基于TCP的RPC调用

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RPC即远程过程调用，被广泛使用，面向接口的编程。

consumer ———— provider

通过反射实现类的实例化

</pre></p><p>java代码如下：</p><p></p><p><h2>provider端</h2></p><p>接口类：<pre style="background-color:#c7edcc;color:#000000;font-family:'宋体';font-size:12.0pt;">SayHelloService

public interface SayHelloService {    public String sayHello(String helloArg);}

接口实现类：SayHelloServiceImp 

public class SayHelloServiceImp implements SayHelloService {    public String sayHello(String helloArg) {        if(helloArg.equals("good")){            return "good";        }else{            return "bad !!";        }    }}

服务类：

ServerSocketTest

public class ServerSocketTest {    private static ConcurrentHashMap<String,Object> services = new ConcurrentHashMap<String, Object>(10);    static{       //类路径自己定义        services.put("com.jc.rpc.SayHelloService",new SayHelloServiceImp());    }    public static void main(String[] args) {        ServerSocket server = null;        try {            server = new ServerSocket(1234);            while (true){                Socket socket = server.accept();                //读取服务信息                ObjectInputStream input = new ObjectInputStream(socket.getInputStream());                String interfaceName = input.readUTF();//接口名称                String methodName = input.readUTF();//方法名称                Class<?>[] parameterTypes = (Class<?>[])input.readObject();//参数类型                Object[] arguments = (Object[])input.readObject();//参数对象                //执行调用                Class<?> serviceInterfaceClass = Class.forName(interfaceName);                Object service = services.get(interfaceName);//取得服务实现的对象                Method method = serviceInterfaceClass.getMethod(methodName,parameterTypes);                System.out.println("interface:"+interfaceName+",method:"+methodName+"arguments:"+ Arrays.toString(arguments));                Object result = method.invoke(service,arguments);                ObjectOutputStream output = new ObjectOutputStream(socket.getOutputStream());                output.writeObject(result);            }        } catch (IOException e) {            e.printStackTrace();        }catch (ClassNotFoundException e) {            e.printStackTrace();        } catch (NoSuchMethodException e) {            e.printStackTrace();        }  catch (IllegalAccessException e) {            e.printStackTrace();        } catch (InvocationTargetException e) {            e.printStackTrace();        }    }}

consumer端

客户端调用类：

public class SocketCilent {    public static void main(String[] args) throws NoSuchMethodException, IOException, ClassNotFoundException {        //接口名称        String interfaceName = SayHelloService.class.getName();        //需要传递到远端的参数        Object[] arguments = {"1"};        //需要远程执行的方法        Method method = SayHelloService.class.getMethod("sayHello", String.class);        Socket socket = new Socket("127.0.0.1",8888);        ObjectOutputStream output = new ObjectOutputStream(socket.getOutputStream());        output.writeUTF(interfaceName);        output.writeUTF(method.getName());        output.writeObject(method.getParameterTypes());        output.writeObject(arguments);        //从远端读取执行结果        ObjectInputStream input = new ObjectInputStream(socket.getInputStream());        Object result = input.readObject();        System.out.println(result);    }}

该方式采用的是阻塞式IO实现，下一篇会采用NIO方式实现，并且加入动态代理。

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