Tutorial on using Jackson to realize the mutual conversion between Java objects and JSON

1、 There is an objectmapper class in Jackson, which is very practical for the exchange of Java objects and JSON. 1. Java object to JSON [JSON serialization]

2. JSON to Java class [JSON deserialization]

2、 Jackson supports three usage modes: 1. Data binding: the most convenient (1)Full Data Binding：

Model class:

(2)Raw Data Binding：

(3)generic Data Binding：

2. Tree model: the most flexible.

3. Streaming API: best performance. For programs with high performance requirements, it is recommended to use the stream API. Otherwise, other methods, whether creating a jsongenerator or jsonparser, use jsonfactory.