java properties to json

Question

Is there an easy way to convert properties with dot notation to json

I.E

server.host=foo.bar
server.port=1234

TO

{
         


        

Answer 1

I didn't want any dependency on gson and I wanted to return a hierarchical json from a Spring controller so a deep Map was enough for me.

This works for me, just loop over all your keys and pass in an empty map.

void recurseCreateMaps(Map currentMap, String key, String value) {
    if (key.contains(".")) {
        String currentKey = key.split("\\.")[0];

        Map deeperMap;

        if (currentMap.get(currentKey) instanceof Map) {
            deeperMap = (Map) currentMap.get(currentKey);
        } else {
            deeperMap = new HashMap<>();
            currentMap.put(currentKey, deeperMap);
        }

        recurseCreateMaps(deeperMap, key.substring(key.indexOf('.') + 1), value);
    } else {
        currentMap.put(key, value);
    }
}