JSON

Jackson

import org.codehaus.jackson.JsonParseException;
import org.codehaus.jackson.map.JsonMappingException;
import org.codehaus.jackson.map.ObjectMapper;


ObjectMapper objectMapper = new ObjectMapper();
Car car = new Car();
car.brand = "BMW";
car.doors = 4;
String json = objectMapper.writeValueAsString(car);
System.out.println(json)

      String json = "{\n" +

                "    \"name\": \"Garima\",\n" +

                "    \"surname\": \"Joshi\",\n" +

                "    \"phone\": 9832734651}";

 User garima = new ObjectMapper().readValue(json, User.class);

jackson-xc-1.9.11.jar

jackson-core-asl-1.9.11.jar

jackson-mapper-asl-1.9.11.jar

String carJson =        "{ \"brand\" : \"Mercedes\", \"doors\" : 5 }";

ObjectMapper objectMapper = new ObjectMapper();

 JsonNode node = objectMapper.readValue(carJson, JsonNode.class);

ObjectMapper objectMapper = new ObjectMapper();

File file = new File("data/car.json");

Car car = objectMapper.readValue(file, Car.class);

ObjectMapper objectMapper = new ObjectMapper();

URL url = new URL("file:data/car.json");

Car car = objectMapper.readValue(url, Car.class);

ObjectMapper objectMapper = new ObjectMapper();

InputStream input = new FileInputStream("data/car.json");

Car car = objectMapper.readValue(input, Car.class);

String carJson =

        "{ \"brand\" : \"Mercedes\", \"doors\" : 5," +

        "  \"owners\" : [\"John\", \"Jack\", \"Jill\"]," +

        "  \"nestedObject\" : { \"field\" : \"value\" } }";

ObjectMapper objectMapper = new ObjectMapper();

try {

    JsonNode node = objectMapper.readValue(carJson, JsonNode.class);

    JsonNode brandNode = node.get("brand");

    String brand = brandNode.asText();

    System.out.println("brand = " + brand);

    JsonNode doorsNode = node.get("doors");

    int doors = doorsNode.asInt();

    System.out.println("doors = " + doors);

    JsonNode array = node.get("owners");

    JsonNode jsonNode = array.get(0);

    String john = jsonNode.asText();

    System.out.println("john  = " + john);

    JsonNode child = node.get("nestedObject");

    JsonNode childField = child.get("field");

    String field = childField.asText();

    System.out.println("field = " + field);

} catch (IOException e) {

    e.printStackTrace();

}

GSON