Question

正如标题所说，使用servlet时不会创建文件。我有一个简单的Web应用程序，我想从HTML中获取输入并将其写入.txt文件。问题是，一切运行良好，我没有得到任何错误或异常，它只是没有创建文本文件。我使用了相同的代码（用于创建文本文件），并将其测试到一个单独的类中，它完美地运行。问题是当我尝试在servlet中创建一个文本文件时。这是我的代码：

@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

显然，它在Apache Tomcat / bin文件夹中创建文件，而不是在项目文件夹中。我的错。感谢JB Nizet的帮助。

使用Servlet时无法创建文本文件

1 个答案: