form based file upload using servlets

Please visit the following link:

http://www.roseindia.net/servlets/upload-image.shtml

Hi Everyone,

I wrote a program to upload an image file into specified directory. In my jsp page i take two input box one as text type and other one is file type as follows.

 <input type="text" name="CategoryName">
 <input type="file" name="txtImgName">

<form action="uploadservlet" enctype="multipart/form-data" method="POST">

<input type="text" name="CategoryName">
<input type="file" name="txtImgName"><br>
<input type="Submit" value="Upload File"><br>

</form>

public class Commonsfileuploadservlet extends HttpServlet {

    /** 
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    private static final String TMP_DIR_PATH = "c:\\tmp";
    private File tmpDir;
    private static final String DESTINATION_DIR_PATH = "/files";
    private File destinationDir;

    @Override
    public void init(ServletConfig config) throws ServletException {
        super.init(config);
        tmpDir = new File(TMP_DIR_PATH);
        tmpDir.getName();
        System.out.println("inside 0124 init function##########    " + tmpDir.getName());
        if (!tmpDir.isDirectory()) {
            System.out.println("inside 1111111111");
            throw new ServletException(TMP_DIR_PATH + " is not a directory");
        } else {
            System.out.println("tmpDir.isDirectory() is directory......");
        }

        System.out.println("after 22222#########");
        String realPath1 = getServletContext().getRealPath(DESTINATION_DIR_PATH);
        System.out.println("realpath 111111111 - > " + realPath1);
        String realPath = "d:\\tmp";

        System.out.println("after 3333######### real path" + realPath);
        destinationDir = new File(realPath);
        System.out.println("after 444#########");
        if (!destinationDir.isDirectory()) {
            System.out.println("insideeeeeeeee");
            throw new ServletException(DESTINATION_DIR_PATH + " is not a directory");
        } else {
            System.out.println("not directry again***********");

        }
        System.out.println("after destination#########");

    }

    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        String test="";
        test=request.getParameter("temptest");
        System.out.println("test---- > "+test);
        DiskFileItemFactory fileItemFactory = new DiskFileItemFactory();

        fileItemFactory.setSizeThreshold(1 * 1024 * 1024); //1 MB
        /*
         * Set the temporary directory to store the uploaded files of size above threshold.
         */
        fileItemFactory.setRepository(tmpDir);

        ServletFileUpload uploadHandler = new ServletFileUpload(fileItemFactory);
        try {
            List items = uploadHandler.parseRequest(request);
            Iterator itr = items.iterator();
            while (itr.hasNext()) {
                FileItem item = (FileItem) itr.next();
                if (item.isFormField()) {
                    out.println("File Name = " + item.getFieldName() + ", Value = " + item.getString());
                } else {
                    //Handle Uploaded files.
                    out.println("Field Name = " + item.getFieldName()
                            + ", File Name = " + item.getName()
                            + ", Content type = " + item.getContentType()
                            + ", File Size = " + item.getSize());
                    String catadd = "s" + "16" + ".png";
                    //  File file = new File(destinationDir, item.getName());
                    File file = new File(destinationDir, catadd);
                    item.write(file);
                    System.out.println("File write successfullyYYYYYY...0201.....###################");
                }
                out.close();
            }
        } catch (FileUploadException ex) {
            log("Error encountered while parsing the request", ex);
        } catch (Exception ex) {
            log("Error encountered while uploading file", ex);
        }

    }

in above servlet i m not able to get "CategoryName" value of jsp input box.but when i remove <enctype="multipart/form-data"> like :
<form action="Commonsfileuploadservlet" method="POST">

then i get the "CategoryName" value.can anyone please suggest me what thing i m missing?

thanks Ashwani

Hi evryone,

I wrote a program to upload an image file into specified directory. In my jsp page i take two input box one as text type and other one is file type as follows.

 <input type="text" name="CategoryName">
 <input type="file" name="txtImgName">

<form action="uploadservlet" enctype="multipart/form-data" method="POST">

<input type="text" name="CategoryName">
<input type="file" name="txtImgName"><br>
<input type="Submit" value="Upload File"><br>

</form>

public class Commonsfileuploadservlet extends HttpServlet {

    /** 
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    private static final String TMP_DIR_PATH = "c:\\tmp";
    private File tmpDir;
    private static final String DESTINATION_DIR_PATH = "/files";
    private File destinationDir;

    @Override
    public void init(ServletConfig config) throws ServletException {
        super.init(config);
        tmpDir = new File(TMP_DIR_PATH);
        tmpDir.getName();
        System.out.println("inside 0124 init function##########    " + tmpDir.getName());
        if (!tmpDir.isDirectory()) {
            System.out.println("inside 1111111111");
            throw new ServletException(TMP_DIR_PATH + " is not a directory");
        } else {
            System.out.println("tmpDir.isDirectory() is directory......");
        }

        System.out.println("after 22222#########");
        String realPath1 = getServletContext().getRealPath(DESTINATION_DIR_PATH);
        System.out.println("realpath 111111111 - > " + realPath1);
        String realPath = "d:\\tmp";

        System.out.println("after 3333######### real path" + realPath);
        destinationDir = new File(realPath);
        System.out.println("after 444#########");
        if (!destinationDir.isDirectory()) {
            System.out.println("insideeeeeeeee");
            throw new ServletException(DESTINATION_DIR_PATH + " is not a directory");
        } else {
            System.out.println("not directry again***********");

        }
        System.out.println("after destination#########");

    }

    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        String test="";
        test=request.getParameter("temptest");
        System.out.println("test---- > "+test);
        DiskFileItemFactory fileItemFactory = new DiskFileItemFactory();

        fileItemFactory.setSizeThreshold(1 * 1024 * 1024); //1 MB
        /*
         * Set the temporary directory to store the uploaded files of size above threshold.
         */
        fileItemFactory.setRepository(tmpDir);

        ServletFileUpload uploadHandler = new ServletFileUpload(fileItemFactory);
        try {
            List items = uploadHandler.parseRequest(request);
            Iterator itr = items.iterator();
            while (itr.hasNext()) {
                FileItem item = (FileItem) itr.next();
                if (item.isFormField()) {
                    out.println("File Name = " + item.getFieldName() + ", Value = " + item.getString());
                } else {
                    //Handle Uploaded files.
                    out.println("Field Name = " + item.getFieldName()
                            + ", File Name = " + item.getName()
                            + ", Content type = " + item.getContentType()
                            + ", File Size = " + item.getSize());
                    String catadd = "s" + "16" + ".png";
                    //  File file = new File(destinationDir, item.getName());
                    File file = new File(destinationDir, catadd);
                    item.write(file);
                    System.out.println("File write successfullyYYYYYY...0201.....###################");
                }
                out.close();
            }
        } catch (FileUploadException ex) {
            log("Error encountered while parsing the request", ex);
        } catch (Exception ex) {
            log("Error encountered while uploading file", ex);
        }

    }

in above servlet i m not able to get "CategoryName" value of jsp input box.but when i remove <enctype="multipart/form-data"> like :
<form action="Commonsfileuploadservlet" method="POST">

then i get the "CategoryName" value.can anyone please suggest me what thing i m missing?

thanks Ashwani