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Jackson is very popular and efficient java based library to serialize and map java based object to json and vice versa.jackson is quiet fast and is of low memory footprint and is suitable for large object graphs or systems.
Note – Turns out that on Android GSON is faster for small Json strings. This is because Jackson has a longer initialization time. With larger Json strings the longer initialization time is made up by the faster proccessing time. But for shorter Json strings GSON is faster because it initializes faster.
jackson ObjectMapper is simplest way to parse json with jackson.ObjectMapper is the main class of jackson library
Read object from json String
Jackson contains a set of Java annotations which you can use to modify how Jackson reads and writes JSON to and from Java objects.
Properties should only be included if they are non-null, non-empty, or have non-default values. Here is an example that shows how you can use the @JsonInclude annotation:
The @JsonProperty annotation is used to map property names with JSON keys during serialization and deserialization. By default, if you try to serialize a POJO, the generated JSON will have keys mapped to the fields of the POJO. If you want to override this behavior, you can use the @JsonProperty annotation on the fields. It takes a String attribute that specifies the name that should be mapped to the field during serialization.
Read object from json File
Read object from json by url
write object to json
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