servlet db connectivity
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This document discusses connecting a Java servlet application to a MySQL database. It includes code for a registration servlet that takes user input from a registration form, connects to the database, and inserts the user details. It also includes code for a login servlet that authenticates user credentials from the database and redirects to a success page if valid.
servlet db connectivity
- 1. Servlet/JSP DB Connection Arulkumar Varatharajan – AP/CSE 1
- 2. DB 2
- 3. register.html 3 <form action="register" method="post"> Name:<input type="text" name="userName"/><br/> Password:<input type="password" name="password"/><br/> Email Id:<input type="text" name="email" /><br/> Language: <select name="language"> <option>Hindi</option> <option>English</option> <option>French</option> </select> <br/> <input type="submit" value="Submit"/> </form></body></html>
- 4. 4 package com.jwt.servlet; import java.io.IOException; import java.io.PrintWriter; import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class RegisterServlet extends HttpServlet { public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html"); PrintWriter out = response.getWriter(); RegisterServlet.java
- 5. 5 String n = request.getParameter("userName"); String p = request.getParameter("password"); String e = request.getParameter("email"); String c = request.getParameter("language"); try { Class.forName("com.mysql.jdbc.Driver"); Connection con = DriverManager.getConnection( "jdbc:mysql://localhost:3306/servlet", "root", "mukesh"); PreparedStatement ps = con .prepareStatement("insert into USERDETAILS values(?,?,?,?)"); ps.setString(1, n); ps.setString(2, p); ps.setString(3, e); ps.setString(4, c); RegisterServlet.java
- 6. 6 int i = ps.executeUpdate(); // returns the binary value 0/1 if (i > 0) out.print("You are successfully registered..."); } catch (Exception e2) { System.out.println(e2); } out.close(); } } RegisterServlet.java
- 8. 8 output
- 9. 9 <%@page import="java.sql.ResultSet"%> <%@page import="java.sql.Statement"%> <%@page import="java.sql.Connection"%> <%@page import="com.example.util.DBUtil"%> <% String userName = request.getParameter("username"); String password = request.getParameter("password"); Connection con = DBUtil.getMySqlConnection(); Statement st = con.createStatement(); ResultSet rs; rs = st.executeQuery("select * from EMPLOYEE where USER_NAME='" + userName + "' and PASSWORD='" + password + "'"); if (rs.next()) { session.setAttribute("username", userName); response.sendRedirect("success.jsp"); } else { out.println("Invalid password <a href='index.jsp'>try again</a>"); } %> Login.jsp
- 10. 10 <%@page import="java.sql.Statement"%> <%@page import="java.sql.Connection"%> <%@page import="com.example.util.DBUtil"%> <% String userName = request.getParameter("username"); String password = request.getParameter("password"); String firstName = request.getParameter("firstname"); String lastName = request.getParameter("lastname"); String email = request.getParameter("email"); Connection con = DBUtil.getMySqlConnection(); Statement st = con.createStatement(); int i = st.executeUpdate registration.jsp
- 11. 11 ("insert into EMPLOYEE (FIRST_NAME, LAST_NAME, EMAIL, USER_NAME, PASSWORD) values (‘”+ firstName+ "',‘”+ lastName+ "',‘”+ email+ "',‘”+ userName+ "',‘”+ password+ "')"); if (i > 0) { response.sendRedirect("welcome.jsp"); } else { response.sendRedirect("index.jsp"); } %> Login.jsp
- 12. 12 Login.jsp
- 13. 13 success.jsp