public interface HelloService {
 
  String sayHi(String name);
 
}

public class HelloServiceImpl implements HelloService {
 
  public String sayHi(String name) {
    return "Hi, " + name;
  }
 
}

public interface Server {
  public void stop();
 
  public void start() throws IOException;
 
  public void register(Class serviceInterface, Class impl);
 
  public boolean isRunning();
 
  public int getPort();
}

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.監(jiān)聽客戶端的TCP連接，接到TCP連接后將其封裝成task，由線程池執(zhí)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.將客戶端發(fā)送的碼流反序列化成對(duì)象，反射調(diào)用服務(wù)實(shí)現(xiàn)者，獲取執(zhí)行結(jié)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.將執(zhí)行結(jié)果反序列化，通過(guò)socket發(fā)送給客戶端
        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.將本地的接口調(diào)用轉(zhuǎn)換成JDK的動(dòng)態(tài)代理，在動(dòng)態(tài)代理中實(shí)現(xiàn)接口的遠(yuǎn)程調(diào)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.創(chuàng)建Socket客戶端，根據(jù)指定地址連接遠(yuǎn)程服務(wù)提供者
              socket = new Socket();
              socket.connect(addr);
 
              // 3.將遠(yuǎn)程服務(wù)調(diào)用所需的接口類、方法名、參數(shù)列表等編碼后發(fā)送給服務(wù)提供者
              output = new ObjectOutputStream(socket.getOutputStream());
              output.writeUTF(serviceInterface.getName());
              output.writeUTF(method.getName());
              output.writeObject(method.getParameterTypes());
              output.writeObject(args);
 
              // 4.同步阻塞等待服務(wù)器返回應(yīng)答，獲取應(yīng)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();
            }
          }
        });
  }
}

public class RPCTest {
 
  public static void main(String[] args) throws IOException {
    new Thread(new Runnable() {
      public void run() {
        try {
          Server serviceServer = new ServiceCenter(8088);
          serviceServer.register(HelloService.class, HelloServiceImpl.class);
          serviceServer.start();
        } catch (IOException e) {
          e.printStackTrace();
        }
      }
    }).start();
    HelloService service = RPCClient.getRemoteProxyObj(HelloService.class, new InetSocketAddress("localhost", 8088));
    System.out.println(service.sayHi("test"));
  }
}