Parse a URI String into Name-Value Collection

Question

I\'ve got the URI like this:

https://google.com.ua/oauth/authorize?client_id=SS&response_type=code&scope=N_FULL&access_type=offline&redirect_         


        

Answer 1

Netty also provides a nice query string parser called QueryStringDecoder. In one line of code, it can parse the URL in the question. I like because it doesn't require catching or throwing java.net.MalformedURLException.

In one line:

Map> parameters = new QueryStringDecoder(url).parameters();

See javadocs here: https://netty.io/4.1/api/io/netty/handler/codec/http/QueryStringDecoder.html

Here is a short, self contained, correct example:

import io.netty.handler.codec.http.QueryStringDecoder;
import org.apache.commons.lang3.StringUtils;

import java.util.List;
import java.util.Map;

public class UrlParse {

  public static void main(String... args) {
    String url = "https://google.com.ua/oauth/authorize?client_id=SS&response_type=code&scope=N_FULL&access_type=offline&redirect_uri=http://localhost/Callback";
    QueryStringDecoder decoder = new QueryStringDecoder(url);
    Map> parameters = decoder.parameters();
    print(parameters);
  }

  private static void print(final Map> parameters) {
    System.out.println("NAME               VALUE");
    System.out.println("------------------------");
    parameters.forEach((key, values) ->
        values.forEach(val ->
            System.out.println(StringUtils.rightPad(key, 19) + val)));
  }
}

which generates

NAME               VALUE
------------------------
client_id          SS
response_type      code
scope              N_FULL
access_type        offline
redirect_uri       http://localhost/Callback