I'm having a solr query "http://localhost:8080/solr/select/?q=A".I need to read the parameter "q" in my java code.How can I get this?
Thanks, Marshal
3 Answers
request.getParameter("q"); would do the trick.
1 Comment
Marshal
I think i should be more specific.I'm trying to customizing QueryElevationComponent.java of solr. In that java file i need to get the q parameter.When i'm trying to use 'request.getParameter("q")',it showing error.Is there any packages that i should import or should i have to extend class?
If you have the query in URL form, you can use URL.getQuery(), and then would have to split the string at = and & to find the right element, like this:
public String getQueryPart(URL url, String key) {
String query = url.getQuery();
if(query == null)
return null;
String[] parts = query.split("[&=]");
for(int i = 0; i < parts.length; i+=2) {
if(parts[i].equals(key)) {
return parts[i+1];
}
}
}
If you want to query multiple parameters, better store the split String once in a map and query this multiple times.
And of course, if you are using this in a servlet or similar server-side code called by this exactly URL, there are better ways to get the parameters in the servlet API (like Deepak wrote).
2 Comments
ahvargas
I think this is not the best way to do this since already the servlet api has a clean way from doing this. I suggest use the answer of @Deepak
Paŭlo Ebermann
The question did not really say he wants to do this in the code called by this URL - of course, if it is so, better use Deepaks answer.
Depends on you context.
From where are you trying to get this param? How are you using Solr exactly?
BTW, /select is simply a part of a URL used to map requests to the main Solr servlet called (wait for it...) SolrServlet - org.apache.solr.servlet.SolrServlet (deprecated from v4, now solr.StandardRequestHandler is used), which is, due to the fact that it handles search requests, also sometimes referred to as Solr Server.
/selectpart of the URL? Servlet? JSP? Filter?