import com.fasterxml.jackson.databind.JsonNode;

import com.fasterxml.jackson.databind.ObjectMapper;

public class JsonReadToString {

public static void main(String[] args) throws Exception {

String json = "{"

+ "\"created_at\":\"Thu Apr 06 15:24:15 +0000 2017\", "

+ "\"id\": 850006245121695744, "

+ "\"text\": \"ツイート\""

+ "}";

ObjectMapper mapper = new ObjectMapper();

JsonNode node = mapper.readTree(json);

System.out.println(node.get("id").longValue()); // → 850006245121695744

System.out.println(node.get("text").textValue()); // → "ツイート"

System.out.println(node.get("created_at").textValue()); // → "Thu Apr 06 15:24:15 +0000 2017"

}

}