Merge pull request #416 from vidyaa18/vidya

Add Online voting system using java servlets

Author: kishanrajput23

Online Voting System/Online_Voting_System/build/classes/vote/com/servlet/DBUtilR.class

@@ -0,0 +1,30 @@
+package vote.com.servlet;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+
+public class DBUtilR {
+	  static Connection conn = null;
+	static
+	 {	
+		try {
+			Class.forName("com.mysql.jdbc.Driver");
+			
+			conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/votingdb", "Vaishnavi", "Nelavetla@537");
+			
+			if(!conn.isClosed()) {
+				System.out.println("Connection established");
+			}
+			
+		} catch (ClassNotFoundException | SQLException e) {
+			System.out.println("Error in DBUtilFile");
+			e.printStackTrace();
+		}
+	}
+	
+	public static  Connection getDBConnection() {
+		// TODO Auto-generated method stub
+		return conn;
+	}
+}

Online Voting System/Online_Voting_System/build/classes/vote/com/servlet/againvote.class

@@ -0,0 +1,18 @@
+package vote.com.servlet;
+
+import java.io.IOException;
+
+import jakarta.servlet.ServletException;
+import jakarta.servlet.http.HttpServlet;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+
+public class againvote extends HttpServlet {
+	private static final long serialVersionUID = 1L;
+       
+	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 
+	{
+		doGet(request, response);
+	}
+
+}

Online Voting System/Online_Voting_System/build/classes/vote/com/servlet/loginpage.class

@@ -0,0 +1,71 @@
+package vote.com.servlet;
+
+import jakarta.servlet.RequestDispatcher;
+import jakarta.servlet.ServletException;
+import jakarta.servlet.http.HttpServlet;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+
+import java.io.IOException;
+import java.io.PrintWriter;
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+
+public class loginpage extends HttpServlet {
+	private static final long serialVersionUID = 1L;
+	
+	final static  Connection con=DBUtilR.getDBConnection();
+	static PreparedStatement ps = null;
+       
+	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 
+	{
+		PrintWriter out = response.getWriter();  
+		String card=request.getParameter("cardno");
+		Integer pin=Integer.parseInt(request.getParameter("pin"));
+		
+		try {
+			if(check(card,pin))
+			{
+				out.print("Successful Login...You Can Vote Now");
+				RequestDispatcher rd=request.getRequestDispatcher("vote.html");
+				 rd.include(request,response);
+			}	
+			else {
+				 out.print("Sorry username or password error , Make new account");  
+				 RequestDispatcher rd=request.getRequestDispatcher("registration.html");  
+			        rd.include(request,response);
+			}
+		}
+		catch (SQLException e) {
+			e.printStackTrace();
+		}
+	
+	
+	}
+	static boolean check(String card,Integer pin) throws SQLException
+	 {
+		 boolean r=false;
+		 ps=con.prepareStatement("Select * from register where cardno=? and pin=?");
+		 ps.setString(1,card);
+		 ps.setInt(2,pin);
+		 ResultSet rs=ps.executeQuery();
+		 r=rs.next();
+		 
+		 return r;
+	 }
+	
+	static boolean checkvote(String card) throws SQLException
+	 {
+		 boolean r=false;
+		 ps=con.prepareStatement("Select * from vote where cardno=?");
+		 ps.setString(1,card);
+		 
+		 ResultSet rs=ps.executeQuery();
+		 r=rs.next();
+		 
+		 return r;
+	 }
+
+}

Online Voting System/Online_Voting_System/build/classes/vote/com/servlet/registration.class

@@ -0,0 +1,75 @@
+package vote.com.servlet;
+
+import jakarta.servlet.RequestDispatcher;
+import jakarta.servlet.ServletException;
+import jakarta.servlet.http.HttpServlet;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+
+import java.io.IOException;
+import java.io.PrintWriter;
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.PreparedStatement;
+
+public class registration extends HttpServlet {
+	private static final long serialVersionUID = 1L;
+ 
+	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 
+	{
+		response.setContentType("text/html");  
+		PrintWriter out = response.getWriter();
+		
+		
+		String f=request.getParameter("fname");
+		
+		String c=request.getParameter("cardno");
+		String cn=request.getParameter("cono");
+		String ad=request.getParameter("add");
+		String dob=request.getParameter("dob");
+		String email=request.getParameter("email");
+		String pin=request.getParameter("pin");
+		try
+		{
+		
+		Class.forName("com.mysql.jdbc.Driver");
+		Connection con=(Connection) DriverManager.getConnection("jdbc:mysql://localhost:3306/votingdb","Vaishnavi","Nelavetla@537");
+		PreparedStatement ps=con.prepareStatement("insert into register values(?,?,?,?,?,?,?)");
+		ps.setString(1,f);
+		
+		ps.setString(2,c);
+		ps.setString(3,cn);
+		ps.setString(4,ad);
+		ps.setString(5,dob);
+		ps.setString(6,email);
+		ps.setString(7,pin);
+		int i=ps.executeUpdate();
+		if(i>0)
+		{
+			out.print("Successfully your account has been created...PLEASE LOGIN");
+			 RequestDispatcher rd=request.getRequestDispatcher("loginpage.html");  
+		        rd.include(request,response);
+		}
+		else
+		{
+			out.print("Failed account creation try again");
+			 RequestDispatcher rd=request.getRequestDispatcher("registration.html");  
+		        rd.include(request,response);
+		}
+			
+		}
+		catch (Exception e2) {
+			out.print("Invalid , Failed account creation try again  "+e2);
+			 RequestDispatcher rd=request.getRequestDispatcher("registration.html");  
+		        rd.include(request,response);
+		}
+		
+		out.close();
+	
+}
+	protected void service(HttpServletRequest request, HttpServletResponse   response) throws ServletException, IOException 
+	{
+        doPost(request, response);
+	}
+
+}