#20 - Java

Author: ASJordi

Roadmap/20 - PETICIONES HTTP/java/asjordi.java

@@ -0,0 +1,126 @@
+package dev.asjordi.r20;
+
+import com.google.gson.Gson;
+import com.google.gson.JsonObject;
+import java.net.URI;
+import java.net.http.HttpClient;
+import java.net.http.HttpRequest;
+import java.net.http.HttpResponse;
+import java.util.Scanner;
+
+public class Main {
+
+    public static void main(String[] args) throws Exception {
+        getRequest("https://www.google.com");
+        getPokemon();
+    }
+
+    /**
+     * EJERCICIO:
+     * Utilizando un mecanismo de peticiones HTTP de tu lenguaje, realiza
+     * una petición a la web que tú quieras, verifica que dicha petición
+     * fue exitosa y muestra por consola el contenido de la web.
+     */
+    public static void getRequest(String url) throws Exception {
+        HttpClient client = HttpClient.newHttpClient();
+        HttpRequest request = HttpRequest.newBuilder()
+                .uri(URI.create(url))
+                .build();
+
+        HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
+
+        if (response.statusCode() != 200) throw new Exception("Request failed with status code: " + response.statusCode());
+        else System.out.println(response.body());
+    }
+
+    /**
+     * DIFICULTAD EXTRA (opcional):
+     * Utilizando la PokéAPI (https://pokeapi.co), crea un programa por
+     * terminal al que le puedas solicitar información de un Pokémon concreto
+     * utilizando su nombre o número.
+     * - Muestra el nombre, id, peso, altura y tipo(s) del Pokémon
+     * - Muestra el nombre de su cadena de evoluciones
+     * - Muestra los juegos en los que aparece
+     * - Controla posibles errores
+     */
+    public static void getPokemon() {
+        Scanner sc = new Scanner(System.in);
+        Gson gson = new Gson();
+
+        System.out.println("Introduce el nombre o número del Pokémon:");
+        String param = sc.nextLine();
+
+        String baseUrl = String.format("https://pokeapi.co/api/v2/pokemon/%s", param);
+        var getBaseResponse = sendRequest(baseUrl);
+        if (getBaseResponse.statusCode() != 200) System.out.println("Error: " + getBaseResponse.statusCode());
+        String baseResponseBody = getBaseResponse.body();
+        JsonObject data = gson.fromJson(baseResponseBody, JsonObject.class);
+
+        String id = data.get("id").getAsString();
+        String name = data.get("name").getAsString();
+        String weight = data.get("weight").getAsString();
+        String height = data.get("height").getAsString();
+
+        String chainUrl = String.format("https://pokeapi.co/api/v2/evolution-chain/%s", id);
+        var getChainResponse = sendRequest(chainUrl);
+        if (getChainResponse.statusCode() != 200) System.out.println("Error: " + getChainResponse.statusCode());
+        String chainResponseBody = getChainResponse.body();
+        JsonObject chainData = gson.fromJson(chainResponseBody, JsonObject.class);
+
+        var types = data.getAsJsonArray("types");
+        StringBuilder typeNames = new StringBuilder();
+        for (int i = 0; i < types.size(); i++) {
+            JsonObject type = types.get(i).getAsJsonObject().getAsJsonObject("type");
+            typeNames.append(type.get("name").getAsString());
+            if (i < types.size() - 1) typeNames.append(", ");
+        }
+
+        var gameIndices = data.getAsJsonArray("game_indices");
+        StringBuilder gameNames = new StringBuilder();
+        for (int i = 0; i < gameIndices.size(); i++) {
+            JsonObject game = gameIndices.get(i).getAsJsonObject().getAsJsonObject("version");
+            gameNames.append(game.get("name").getAsString());
+            if (i < gameIndices.size() - 1) gameNames.append(", ");
+        }
+
+        var chain = chainData.getAsJsonObject("chain");
+        StringBuilder evolutionNames = new StringBuilder();
+        getEvolutions(chain, evolutionNames);
+
+        System.out.println("ID: " + id);
+        System.out.println("Nombre: " + name);
+        System.out.println("Peso: " + weight);
+        System.out.println("Altura: " + height);
+        System.out.println("Tipos: " + typeNames.toString());
+        System.out.println("Las evoluciones de " + name + " son: " + evolutionNames.toString());
+        System.out.println("Aparece en los juegos: " + gameNames.toString());
+    }
+
+    private static void getEvolutions(JsonObject chain, StringBuilder evolutionNames) {
+        String chainName = chain.getAsJsonObject("species").get("name").getAsString();
+        evolutionNames.append(chainName);
+
+        var evolutions = chain.getAsJsonArray("evolves_to");
+        for (int i = 0; i < evolutions.size(); i++) {
+            evolutionNames.append(" -> ");
+            getEvolutions(evolutions.get(i).getAsJsonObject(), evolutionNames);
+        }
+    }
+
+    private static HttpResponse<String> sendRequest(String url) {
+        HttpClient client = HttpClient.newHttpClient();
+        HttpRequest getRequest = HttpRequest.newBuilder()
+                .uri(URI.create(url))
+                .GET()
+                .build();
+        HttpResponse<String> getResponse = null;
+
+        try {
+            getResponse = client.send(getRequest, HttpResponse.BodyHandlers.ofString());
+        } catch (Exception e) {
+            System.out.println("Error: " + e.getMessage());
+        }
+
+        return getResponse;
+    }
+}