RPC demo

RPC Server端代码，主要是使用ServerSocket获得rpc调用客户端发送过来的类信息，方法信息及方法参数信息，通过反射在RPCServer端进行代码执行，最后将执行结果发送给Socket，第一步需要首先执行RPCServer。（转载 https://blog.csdn.net/qq924862077/article/details/52946580）

/**
 * @author jy
 * @date 2018年10月31日
 * <p>Description: </p> 
 */
package rpc.demo;

import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.net.Socket;

/**
 * @author jy
 *
 */
public class RpcProxy {

    @SuppressWarnings("unchecked")
    public static <T> T create(final Object target)
    {
        return (T) Proxy.newProxyInstance(target.getClass().getClassLoader(), target.getClass().getInterfaces(), new InvocationHandler(){

            @Override
            public Object invoke(Object proxy, Method method, Object[] args)
                    throws Throwable {

                Socket socket=new Socket("localhost",8080);
                ObjectOutputStream output=new ObjectOutputStream(socket.getOutputStream());
                output.writeUTF(target.getClass().getName());
                output.writeUTF(method.getName());
                output.writeObject(method.getParameterTypes());//参数类型
                output.writeObject(args);//参数值
                
                ObjectInputStream input=new ObjectInputStream(socket.getInputStream());
                
                Object result=input.readObject();
                if(result instanceof Throwable){
                    throw (Throwable)result;
                }
                input.close();
                output.close();
                socket.close();
                return result;
                
                
            }
            
        });
    }
}
···
服务器端代码
```Java
/**
 * @author jy
 * @date 2018年10月31日
 * <p>Description: </p> 
 */
package rpc.demo;

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.concurrent.ConcurrentHashMap;

/**
 * @author jy
 *
 */
public class RpcServer {
    public static ConcurrentHashMap<String , Object> classMap=new ConcurrentHashMap<String, Object>();
    public static void invoker(int port) throws Exception{
        ServerSocket server=new ServerSocket(port);
        for(;;){
            try{
                final Socket socket=server.accept();
                new Thread(new Runnable(){

                    ObjectOutputStream out=null;
                    ObjectInputStream in=null;
                    @Override
                    public void run() {

                        try {
                            try {
                            out=new ObjectOutputStream(socket.getOutputStream());
                            in=new ObjectInputStream(socket.getInputStream());
                            String className=in.readUTF();
                            String methodName=in.readUTF();
                            Class<?>[] parameterType=(Class<?>[]) in.readObject();
                            Object[] arguments=(Object[]) in.readObject();
                            Object claszz=null;
                            if(!classMap.containsKey(className)){
                                try {
                                    claszz=Class.forName(className).newInstance();
                                    classMap.put(className, claszz);
                                } catch (InstantiationException e) {
                                    // TODO Auto-generated catch block
                                    e.printStackTrace();
                                } catch (IllegalAccessException e) {
                                    // TODO Auto-generated catch block
                                    e.printStackTrace();
                                }
                            }
                            else{
                                claszz=classMap.get(className);
                            }
                            
                            Method method=claszz.getClass().getMethod(methodName, parameterType);
                            Object result=method.invoke(claszz, arguments);
                            out.writeObject(result);
                            } catch (ClassNotFoundException e) {
                                // TODO Auto-generated catch block
                                e.printStackTrace();
                            } catch (SecurityException e) {
                                // TODO Auto-generated catch block
                                e.printStackTrace();
                            } catch (NoSuchMethodException e) {
                                // TODO Auto-generated catch block
                                e.printStackTrace();
                            } catch (IllegalArgumentException e) {
                                // TODO Auto-generated catch block
                                e.printStackTrace();
                            } catch (IllegalAccessException e) {
                                // TODO Auto-generated catch block
                                e.printStackTrace();
                            } catch (InvocationTargetException e) {
                                // TODO Auto-generated catch block
                                e.printStackTrace();
                            }finally{
                                out.close();
                                in.close();
                                
                            }
                        } catch (IOException e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        }
                        finally{
                            try {
                                socket.close();
                            } catch (IOException e) {
                                // TODO Auto-generated catch block
                                e.printStackTrace();
                            }
                        }
                        
                    }
                    
                }).start();
            }
            catch(Exception e){
                e.printStackTrace();
            }
        }
    }

    public static void main(String args[]){
        RpcServer server=new RpcServer();
        try {
            server.invoker(8080);
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

service

public interface UserService {
    String getName(String userId);
    
    String addUser(String u);
}

impl

/**
 * @author jy
 * @date 2018年5月4日
 * <p>Description: </p> 
 */
package com.dubbo.service.impl;

import org.springframework.stereotype.Component;


@Component("userService")
public class UserServiceImpl  implements UserService{

    /* (non-Javadoc)
     * @see com.dubbo.service.UserService#getName(java.lang.String)
     */
    @Override
    public String getName(String userId) {
        // TODO Auto-generated method stub
        return "userName"+userId;
    }

    /* (non-Javadoc)
     * @see com.dubbo.service.UserService#addUser(java.lang.String)
     */
    @Override
    public String addUser(String u) {

        System.out.println("add user");
        return null;
    }
}

main

/**
 * @author jy
 * @date 2018年10月31日
 * <p>Description: </p> 
 */
package socket.demo;

import rpc.demo.RpcProxy;

import com.dubbo.service.impl.UserService;
import com.dubbo.service.impl.UserServiceImpl;

/**
 * @author jy
 *
 */
public class Main {

    /**
     * @param args
     *<p>Description: </p>  
     */
    public static void main(String[] args) {

        UserService userService = new UserServiceImpl();
        RpcProxy proxy=new RpcProxy();
        UserService userProxy=proxy.create(userService);
        System.out.println(userProxy.getName("jy"));
    }

}