Question

How do we provide security to RMI classes? Write a program to implement Simple Student database application using RMI. Remote client consist of GUI for performing different database operations (For ex. Insert, delete, update) and retrieving data through RMI.

Answer 1

Firstly, create class Student and an interface to invoke the following implementation:

import java.sql.*; 
import java.util.*;  






//Implementing an interface StudentDatabase.
public class simpleExample implements StudentDatabase {  
   
   //Interface method is implemented
   public List<Student> getStudents() throws Exception {  
//Creating Array of students     
 List<Student> list = new ArrayList<Student>();   
    
       
      String jdbcDriver = "com.mysql.jdbc.Driver";   
      String databaseURL = "jdbc:mysql://localhost:3306/details";  
      
      // Database username and password 
      String user = "root"; 
      String pass = "pass_word";  
      
      Connection conn = null;  //Used to create connection to the database
//For quering the database      
Statement stmt = null;  
      
      //A driver for connecting to the database
      Class.forName("com.mysql.jdbc.Driver");   //JDBC driver
      
      //Opening connection to the database      
      conn = DriverManager.getConnection(Database_URL, user, pass); 
      System.out.println("Successfully connection to the database");  
      
      //Start of executing queries
      System.out.println("A statement is being created..."); 
      
      stmt = conn.createStatement();  
      String query1 = "SELECT * FROM student_data"; 
      ResultSet rs1 = stmt.executeQuery(query1);  
      
      //Extracting rows from the ResultSet statement 
      while(rs1.next()) { 
         
         int studentId  = rs1.getInt("id"); 
         
         String studentName = rs1.getString("name"); 
         String studentBranch = rs1.getString("branch"); 
         
         int studentPercent = rs1.getInt("percentage"); 
         String studentEmail = rs1.getString("email");  
         
      //Creating an object of Student class
         Student student = new Student(); 
         student.setID(id); 
         student.setName(name); 
         student.setBranch(branch); 
         student.setPercent(percent); 
         student.setEmail(email); 
         list.add(student); 
      } 
      rs1.close(); 
      return list;     
   }  
}