[] args) throws Exception {
        ApplicationContext ctx = new ClassPathXmlApplicationContext("classpath:spring/rpc03_client.xml");
        IUserService userService = (IUserService) ctx.getBean("userService");

        System.out.println("queryByName");
        List<User> usersWithName = userService.queryByName("lime");
        System.out.println(usersWithName);
        System.out.println("queryAll");
        List<User> users = userService.queryAll(10, 3);
        for (User user : users) {
            System.out.println(user);
        }
        System.out.println("queryById");
        User user = userService.queryById(23);
        System.out.println(user);
    }
}

　　Console ： Server

六月 25, 2017 2:08:04 下午 org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh
信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@17f052a3: startup date [Sun Jun 25 14:08:04 CST 2017]; root of context hierarchy
六月 25, 2017 2:08:04 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
信息: Loading XML bean definitions from class path resource [spring/rpc03_server.xml]
服务启动@9999 ...

　　Console ： Client

六月 25, 2017 2:08:18 下午 org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh
信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@17f052a3: startup date [Sun Jun 25 14:08:18 CST 2017]; root of context hierarchy
六月 25, 2017 2:08:18 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
信息: Loading XML bean definitions from class path resource [spring/rpc03_client.xml]
queryByName
null
queryAll
User [id=21, name=lime_21, birth=Sun Jun 25 14:08:04 CST 2017]
User [id=22, name=lime_22, birth=Sun Jun 25 14:08:04 CST 2017]
User [id=23, name=lime_23, birth=Sun Jun 25 14:08:04 CST 2017]
User [id=24, name=lime_24, birth=Sun Jun 25 14:08:04 CST 2017]
User [id=25, name=lime_25, birth=Sun Jun 25 14:08:04 CST 2017]
User [id=26, name=lime_26, birth=Sun Jun 25 14:08:04 CST 2017]
User [id=27, name=lime_27, birth=Sun Jun 25 14:08:04 CST 2017]
User [id=28, name=lime_28, birth=Sun Jun 25 14:08:04 CST 2017]
User [id=29, name=lime_29, birth=Sun Jun 25 14:08:04 CST 2017]
User [id=30, name=lime_30, birth=Sun Jun 25 14:08:04 CST 2017]
queryById
User [id=23, name=lime_23, birth=Sun Jun 25 14:08:04 CST 2017]

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网络编程 -- RPC实现原理 -- RPC -- 迭代版本V3 -- 远程方法调用整合 Spring

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网络编程 -- RPC实现原理 -- RPC -- 迭代版本V3 -- 远程方法调用 整合 Spring

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首页 > 代码库 > 网络编程 -- RPC实现原理 -- RPC -- 迭代版本V3 -- 远程方法调用整合 Spring

网络编程 -- RPC实现原理 -- RPC -- 迭代版本V3 -- 远程方法调用整合 Spring