How do I convert an object to JSON representation

Question

Oddly enough, I didn't find this.

What's the simplest way to convert an object to a JSON string? (Edge cases like loops in the object graphs aren't of much interest to me. Let's find a solution to the simple case of class A that contains some objects of classes B,C,D and some primitives).

Basic collection support is a must.

ripper234 · Answer 1 · 2010-11-10T15:05:57.143

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Heh, I discovered/remembered what we are already using for this.

ObjectMapper from CodeHaus

The code looks like this - super simple:

Object obj = ...
String result = new ObjectMapper().writeValueAsString(obj);

edited Nov 10 '10 at 15:05

answered Nov 10 '10 at 14:35

ripper234

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That works. One suggestion: if you do this in many places, make sure to reuse ObjectMapper instances... they are expensive to create. – StaxMan Nov 10 '10 at 19:29
@StaxMan - indeed, I was just demoing a simple usage. Now, I have to wonder if reusing is thread safe. – ripper234 Nov 10 '10 at 21:56
Yes, figured that's the case; but just in case someone wanted to cut'n paste code. And yes, reuse is safe, as per: http://wiki.fasterxml.com/JacksonBestPracticeThreadSafety – StaxMan Nov 11 '10 at 04:06

score 2 · Answer 2 · answered Nov 10 '10 at 14:31

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Gson from google is good for me . It works with collections and generics and converts both ways.

answered Nov 10 '10 at 14:31

NimChimpsky

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score 2 · Answer 3 · edited May 23 '17 at 12:31

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I'd recommend JAXB + Jackson. Look at this question for more details.

edited May 23 '17 at 12:31

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answered Nov 10 '10 at 14:35

willcodejavaforfood

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score 2 · Answer 4 · edited May 23 '17 at 11:58

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See answer here: Javascript to Java using JSON

The answer applies both ways, they're bi-directional.

edited May 23 '17 at 11:58

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answered Nov 10 '10 at 14:36

haylem

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How do I convert an object to JSON representation

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