How to convert map to url query string?

Question

Do you know of any utility class/library, that can convert Map into URL-friendly query string?

Example:

I have a map:

\"param1\"=12,
\"param2         


        

Answer 1

Personally, I'd go for a solution like this, it's incredibly similar to the solution provided by @rzwitserloot, only subtle differences.

This solution is small, simple & clean, it requires very little in terms of dependencies, all of which are a part of the Java Util package.

Map map = new HashMap<>();

map.put("param1", "12");
map.put("param2", "cat");

String output = "someUrl?";
output += map.entrySet()
    .stream()
    .map(x -> x.getKey() + "=" + x.getValue() + "&")
    .collect(Collectors.joining("&"));

System.out.println(output.substring(0, output.length() -1));