Based on https://github.com/spring-projects/spring-framework/commit/d1aee0e8691c41753621332ff69b17be3f7c8ba2 from Oct 6th.
spring-web has many good utils but is too big and drags in many other dependencies...
To encode your URL, and particularly your query parameters, you just need a small method from UriComponentsBuilder. Extracted now in SpringUtil.
How to use:
String base = "http://example.com/query";
Map<String, String> param = new TreeMap<>();
param.put("msg", "hello world");
param.put("id", "&<>");
String query = param.entrySet().stream()
.map((e) -> e.getKey() + "=" + SpringUtil.encodeUriComponent(e.getValue(), StandardCharsets.UTF_8, SpringUtil.Type.QUERY_PARAM))
.collect(Collectors.joining("&"));
String url = base + "?" + query;
Assert.assertEquals("http://example.com/query?id=%26%3C%3E&msg=hello%20world", url);
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