How to use Java RMI

Server

Package Server;import Java.rmi.naming;import Java.rmi.rmisecuritymanager;import java.rmi.registry.LocateRegistry; Import Service.calc;import Serviceimpl.calcimpl;public class server{      //Due to this test we are end users, so throw exceptions directly to the virtual machine public      static void Main (string[] args) throws Exception      {           System.setsecuritymanager (new Rmisecuritymanager ());//Permissions           system.setproperty ("Java.rmi.server.hostname", "192.168.1.119");  Specify an extranet IP             locateregistry.createregistry (9000);          System.setproperty ("Java.security.policy", "/home/ufo/workspace_java/rmiserver/calc.policy");          Calc C = new Calcimpl ();              Naming.rebind ("Rmi://192.168.1.119:9000/calc", c);              SYSTEM.OUT.PRINTLN ("RMI Server start ...");}      

　　

Service

Package Service;import java.rmi.*;p ublic interface Calc extends Remote {public int add (int x,int y) throws RemoteException ;}

Service Impl

Package Serviceimpl;import Java.rmi.remoteexception;import Java.rmi.server.unicastremoteobject;import Service.Calc  ;p ublic class Calcimpl extends UnicastRemoteObject implements calc{/** *  */private static final long Serialversionuid = 6523564220840187253l;public Calcimpl () throws RemoteException {super ();//TODO auto-generated constructor stub}@ overridepublic int Add (int x, int y) {//TODO auto-generated method StubSystem.out.println ("Add called!"); return x+y;}}

　　

Client

Package Client;import java.rmi.*; Import Java.net.malformedurlexception;import Service.calc;public class Client {     //Also for convenience, direct exception throws public     static void Main (string[] args) throws Exception     {         System.setsecuritymanager (new Rmisecuritymanager ());         Try         {//             here because it is local so omit the address and protocol, if the remote method call in the network, need to write this             //Converter C = (Converter) naming.lookup ("rmi:// 192.168.0.13/convert ");             Calc C = (Calc) naming.lookup ("Rmi://192.168.1.119:9000/calc");             int RMB = C.add (10,20);             SYSTEM.OUT.PRINTLN ("Add Result:" + RMB);         }         catch (malformedurlexception e)         {             e.printstacktrace ();         }         catch (RemoteException e)         {             e.printstacktrace ();         }         catch (notboundexception e)         {             e.printstacktrace ();}}     }

　　

Both the client and server sides need to develop class permission files, which are command Java-djava.security.policy=./calc.policy server at startup. Server[client. Client]

Calc.policy

Grant {
Permission java.security.AllPermission;
};

The client also needs a service interface declaration

How to use Java RMI