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Extract parameters and their values ​​from a query string in Java

So let's say I have a line like

"param1=value1&param2={"url":"http://somesite.com?someparam=somevalue&someparam1=somevalue1"}&param3=value3"

and I need this:

param1: value1

param2: {"url":"http://somesite.com?someparam=somevalue&someparam1=somevalue1"}

param3: value3

What would be the best approach to parsing in Java? Until now, I couldn't find a solution with the Java standard libraries and I don't want to reinvent the wheel.

I've tried (but it doesn't work if I only put query parameters in there like mine):

String url = "http://www.example.com/something.html?one=11111&two=22222&three=33333";
List<NameValuePair> params = URLEncodedUtils.parse(new URI(url), "UTF-8");

for (NameValuePair param : params) {
    System.out.println(param.getName() + " : " + param.getValue());
}
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1 answer


Why don't you use something like a regex:

for example like this one ".*\\?param1=(.*)&param2=(.*)&param3=(.*)$"

, it works for your sample url, so I added .*\\?

part;)



and this will work for the first sample ( "param1=value1&param2={"url":"http://somesite.com?someparam=somevalue&someparam1=somevalue1"}&param3=value3"

->  param1=(.*)&param2=(.*)&param3=(.*)$

Of course, if your parameter names are not something you don't know about

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