使用Servlet时无法创建文本文件

Question

As title says, the file is not created when using servlets. I have a simple web application, and I want to take input from the HTML and write them down into a .txt file. The problem is that, everything runs good, and I don't get any error or exception, it just doesn't create the text file. I took the same code (for creating the text file) and I tested it into a separate class and it works perfectly. The problem is when I try to create a text file in the servlet. This is my code:

@WebServlet("/home")
public class HomePage extends HttpServlet
{
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
    {
        response.sendRedirect("/home.html");
    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
    {
        String add = request.getParameter("buttonAdd");
        String read = request.getParameter("buttonRead");
        String update = request.getParameter("buttonUpdate");
        String delete = request.getParameter("buttonDelete");

        if(add != null)
        {
            String title = request.getParameter("dvd_title");
            String year = request.getParameter("dvd_year");
            String price = request.getParameter("dvd_price");

            if(!title.equals("") && !year.equals("") && !price.equals(""))
            {
                if(!Character.isDigit(title.charAt(0)))
                {
                    if (isNumeric(year) && isNumeric(price))
                    {
                        try
                        {
                            List<String> lines = Arrays.asList("Title: " + title, "Year: " + year, "Price: " + price);
                            Path file = Paths.get("DVD - " + title + ".txt");
                            Files.write(file, lines, Charset.forName("UTF-8"));
                        }
                        catch(IOException e)
                        {
                            e.printStackTrace();
                        }

                    }
                    else
                    {
                        response.setContentType("text/html");
                        PrintWriter out = response.getWriter();
                        out.println("Year and price must be numbers");
                    }
                }
                else
                {
                    response.setContentType("text/html");
                    PrintWriter out = response.getWriter();
                    out.println("Title cannot start with a number");
                }
            }
        }

        if(read != null)
        {
            System.out.println("2");
        }

        if(update != null)
        {
            System.out.println("3");
        }

        if(delete != null)
        {
            System.out.println("4");
        }
    }

    private static boolean isNumeric(String s)
    {
        return s != null && s.matches("[-+]?\\d*\\.?\\d+");
    }
}

Answer 1

Apparently it creates the file in the Apache Tomcat/bin folder, and not in the project folder. My mistake. Thanks JB Nizet for the help.