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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