jsp - Removing Client Response Url parameter -


question. when having client url following parameters contactvia=email&interestedin=petrock&terms=on how can 1 remove (present) attribute terms=on when call reaches servlet?

so response url becomes contactvia=email&interestedin=petrock

context. values in textboxes calling form automatically added response url, have tried remove terms request.removeattribute(); , editing request.getparametermap();.

but removeattribute has no effect , map immutable. suggestions?

this kind of scenario 1 of reasons javax.servlet.http.httpservletrequestwrapper exists. can subclass , override behaviour.

a javax.servlet.filter place this:

@webfilter(urlpatterns = "/same/as/your/servlet") public class parameterfilter implements filter {      /*      * treat guide - it's not tested in way      */     @override     public void dofilter(servletrequest request, servletresponse response, filterchain chain) throws ioexception, servletexception {         if (request instanceof httpservletrequest) {             final httpservletrequestwrapper wrappedrequest = new httpservletrequestwrapper((httpservletrequest)                     request) {                  @override                 public map<string, string[]> getparametermap() {                     return request.getparametermap()                             .entryset()                             .stream()                             .filter(mapentry -> !mapentry.getkey().equals("terms"))                             .collect(collectors.tomap(mapentry -> mapentry.getkey(), mapentry -> mapentry.getvalue()));                 }                  @override                 public enumeration<string> getparameternames() {                     return new vector(request.getparametermap()                             .keyset()                             .stream()                             .filter(key -> !key.equals("terms"))                             .collect(collectors.tolist())).elements();                 }                  @override                 public string getparameter(string name) {                     return name.equals("terms") ? null : super.getparameter(name);                 }                  @override                 public string[] getparametervalues(string name) {                     return name.equals("terms") ? null : super.getparametervalues(name);                 }                  @override                 public string getquerystring() {                     final string[] querytuples = super.getquerystring().split("&");                     return string.join("&",                                         arrays.stream(querytuples)                                             .filter(pv -> !pv.matches("terms=?"))                                             .collect(collectors.tolist()).toarray(new string[querytuples.length]));                 }             };              chain.dofilter(wrappedrequest, response);         } else {             chain.dofilter(request, response);         }     }      @override     public void init(filterconfig filterconfig) throws servletexception {     }      @override     public void destroy() {     } }

you can make more or less elaborate depending upon needs.


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