Parse JSON in Java
public class JsonTest {
public static void main(String args[]){
String str = "{ \"name\": \"Alice\", \"age\": 20 }";
JSONObject obj = new JSONObject(str);
String name= obj.getString("name");
int age = obj.getInt("age");
System.out.println("name: "+name);
System.out.println("age: "+age);
}
}
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JSON Array
import org.json.*;
public class JSONArrayTest {
public static void main(String args[]){
String str = "{ \"number\": [3, 4, 5, 6] }";
JSONObject obj = new JSONObject(str);
JSONArray arr=obj.getJSONArray("number");
for(int i=0;i<arr.length();i++){
System.out.print(arr.getInt(i));
}
}
}
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Google Maps API provides geocoding services to find the latitude/longitude of an address. The service returns results in JSON. The following method
geocoding() does the following:- Build a URL to access the geocoding service.
- Read from the URL.
- Build a JSON object for the content.
- Retrieve the first result from an array of results.
- Print out the information.
Geo Coding
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;
import java.util.Scanner;
import org.json.JSONObject;
public class GeoCoding {
public static void main(String args[]) throws IOException{
String addr ="1600+Amphitheatre+Parkway,+Mountain+View,+CA";
String s= "http://maps.googleapis.com/maps/api/geocode/json?address=1600+Amphitheatre+Parkway,+Mountain+View,+CA&sensor=false";
s+=URLEncoder.encode(addr,"UTF-8");
URL url=new URL(s);
// read from the URL
Scanner scan = new Scanner(url.openStream());
String str = new String();
while (scan.hasNext())
str += scan.nextLine();
scan.close();
// build a JSON object
JSONObject obj = new JSONObject(str);
if (! obj.getString("status").equals("OK"))
return;
// get the first result
JSONObject res = obj.getJSONArray("results").getJSONObject(0);
System.out.println(res.getString("formatted_address"));
JSONObject loc =
res.getJSONObject("geometry").getJSONObject("location");
System.out.println("lat: " + loc.getDouble("lat") +
", lng: " + loc.getDouble("lng"));
}
}
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http://mvnrepository.com/artifact/org.json/json/20160810
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https://stackoverflow.com/questions/2591098/how-to-parse-json
http://theoryapp.com/parse-json-in-java/
Geocoding
Google Maps API provides geocoding services to find the latitude/longitude of an address. The service returns results in JSON. The following method
geocoding() does the following:- Build a URL to access the geocoding service.
- Read from the URL.
- Build a JSON object for the content.
- Retrieve the first result from an array of results.
- Print out the information.
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| public static void geocoding(String addr) throws Exception{ // build a URL "sensor=false&address="; s += URLEncoder.encode(addr, "UTF-8"); URL url = new URL(s); // read from the URL Scanner scan = new Scanner(url.openStream()); String str = new String(); while (scan.hasNext()) str += scan.nextLine(); scan.close(); // build a JSON object JSONObject obj = new JSONObject(str); if (! obj.getString("status").equals("OK")) return; // get the first result JSONObject res = obj.getJSONArray("results").getJSONObject(0); System.out.println(res.getString("formatted_address")); JSONObject loc = res.getJSONObject("geometry").getJSONObject("location"); System.out.println("lat: " + loc.getDouble("lat") + ", lng: " + loc.getDouble("lng"));} |
Example:
http://maps.googleapis.com/maps/api/geocode/json?address=1600+Amphitheatre+Parkway,+Mountain+View,+CA&sensor=false
------------------------------------------------
{
"results" : [
{
"address_components" : [
{
"long_name" : "Google Building 42",
"short_name" : "Google Bldg 42",
"types" : [ "premise" ]
},
{
"long_name" : "1600",
"short_name" : "1600",
"types" : [ "street_number" ]
},
{
"long_name" : "Amphitheatre Parkway",
"short_name" : "Amphitheatre Pkwy",
"types" : [ "route" ]
},
{
"long_name" : "Mountain View",
"short_name" : "Mountain View",
"types" : [ "locality", "political" ]
},
{
"long_name" : "Santa Clara County",
"short_name" : "Santa Clara County",
"types" : [ "administrative_area_level_2", "political" ]
},
{
"long_name" : "California",
"short_name" : "CA",
"types" : [ "administrative_area_level_1", "political" ]
},
{
"long_name" : "United States",
"short_name" : "US",
"types" : [ "country", "political" ]
},
{
"long_name" : "94043",
"short_name" : "94043",
"types" : [ "postal_code" ]
}
],
"formatted_address" : "Google Bldg 42, 1600 Amphitheatre Pkwy, Mountain View, CA 94043, USA",
"geometry" : {
"bounds" : {
"northeast" : {
"lat" : 37.42198310000001,
"lng" : -122.0853195
},
"southwest" : {
"lat" : 37.4214139,
"lng" : -122.0860042
}
},
"location" : {
"lat" : 37.4216548,
"lng" : -122.0856374
},
"location_type" : "ROOFTOP",
"viewport" : {
"northeast" : {
"lat" : 37.4230474802915,
"lng" : -122.0843128697085
},
"southwest" : {
"lat" : 37.4203495197085,
"lng" : -122.0870108302915
}
}
},
"place_id" : "ChIJPzxqWQK6j4AR3OFRJ6LMaKo",
"types" : [ "premise" ]
}
],
"status" : "OK"
}
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