Java JSON Tutorial

JSON (JavaScript Object Notation), is a simple and easy to read and write data exchange format. It’s popular and implemented in countless projects worldwide, for those don’t like XML, JSON is a very good alternative solution.

In this series of Java JSON tutorials, we focus on three popular third party Java libraries to process JSON data, which are Jackson, Google Gson and JSON.simple

Jackson

A High-performance JSON processor.

• Jackson data binding example – Object & JSON
  Example to use ObjectMapper writeValue() and readValue() to convert Java object to / from JSON.
• Jackson data binding example – Map & JSON
  Example to convert Java Map to / from JSON
• Jackson Tree Model example
  Read JSON into Tree, like DOM for XML.
• Jackson Streaming example
  Example to use JsonGenerator() and JsonParser() to stream read and write JSON data.
• Pretty print JSON output in Jackson
  Pretty print JSON output via defaultPrettyPrintingWriter().

Google Gson

It was originally created for use inside Google, now it is used by many public projects.

• Gson data model example – Object & JSON
  Example to use toJson() and fromJson() to convert Java Object to / from JSON.
• Gson Streaming example
  Example to use JsonWriter() and JsonReader () to stream read and write JSON data.
• Pretty print JSON output in Gson
  Pretty print JSON output via GsonBuilder.

JSON.simple

Simple Java library for JSON, to read and write JSON data.

• JSON.simple example – Read and write JSON
  Example to show you how to read and write JSON data to / from file.

References

1. Introducing JSON
2. JSON described in RFC 4627
3. JSON Wiki
4. Jackson official website
5. Gson official website
6. JSON.simple official website
7. Review of 5 Java JSON libraries
8. Jackson vs Gson

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