Reset password link in java
<p>I am currently implementing a forgot password function in a Java project. my methodology is,</p>

<ol>
<li><p>User clicks the forgot password link.</p></li>
<li><p>In the forgot password page, system prompts the user to enter the email<br>
address he/she has registered in to the system.</p></li>
<li><p>Email which includes the given email address with reset password page link.</p></li>
<li><p>User clicks the link and he/she get redirected to a page(reset password) 
where user can enter his new password.</p></li>
<li><p>In Reset Password page, the field "email address" is filled automatically<br>
and it cannot be changed because its disabled.</p>

<p>Then user enter his new password and the field related to the email 
address in the database is updated.</p></li>
</ol>

<p>I tried this in my code but in my reset password page I didnt get the email id of the user who wants to change the password.</p>

<p>MailUtil.java</p>

<pre><code>package com.example.controller;

import java.io.IOException;
import java.security.Security;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;

import javax.mail.Message;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;

import com.example.util.Database;

public class MailUtil {
    private static final String USERNAME = "test@gmail.com";
    private static final String PASSWORD = "test";
    private static final String SUBJECT = "Reset Password link";

    private static final String HOST = "smtp.gmail.com";
    private static final String PORT = "465";

    String email;

    public MailUtil() {
    // TODO Auto-generated constructor stub
    email = this.email;
}

    public boolean sendMail(String to, HttpServletRequest request) throws SQLException, ServletException, IOException{
        Connection conn = Database.getConnection();
        Statement st = conn.createStatement();
        String sql = "select * from login where email = '" + to + "' ";
        ResultSet rs = st.executeQuery(sql);
        String pass = null;
        String firstName = null;
        while(rs.next()){
            pass = rs.getString("pass");
            firstName = rs.getString("firstName");
        }

        if(pass != null){
            setEmailId(to);         
            Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider());
            Properties props = new Properties();
            props.put("mail.smtp.host", HOST);
            props.put("mail.stmp.user", USERNAME);
            //  If you want you use TLS
            //props.put("mail.smtp.auth", "true");

            props.put("mail.smtp.starttls.enable", "true");
            props.put("mail.smtp.password", PASSWORD);
            //  If you want to use SSL
            props.put("mail.smtp.port", PORT);
            props.put("mail.smtp.socketFactory.port", PORT);
            props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
            props.put("mail.smtp.auth", "true");

            Session session = Session.getInstance(props, new javax.mail.Authenticator() {
                protected PasswordAuthentication getPasswordAuthentication() {
                    String username = USERNAME;
                    String password = PASSWORD;
                    return new PasswordAuthentication(username, password);
                }
            });

            String from = USERNAME;
            String subject = SUBJECT;
            MimeMessage msg = new MimeMessage(session);
            try{
                msg.setFrom(new InternetAddress(from));
                InternetAddress addressTo = new InternetAddress(to);
                msg.addRecipient(Message.RecipientType.TO, new InternetAddress(to));
                msg.setSubject(subject);                
                String vmFileContent = "Hello User, &lt;br&gt;&lt;br&gt; Please Click &lt;a href='http://192.168.15.159:8080/SampleLogin/new-password.jsp&gt;&lt;strong&gt;here&lt;/strong&gt;&lt;/a&gt; to reset your password. &lt;br&gt;&lt;br&gt;&lt;br&gt; Thanks,&lt;br&gt;ProAmbi Team";

                //  Send the complete message parts
                msg.setContent(vmFileContent,"text/html");
                Transport transport = session.getTransport("smtp");
                transport.send(msg);

                System.out.println("Sent Successfully");
                return true;
            }catch (Exception exc){
                System.out.println(exc);
                return false;
            }
        }else{
            //System.out.println("Email is not registered.");
            request.setAttribute("errorMessage", "User with this email id doesn't exist.");         
            return false;
        }
    }

    public String getEmailID() {
        return email;
    }
    public void setEmailId(String email) {
        this.email = email;
    }
}
</code></pre>

<p>And My new-password.jsp.</p>

<pre><code>&lt;%
    MailUtil mail = new MailUtil();
    String email = mail.getEmailID();
    System.out.println("---&gt; "+email);
%&gt;
</code></pre>

<p>But I got the null value rather than email id.</p>

<p>Can you pleas help me the solve this problem or get any other option to do this.</p>