How to use Jackson to search for values in a JSON file in Java?

com.fasterxml.jackson.databind.node.ObjectNodeThe class can be used to map JSON content to a JSON object structure. We can useObjectNode　Classget()The method searches for a specific value in the JSON file, used to access the value of the specified field in the object node.

Syntax

public JsonNode get(String fieldName)

Example

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ObjectNode;
public class ObjectNodeTest {
　　　public static void main(String args[]) throws Exception {
　　　　　　String jsonString = "{\"Id\":101, "name": "Raja Ramesh", "address": "Madhapur"
　　　　　　ObjectMapper mapper = new ObjectMapper();
　　　　　　ObjectNode node = mapper.readValue(jsonString, ObjectNode.class);
　　　　　　if(node.has("name")) {
　　　　　　　　　System.out.println("NAME: "　+　node.get("name"));
　　　　　　}
　　　}
}

Output Result

NAME: "Raja Ramesh"