rmi java程序未预期输出

Question

The rmi program when run asks a command.

If I gave ipconfig it works,but does not works for ping www.google.com and powercfg/batteryreport etc. I think it does not works if their is a space or slash between the input command.

Any help would be appreciated

si.java

 import java.rmi.*;
 import java.net.*;
 import java.io.*; 

 public interface si extends Remote{
      public String calc(String com) throws RemoteException,IOException;
 }

imp.java

  import java.rmi.*;
  import java.rmi.server.*;
  import java.util.*;
  import java.net.*;
  import java.io.*;

  public class imp extends UnicastRemoteObject implements si{

  imp() throws RemoteException,IOException {
      super();
  }

  public String calc(String com) throws IOException{
      String inputLine;
      Runtime r=Runtime.getRuntime();
      Process p=r.exec(com);
      BufferedReader in=new BufferedReader(new InputStreamReader(p.getInputStream()));

      while((inputLine = in.readLine()) != null) {
          System.out.println(inputLine);
          //pingResult += inputLine;
      }

      return inputLine;
   }

}

server.java

  import java.rmi.*;
  import java.rmi.registry.*;

  public class server{
       public static void main(String args[]){
           try{
               si stub=new imp();
               Naming.rebind("rmi://localhost:5000/example",stub);
           } catch(Exception e) {
           }
       }
 }

client.java

import java.rmi.*;
import java.util.*;
public class client{
    public static void main(String args[]){
       try{
             si a=(si)Naming.lookup("rmi://localhost:5000/example");
             Scanner s=new Scanner(System.in);
             System.out.println("enter command");
             String com=s.next();
             System.out.println(a.calc(com));
             } catch(Exception e){
             }
      }
}

Answer 1

Scanner by default parses whitespace-delimited tokens, so you are getting and sending to the server only the first part of the input line. The server can only execute what you send it.

Use Scanner.nextLine() . Or if you only want lines, you don't need Scanner ; use BufferedReader and readLine() .