Get Time Zone by Providing Latitude and Longitude using Spring MVC and REST API

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
import org.springframework.web.servlet.view.JstlView;

@Configuration
@EnableWebMvc
@ComponentScan(basePackages = { "com.wtia.WTIA_Rest_API" })
public class AppConfig {
    @Bean
    public InternalResourceViewResolver resolver() {
        InternalResourceViewResolver resolver = new InternalResourceViewResolver();
        resolver.setViewClass(JstlView.class);
        resolver.setPrefix("/");
        resolver.setSuffix(".jsp");
        return resolver;
    }
}

import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;

public class SpringMvcDispatcherServletInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {
 
    @Override
    protected Class<?>[] getRootConfigClasses() {
        return null;
    }
 
    @Override
    protected Class<?>[] getServletConfigClasses() {
        return new Class[] { AppConfig.class };
    }
 
    @Override
    protected String[] getServletMappings() {
        return new String[] { "/" };
    }
 
}

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import com.google.gson.Gson;
import com.google.gson.JsonObject;

@Controller
public class WtiaController {

    @RequestMapping("/getSateliteDetailsByLatAndLon")
    public @ResponseBody
    JsonObject getSateliteDetails(String  latitude,String longitude ) throws IOException {
        JsonObject jsonObject = new JsonObject();
        String timezoneId = getSateliteData(latitude,longitude);
        timezoneId = timezoneId.replaceAll("^\"|\"$", "");
        jsonObject.addProperty("timezone_id", timezoneId);
        return jsonObject;
    }

    private String getSateliteData(String latitude,String longitude) throws IOException {
        String data = null;
        StringBuilder responseData = new StringBuilder();
        JsonObject jsonObject = null;
        URL url = null;      
        url = new URL("https://api.wheretheiss.at/v1/coordinates/"+latitude + "," + longitude);
        HttpURLConnection con = (HttpURLConnection) url.openConnection();
        con.setRequestMethod("GET");
        con.setRequestProperty("User-Agent", "Mozilla/5.0");
        int responseCode = con.getResponseCode();
        System.out.println("\nSending 'GET' request to URL : " + url);
        System.out.println("Response Code : " + responseCode);
        try (BufferedReader in = new BufferedReader(
                new InputStreamReader(con.getInputStream()))) {
            String line;
            while ((line = in.readLine()) != null) {
                responseData.append(line);
            }
            jsonObject = new Gson().fromJson(responseData.toString(), JsonObject.class);          
            data = jsonObject.get("timezone_id").toString();
        }
        System.out.println(data);
        return data;
    }
}

package com.wtia.WTIA_Rest_API.controller;

import com.google.gson.Gson;
import com.google.gson.JsonObject;
import org.junit.Before;
import org.junit.Test;
import org.springframework.test.web.servlet.MockMvc;
import org.springframework.test.web.servlet.MvcResult;
import org.springframework.test.web.servlet.setup.MockMvcBuilders;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import static org.junit.Assert.assertEquals;
import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;

public class WtiaControllerTest {
    
    // It is available in
    // org.springframework.test.web.servlet.MockMvc
    private MockMvc mockMvc;

    @Before
    public void setup() {
        this.mockMvc = MockMvcBuilders.standaloneSetup(new WtiaController()).build();
    }

    @Test
    public void testWTIADetails() throws Exception {
        
        // expected
        String expectedTimezoneId = null;
        StringBuilder responseData = new StringBuilder();
        JsonObject expectedJsonObject = null;
        URL url = new URL("https://api.wheretheiss.at/v1/coordinates/50.11496269845,118.07900427317");
        HttpURLConnection con = (HttpURLConnection) url.openConnection();
        con.setRequestMethod("GET");
        con.setRequestProperty("User-Agent", "Mozilla/5.0");
        try (BufferedReader in = new BufferedReader(
                new InputStreamReader(con.getInputStream()))) {

            String line;

            while ((line = in.readLine()) != null) {
                responseData.append(line);
            }

            expectedJsonObject = new Gson().fromJson(responseData.toString(), JsonObject.class);
            expectedTimezoneId = expectedJsonObject.get("timezone_id").toString();
            expectedTimezoneId = expectedTimezoneId.replaceAll("^\"|\"$", "");

        }

        // actual
        MvcResult result = mockMvc.perform(get("/getSateliteDetailsByLatAndLon?latitude=50.11496269845&longitude=118.07900427317"))
                .andReturn();
        String receivedResponse = result.getResponse().getContentAsString();
        JsonObject actualJsonObject = new Gson().fromJson(receivedResponse, JsonObject.class);
        String actualTimezoneId = actualJsonObject.get("timezone_id").toString();
        actualTimezoneId = actualTimezoneId.replaceAll("^\"|\"$", "");
        
        // checking the expectedtimezone and actualtimezone
        assertEquals(expectedTimezoneId, actualTimezoneId);
    }
}