How to Create Login Servlet With Database Part – 2
by TechVidvan Team
Program 1
package dataflair;
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 javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class MyLogin extends HttpServlet {
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
PrintWriter out = response.getWriter();
try {
/* TODO output your page here. You may use following sample code. */
out.println("<!DOCTYPE html>");
out.println("<html>");
out.println("<head>");
out.println("<title>Servlet MyLogin</title>");
out.println("</head>");
out.println("<body>");
out.println("<center>");
out.println("<table border=1>");
out.println("<form method=post action=MyLogin>");
out.println("<tr>");
out.println("<th>User Name: </th>");
out.println("<td><input type=text name=txtuser></td>");
out.println("</tr>");
out.println("<tr>");
out.println("<th>Password: </th>");
out.println("<td><input type=password name=txtpass></td>");
out.println("</tr>");
out.println("<tr>");
out.println("<td></td>");
out.println("<td><input type=submit name=Submit>");
out.println("<input type=reset name=Reset></td>");
out.println("</tr>");
out.println("</form>");
out.println("</table>");
out.println("</center>");
out.println("</body>");
out.println("</html>");
}
catch(Exception e)
{
out.println(e);
}
}
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response); // Design code
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
processRequest(request, response); // Design code
PrintWriter out=response.getWriter();
Connection con=null;
PreparedStatement ps=null;
ResultSet rs=null;
try
{
Class.forName("com.mysql.jdbc.Driver");
// out.println("Driver load successfully..........");
}
catch(ClassNotFoundException e)
{
out.println(e);
}
try
{
con = DriverManager.getConnection("jdbc:mysql://localhost/dataflair", "root", "root@data");
// out.println("Database connection done successfully..........");
String user,pass;
user=request.getParameter("txtuser");
pass=request.getParameter("txtpass");
String sql;
sql="select * from emplogin where userid=? and password=?";
ps=con.prepareStatement(sql);
ps.setString(1, user);
ps.setString(2, pass);
rs=ps.executeQuery();
if(rs.next())
response.sendRedirect("user.html");
else
out.println("<font color=red size=4><center>Invalid user id or password</center></font>");
}
catch(SQLException e)
{
out.println(e);
}
}
@Override
public String getServletInfo() {
return "Short description";
}// </editor-fold>
}
Tags: advanced javaadvanced java practicaladvanced java programlogin applicationlogin application with servletlogin application with servlet and databaseservlet
TechVidvan Team
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