Jackson JSON: get node name from json-tree

Question

How can I receive the node names from a JSON tree using Jackson? The JSON-File looks something like this:

{  
    node         


        

Answer 1

Clarification Here:

While this will work:

 JsonNode rootNode = objectMapper.readTree(file);
 Iterator> fields = rootNode.fields();
 while (fields.hasNext()) {
    Map.Entry entry = fields.next();
    log.info(entry.getKey() + ":" + entry.getValue())
 }

This will not:

JsonNode rootNode = objectMapper.readTree(file);

while (rootNode.fields().hasNext()) {
    Map.Entry entry = rootNode.fields().next();
    log.info(entry.getKey() + ":" + entry.getValue())
}

So be careful to declare the Iterator as a variable and use that.

Be sure to use the fasterxml library rather than codehaus.