Lập trình mạng - Ví dụ kỹ thuật RMI

<path_ to_java_home>\bin\javac.exe Calculator.java Biên dịch Implement và tạo Stub, Skeleton:. <path_ to_java_home>\bin\javac.exe CalculatorImpl.java[r]

VÍ DỤ KỸ THUẬT RMI

Calculator.java

import java.rmi.*;

public interface Calculator extends Remote{ public int sum(int n) throws RemoteException;

// sum = 1+2+3+…+n

}

CalculatorImpl.java

import java.rmi.*;

public class CalculatorImpl implements Calculator{ public int sum(int n) throws RemoteException{

System.out.println("Client request to calculate!"); int s=0;

for (int i=1;i<n;i++) s=s+i; return s; }

}

CaclculatorServer.java

import java.rmi.server.*; import java.rmi.*;

public class CalculatorServer{

public static void main(String args[]){ try{

CalculatorImpl c=new CalculatorImpl(); System.out.println("Exporting Calculator "); UnicastRemoteObject.exportObject(c); Naming.bind("rmi://localhost/MyCalculator",c); System.out.println("Register Calculator!"); }catch(Exception e){

System.out.println(e); }

} }

CalculatorClient.java

import java.rmi.*;

public class CalculatorClient{

public static void main(String args[]){ try{

System.out.println("Finding Object ");

//Call methods of c

System.out.println("Sum(12)= " + c.sum(12)); }catch(Exception e){

System.out.println(e); }

} }

Biên dịch:

Biên dịch interface:

<path_ to_java_home>\bin\javac.exe Calculator.java Biên dịch Implement tạo Stub, Skeleton:

<path_ to_java_home>\bin\javac.exe CalculatorImpl.java

<path_ to_java_home>\bin\rmic.exe CalculatorImpl.class –vcompat

Biên dịch Server Client:

<path_ to_java_home>\bin\javac.exe CalculatorServer.java <path_ to_java_home>\bin\javac.exe CalculatorClient.java

Thực thi:

Kích hoạt đăng ký RMI

<path_ to_java_home>\bin\rmiregistry.exe Kích hoạt server

<path_ to_java_home>\bin\java.exe CalculatorServer.class Kích hoạt client