Java Define Json Object

In this article we use the objectmapper class of jackson library to convert json to java object with an example.

Java define json object. Javascript object notation json is a standard text based format for representing structured data based on javascript object syntax. On decoding the default concrete class of java util list is org json simple jsonarray and the default concrete class of java util map is org json simple jsonobject. The json format is syntactically identical to the code for creating javascript objects.

It s both easy to read write and language independent. Keys must be strings and values must be a valid json data type string number object array boolean or null. Use filereader to read json file and pass it to parser.

It is a very common data format with a diverse range of applications such. Json can represent two structured types. Encoding json in java.

First of all we will create jsonparser instance to parse json file. Following is a simple example to encode a json object using java jsonobject which is a subclass of java util hashmap. Before getting started let s define the required jackson api dependencies.

An array is an ordered sequence of zero or more values. Json objects are surrounded by curly braces. An object is an unordered collection of zero or more name value pairs.

To read json from file we will be using the json file we created in the previous example. Let s first add the following dependencies to the pom xml. Json javascript object notation is a lightweight text based language independent data exchange format that is easy for humans and machines to read and write.