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|  How to Get Air Quality Index Using AirVisual API in Java

How to Get Air Quality Index Using AirVisual API in Java

October 31, 2024

Explore how to retrieve AQI data using AirVisual API in Java. This guide provides step-by-step instructions for seamless integration and accurate air quality monitoring.

How to Get Air Quality Index Using AirVisual API in Java

 

Set Up HTTP Client

 

  • In Java, you can use libraries like `HttpURLConnection`, Apache HttpClient, or OkHttp to make HTTP requests. The newer `java.net.http.HttpClient` introduced in Java 11 is also a great option.
  • For this example, we will use `java.net.http.HttpClient`.

 

import java.net.http.HttpClient;

HttpClient client = HttpClient.newHttpClient();

 

Construct the Request

 

  • AirVisual API provides a variety of endpoints. For this example, use the "nearest\_city" endpoint to get the air quality information of the nearest city based on your location.
  • You will need an API key that you got during the set-up process.

 

import java.net.http.HttpRequest;
import java.net.URI;

String apiKey = "your_api_key";
String url = String.format("https://api.airvisual.com/v2/nearest_city?key=%s", apiKey);

HttpRequest request = HttpRequest.newBuilder()
    .uri(URI.create(url))
    .GET()
    .build();

 

Send the Request

 

  • Use `HttpClient` to send the built request. This can be done synchronously or asynchronously.
  • In this example, we will use a synchronous request with `send` method.

 

import java.net.http.HttpResponse;

HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());

 

Process the Response

 

  • The API will return a JSON response that contains the air quality information. You need to parse this JSON to extract relevant data.
  • Use a library like `org.json` or `Gson` to process the JSON object in your Java code.

 

import org.json.JSONObject;

String responseBody = response.body();
JSONObject jsonObj = new JSONObject(responseBody);

int aqi = jsonObj.getJSONObject("data").getJSONObject("current").getJSONObject("pollution").getInt("aqius");

System.out.println("The Air Quality Index (AQI) is: " + aqi);

 

Error Handling

 

  • It's important to handle potential exceptions, such as `IOException`, `InterruptedException`, and JSON parsing exceptions.
  • Ensure your code gracefully manages different kinds of issues that might arise during the HTTP request or response processing.

 

try {
    //... code to make request ...
} catch (IOException | InterruptedException e) {
    e.printStackTrace();
    System.out.println("An error occurred while fetching the Air Quality Index.");
} catch (JSONException e) {
    System.out.println("Error parsing JSON response.");
}

 

Optimize and Extend

 

  • Consider adding support for additional error handling, logging, and code to manage retries in case of temporary network issues.
  • Extend your implementation to handle different endpoints provided by AirVisual API if needed.
  • Ensure your application complies with API limits to avoid being blocked due to excessive requests.

 

These steps provide a comprehensive guide on how to retrieve Air Quality Index data using the AirVisual API in Java.

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