Usage of enctype multipart/form-data in multi data type form

0
votes

I have html page which contains 3 file input and 3 text inputs. If I use enctype = multipart/form-data in jsp page I am not able to get the test input form fields. These values always show null. If I remove enctype from post form in jsp, I can get the text field inputs but in this case I cannot upload files. So my question is is it possible to have multiple input fields with file input and if yes how to get the text input field names??

Any help on this is appreciated..

Below is the html code

<html>
<body>
<form method="post" action="upload.jsp" enctype="multipart/form-data">
  Office Name: <input type="text" name="officeName" />  <br>
  Doc. Description : <input type="text" name="docDesc" />   <br>
  Document 1 :  <input type="file" name="doc1" />   <br>
  Document 2 :  <input type="file" name="doc2" />   <br>
  Document 3 :  <input type="file" name="doc3" />   <br>
  Remarks : <input type="text" name="remarks" />    <br>

  <br>
    <input type="submit" value="submit" />
</form>

And i am retrieving text and file inputs as

strOffficeName=Request.getParameter("officeName");
strDocDescription=Request.getParameter("docDesc");
strDoc1Path=Request.getParameter("doc1");
strDoc2Path=Request.getParameter("doc2");
strDoc3Path=Request.getParameter("doc3");
strRemarks=Request.getParameter("remarks");
3
javahtmlpostfile-uploadenctype
can you show your codes ? - Raptor
How are you retrieving the text inputs? And how are you retrieving the file inputs? - mthmulders
@Shivan Raptor :Please check the edited question. I have posted the code.. - Shrikant
@mthmulders : Please check the edited question - Shrikant
check this tutorial: roseindia.net/jsp/file_upload/Sinle_upload.xhtml.shtml - Raptor

3 Answers

1
votes

I would take a look at Apache Commons FileUpload. It has a User Guide that explains how to get file uploads from your request.

The section "Processing the uploaded items" shows an example how to process both file uploads and text inputs.

0
votes

Create a class called fileUploader which returns ServletFileUpload object

private FileUploader()
{

}

public static synchronized ServletFileUpload getservletFileUploader(String tempDir, int maxSizeInMB) 
{
    if(uploader == null)
    {
        DiskFileItemFactory factory = new DiskFileItemFactory();

        factory.setSizeThreshold(1024 * 1024);
        factory.setRepository(new File(tempDir));

        uploader = new ServletFileUpload(factory);

        uploader.setFileSizeMax(maxSizeInMB * 1024 * 1024);
    }

    return uploader;
}

Now you can process a request and read all the data. It handles the files uploaded as well as other form data.

protected MultiPartFormData handleMultiPartRequest(HttpServletRequest request)
throws FileSizeLimitExceededException
{
    if(!isMultipartRequest(request))
        return null;

    ServletFileUpload upload = FileUploader.getservletFileUploader(tempDir, 50);
    MultiPartFormData data = new MultiPartFormData();
    try
    {
        List<FileItem> items = upload.parseRequest(request);

        for (FileItem item : items) 
        {
            if(item.isFormField())
            {
                data.getParameters().put(item.getFieldName(), item.getString());
            }
            else
            {
                String filename = item.getName();

                //Internet explorer and firefox will send the file name differently
                //Internet explorer will send the entire path to the file name including 
                //the backslash characters etc ... we should strip it down
                //THIS IS HACKY
                if(filename.indexOf("\\") != -1)
                {
                    int index = filename.lastIndexOf("\\");
                    filename = filename.substring(index + 1);
                }


                if(filename == null || filename.equals(""))
                {
                    //do nothing 
                }
                else
                {
                    File uploadFile = new File(uploadDir + File.separator + randomFileName);
                    item.write(uploadFile);

                                            data.addFile(item.getFieldname(), item.getString());
                }
            }
        }
    }
    catch(FileSizeLimitExceededException e)
    {
        throw e;
    }
    catch(Exception e)
    {
        e.printStackTrace();

    }


    return data;
}

After parsing the request I am storing it in some object called MultipartFormData which can be used to get request parameters

public class MultiPartFormData {

private Hashtable<String, String> parameters;
    private Hashtable<String, String> uploadedFiles;

public MultiPartFormData()
{
    this.parameters = new Hashtable<String, String>();
    this.uploadedFiles = new Hashtable<String, String>();
}

public Hashtable<String, String> getParameters() {
    return parameters;
}
public void setParameters(Hashtable<String, String> parameters) {
    this.parameters = parameters;
}
    public void getParameter(String paramName) {
          if(this.parameters.contains(paramName))
                 return tyhis.parameters.get(paramName);
          return null;
    }
    public void addFile(String key, String filename) {
        uploadedFile.put(key, filename);
    }
    public void getFilename(String key) {
        uploadedFile.get(key);
    }
}
0
votes

I had a similar problem, and in that case the reason was: The IT department had set some settings on their firewall that stopped the execution of some of my scripts and only for some of the clients. The halt sent the browser to the root web page of my server. They were not able to explain in detail, but after opening up some filters, it all works as intended. WAMP, PHP7.