Although we rarely use RMI to program, do the earliest distributed solution for Java, we still have a need to know, start with example (although it is a few years ago)!
Remote interface RMIHELLOREMOTEINTFC .JAVA
Import java.rmi. *;
Public interface rmihelloremoteintfc extends remote {string helloremoteobj (string client) throws remoteexception;}
Remote interface implementation class RMIHELLOREMOTEOBJ.JAVA
Import java.rmi.server. *; import java.rmi. *;
Public Class RmihelloremoteObj Extends UnicastremoteObject Implements RmihelloremoteInTfc {
Public rmihelloremoteobj () throws remoteException {super ();
Public String Helloremoteobj (String Client) THROWS RemoteException {Return "Hello World" Client;
}
Server RMIHELLOSERVER.JAVA
Import java.io. *; import java.rmi. *; import java.rmi.server. *; import sun.applet. *; import java.rmi.registry.locateRegistry;
Public class rmihelloserver {
Public rmihelloserver ()} public static void main (String [] args) {// creates and installs the security manager if (System.getSecurityManager () == null) {System.setSecurityManager (NEW RMISECURITYMANAGER ());}
Try {// Create a remote object RMIHELLOREMOTEOBJ TTT = new rmihelloremoteObj (); // Start registry locateRegistry.createRegistry (2222); // Award name Bind to Object Naming.rebind ("// fangm: 2222 / helloobj", ttt );
System.out.println ("RMI server is running ...");} catch (exception e) {E.printStackTrace ();
}
Server-side permission file RMIHELLOSERVER.POLICY
Grant CodeBase "File: / E: / Download / Rmitest /" {Permission Java.net.SocketPermission "*: 1000-9999", "Accept, Connect, Listen, Resolve";
Take a look at how the Client end is connected to the server and the call to the remote method.
Import java.rmi. *; import java.rmi.server. *;
Public class rmihelloclient {
Public rmihelloclient ()} public static void main (String [] args) {// creates and installs the security manager if (system.getsecuritymanager () == null) {system.setSecurityManager (NEW RMISECURITYMANAGER ());} Try { RmiHelloRemoteIntfc c1 = (RmiHelloRemoteIntfc) Naming.lookup ( "rmi: // Fangm: 2222 / helloObj"); System.out.println (c1.helloRemoteObj ( "Everyone"));} catch (Exception e) {e.printStackTrace ( } System.exit (0);
}
CLIENT End RMIHelloClient.Policy
Grant CodeBase "File: / E: / Download / Rmitest /" {Permission Java.net.SocketPermission "*: 1000-9999", "Accept, Connect, Listen, Resolve";
Ok, one of the simplest RMI examples will be safe, and the most important step is to compile and run. Let's take a batch of BAT or CMD to do it.
Take a look at RMIHELLO.BAT.
Javac RMIHelloremoteIntfc.java
Javac RMIHelloremoteobj.java
RMIC RMIHELLOREMOTEOBJ
Javac RMIHELLOSERVER.JAVA
Javac RMIHELLOCLIENT.JAVA
Echo launches the server in another window, please wait. . . Start java -djava.security.policy = rmihelloserver.policy RMIHELLOSERVER
Echo runs a client. . . Java -Djava.security.policy = rmihelloclient.policy rmihelloclient This file is simple! In the package, you will try it, although it is simple, but for beginners, it is still very good!
