Jackson – Streaming Model examples
This Jackson tutorial show you how to use JsonGenerator to write JSON string and JSON array into a file, furthermore, read it with JsonParser. Jackson Streaming APIs: JsonGenerator – Write…
Gson – How to parse JSON
Gson provide simple toJson() and fromJson() methods to convert Java objects to / from JSON. The toJson() – Java object to JSON and fromJson() – JSON to Java object
Jackson – Tree Model examples
In Jackson, we can use Tree Model to represent the JSON structure, and perform the CRUD operations via JsonNode, similar to the XML DOM tree. This Jackson Tree Model is…
Jackson – Convert JSON string to Map
In Jackson, we can use mapper.readValue(json, Map.class) to convert a JSON string to a Map
Jackson – Convert JSON array string to List
Few Jackson examples to convert a JSON array string to a List.
Jackson @JsonView examples
In Jackson, we can use @JsonView to limit or control fields display for different users. Puts @JsonView on field level to limit fields display for different views. Below example, show…
Jackson – How to ignore null fields
In Jackson, we can use @JsonInclude(JsonInclude.Include.NON_NULL) to ignore the null fields. To ignore the null fields, put @JsonInclude on class level or field level. Alternatively, we also can configure to…
Java 8 – MinguoDate examples
This MinguoDate calendar system is primarily used in Taiwan (Republic of China…). To convert the current date to the Minguo date, just subtracts the current year with number 1911
How to calculate elapsed / execute time in Java
In Java, you can use the following ways to measure elapsed time in Java: System.nanoTime() - This is the recommended solution to measure elapsed time in Java. We also can…
Java – How to change date format in a String
If Java 8, DateTimeFormatter, else SimpleDateFormat to change the date format in a String. Convert the String to LocalDateTime and change the date format with DateTimeFormatter. Convert the String to…