Email Sending Servlet

EmailSendingServlet.java

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package email;

import java.io.IOException;
 
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
/**
 * A servlet that takes message details from user and send it as a new e-mail
 * through an SMTP server.
 *
 * @author www.codejava.net
 *
 */
@WebServlet("/EmailSendingServlet")
public class EmailSendingServlet extends HttpServlet {
    private String host;
    private String port;
    private String user;
    private String pass;
 
    public void init() {
        // reads SMTP server setting from web.xml file
        ServletContext context = getServletContext();
        host = context.getInitParameter("host");
        port = context.getInitParameter("port");
        user = context.getInitParameter("user");
        pass = context.getInitParameter("pass");
    }
 
    protected void doPost(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        // reads form fields
        String subject = request.getParameter("subject");
        String recipient = request.getParameter("email");
        String content = request.getParameter("message");
 
        String resultMessage = "";
 
        try {
            EmailUtility.sendEmail(host, port, user, pass, recipient, subject,content);
            resultMessage = "The e-mail was sent successfully";
        } catch (Exception ex) {
            ex.printStackTrace();
            resultMessage = "There were an error: " + ex.getMessage();
        } finally {
            response.getWriter().print("Send email to " + recipient + "<br/>with subject : "
                    +subject+"<br/>Message : "+content);
            response.getWriter().print("<br/>Status : "+resultMessage);
        }
    }
}

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.1" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd">
    <session-config>
        <session-timeout>
            30
        </session-timeout>
    </session-config>
    <context-param>
        <param-name>host</param-name>
        <param-value>smtp.gmail.com</param-value>
    </context-param>
    <context-param>
        <param-name>port</param-name>
        <param-value>587</param-value>
    </context-param>
    <context-param>
        <param-name>user</param-name>
        <param-value>USER_EMAIL</param-value>
    </context-param>
    <context-param>
        <param-name>pass</param-name>
        <param-value>USER_PASSWORD</param-value>
    </context-param>
    <welcome-file-list>
        <welcome-file>send_email.jsp</welcome-file>
    </welcome-file-list>
</web-app>