Question

I have a Map with my data and want to build a query string with it, just like I would with http_build_query on PHP. I’m not sure if this code is the best implementation of it or if I’m forgetting something?

public String toQueryString(Map<?, ?> data) throws UnsupportedEncodingException {     StringBuffer queryString = new StringBuffer();      for (Entry<?, ?> pair : data.entrySet()) {         queryString.append ( URLEncoder.encode ( (String) pair.getKey (), 'UTF-8' ) + '=' );         queryString.append ( URLEncoder.encode ( (String) pair.getValue (), 'UTF-8' ) + '&' );     }      if (queryString.length () > 0) {         queryString.deleteCharAt ( queryString.length () - 1 );     }      return queryString.toString (); } 

Answer 1

look at the QueryStringBuilder class and its test class :

private String httpBuildQuery(Map<String, String> data)         throws UnsupportedEncodingException {     QueryStringBuilder builder = new QueryStringBuilder();     for (Entry<String, String> pair : data.entrySet()) {         builder.addQueryParameter(pair.getKey(), pair.getValue());     }     return builder.encode('UTF-8'); }