How deserialize JSON object from HttpResponse using Jackson annotations?

Question

I'm using the Apache http classes to call a web service that returns a JSON object in the response body. I have a Jackson annotated java class mapped to the JSON object. I want to do something this, but google hasn't turned up the correct boilerplate.

    String url = hostName + uri;
    HttpGet httpGet = new HttpGet(url);
    HttpResponse response = httpclient.execute(httpGet);
    MyObject myObject = (MyObject)response.getEntity().getContent();

Reading the documentation helps: http://wiki.fasterxml.com/JacksonInFiveMinutes. — JB Nizet, Aug 04 '11 at 22:27
is this HttpGet and HttpResponse is asynchronous call or not? :D — gumuruh, Mar 30 '12 at 09:40

score 77 · Accepted Answer · edited Jan 01 '15 at 00:14

77

You have to use the ObjectMapper:

MyObject myObject = objectMapper.readValue(response.getEntity().getContent(), MyObject.class);

(An object mapper instance can be reused, so no need to create a new one for each deserialization)

edited Jan 01 '15 at 00:14

Eric

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answered Aug 04 '11 at 22:27

Bozho

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All Jackson methods have form 'readValue(source, type)', so it kind of follows pattern. And when using IDE, auto-completion helps a lot showing possibilities (if not, need to check javadocs) – StaxMan Aug 05 '11 at 23:29
Getting "Non-static method 'readValue(java.io.InputStream, java.lang.Class)' cannot be referenced from a static context" – Collin Jan 19 '23 at 17:05
Wow I'm a noob I just had to do `ObjectMapper objectMapper = new ObjectMapper();` first – Collin Jan 19 '23 at 17:08

How deserialize JSON object from HttpResponse using Jackson annotations?

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