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Write JsonNode to JSONObjectMapper objectMapper = new ObjectMapper(); JsonNode jsonNode = readJsonIntoJsonNode(); String json = objectMapper. writeValueAsString(jsonNode); The readJsonIntoJsonNode() method is just a method I have created which parses a JSON string into a JsonNode - just so we have a JsonNode to write.
JsonNode represents any valid Json structure whereas ObjectNode and ArrayNode are particular implementations for objects (aka maps) and arrays, respectively.
Converting Java object to JSON In it, create an object of the POJO class, set required values to it using the setter methods. Instantiate the ObjectMapper class. Invoke the writeValueAsString() method by passing the above created POJO object. Retrieve and print the obtained JSON.
The simple readValue API of the ObjectMapper is a good entry point. We can use it to parse or deserialize JSON content into a Java object. Also, on the writing side, we can use the writeValue API to serialize any Java object as JSON output.
As of Jackson 1.6, you can use:
JsonNode node = mapper.valueToTree(map);
or
JsonNode node = mapper.convertValue(object, JsonNode.class);
Source: is there a way to serialize pojo's directly to treemodel?
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