Answer Happy

// ###################################
// ###### BEGIN: YOUR CODE HERE ###### is where you code
package com.grossmont.ws;

// Classes for reading web service.
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.URL;

// Classes for JSON conversion to java objects using Google's gson.
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.Reader;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;


public class WeatherServiceManager{

private Weather m_oWeather = null;

private String m_sWeatherJson;



// Gets the overall weather JSON string from the 3rd party web service.
public void callWeatherWebService(String sCity){

String sServiceReturnJson = "";

try {

// Call weather API.
URL url = new URL("http://api.openweathermap.org/data/2.5/weather?q=" +
sCity + "&appid=1868f2463a960613c0a78b66a99b5e5f&units=imperial");
BufferedReader br = new BufferedReader(new InputStreamReader(url.openStream()));
String strTemp = "";
while (null != (strTemp = br.readLine())) {
sServiceReturnJson += strTemp;
}

// sServiceReturnJson now looks something like this:
/*
{"coord":{"lon":-116.96,"lat":32.79},
"weather":[{"id":802,"main":"Clouds","description":"scattered clouds","icon":"03n"}],
"base":"cmc stations",
"main":{"temp":62.65,"pressure":1007.4,"humidity":93,"temp_min":62.65,"temp_max":62.65,"sea_level":1028.19,"grnd_level":1007.4},
"wind":{"speed":7.29,"deg":310.501},"clouds":{"all":32},"dt":1463026609,
"sys":{"message":0.0078,"country":"US","sunrise":1463057430,"sunset":1463107097},
"id":5345529,"name":"El Cajon","cod":200}
*/

// *****************
// UNCOMMENT THIS if you wish to print out raw json that came back from web service during testing.
// System.out.println("Returned json:");
// System.out.println(sServiceReturnJson);
// *****************


} catch (Exception ex) {
ex.printStackTrace();
System.out.println("An error occurred in callWeatherWebService() in WeatherServiceManager: " + ex.toString());
}

m_sWeatherJson = sServiceReturnJson;

// Turn raw json into java object heirarchy using Google's gson.
convertJsonToJavaObject();
}




// Uses Google's gson library to convert json into filled java objects
// using the java object heirarchy that you already created.
private void convertJsonToJavaObject(){

Gson gson = new GsonBuilder().create();

m_oWeather = gson.fromJson(m_sWeatherJson, Weather.class);
}




// This uses Google's gson library for parsing json.
public float getCurrentTemp(){

return m_oWeather.main.temp;
}




// ###################################
// ###### BEGIN: YOUR CODE HERE ######
//
// Add three methods... (Use getCurrentTemp as a template):
//
// getCityName
// - input: nothing.
// - output: return the city name as a String (this is in m_oWeather.name).
//
// getHighTemp
// - input: nothing.
// - output: return the high temp as a float.
//
// getLowTemp
// - input: nothing.
// - output: return the low temp as a float.
//
// ###### END: YOUR CODE HERE ######
// #################################




// If you are running this in Tomcat, then this main method
// can be used when developing if you want to test the functions directly
// in your IDE to make sure these classes work first before calling from JSP...
// which is quicker than restarting Tomcat every time
// you make an adjustment to your class.
// Also, it's handy to use the System.out.println tool to print out values
// to the console when testing or use break points and run in debug mode.
public static void main(String[] args){

// If you are NOT incorporating these classes into Tomcat, then do the following for the lab:

// ###### BEGIN: YOUR CODE HERE ######
// 1. Instantiate two instances of this class: WeatherServiceManager
// - Each object will represent each city.
// 2. Get user input two different times to get 2 cities.
// 3. IMPORTANT: Take any space in the city of user input with %20 (e.g. "san diego, california" becomes "san%20diego,california").
// - To do this, simply use the replaceAll method on your city string like this:
sCity1 = sCity1.replaceAll(" ","%20");
// 3. Call callWeatherWebService on each WeatherServiceManager instance passing in each city.
// 4. Then make comparisons of temps between cities on each WeatherServiceManager instance by using the get methods created above:
// - Print out which city has the HIGHEST CURRENT TEMP (NOTE: you can get city name from your m_oWeather.
// - Print out which city has the GREATEST RANGE between low and high.
// ###### END: YOUR CODE HERE ######
}




// ------------------------------------------------------------------------------------------------------------

// ***********************************
// *** BEGIN: NOT PART OF THIS LAB ***
// Only included here just as an example of how the raw json
// could be parsed directly w/o using 3rd party library like gson.
public float getTempManualParse(){

String sTemp = "";
float fTemp;

// Parse "temp" out of JSON reply.
int iTempIndex = m_sWeatherJson.indexOf("\"temp\":") + 7;
sTemp = m_sWeatherJson.substring(iTempIndex);
sTemp = sTemp.substring(0, sTemp.indexOf(","));
fTemp = Float.parseFloat(sTemp);

return fTemp;
}
// *** END: NOT part of lab ***

}