JsonPath: Hello World Application

Let's extract organization names, employee firstName, lastName and salary from below json document.

{
 "org": [{
  "name": "Honeywell",
  "yrsOfExperience": 2.2
 }, {
  "name": "IBM",
  "yrsOfExperience": 1.8
 }],

 "empName": {
  "firstName": "Krishna",
  "lastName": "Rama"
 },

 "salary": 80000.0
}

"$.empName.firstName": Extract firstName from the document.

"$.empName.lastName": Extract lastNam from the document.

"$.org[0].name": Extract first organisation name

"$.org[1].name": Extract second organisation name

"$" represents root element.

Example

String firstOrganization = JsonPath.read(json, "$.org[0].name");

String secondOrganization = JsonPath.read(json, "$.org[1].name");

String firstName = JsonPath.read(json, "$.empName.firstName");

String lastName = JsonPath.read(json, "$.empName.lastName");

double salary = JsonPath.read(json, "$.salary");

App.java

package com.sample.app;

import com.jayway.jsonpath.JsonPath;

public class App {

 public static void main(String[] args) {

  String json = "{\n" + 
    " \"org\": [{\n" + 
    "  \"name\": \"Honeywell\",\n" + 
    "  \"yrsOfExperience\": 2.2\n" + 
    " }, {\n" + 
    "  \"name\": \"IBM\",\n" + 
    "  \"yrsOfExperience\": 1.8\n" + 
    " }],\n" + 
    "\n" + 
    " \"empName\": {\n" + 
    "  \"firstName\": \"Krishna\",\n" + 
    "  \"lastName\": \"Rama\"\n" + 
    " },\n" + 
    "\n" + 
    " \"salary\": 80000.0\n" + 
    "}";

  String firstOrganization = JsonPath.read(json, "$.org[0].name");
  String secondOrganization = JsonPath.read(json, "$.org[1].name");
  String firstName = JsonPath.read(json, "$.empName.firstName");
  String lastName = JsonPath.read(json, "$.empName.lastName");
  double salary = JsonPath.read(json, "$.salary");

  System.out.println("firstOrganization : " + firstOrganization);
  System.out.println("secondOrganization : " + secondOrganization);
  System.out.println("firstName : " + firstName);
  System.out.println("lastName : " + lastName);
  System.out.println("salary : " + salary);


 }

}

Output

firstOrganization : Honeywell
secondOrganization : IBM
firstName : Krishna
lastName : Rama
salary : 80000.0

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