Liferay: how to delete uploaded files in liferay document library folder programmatically? -

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i need help. know how clear uploaded files data/document_library folder. example develop foto upload portlet. , when user upload new foto, previous should deleted. here example of abs example image url. http://localhost:8080/image/journal/article?img_id=30634 how can programatically remove files mapped such urls?

update

after analyzing liferay database tables (image , etc.) have come desicion:

if (stringutils.isnotempty(portraiturl)) {                 pattern pattern = pattern.compile("([0-9]+)$");                 matcher matcher = pattern.matcher(portraiturl);                 if (matcher.find()) {                     imagelocalserviceutil.deleteimage(long.valueof(matcher.group(0)));                 }             }

regex search image id in portrait url http://localhost:8080/image/journal/article?img_id=30634


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