How to Efficiently Convert JSON to a Java Map?

Converting JSON to Maps in Java

Problem Statement:

Tasked with converting a given JSON structure into a Java Map where the keys are tuples of fields and the values are corresponding tuple of values, the question arises: Which approach should be adopted? Should a third-party library like Json-lib be utilized, or should a custom parser be developed?

Resolution:

It's generally inadvisable to create your own parser for such a straightforward mapping. Instead, leveraging existing libraries from http://json.org's Java section is recommended.

Implementation with Jackson:

Jackson, available at https://github.com/FasterXML/jackson-databind/#5-minute-tutorial-streaming-parser-generator, provides an efficient solution:

Map<String,Object> result = new ObjectMapper().readValue(JSON_SOURCE, HashMap.class);

where JSON_SOURCE can represent a File, input stream, reader, or a String containing the JSON content.

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