CODEWITHSUNDEEP
javaimagetomcatservletsupload
Andrea Catania
Andrea Catania

Reputation: 1383

Uploading images using Servlet 3.0

I have a simple form with enctype "multipart"; I am using this to upload an image to my server. I have two possible solutions, but neither of them are complete.

First solution:

FileItemIterator iterator = upload.getItemIterator( request );

while( iterator.hasNext() ){
    FileItemStream item = iterator.next();

    if( item.isFormField() ){
          // store IMG
    }

} // ~while( iter.hasNext() )

In this solution, I can't get the dimensions of the uploaded file, but I can get if it's a form field or not (using item.isFormField())

My second solution uses the Servlet 3.0 API:

for( Part part: request.getParts() ){
    System.out.println( part.getSize() );
}

Here I can get the size of the uploaded image, but I can't tell whether it's a simple form field or not.

What am I missing?

What you need for help me?

Upvotes: 1

Views: 738

Answers (1)

user957654
user957654

Reputation:

As mentioned in the documentation of the FileItemStream

the isFormField() method tells whether if this is a simple form field returns true , otherwise return false .

so for upload image it will return false

so you should do the following : 

  if(! item.isFormField() ){
              // store IMG
        }else {

//simple form field.
       }

and refer to this answer here to see how to convert an InputStream to byte[] to know how many bytes are there in your uploaded file .

if you are using servlet 3 do like the following :

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    String username= request.getParameter("username"); // Retrieves <input type="text" name="username">
    Part filePart = request.getPart("file"); // Retrieves <input type="file" name="file">
    String filename = filePart.getName();
    InputStream filecontent = filePart.getInputStream();
    // ... (do your job here)
}

and give me some feedback .

Hope that helps .

Upvotes: 1

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