Weather Forecaster App in Java Java Applet: JavaFX for the UI and you can set up

Question

Weather Forecaster App in Java

Java Applet: JavaFX for the UI and you can set up the UI using fxml files or pure Java code

Goal: Create an app to display a weather forecast for the user’s current location,

Main Screen-- display the location (City, State), and high and low temperature for the current day

2) Edit screen - update the city and state and save it to the database

Input validation for the zip code (only valid 5 digit zip codes should be accepted)

Display High Temp, Low Temp, Humidity Pressure Sunrise and Sun Set

Display images for the forecast (eg: clouds for cloudy weather, a sun for clear weather)

Database: Store location in database, and allow it to be updated via JDBC  

Some publicly available weather APIs (any API is acceptable):

https://developer.yahoo.com/weather/

Explanation / Answer

package com.weather.app;

//Main Application Class That will accept on zip code as command line argument

import java.io.InputStream;

import com.weather.app.service.Weather;

import com.weather.app.service.YahooParser;

import com.weather.app.service.YahooRetriever;

public class Main {

public static void main(String[] args) throws Exception {

// Read the zip code from the command line

// (if none supplied, use 60202)

System.setProperty("http.agent", "Fake Agent");

String zipcode = "60202";

try {

zipcode = args[0];

} catch( Exception e ) {}

// Start the program

new Main(zipcode).start();

}

private String zip;

public Main(String zip) {

this.zip = zip;

}

public void start() throws Exception {

// Retrieve Data

InputStream dataIn = new YahooRetriever().retrieve( zip );

// Parse Data

Weather weather = new YahooParser().parse( dataIn );

// Format (Print) Data

// System.out.print( new WeatherFormatter().format( weather ) );

}

}

package com.weather.app.service;

// Model Class that will responsible for storing data

public class Weather {

private String city;

private String region;

private String country;

private String condition;

private String temp;

private String chill;

private String humidity;

public Weather() {}

public String getCity() { return city; }

public void setCity(String city) {

this.city = city;

}

public String getRegion() { return region; }

public void setRegion(String region) {

this.region = region;

}

public String getCountry() { return country; }

public void setCountry(String country) {

this.country = country;

}

public String getCondition() { return condition; }

public void setCondition(String condition) {

this.condition = condition;

}

public String getTemp() { return temp; }

public void setTemp(String temp) {

this.temp = temp;

}

public String getChill() { return chill; }

public void setChill(String chill) {

this.chill = chill;

}

public String getHumidity() { return humidity; }

public void setHumidity(String humidity) {

this.humidity = humidity;

}

}

// Weather service impl

package com.weather.app.service;

import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;

import org.dom4j.Document;
import org.dom4j.DocumentFactory;
import org.dom4j.io.SAXReader;

public class YahooParser {

public Weather parse(InputStream inputStream) throws Exception {
Weather weather = new Weather();

SAXReader xmlReader = createXmlReader();
Document doc = xmlReader.read( inputStream );

weather.setCity(
doc.valueOf("/rss/channel/y:location/@city") );
weather.setRegion(
doc.valueOf("/rss/channel/y:location/@region") );
weather.setCountry(
doc.valueOf("/rss/channel/y:location/@country") );
weather.setCondition(
doc.valueOf("/rss/channel/item/y:condition/@text") );
weather.setTemp(
doc.valueOf("/rss/channel/item/y:condition/@temp") );
weather.setChill(
doc.valueOf("/rss/channel/y:wind/@chill") );
weather.setHumidity(
doc.valueOf("/rss/channel/y:atmosphere/@humidity") );

return weather;
}

private SAXReader createXmlReader() {
Map<String,String> uris = new HashMap<String,String>();
uris.put( "y", "http://xml.weather.yahoo.com/ns/rss/1.0" );

DocumentFactory factory = new DocumentFactory();
factory.setXPathNamespaceURIs( uris );

SAXReader xmlReader = new SAXReader();
xmlReader.setDocumentFactory( factory );
return xmlReader;
}
}

package com.weather.app.service;

import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;

public class YahooRetriever {

public InputStream retrieve(String zipcode) throws Exception {
String url = "http://weather.yahooapis.com/forecastrss?p="
+ zipcode;
URLConnection conn = new URL(url).openConnection();
return conn.getInputStream();
}
}

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