How to Get the query data dynamically on the site ? How to crawl dynamic website data ?

currently see a very nice site , but requires input parameters and query to query the results, it is equivalent to the result of the query from the database , there are no tools or source can get all the data at one time among the local file or a local database? httplient? was the first to get his circulation static html file, and then extracted from a page of data ? How to crawl dynamic website data heroes think is how to do ?
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not so simple. . You can choose to analyze what the real request after a search condition , and the rest is httpclient analog transmission requests.
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I think it is not a problem to take the data , the main difficulty in the analysis of the law of your request
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caught dynamic interface calls the equivalent of a page
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analog data request < br>