how to read file in java jacakson
try {
// create object mapper instance
ObjectMapper mapper = new ObjectMapper();
// convert JSON file to map
Map<?, ?> map = mapper.readValue(Paths.get("book.json").toFile(), Map.class);
// print map entries
for (Map.Entry<?, ?> entry : map.entrySet()) {
System.out.println(entry.getKey() + "=" + entry.getValue());
}
} catch (Exception ex) {
ex.printStackTrace();
}convert json to object jackson
ObjectMapper objectMapper = new ObjectMapper();
String carJson =
"{ \"brand\" : \"Mercedes\", \"doors\" : 5 }";
try {
Car car = objectMapper.readValue(carJson, Car.class);
System.out.println("car brand = " + car.getBrand());
System.out.println("car doors = " + car.getDoors());
} catch (IOException e) {
e.printStackTrace();
}Copyright © 2021 Codeinu
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