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‎pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>com</groupId>
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<artifactId>MyApp</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<packaging>war</packaging>
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<name>MyApp Maven Webapp</name>
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<!-- FIXME change it to the project's website -->
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<url>http://www.example.com</url>
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<properties>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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<maven.compiler.source>8</maven.compiler.source>
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<maven.compiler.target>8</maven.compiler.target>
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</properties>
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<dependencies>
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<dependency>
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<groupId>junit</groupId>
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<artifactId>junit</artifactId>
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<version>4.13.1</version>
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<scope>test</scope>
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</dependency>
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<!-- https://mvnrepository.com/artifact/com.mysql/mysql-connector-j -->
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<dependency>
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<groupId>com.mysql</groupId>
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<artifactId>mysql-connector-j</artifactId>
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<version>8.3.0</version>
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</dependency>
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<!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
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<dependency>
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<groupId>javax.servlet</groupId>
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<artifactId>javax.servlet-api</artifactId>
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<version>4.0.1</version>
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<scope>provided</scope>
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</dependency>
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</dependencies>
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<build>
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<finalName>MyApp</finalName>
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<pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
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<plugins>
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<plugin>
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<artifactId>maven-clean-plugin</artifactId>
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<version>3.4.0</version>
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</plugin>
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<!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->
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<plugin>
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<artifactId>maven-resources-plugin</artifactId>
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<version>3.3.1</version>
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</plugin>
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<plugin>
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<artifactId>maven-compiler-plugin</artifactId>
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<version>3.13.0</version>
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</plugin>
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<plugin>
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<artifactId>maven-surefire-plugin</artifactId>
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<version>3.3.0</version>
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</plugin>
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<plugin>
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<artifactId>maven-war-plugin</artifactId>
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<version>3.4.0</version>
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</plugin>
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<plugin>
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<artifactId>maven-install-plugin</artifactId>
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<version>3.1.2</version>
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</plugin>
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<plugin>
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<artifactId>maven-deploy-plugin</artifactId>
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<version>3.1.2</version>
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</plugin>
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</plugins>
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</pluginManagement>
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</build>
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</project>

‎src/main/java/controller/AddDataServlet.java‎

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package controller;
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import java.io.IOException;
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import javax.servlet.RequestDispatcher;
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import javax.servlet.ServletException;
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import javax.servlet.annotation.WebServlet;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import dao.UsersDAO;
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import model.Student;
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@WebServlet("/addRow")
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public class AddDataServlet extends HttpServlet{
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@Override
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protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
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int id=Integer.parseInt(req.getParameter("id"));
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String name=req.getParameter("name");
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double marks=Double.parseDouble(req.getParameter("marks"));
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long contact=Long.parseLong(req.getParameter("contact"));
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String gender=req.getParameter("gender");
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Student s=new Student();
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s.setId(id);
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s.setName(name);
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s.setMarks(marks);
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s.setGender(gender);
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s.setContact(contact);
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UsersDAO dao=new UsersDAO();
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try {
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dao.addData(s);
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RequestDispatcher dispatcher =req.getRequestDispatcher("dashboard");
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dispatcher.forward(req, resp);
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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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}

‎src/main/java/controller/DeleteServlet.java‎

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package controller;
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import java.io.IOException;
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import javax.servlet.RequestDispatcher;
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import javax.servlet.ServletException;
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import javax.servlet.annotation.WebServlet;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import dao.UsersDAO;
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@WebServlet("/deleteData")
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public class DeleteServlet extends HttpServlet{
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@Override
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protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
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int id=Integer.parseInt(req.getParameter("id"));
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UsersDAO dao=new UsersDAO();
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try {
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if (dao.deleteRow(id)==0) {
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req.setAttribute("DeletedStatus", "Data Not Found");
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RequestDispatcher dispatcher= req.getRequestDispatcher("dashboard");
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dispatcher.forward(req, resp);
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}
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else {
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req.setAttribute("DeletedStatus", "Delete Successfully");
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RequestDispatcher dispatcher= req.getRequestDispatcher("dashboard");
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dispatcher.forward(req, resp);
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}
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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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}

‎src/main/java/controller/DisplayAllServlet.java‎

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package controller;
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import java.io.IOException;
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import java.sql.ResultSet;
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import javax.servlet.RequestDispatcher;
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import javax.servlet.ServletException;
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import javax.servlet.annotation.WebServlet;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import dao.UsersDAO;
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@WebServlet("/dashboard")
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public class DisplayAllServlet extends HttpServlet{
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@Override
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protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
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UsersDAO dao=new UsersDAO();
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ResultSet set;
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try {
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set = dao.DisplayAll();
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req.setAttribute("Display", set);
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RequestDispatcher dispatcher = req.getRequestDispatcher("dashboard.jsp");
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dispatcher.forward(req, resp);
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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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}

‎src/main/java/controller/LoginServlet.java‎

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package controller;
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import java.io.IOException;
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import java.io.PrintWriter;
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import javax.servlet.RequestDispatcher;
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import javax.servlet.ServletException;
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import javax.servlet.annotation.WebServlet;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import javax.servlet.http.HttpSession;
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import dao.UsersDAO;
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import model.User;
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@WebServlet("/login")
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public class LoginServlet extends HttpServlet{
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private static final long serialVersionUID = 1L;
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@Override
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protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
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String user=req.getParameter("username");
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String pass=req.getParameter("password");
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UsersDAO dao =new UsersDAO();
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try {
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User u=dao.LoginAuthenticate();
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if (u.getUsername().equals(user)) {
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if (u.getPassword().equals(pass)) {
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HttpSession session= req.getSession(true);
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session.setAttribute("LoginSuccessful","Login Done" );
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RequestDispatcher dispatcher=req.getRequestDispatcher("dashboard");
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dispatcher.forward(req, resp);
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}
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else {
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req.setAttribute("LoginFailed", "Invalid Password");
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RequestDispatcher dispatcher=req.getRequestDispatcher("index.jsp");
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dispatcher.include(req, resp);
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}
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}
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else {
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req.setAttribute("LoginFailed", "Username Not Found");
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RequestDispatcher dispatcher=req.getRequestDispatcher("index.jsp");
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dispatcher.include(req, resp);
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}
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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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}

‎src/main/java/controller/Test.java‎

Whitespace-only changes.

‎src/main/java/dao/DBConnection.java‎

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package dao;
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import java.sql.Connection;
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import java.sql.DriverManager;
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public class DBConnection {
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private static final String Driver="com.mysql.cj.jdbc.Driver";
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private static final String url="jdbc:mysql://localhost:3306/billing_db";
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private static final String user="root";
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private static final String pass="root";
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public static Connection getConnection() throws Exception {
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Class.forName(Driver);
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return DriverManager.getConnection(url,user,pass);
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}
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}

‎src/main/java/dao/UsersDAO.java‎

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package dao;
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import java.sql.Connection;
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import java.sql.PreparedStatement;
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import java.sql.ResultSet;
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import java.sql.Statement;
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import model.Student;
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import model.User;
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public class UsersDAO {
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public User LoginAuthenticate() throws Exception {
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Connection con = DBConnection.getConnection();
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Statement s = con.createStatement();
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ResultSet rs = s.executeQuery("select * from user");
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User u = new User();
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if (rs.next()) {
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u.setUsername(rs.getString("username"));
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u.setPassword(rs.getString("password"));
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}
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return u;
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}
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public ResultSet DisplayAll() throws Exception{
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Connection con = DBConnection.getConnection();
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Statement s = con.createStatement();
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ResultSet rs = s.executeQuery("select * from Student");
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return rs;
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}
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public int addData(Student s)throws Exception {
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Connection con = DBConnection.getConnection();
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PreparedStatement ps=con.prepareStatement("insert into student values(?,?,?,?,?)");
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ps.setInt(1, s.getId());
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ps.setString(2, s.getName());
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ps.setDouble(3, s.getMarks());
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ps.setLong(4, s.getContact());
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ps.setString(5, s.getGender());
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return ps.executeUpdate();
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}
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public int deleteRow(int id) throws Exception{
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Connection con = DBConnection.getConnection();
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PreparedStatement ps=con.prepareStatement("delete from student where id = ?");
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ps.setInt(1, id);
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return ps.executeUpdate();
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}
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}

‎src/main/java/model/Student.java‎

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package model;
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public class Student {
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private int id;
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private String name;
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private double marks;
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private long contact;
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private String gender;
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public int getId() {
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return id;
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}
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public void setId(int id) {
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this.id = id;
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}
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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public double getMarks() {
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return marks;
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}
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public void setMarks(double marks) {
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this.marks = marks;
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}
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public long getContact() {
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return contact;
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}
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public void setContact(long contact) {
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this.contact = contact;
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}
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public String getGender() {
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return gender;
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}
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public void setGender(String gender) {
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this.gender = gender;
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}
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}

‎src/main/java/model/User.java‎

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package model;
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public class User {
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private String username;
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private String password;
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@Override
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public String toString() {
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return "User [username=" + username + ", password=" + password + "]";
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}
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public String getUsername() {
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return username;
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}
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public void setUsername(String username) {
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this.username = username;
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}
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public String getPassword() {
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return password;
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}
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public void setPassword(String password) {
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this.password = password;
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}
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}

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