java - Get specific text from huge string -

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i'm calling api , getting huge string of text (thousands of words in cases).

all want thumbnail_url.

here's sample:

  "thumbnail_url": "http://ecx.images-amazon.com/images/i/4171sq7vc4l.jpg", "type": "rich", "thumbnail_height": 379

so want http://ecx.images-amazon.com/images/i/4171sq7vc4l.jpg example. idea?

edit - thumnail_url in middle of big block of text, need search "thumbnail_url" or something, right?

what can use external json library such gson - think google or this fine

and use in such way : 

jsonobject json = (jsonobject)new jsonparser().parse(yourstring); system.out.println("url=" + json.get("thumbnail_url"));

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