HTML/jsp + servlets + csv file storing the values

index.jsp
=======
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery UI Datepicker - Default functionality</title>
  <link rel="stylesheet" href="//code.jquery.com/ui/1.11.4/themes/smoothness/jquery-ui.css">
  <script src="//code.jquery.com/jquery-1.10.2.js"></script>
  <script src="//code.jquery.com/ui/1.11.4/jquery-ui.js"></script>
  <link rel="stylesheet" href="/resources/demos/style.css">
  <script>
  $(function() {
    $( "#datepicker" ).datepicker();
  });
  </script>
</head>
<body>
<form action="register">
 id :<input type="text" id="i" name="id"><br>
 name :<input type="text" id="n" name="name"><br>
 Location :<input type="text" id="l" name="location"><br>
<p>Date : <input type="text" id="datepicker" name="dob"></p>
 <input type="submit"   value="submit">
 </form>

</body>
</html>

web.xml
=======
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
  <display-name>JavascriptEx</display-name>
 
  <servlet>
  <servlet-name>firstsrv</servlet-name>
  <servlet-class>com.test.firstservlet.welcomeServlet</servlet-class>
  </servlet>
  <servlet-mapping>
  <servlet-name>firstsrv</servlet-name>
  <url-pattern>/register</url-pattern>
  </servlet-mapping>
 
 
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
</web-app>

welcomeServlet.java
===============
package com.test.firstservlet;

import java.io.File;
import java.io.FileWriter;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import java.text.Format;
import java.text.SimpleDateFormat;
import java.util.Date;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class welcomeServlet extends HttpServlet{

public void init()
 {
     System.out.println("init method call");
 }
public void doGet(HttpServletRequest req, HttpServletResponse response)throws ServletException{

try{
ServletContext servletContext = getServletContext();
       String filepath = servletContext.getRealPath("logs");
       PrintWriter out = response.getWriter();
       String file;
       /*String actionname = request.getParameter("actiontype");
       String status = request.getParameter("status");
       String dateandtime = request.getParameter("dateandtime");
       String user = request.getParameter("username");
       String space = request.getParameter("space");*/
       System.out.println("logpath >>>>>>>>>>"+filepath);
       String id=req.getParameter("id");
String name=req.getParameter("name");
String location=req.getParameter("location");
String dob=req.getParameter("dob");
System.out.println(id+" == "+name+" == "+location+" == "+dob);
     
SimpleDateFormat formatter;
       Date date = new Date();
       formatter = new SimpleDateFormat("MM/dd/yyyy");
       date = formatter.parse(dob);
       file = formatter.format(date);
       System.out.println(file);
     
       String filename = "abcdfile.csv";
       File f;
       f = new File(filepath,filename);
       if(!f.exists()){
           f.createNewFile();
           System.out.println("New file "+filename+" has been created in the following directory"+filepath);
           try {
             
               FileWriter fw = new FileWriter(f);
             
               fw.append("User ID");
               fw.append(',');
               fw.append("Name");
               fw.append(',');
               fw.append("Location");
               fw.append(',');
                fw.append("Date of Birth");
               fw.append('\n');
             
               fw.append(id);
               fw.append(',');
               fw.append(name);
               fw.append(',');
               fw.append(location);
               fw.append(',');
                fw.append(file);
               fw.append('\n');
             
               fw.flush();
               fw.close();
               out.println("<b>Csv file Successfully created.</b>");
             
           } catch (Exception ex) {
               ex.printStackTrace();
           }
       }else{
           System.out.println("File name already exists...");
           FileWriter fw = new FileWriter(f, true);
           fw.append(id);
           fw.append(',');
           fw.append(name);
           fw.append(',');
           fw.append(location);
           fw.append(',');
            fw.append(file);
           fw.append('\n');
            fw.flush();
           fw.close();
           out.println("<b>Csv file Successfully created.</b>");
       }
   
}catch(Exception e){

}
}
}