在Servlet中上传Excel

Question

I'm trying to upload an excel in servlet and process it. While uploading I set enctype=“multipart/form-data” in my form. But in my servlet .isMultiPart(request) returns false.

JSP code:

function fSubir()

{

fFreezeButtons();

this.document.forms[0].action="../servlet/renault.saf.demandepiece.demandes.servlet.AjouterPoste";

if (this.document.forms[0].Flag.value == "1")

{

this.document.forms[0].Flag.value = "0";

this.document.forms[0].submit();

}

}

Select .xlsx type File :

<input type="submit" value="upload" onclick="fSubir()"/>

My .Jsp also has another form of get method which doesn't have any enctype.

Servlet code;

public class AjouterPoste extends SapprServlet{

/**
 * 
 */
private static final long serialVersionUID = 1L;
private final String UPLOAD_DIRECTORY = "/appli01/safdev01/saf_cl2/test/";

public void performTask(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
    try {
        System.out.println("inside the AjouterPoste class - performTask");
        boolean isMultipart = ServletFileUpload.isMultipartContent(request);
        System.out.println("Inside doPost:"+isMultipart+":"+request);

Please find the parts of my code on which I'm trying to upload a file.

Answer 1

When you submit a form having multipart/form-data , you can't use request.getParameter(paramName) . Instead use the code below (part of the Apache FileUpload library)

try {
        List<FileItem> items = new ServletFileUpload(new DiskFileItemFactory()).parseRequest(request);
        for (FileItem item : items) {
            if (item.isFormField()) {
                // this part is used instead of request.getParameter
                String fieldName = item.getFieldName();
                String fieldValue = item.getString();
                // do something here
            } else {
                // this is the file processing part
                String fieldName = item.getFieldName();
                String fileName = FilenameUtils.getName(item.getName());
                InputStream fileContent = item.getInputStream();
       ...
            }
        }
    } catch (FileUploadException e) {
        throw new ServletException("exception", e);
    }

You can tell that a specific item is a regular form item (and not a file) by checking that FileItem.isFormField() method returns true .