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.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();

            }

          }

        });

  }

} 

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"));

  }

} 

regeist service HelloService

start server

Hi, test