Convert Java Object into JSON and JSON into Java Object | Jackson API

In this video I have shown how to parse JSON Object to a JAVA Object using JACKSON API.

1. Project Structure,

2. In this project we use 2 jars,
   1. com.fasterxml.jackson.core.jar
   2. com.fasterxml.jackson.databind.jar
   Add these jars to build path of Project
3. For testing we have registered with website http://api.ipinfodb.com. After registering we will get the API Key.This website has a web service which will return JSON response of IP location information for the HTTP request we send.
   Eg: HTTP request

   http://api.ipinfodb.com/v3/ip-city/?key=9d64fcfdfacc213c7ddf4ef911dfe97b55e4696be3532bf8302846c09ebad06b&ip=37.210.57.113&format=json

   Response

4. Create a Bean class with all the parameters of the JSON object

   Country_Bean.java

   
   package com.chillyfacts.com;
    public class Country_Bean {
   	private String statusCode;
   	private String statusMessage;
   	private String ipAddress;
   	private String countryCode;
   	private String countryName;
   	private String regionName;
   	private String cityName;
   	private String zipCode;
   	private String latitude;
   	private String longitude;
   	private String timeZone;
   	public String getStatusCode() {
   		return statusCode;
   	}
   	public void setStatusCode(String statusCode) {
   		this.statusCode = statusCode;
   	}
   	public String getStatusMessage() {
   		return statusMessage;
   	}
   	public void setStatusMessage(String statusMessage) {
   		this.statusMessage = statusMessage;
   	}
   	public String getIpAddress() {
   		return ipAddress;
   	}
   	public void setIpAddress(String ipAddress) {
   		this.ipAddress = ipAddress;
   	}
   	public String getCountryCode() {
   		return countryCode;
   	}
   	public void setCountryCode(String countryCode) {
   		this.countryCode = countryCode;
   	}
   	public String getCountryName() {
   		return countryName;
   	}
   	public void setCountryName(String countryName) {
   		this.countryName = countryName;
   	}
   	public String getRegionName() {
   		return regionName;
   	}
   	public void setRegionName(String regionName) {
   		this.regionName = regionName;
   	}
   	public String getCityName() {
   		return cityName;
   	}
   	public void setCityName(String cityName) {
   		this.cityName = cityName;
   	}
   	public String getZipCode() {
   		return zipCode;
   	}
   	public void setZipCode(String zipCode) {
   		this.zipCode = zipCode;
   	}
   	public String getLatitude() {
   		return latitude;
   	}
   	public void setLatitude(String latitude) {
   		this.latitude = latitude;
   	}
   	public String getLongitude() {
   		return longitude;
   	}
   	public void setLongitude(String longitude) {
   		this.longitude = longitude;
   	}
   	public String getTimeZone() {
   		return timeZone;
   	}
   	public void setTimeZone(String timeZone) {
   		this.timeZone = timeZone;
   	}
   }
   
   

5. JSON_to_JAVA.java

   
   package com.chillyfacts.com;
   import java.io.BufferedReader;
   import java.io.InputStreamReader;
   import java.net.HttpURLConnection;
   import java.net.URL;
   import org.codehaus.jackson.map.ObjectMapper;
   public class JSON_to_JAVA {
       public static void main(String[] args) {
           try {
               JSON_to_JAVA.convert_json_to_java();
           } catch (Exception e) {
               System.out.println(e);
           }
       }
       public static void convert_json_to_java() throws Exception {
           String ip = "37.210.57.113";
           String key = "9d64fcfdfacc213c7ddf4ef911dfe97b55e4696be546x532bf8302876c09ebad06b";
           String url = "http://api.ipinfodb.com/v3/ip-city/?key=" + key + "&ip=" + ip + "&format=json";
           URL obj = new URL(url);
           HttpURLConnection con = (HttpURLConnection) obj.openConnection();
           con.setRequestMethod("GET");
           con.setRequestProperty("User-Agent", "Mozilla/5.0");
           BufferedReader in = new BufferedReader(
               new InputStreamReader(con.getInputStream()));
           String inputLine;
           StringBuffer response = new StringBuffer();
           while ((inputLine = in .readLine()) != null) {
               response.append(inputLine);
           } in .close();
           System.out.println(response.toString());
           ObjectMapper obj_ObjectMapper = new ObjectMapper();
           Country_Bean obj_Country_Bean = new Country_Bean();
           obj_Country_Bean = obj_ObjectMapper.readValue(response.toString(), Country_Bean.class);
           System.out.println("-------Afer converting to java object-------------------");
           System.out.println("statusCode-" + obj_Country_Bean.getStatusCode());
           System.out.println("statusMessage-" + obj_Country_Bean.getStatusMessage());
           System.out.println("ipAddress-" + obj_Country_Bean.getIpAddress());
           System.out.println("countryCode-" + obj_Country_Bean.getCountryCode());
           System.out.println("countryName-" + obj_Country_Bean.getCountryName());
           System.out.println("regionName-" + obj_Country_Bean.getRegionName());
           System.out.println("cityName-" + obj_Country_Bean.getCityName());
           System.out.println("zipCode-" + obj_Country_Bean.getZipCode());
           System.out.println("latitude-" + obj_Country_Bean.getLatitude());
           System.out.println("longitude-" + obj_Country_Bean.getLongitude());
           System.out.println("timeZone-" + obj_Country_Bean.getTimeZone());
       }
   }
   
   

6. Console Output after converting the JSON response to JAVA object

   {	"statusCode" : "OK",	"statusMessage" : "",	"ipAddress" : "37.210.57.113",	"countryCode" : "QA",	"countryName" : "Qatar",	"regionName" : "Ad Dawhah",	"cityName" : "Doha",	"zipCode" : "-",	"latitude" : "25.2793",	"longitude" : "51.5224",	"timeZone" : "+03:00"}
   
   -------Afer converting to java object-------------------
   statusCode-OK
   statusMessage-
   ipAddress-37.210.57.113
   countryCode-QA
   countryName-Qatar
   regionName-Ad Dawhah
   cityName-Doha
   zipCode--
   latitude-25.2793
   longitude-51.5224
   timeZone-+03:00
   

7. JAVA_to_JSON.java

   
   package com.chillyfacts.com;
   import java.io.StringWriter;
   import org.codehaus.jackson.map.ObjectMapper;
   public class JAVA_to_JSON {
       public static void main(String[] args) {
           try {
               Country_Bean obj_Country_Bean = new Country_Bean();
               obj_Country_Bean.setStatusCode("OK");
               obj_Country_Bean.setStatusMessage("jinu Testing JSON");
               obj_Country_Bean.setCountryName("INDIA");
               obj_Country_Bean.setIpAddress("2.2.2.2.2.2");
               obj_Country_Bean.setCountryCode("IN");
               obj_Country_Bean.setRegionName("Kerala");
               obj_Country_Bean.setCityName("Kerala City");
               obj_Country_Bean.setZipCode("9632874");
               obj_Country_Bean.setLatitude("11.3656155");
               obj_Country_Bean.setLongitude("52.3333");
               obj_Country_Bean.setTimeZone("test time zone");
               ObjectMapper objectMapper = new ObjectMapper();
               StringWriter stringEmp = new StringWriter();
               objectMapper.writeValue(stringEmp, obj_Country_Bean);
               System.out.println("Country JSON is\n" + stringEmp);
           } catch (Exception e) {
               System.out.println(e);
           }
       }
   }
   
   

8. Console output after converting Java Object to JSON

   Country JSON is
   {"statusCode":"OK","statusMessage":"jinu Testing JSON","ipAddress":"2.2.2.2.2.2","countryCode":"IN","countryName":"INDIA","regionName":"Kerala","cityName":"Kerala City","zipCode":"9632874","latitude":"11.3656155","longitude":"52.3333","timeZone":"test time zone"}
   
   

9. Download the project Here

   JSON_JAVA.rar