1. Fetch weather data Realtime in Java using OpenWeatherMap API

Java-Based Weather Forecasting: Real-Time Data Fetching using OpenWeatherMap API

This project aims to develop a java application that fetches and displays real-time weather data using the OpenWeatherMap API. This will allow users to input a location and will then retrieve and display the current weather conditions.

Code:

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Scanner;

public class WeatherData {
    private static final String API_KEY = "b2f570d96d0cc4d1465599ecbeb7747d";
    private static final String API_URL = "http://api.openweathermap.org/data/2.5/weather?q=%s&appid=%s";

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("Enter the name of the city: ");
        String city = scanner.nextLine();

        try {
            String url = String.format(API_URL, city, API_KEY);
            HttpURLConnection conn = (HttpURLConnection) new URL(url).openConnection();
            conn.setRequestMethod("GET");

            BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            String inputLine;
            StringBuffer response = new StringBuffer();

            while ((inputLine = in.readLine()) != null) {
                response.append(inputLine);
            }
            in.close();

            System.out.println("Raw Weather Data for " + city + ": " + response.toString());

        } catch (Exception e) {
            System.out.println("Error: " + e.getMessage());
        }
    }
}

Output:

Enter the name of the city: Bengaluru
Raw Weather Data for Bengaluru: {"coord":{"lon":77.6033,"lat":12.9762},
"weather":[{"id":802,"main":"Clouds","description":"scattered clouds","icon":"03d"}],
"base":"stations",
"main":{"temp":298.73,
"feels_like":299.46,"temp_min":297.05,
"temp_max":298.95,"pressure":1015,"humidity":81},
"visibility":6000,
"wind":{"speed":3.09,"deg":220},
"clouds":{"all":40},"dt":1717735283,
"sys":{"type":1,"id":9205,"country":"IN","sunrise":1717719761,
"sunset":1717766072},
"timezone":19800,"id":1277333,
"name":"Bengaluru","cod":200}.