Is there a right way to build a URL?

You can also use spring UriComponentsBuilder

UriComponentsBuilder
    .fromUriString(baseUrl)
    .queryParam("name", name)
    .queryParam("surname", surname)
    .build().toUriString();

You can use Apache URIBuilder

Sample code: Full Apache Example

URIBuilder builder = new URIBuilder()
    .setScheme("http")
    .setHost("apache.org")
    .setPath("/shindig")
    .addParameter("helloWorld", "foo&bar")
    .setFragment("foo");
builder.toString();

Output: http://apache.org/shindig?helloWorld=foo%26bar#foo