java sevlet

write a program in servlet to take username & password from html file & print the appropriate message to user

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November 12, 2010 at 4:18 PM

Hi Friend,

Try the following code:

1)login.html:

<html>
<head>
</head>
<body>
<form name="form" method="post" action="http://localhost:8080/examples/login">
<br><br>
<table align="center"><tr><td><h2>Login Authentication</h2></td></tr></table>
<table width="300px" align="center" style="border:1px solid #000000;background-color:#efefef;">
<tr><td colspan=2></td></tr>
<tr><td colspan=2>&nbsp;</td></tr>
  <tr>
    <td><b>Login Name</b></td>
    <td><input type="text" name="username" value=""></td>
  </tr>
  <tr>
    <td><b>Password</b></td>
    <td><input type="password" name="password" value=""></td>
  </tr>
  <tr>
    <td></td>
    <td><input type="submit" name="Submit" value="Submit"></td>
  </tr>
 <tr>
 <td></td>
 </tr>
</table>
</table>
</form>
</body>
</html>

2)login.java:

import java.io.*;
import java.io.PrintWriter;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class login extends HttpServlet {

public  void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
String userid = request.getParameter("username");
String password = request.getParameter("password");
try {
Class.forName("com.mysql.jdbc.Driver");
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost/test", "root", "root");

String query = "SELECT * FROM user_details WHERE username = '"+userid+"' and password = '"+password+"'";
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery(query);
String username="";
String pwd="";
while(rs.next()){
 username=rs.getString("username");
 pwd=rs.getString("password") ;
}
if((username.equals(userid))&&(pwd.equals(password))){
out.println("<html>");
out.println("<head><title>Login Success</title></head>");
out.println("<body>");
out.println("<p>Login Success! Welcome " + userid);
out.println("</body></html>");
} 
else{
out.println("<html>");
out.println("<head><title>No Such User</title></head>");
out.println("<body>");
out.println("<p>Login Failed! ");
out.println("<p>No such user exists ");
out.println("</body></html>");
out.println("<a href=\"login.html\">Click here to login</a>");
out.close();
conn.close();
}
} catch (Exception e) {
System.out.println("Error" + e.getMessage());
}

out.close();
}
}

Thanks

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