How to get request parameter to an array in Java, in the style of PHP and Rails?

Question

The situation is as follows:

page.jsp?var[0]=foo&var[1]=bar

How can this be retrieved in an array in Java?

The following:

page.jsp?var=foo&var=bar

I know can be retrieved using request.getParameterValues("var")

Any solutions for the above though?

No, it can be POST or GET, as long as it's retrievable via the request object. — adnan.
– adnan., Commented May 14, 2009 at 12:50

Pierre · Accepted Answer · 2009-05-13 22:14:17Z

4

Map<Integer,String> index2value=new HashMap<Integer,String>();

for (Enumeration e = request.getParameterNames(); e.hasMoreElements() ;)
 {
 String param= e.nextElement().toString();
 if(!param.matches("var\[[0-9]+\]")) continue;
 int index= (here extract the numerical value....)
 index2value.put(index,request.getParameter(param));
 }

Hope this helps.

answered May 13, 2009 at 22:14

Pierre

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2 Comments

adnan. Over a year ago

I was hoping there would have been a more "automatic" way. But this will have to do. Thanks.

Mathias Zaja Over a year ago

param.matches("var[[0-9]+]") does not compile. Invalid escape sequence (valid ones are \b \t \n \f \r \" \' \\ )

sal · Accepted Answer · 2011-07-15 18:08:46Z

4

HashMap m = request.getParameterMap();
Set k = m.keySet();
Set v = m.entrySet();
Object o[] = m.entrySet().toArray();

That will get you a Map call m with K,V pairs and both a set of keys and set of values. You can iterate those sets almost like an array. You can also use toArray to turn it into an array.

edited Jul 15, 2011 at 18:08

answered May 13, 2009 at 21:41

sal

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