Tài liệu VÍ DỤ KỸ THUẬT RMI doc

VÍ DỤ KỸ THUẬT RMICalculator.java import java.rmi.*; public interface Calculator extends Remote{ public int sumint n throws RemoteException; // sum = 1+2+3+…+n } CalculatorImpl.java impo

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 ");

Calculator c=(Calculator)Naming.lookup("rmi://localhost/MyCalculator");

//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 và 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 và Client:

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

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

Thực thi:

Kích hoạt bộ 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

<path_ to_java_home>\bin\java.exe CalculatorClient.class