One of the biggest disadvantages for C# developer is that Lucene is entirely written in Java. One of the most well known one is Lucene ( ) – full-text search engine library. One of the possible ones is to use third-party library. This is where the developers need to find suitable solution. It is not easy to build a search tool which will be more than just simple SQL query with couple of LIKE clausules. In this post I will try to shortly present capabilities of Lucene. This way of providing searching is not very sophisticated and dedicated developer would like to provide his/her own search engine. Most of them are using most popular search engines which search something on the website – I think about Bing, Google etc. If either the startBookmark or the endBookmark refer to an external page or execute an action then an OutlineNotLocalException will be thrown to indicate to the user that the bookmark is not valid.Nowadays it is common that you see search boxes on websites. If they are different then it is not possible for the PDFTextStripper to determine that pages so it will include the entire document. This is a special case! If the startBookmark and endBookmark are exactly the same then no text will be extracted. Text extraction will begin on the first page and stop at the end of the page that this bookmark points to.īecause the PDFTextStripper cannot determine a start page based on the bookmark, it will start on the first page and go until the end of the document.īecause the PDFTextStripper cannot determine a end page based on the bookmark, it will start on the first page and go until the end of the document. Text extraction will begin on the page that this bookmark points to and go until the end of the document. This is the default, the properties have no effect on the text extraction. The table below will describe how PDFBox behaves in the various scenarios: Start Bookmark
Lucene pdf search example pdf#
Lucene pdf search example how to#
If you are not familiar with how to use bookmarks in PDFBox then you should review the Bookmarks page. It is also possible to limit the extracted text to be between two bookmarks in the page. By default all pages in the pdf document are extracted. If you wanted to start on page 2 and extract to the end of the document then you would just set the startPage property. The startPage and endPage properties of PDFTextStripper are 1 based and inclusive. For example, to only extract text from the second and third pages of the PDF document you could do this: PDFTextStripper stripper = new PDFTextStripper() The simplest is to specify the range of pages that you want to be extracted.
There are several ways that we can limit the text that is extracted during the extraction process. It is possible for users to utilize or extend the PDFTextStripper class to meet some of these requirements. Some applications will have complex text extraction requiments and neither the command line application nor the LucenePDFDocument will be able to fulfill those requirements. This approach is very simple and should be sufficient for most users, if not then you can use some of the advanced text extraction techniques described in the next section. The LucenePDFDocument automatically extracts a variety of metadata fields from the PDF to be added to the index, the javadoc shows details on those fields.
Now that you hava a Lucene Document object, you can add it to the Lucene index just like you would if it had been created from a text or HTML file. Document luceneDocument = LucenePDFDocument.getDocument(. PDFBox provides a simple approach for adding PDF documents into a Lucene index. In order for Lucene to be able to index a PDF document it must first be converted to text. Lucene is an open source text search library from the Apache Jakarta Project. This functionality is encapsulated in the and can be easily executed on the command line with. One of the main features of PDFBox is its ability to quickly and accurately extract text from a variety of PDF documents.
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