public class ServiceCenter implements Server 
    private static ExecutorService executor = Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors());
 
    private static final HashMap<String, Class> serviceRegistry = new HashMap<String, Class>();
 
    private static boolean isRunning = false;
 
    private static int port;
 
    public ServiceCenter(int port) 
        this.port = port;
    
 
    public void stop() 
        isRunning = false;
        executor.shutdown();
    
 
    public void start() throws IOException 
        ServerSocket server = new ServerSocket();
        server.bind(new InetSocketAddress(port));
        System.out.println("start server");
        try 
            while (true) 
                // 1.监听客户端的TCP连接，接到TCP连接后将其封装成task，由线程池执行
                executor.execute(new ServiceTask(server.accept()));
            
         finally 
            server.close();
        
    
 
    public void register(Class serviceInterface, Class impl) 
        serviceRegistry.put(serviceInterface.getName(), impl);
    
 
    public boolean isRunning() 
        return isRunning;
    
 
    public int getPort() 
        return port;
    
 
    private static class ServiceTask implements Runnable 
        Socket clent = null;
 
        public ServiceTask(Socket client) 
            this.clent = client;
        
 
        public void run() 
            ObjectInputStream input = null;
            ObjectOutputStream output = null;
            try 
                // 2.将客户端发送的码流反序列化成对象，反射调用服务实现者，获取执行结果
                input = new ObjectInputStream(clent.getInputStream());
                String serviceName = input.readUTF();
                String methodName = input.readUTF();
                Class<?>[] parameterTypes = (Class<?>[]) input.readObject();
                Object[] arguments = (Object[]) input.readObject();
                Class serviceClass = serviceRegistry.get(serviceName);
                if (serviceClass == null) 
                    throw new ClassNotFoundException(serviceName + " not found");
                
                Method method = serviceClass.getMethod(methodName, parameterTypes);
                Object result = method.invoke(serviceClass.newInstance(), arguments);
 
                // 3.将执行结果反序列化，通过socket发送给客户端
                output = new ObjectOutputStream(clent.getOutputStream());
                output.writeObject(result);
             catch (Exception e) 
                e.printStackTrace();
             finally 
                if (output != null) 
                    try 
                        output.close();
                     catch (IOException e) 
                        e.printStackTrace();
                    
                
                if (input != null) 
                    try 
                        input.close();
                     catch (IOException e) 
                        e.printStackTrace();
                    
                
                if (clent != null) 
                    try 
                        clent.close();
                     catch (IOException e) 
                        e.printStackTrace();
                    
                
            
 
        
    

public class RPCClient<T> 
    public static <T> T getRemoteProxyObj(final Class<?> serviceInterface, final InetSocketAddress addr) 
        // 1.将本地的接口调用转换成JDK的动态代理，在动态代理中实现接口的远程调用
        return (T) Proxy.newProxyInstance(serviceInterface.getClassLoader(), new Class<?>[]serviceInterface,
                new InvocationHandler() 
                    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable 
                        Socket socket = null;
                        ObjectOutputStream output = null;
                        ObjectInputStream input = null;
                        try 
                            // 2.创建Socket客户端，根据指定地址连接远程服务提供者
                            socket = new Socket();
                            socket.connect(addr);
 
                            // 3.将远程服务调用所需的接口类、方法名、参数列表等编码后发送给服务提供者
                            output = new ObjectOutputStream(socket.getOutputStream());
                            output.writeUTF(serviceInterface.getName());
                            output.writeUTF(method.getName());
                            output.writeObject(method.getParameterTypes());
                            output.writeObject(args);
 
                            // 4.同步阻塞等待服务器返回应答，获取应答后返回
                            input = new ObjectInputStream(socket.getInputStream());
                            return input.readObject();
                         finally 
                            if (socket != null) socket.close();
                            if (output != null) output.close();
                            if (input != null) input.close();
                        
                    
                );