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Java parse URL params

Posted on 2008-10-25
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Last Modified: 2013-11-23
Hi,
Can someone tell me how I can parse Get values from a REST request like:
http://server.com/?&tag1=value1&tag2=value2...

There's gotta be a lib or something to let me break it down to an array and get something like:
value1 = array[tag1];
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Question by:ecuguru
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6 Comments
 
LVL 14

Expert Comment

by:Farzad Akbarnejad
ID: 22806250
Hello,
Here is sample code:

public class ExampleServlet extends HttpServlet {
    protected void service(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
      String param1 = request.getParameter("tag1");
      // Now param1 holds value1
     }
}
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LVL 59

Expert Comment

by:Kevin Cross
ID: 22806275
You can get a listing of parameter names OR if you use same parameter name like:

tag=value1&tag=value2&tag=value3

You can get an array using the getParameterValues, otherwise you have to get each param specifically like FarzadA has shown.

http://java.sun.com/j2ee/sdk_1.3/techdocs/api/javax/servlet/ServletRequest.html
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Author Comment

by:ecuguru
ID: 22869536
My java app handles web requests, it's not a servlet.  
Is there a way to make this work without the servlet aspect?  
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LVL 59

Expert Comment

by:Kevin Cross
ID: 22869753
Maybe this will be more helpful for REST.

http://developer.yahoo.com/java/howto-parseRestJava.html

So are you getting the entire request as a string as shown in example?
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Author Comment

by:ecuguru
ID: 22870827
Yep.. I'm getting a string that is:
URLString = "http://localhost/server?&value1=value1&value2=value2"
And I'd like to parse for the values..  I'm putting it into a new URL, but can't find a good parser lib yet.
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LVL 14

Accepted Solution

by:
Farzad Akbarnejad earned 500 total points
ID: 22873961
Hello,
Maybe the following code will help you. Copy it into a class and run and test it. Post your comment if you have any question.

-FA

import java.util.HashMap;
import java.util.Map;
import java.util.StringTokenizer;
 
public class Main {
    public static void main(String[] args) {
        String URLString = "http://localhost/server?&tag1=value1&tag2=value2&tag3=value3";
        String valStr = URLString.substring(URLString.indexOf("?") + 1);
        StringTokenizer st = new StringTokenizer(valStr, "&");
        Map<String, String> arr = new HashMap();
        while (st.hasMoreTokens()) {
            String pair = st.nextToken();
            String lhs = pair.substring(0, pair.indexOf("="));
            String rhs  = pair.substring(pair.indexOf("=") + 1);
            arr.put(lhs, rhs);
        }
        
        System.out.println("tag1=" + arr.get("tag1"));
        System.out.println("tag2=" + arr.get("tag2"));
        System.out.println("tag3=" + arr.get("tag3"));
    }
}

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