How Can I Easily Read JSON Data from a URL in Java?

Easiest JSON Reading from URL in Java

In Java, reading and parsing JSON from a URL can be straightforward with the help of a third-party library. Consider using the org.json:json Maven artifact for its brevity.

The simplest approach involves:

1. Importing the dependency: Include the dependency in your Maven project to access the JSON parsing functionality.
2. Using the readJsonFromUrl method: This method takes a URL as a parameter and returns a JSONObject after reading and parsing the JSON content at that URL.

A concise example using this dependency is provided below:

import org.json.JSONException;
import org.json.JSONObject;

import java.io.IOException;
import java.net.URL;

public class JsonReader {

    public static void main(String[] args) throws IOException, JSONException {
        // Read the JSON
        JSONObject json = readJsonFromUrl("https://graph.facebook.com/19292868552");

        // Process the JSON
        System.out.println(json.toString()); // Print the entire JSON as a string
        System.out.println(json.get("id")); // Access a specific property by name
    }

    private static JSONObject readJsonFromUrl(String url) throws IOException, JSONException {
        // Open the URL
        URL urlObject = new URL(url);

        // Read the JSON
        InputStream is = urlObject.openStream();
        BufferedReader rd = new BufferedReader(new InputStreamReader(is, "UTF-8"));
        String jsonText = rd.readLine();

        // Parse the JSON
        JSONObject json = new JSONObject(jsonText);

        // Cleanup
        is.close();
        rd.close();

        return json;
    }
}

This snippet reads the JSON from the supplied URL, parses it into a JSONObject, and demonstrates how to retrieve a specific property by name. It offers a compact and convenient way to handle JSON data from a URL in Java.

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