Obsługa JSONa za pomocą jakarta.json

PC33-RestKlient/pom.xml

@@ -21,4 +21,20 @@
 			</plugin>
 		</plugins>
 	</build>
+
+	<dependencies>
+		<!-- implementacje technilogii Jakarta JSON P - glassfish to starsza wersja, a Eclipse Parsson to nowsza -->
+		<!--
+		<dependency>
+		    <groupId>org.glassfish</groupId>
+		    <artifactId>jakarta.json</artifactId>
+		    <version>2.0.1</version>
+		</dependency>
+		-->
+		<dependency>
+			<groupId>org.eclipse.parsson</groupId>
+			<artifactId>parsson</artifactId>
+			<version>1.1.4</version>
+		</dependency>
+	</dependencies>
 </project>
\ No newline at end of file

PC33-RestKlient/src/main/java/sklep/klient/Klient02_URL_JSON.java

+package sklep.klient;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URL;
+
+import jakarta.json.Json;
+import jakarta.json.JsonArray;
+import jakarta.json.JsonReader;
+import jakarta.json.JsonValue;
+
+public class Klient02_URL_JSON {
+
+	public static void main(String[] args) {
+		try {
+			URL url = new URL(Ustawienia.ADRES_USLUGI + "/products.json");
+			try(InputStream inputStream = url.openStream();
+				JsonReader reader = Json.createReader(inputStream)) {
+				JsonArray array = reader.readArray();
+				// System.out.println(array);
+				for(JsonValue jsonValue : array) {
+					//System.out.println(jsonValue);
+					System.out.println(jsonValue.asJsonObject().getString("productName"));
+					System.out.println("    opis: " + jsonValue.asJsonObject().getString("description", ""));
+					System.out.println("    cena: " + jsonValue.asJsonObject().getJsonNumber("price").bigDecimalValue());
+				}
+			}
+		} catch (IOException e) {
+			e.printStackTrace();
+		}
+	}
+
+}

PC33-RestKlient/src/main/java/sklep/klient/Klient05_HttpClient_JSON.java

+package sklep.klient;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.net.http.HttpClient;
+import java.net.http.HttpRequest;
+import java.net.http.HttpResponse;
+import java.net.http.HttpResponse.BodyHandlers;
+
+import jakarta.json.Json;
+import jakarta.json.JsonArray;
+import jakarta.json.JsonObject;
+import jakarta.json.JsonReader;
+import jakarta.json.JsonValue;
+
+public class Klient05_HttpClient_JSON {
+
+    public static void main(String[] args) {
+        try {
+            JsonArray array = pobierzJsona(Ustawienia.ADRES_USLUGI + "/products.json");
+            for(JsonValue jsonValue : array) {
+                JsonObject jsonObject = jsonValue.asJsonObject();
+                System.out.println(jsonObject.getString("productName"));
+                if(jsonObject.containsKey("description")) {
+                    System.out.println("    opis: " + jsonObject.getString("description", ""));
+                }
+                System.out.println("    cena: " + jsonObject.getJsonNumber("price").bigDecimalValue());
+            }
+        } catch (IOException | InterruptedException | URISyntaxException e) {
+            e.printStackTrace();
+        }
+    }
+
+    private static JsonArray pobierzJsona(String adres) throws IOException, InterruptedException, URISyntaxException {
+        HttpClient httpClient = HttpClient.newHttpClient();
+        URI uri = new URI(adres);
+        HttpRequest request = HttpRequest.newBuilder(uri).build();
+        HttpResponse<InputStream> response = httpClient.send(request, BodyHandlers.ofInputStream());
+        System.out.println("response " + response);
+        System.out.println("status: " + response.statusCode());
+        System.out.println("Content-Type: " + response.headers().firstValue("Content-Type").orElse("BRAK"));
+        return wczytajJsona(response.body());
+    }
+
+    private static JsonArray wczytajJsona(InputStream input) {
+        try(JsonReader reader = Json.createReader(input)) {
+            return reader.readArray();
+        }
+    }
+
+}