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Normally I would store URL parameters (GET request parameters) with a HashMap<String,String> but that doesnt account for URLs like test.php?request=id1&request=id2. Is there any data structure implemented in Java that can deal with this (and that I can query a parameter by name)? Alternatively, is there a single class somewhere that I can use (no libraries please)?

chacham15
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2 Answers2

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You can fake a multimap with something like this:

Map<String, List<String>> multimap = new HashMap<String, List<String>>();

See the 'MultiMap' section on this page for more information: The Map Interface

martinez314
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If you are talking about using java to write servlet or something, as far as I know, the HttpServletRequest class comes with the parameter as a list, and for each parameter, the value is an array. 

HttpServletRequest req=...
Enumeration<String> names=req.getParameterNames(); //
String para=names.getNextElement();//return "request"
String[] values=para.getParameterValues();// Should get["id1","id2"]

Now you certainly can use a list for it, like whiskeyspider suggested.

You can also make a wrapper on it before put into a hashMap,even just to serialize it. then we you need to use it, just unwrap it. But I would suggest use a list all the way, you can always just check the length to know if it is a single parameter or list.

Evilsanta
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