RPC的要素RMI?log4j核弹级漏洞?Java RMI，远程方法调用简单实例

RPC的要素RMI?log4j核弹级漏洞?Java RMI，远程方法调用简单实例

java的RMI即远程方法调用，Remote Method Invcation，实现远程类对象的传输，支持JVM同环境调用。

1. RMIServer端实现

   • 创建被调用对象接口并继承Remote接口，IServerInt

     package cn.rmiServer;
     
     import java.rmi.Remote;
     import java.rmi.RemoteException;
     
     /**
      * @author 王居三木超
      * @version 1.0
      * @date 2021/12/20 20:10
      * @description TODO
      **/
     public interface IServerInt extends Remote {
         String init() throws RemoteException;
     }
     

   • 实现被调用对象接口IServerInt，继承UnicastRemoteObject，IServerImpl

     package cn.rmiServer;
     
     import java.rmi.RemoteException;
     import java.rmi.server.UnicastRemoteObject;
     
     /**
      * @author 王居三木超
      * @version 1.0
      * @date 2021/12/20 20:10
      * @description TODO
      **/
     public class IServerImpl extends UnicastRemoteObject implements IServerInt{
     
         protected IServerImpl() throws RemoteException {
         }
     
         @Override
         public String init() throws RemoteException{
             return "Hello";
         }
     }
     
     

   • 创建服务发布

     package cn.rmiServer;
     
     import java.net.MalformedURLException;
     import java.rmi.Naming;
     import java.rmi.RemoteException;
     import java.rmi.registry.LocateRegistry;
     
     /**
      * @author 王居三木超
      * @version 1.0
      * @date 2021/12/20 20:15
      * @description TODO
      **/
     public class Server {
         /**
          * <p>
          * create Method and registry to port
          * next bind Method to rmi://hostname/path
          * </p>
          */
         public static void main(String[] args) {
             try {
                 //create Method
                 IServerImpl iServer = new IServerImpl();
                 //registry to port
                 LocateRegistry.createRegistry(1099);
                 //bind Method 
                 Naming.rebind("rmi://127.0.0.1/start", iServer);
                 System.out.println("start success");
             } catch (RemoteException | MalformedURLException e) {
                 e.printStackTrace();
             }
         }
     }
     
     

2.RMI客户端实现

package cn.rimClient;

import cn.rmiServer.IServerInt;

import java.net.MalformedURLException;
import java.rmi.Naming;
import java.rmi.NotBoundException;
import java.rmi.RemoteException;

/**
 * @author 王居三木超
 * @version 1.0
 * @date 2021/12/20 20:11
 * @description TODO
 **/
public class ClientStart {
    public static void main(String[] args) throws RemoteException, NotBoundException, MalformedURLException {
        String URL = "rmi://127.0.0.1/";
        IServerInt lookup = (IServerInt) Naming.lookup(URL + "start");
        System.out.println(lookup.init());
    }
}

3. 启动服务端

   

4. 启动客户端查看结果

​ 结果调用了方法

本例为单例测试，真实远端调用将远程接口类封装部署在客户端即可。