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.ServerSocket;
import java.net.Socket;
public class RpcFramework {
public static void export(final Object service, final Class interfaceClazz, int port) throws Exception {
System.out.println("Export service " + service.getClass().getName() + " on port " + port);
ServerSocket server = new ServerSocket(port);
for (;;) {
final Socket socket = server.accept();
new Thread(new Runnable() {
public void run() {
try {
ObjectInputStream input = new ObjectInputStream(socket.getInputStream());
String interfaceName = input.readUTF();
String methodName = input.readUTF();
Class<?>[] parameterTypes = (Class<?>[]) input.readObject();
Object[] arguments = (Object[]) input.readObject();
ObjectOutputStream output = new ObjectOutputStream(socket.getOutputStream());
Method method = service.getClass().getMethod(methodName, parameterTypes);
Object result = method.invoke(service, arguments);
output.writeObject(result);
} catch (Exception e) {
throw new RuntimeException(e.toString());
}
}
}).start();
}
}
@SuppressWarnings("unchecked")
public static <T> T refer(final Class<T> interfaceClass, final String host, final int port) throws Exception {
System.out.println("Get remote service " + interfaceClass.getName() + " from server " + host + ":" + port);
return (T) Proxy.newProxyInstance(interfaceClass.getClassLoader(), new Class<?>[] { interfaceClass },
new InvocationHandler() {
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
Socket socket = new Socket(host, port);
ObjectOutputStream output = new ObjectOutputStream(socket.getOutputStream());
output.writeUTF(interfaceClass.getName());
output.writeUTF(method.getName());
output.writeObject(method.getParameterTypes());
output.writeObject(args);
ObjectInputStream input = new ObjectInputStream(socket.getInputStream());
Object result = input.readObject();
if (result instanceof Throwable) {
throw (Throwable) result;
}
return result;
}
});
}
}
RpcFramework.java文件是最核心的處理流程，服務端調用其中的export()方法對外暴露服務，客戶端調用refer()方法進行遠程過程調用，其實就是生成了一個動態代理對象，調用該動態代理對象中的invoke()方法，查看源碼可以看到invoke方法中就是使用了java的BIO去連接服務端，並將要調用的接口、方法、參數等傳輸給服務端；而服務端通過這些參數調用具體的對象就返回結果。
公共接口：
public interface HelloService {
String hello();
String hello(String name);
}服務端實現類：
public class HelloServiceImpl implements HelloService {
public String hello() {
return "Hello";
}
public String hello(String name) {
return "Hello," + name;
}
}服務端暴露服務類：
public class RpcProvider {
public static void main(String[] args) throws Exception {
HelloService service = new HelloServiceImpl();
RpcFramework.export(service, HelloService.class, 9000);
}
}客戶端啓動類：
public class RpcConsumer {
public static void main(String[] args) throws Exception {
HelloService service = RpcFramework.refer(HelloService.class, "127.0.0.1", 9000);
String result = service.hello("rod");
System.out.println(result);
}
}