A factory interface for creating {@link FileItem} instances. Factories can provide their own custom configuration, over and above that provided by the default file upload implementation.
Create a new {@link FileItem} instance from the supplied parameters and any local factory configuration.paramfieldName The name of the form field.paramcontentType The content type of the form field.paramisFormField true if this is a plain form field; false otherwise.paramfileName The name of the uploaded file, if any, as supplied by the browser or other client.returnThe newly created file item.
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