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: wiki.fasterxml.com/JacksonInFiveMinutes. — JB Nizet
– JB Nizet, Commented Aug 4, 2011 at 22:27

Eric · Accepted Answer · 2015-01-01 00:14:14Z

79

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 1, 2015 at 0:14

Eric

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answered Aug 4, 2011 at 22:27

Bozho

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3 Comments

StaxMan Over a year ago

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)

Collin Over a year ago

Getting "Non-static method 'readValue(java.io.InputStream, java.lang.Class<T>)' cannot be referenced from a static context"

Collin Over a year ago

Wow I'm a noob I just had to do ObjectMapper objectMapper = new ObjectMapper(); first

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