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Here is a link that tells us how to extract json from a text!
Extract JSON from text
But I need it use Java with high performance, and I really don’t want use the three-part plugin to help with.
Who can help me? it got me crazy. Thank you all.
Do you really have a performance problem? Hard to know if you haven’t measured it. And that’s hard to do if you haven’t written any code yet. Look you aren’t going to write a super fast JSON parser that no one else hasn’t already done for you. You’re roughly going to have to do the same amount of work that anyone who created a 3rd party plugin has already done. Stop worrying about performance and go get a library to do this for you. There are plenty out there. Plain vanilla JSONObject fits the bill.
http://json.org
Personally I like http://flexjson.sourceforget.net it has descent performance and good feature set.