Przykłady RestClient wykorzystujące klasy modelu

PC33-RestKlient/src/main/java/sklep/klient/Klient14_RestClient_PDF.java

+package sklep.klient;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.nio.file.StandardCopyOption;
+
+import jakarta.ws.rs.client.Client;
+import jakarta.ws.rs.client.ClientBuilder;
+import jakarta.ws.rs.client.WebTarget;
+import jakarta.ws.rs.core.MediaType;
+import jakarta.ws.rs.core.Response;
+
+public class Klient14_RestClient_PDF {
+	
+	private static final MediaType PDF_TYPE = new MediaType("application", "pdf");
+
+	public static void main(String[] args) {
+		int productId = 1;
+		
+		System.out.println("Startujemy...");
+		Client client = ClientBuilder.newClient();
+		
+		WebTarget root = client.target(Ustawienia.ADRES_USLUGI);
+		
+		Response response = root
+				.path("products")
+				.path("{id}")
+				.resolveTemplate("id", productId)
+				.request()
+				.accept(PDF_TYPE)
+				.buildGet()
+				.invoke();
+
+		System.out.println("Otrzymałem response: " + response);
+		System.out.println("Status: " + response.getStatus());
+		System.out.println("Content-Type: " + response.getMediaType());
+		
+		if(response.getStatus() != 200) {
+			System.out.println("Chyba coś nie tak, więc przerywam.");
+			return;
+		}
+		
+		String nazwaPliku = "wynik.pdf";
+		String contentDisposition = response.getHeaderString("Content-Disposition");
+		if(contentDisposition != null && contentDisposition.contains(";filename=")) {
+			nazwaPliku = contentDisposition.split(";filename=")[1];
+		}
+		
+		try(InputStream strumienDanych = response.readEntity(InputStream.class)) {
+			long ileBajtow = Files.copy(strumienDanych, Paths.get(nazwaPliku), StandardCopyOption.REPLACE_EXISTING);
+			System.out.printf("Zapisano %d bajtów do pliku %s\n", ileBajtow, nazwaPliku);
+		} catch (IOException e) {
+			e.printStackTrace();
+		}
+		System.out.println("Gotowe");
+	}
+
+}

PC33-RestKlient/src/main/java/sklep/klient/Klient21_RestClient_JAXB.java

+package sklep.klient;
+
+import jakarta.ws.rs.client.Client;
+import jakarta.ws.rs.client.ClientBuilder;
+import jakarta.ws.rs.core.Response;
+import sklep.model.Product;
+import sklep.model.ProductList;
+
+public class Klient21_RestClient_JAXB {
+
+	public static void main(String[] args) {
+		Client client = ClientBuilder.newClient();
+		
+		Response response = client.target(Ustawienia.ADRES_USLUGI)
+			.path("products.xml")
+			.request()
+			.buildGet()
+			.invoke();
+		
+		System.out.println("Mam odpowiedź: " + response);
+		System.out.println("Status: " + response.getStatus());
+		System.out.println("C-Type: " + response.getMediaType());
+		System.out.println("Length: " + response.getLength());
+		
+		ProductList products = response.readEntity(ProductList.class);
+		
+		System.out.println("Otrzymane dane:");
+		for (Product product : products.getProducts()) {
+			System.out.println(product);
+		}
+	}
+
+}

PC33-RestKlient/src/main/java/sklep/klient/Klient22_RestClient_JSON.java

+package sklep.klient;
+
+import java.util.List;
+
+import jakarta.ws.rs.client.Client;
+import jakarta.ws.rs.client.ClientBuilder;
+import jakarta.ws.rs.core.GenericType;
+import jakarta.ws.rs.core.Response;
+import sklep.model.Product;
+
+public class Klient22_RestClient_JSON {
+
+    public static void main(String[] args) {
+        Client client = ClientBuilder.newClient();
+        
+        Response response = client.target(Ustawienia.ADRES_USLUGI)
+            .path("products.json")
+            .request()
+            .buildGet()
+            .invoke();
+        
+        System.out.println("Mam odpowiedź: " + response);
+        System.out.println("Status: " + response.getStatus());
+        System.out.println("C-Type: " + response.getMediaType());
+        System.out.println("Length: " + response.getLength());
+        
+        // Ponieważ wersja JSON na serwerze zwraca wynik typu List<Product>, to tutaj musimy podać "typ generyczny",
+        // a nie wystarczy zwykła klasa.
+        // Nie zadziała:
+        // List<Product> products = response.readEntity(List.class);
+            
+        GenericType<List<Product>> typListy = new GenericType<>() {}; 
+        List<Product> products = response.readEntity(typListy);
+        for(Product product : products) {
+            System.out.println(product);
+        }
+    }
+
+}

PC33-RestKlient/src/main/java/sklep/klient/Klient23_RestClient_JSON_JedenProdukt.java

+package sklep.klient;
+
+import jakarta.ws.rs.client.Client;
+import jakarta.ws.rs.client.ClientBuilder;
+import jakarta.ws.rs.core.MediaType;
+import jakarta.ws.rs.core.Response;
+import sklep.model.Product;
+
+public class Klient23_RestClient_JSON_JedenProdukt {
+
+	public static void main(String[] args) {
+		Client client = ClientBuilder.newClient();
+		
+		Response response = client.target(Ustawienia.ADRES_USLUGI)
+			.path("products")
+			.path("1")
+			.request()
+			.accept(MediaType.APPLICATION_JSON)
+			.buildGet()
+			.invoke();
+		
+		System.out.println("Mam odpowiedź: " + response);
+		System.out.println("Status: " + response.getStatus());
+		System.out.println("C-Type: " + response.getMediaType());
+		System.out.println("Length: " + response.getLength());
+		
+		Product product = response.readEntity(Product.class);
+		System.out.println("Odczytany produkt: " + product);
+	}
+
+}

PC33-RestKlient/src/main/java/sklep/klient/Klient24_Interaktywny.java

+package sklep.klient;
+
+import java.math.BigDecimal;
+import java.util.Scanner;
+
+import jakarta.ws.rs.client.Client;
+import jakarta.ws.rs.client.ClientBuilder;
+import jakarta.ws.rs.client.Entity;
+import jakarta.ws.rs.client.WebTarget;
+import jakarta.ws.rs.core.MediaType;
+import jakarta.ws.rs.core.Response;
+import sklep.model.Product;
+
+public class Klient24_Interaktywny {
+
+	public static void main(String[] args) {
+		System.out.println("Startujemy...");
+		Scanner scanner = new Scanner(System.in);
+		
+		Client client = ClientBuilder.newClient();
+		WebTarget path = client.target(Ustawienia.ADRES_USLUGI)
+				.path("products")
+				.path("{id}");
+		
+		System.out.println("Przygotowana ścieżka: " + path);
+
+		while (true) {
+			System.out.print("\nPodaj id: ");
+			int id = scanner.nextInt();
+			if(id == 0) break;
+			
+			Response response = path
+					.resolveTemplate("id", id)
+					.request(MediaType.APPLICATION_JSON)
+					.get();
+			
+			System.out.println("Status: " + response.getStatus());
+			System.out.println("Content-Type: " + response.getMediaType());
+			if (response.getStatus() == 200) {
+				Product product = response.readEntity(Product.class);
+				System.out.println("Mam produkt:");
+				System.out.println("  Nazwa: " + product.getProductName());
+				System.out.println("  Cena: " + product.getPrice());
+				System.out.println("  Opis: " + product.getDescription());
+				System.out.println();
+				System.out.println("Podaj zmianę ceny (0 aby nie zmieniać):");
+				BigDecimal zmianaCeny = scanner.nextBigDecimal();
+				if(zmianaCeny.compareTo(BigDecimal.ZERO) != 0) {
+					BigDecimal newPrice = product.getPrice().add(zmianaCeny);
+					System.out.println("PUT nowej ceny...");
+					Response odpPut = path.path("price").resolveTemplate("id", id).request()
+							.put(Entity.entity(newPrice, MediaType.TEXT_PLAIN_TYPE));
+					System.out.println("PUT zakończył się kodem " + odpPut.getStatus());
+				}
+			} else {
+				System.out.println("nie mogę odczytać");
+			}
+		}
+	}
+
+}