Add Online voting system using java servlets

Online Voting System/Online_Voting_System/src/main/java/vote/com/servlet/DBUtilR.java

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+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/src/main/java/vote/com/servlet/againvote.java

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+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/src/main/java/vote/com/servlet/loginpage.java

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+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/src/main/java/vote/com/servlet/registration.java

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+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);
+	}
+
+}

Online Voting System/Online_Voting_System/src/main/java/vote/com/servlet/thankyou.java

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

Online Voting System/Online_Voting_System/src/main/java/vote/com/servlet/vote.java

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+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;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.sql.SQLIntegrityConstraintViolationException;
+
+public class vote 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 
+	{
+		response.setContentType("text/html");  
+		PrintWriter out = response.getWriter();
+
+
+		String f=request.getParameter("cardno");
+		String l=request.getParameter("party");
+		try
+		{
+
+		Class.forName("com.mysql.jdbc.Driver");
+		Connection con=(Connection) DriverManager.getConnection("jdbc:mysql://localhost:3306/votingdb","Vaishnavi","Nelavetla@537");
+
+		if(checkLogin(f))
+		{
+
+		ps=con.prepareStatement("insert into vote values(?,?)");
+		ps.setString(1,f);
+		ps.setString(2,l);
+		int i=ps.executeUpdate();
+		if(i>0)
+		{
+			out.print("Your Vote has been submitted successfully...");
+			 RequestDispatcher rd=request.getRequestDispatcher("thankyou.html");  
+		        rd.include(request,response);
+		}
+		else
+		{
+			out.print("Failed to submit vote, try again");
+			 RequestDispatcher rd=request.getRequestDispatcher("vote.html");  
+		        rd.include(request,response);
+		}
+		}
+		else
+		{
+			out.print("Please enter correct card number");
+			RequestDispatcher rd=request.getRequestDispatcher("vote.html");  
+	        rd.include(request,response);
+		}
+		}
+		catch (SQLIntegrityConstraintViolationException e2) {
+			out.print("Please select any party");
+			 RequestDispatcher rd=request.getRequestDispatcher("vote.html");  
+		        rd.include(request,response);
+		}
+		catch(Exception e)
+		{
+			out.print(" " +e);
+			RequestDispatcher rd=request.getRequestDispatcher("vote.html");  
+	        rd.include(request,response);
+		}
+		out.close();
+
+
+}
+	protected void service(HttpServletRequest request, HttpServletResponse   response) throws ServletException, IOException {
+        doPost(request, response);
+}
+
+
+
+static boolean checkLogin(String card) throws SQLException
+{
+ boolean r=false;
+ ps=con.prepareStatement("Select * from register where cardno = ?");
+ ps.setString(1,card);
+
+ ResultSet rs=ps.executeQuery();
+ r=rs.next();
+
+ return r;
+}
+}

Online Voting System/Online_Voting_System/src/main/webapp/META-INF/MANIFEST.MF

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+Manifest-Version: 1.0
+Class-Path: 
+

Online Voting System/Online_Voting_System/src/main/webapp/WEB-INF/web.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="https://jakarta.ee/xml/ns/jakartaee" xmlns:web="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="https://jakarta.ee/xml/ns/jakartaee https://jakarta.ee/xml/ns/jakartaee/web-app_5_0.xsd" version="5.0">
+  <servlet>
+    <description></description>
+    <display-name>againvote</display-name>
+    <servlet-name>againvote</servlet-name>
+    <servlet-class>vote.com.servlet.againvote</servlet-class>
+  </servlet>
+  <servlet-mapping>
+    <servlet-name>againvote</servlet-name>
+    <url-pattern>/againvote</url-pattern>
+  </servlet-mapping>
+  <display-name>Online_Voting_System</display-name>
+  <welcome-file-list>
+    <welcome-file>againvote.html</welcome-file>
+    <welcome-file>loginpage.html</welcome-file>
+    <welcome-file>registration.html</welcome-file>
+    <welcome-file>thankyou.html</welcome-file>
+    <welcome-file>vote.html</welcome-file>
+  </welcome-file-list>
+  <servlet>
+    <description></description>
+    <display-name>DBUtilR</display-name>
+    <servlet-name>DBUtilR</servlet-name>
+    <servlet-class>vote.com.servlet.DBUtilR</servlet-class>
+  </servlet>
+  <servlet-mapping>
+    <servlet-name>DBUtilR</servlet-name>
+    <url-pattern>/DBUtilR</url-pattern>
+  </servlet-mapping>
+  <servlet>
+    <description></description>
+    <display-name>loginpage</display-name>
+    <servlet-name>loginpage</servlet-name>
+    <servlet-class>vote.com.servlet.loginpage</servlet-class>
+  </servlet>
+  <servlet-mapping>
+    <servlet-name>loginpage</servlet-name>
+    <url-pattern>/loginpage</url-pattern>
+  </servlet-mapping>
+  <servlet>
+    <description></description>
+    <display-name>registration</display-name>
+    <servlet-name>registration</servlet-name>
+    <servlet-class>vote.com.servlet.registration</servlet-class>
+  </servlet>
+  <servlet-mapping>
+    <servlet-name>registration</servlet-name>
+    <url-pattern>/registration</url-pattern>
+  </servlet-mapping>
+  <servlet>
+    <description></description>
+    <display-name>thankyou</display-name>
+    <servlet-name>thankyou</servlet-name>
+    <servlet-class>vote.com.servlet.thankyou</servlet-class>
+  </servlet>
+  <servlet-mapping>
+    <servlet-name>thankyou</servlet-name>
+    <url-pattern>/thankyou</url-pattern>
+  </servlet-mapping>
+  <servlet>
+    <description></description>
+    <display-name>vote</display-name>
+    <servlet-name>vote</servlet-name>
+    <servlet-class>vote.com.servlet.vote</servlet-class>
+  </servlet>
+  <servlet-mapping>
+    <servlet-name>vote</servlet-name>
+    <url-pattern>/vote</url-pattern>
+  </servlet-mapping>
+</web-app>