Java Community | Help. Code. Learn.•2y ago

Cannot get inputStream from web url. Why?

I'm trying to create a book with an image in JUnit test using MockMultipartFile. But for unknown reasons the stream cannot be taken. Why?

    @Test
    @Order(2)
    void testCreateBookWithAnImage() {
        BookRequestDTO bookDto = new BookRequestDTO();
        bookDto.setTitle("New Book With Image");
        bookDto.setAuthor("Name Surname");
        bookDto.setSummary("Instructions how to add an image and asociate it with the Book object");
        bookDto.setIsbn("555556666");
        bookDto.setYear(2023);
        bookDto.setPages(20);
        bookDto.setCirculation(3);
        bookDto.setCategory("Novel");
        
        MultipartFile file = null;
        
        try {
            file = createMultipartFileFromURL("https://cdn.pixabay.com/photo/2014/09/05/18/32/old-books-436498_1280.jpg");
            // file = createMultipartFileFromURL("https://pngimg.com/uploads/pineapple/pineapple_PNG2755.png");
        } catch (IOException e) {
            e.printStackTrace();
        }
        
        try {
            Book createdBook = bookService.addNewBookWithImage(bookDto, file);
            assertEquals("New Book With Image", createdBook.getTitle());
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @Test
    @Order(2)
    void testCreateBookWithAnImage() {
        BookRequestDTO bookDto = new BookRequestDTO();
        bookDto.setTitle("New Book With Image");
        bookDto.setAuthor("Name Surname");
        bookDto.setSummary("Instructions how to add an image and asociate it with the Book object");
        bookDto.setIsbn("555556666");
        bookDto.setYear(2023);
        bookDto.setPages(20);
        bookDto.setCirculation(3);
        bookDto.setCategory("Novel");
        
        MultipartFile file = null;
        
        try {
            file = createMultipartFileFromURL("https://cdn.pixabay.com/photo/2014/09/05/18/32/old-books-436498_1280.jpg");
            // file = createMultipartFileFromURL("https://pngimg.com/uploads/pineapple/pineapple_PNG2755.png");
        } catch (IOException e) {
            e.printStackTrace();
        }
        
        try {
            Book createdBook = bookService.addNewBookWithImage(bookDto, file);
            assertEquals("New Book With Image", createdBook.getTitle());
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

8 Replies

JavaBot•2y ago

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Tomasm21OP•2y ago

Lets continue code: createMultipartFileFromURL :

    public static MockMultipartFile createMultipartFileFromURL(String imageUrl) throws IOException {
        URL url = new URL(imageUrl);
        URLConnection connection = url.openConnection();
        connection.setConnectTimeout(5000);
        connection.setReadTimeout(5000);
        
        try (InputStream inputStream = connection.getInputStream()) {
            BufferedImage image = ImageIO.read(inputStream);
            
            // Extract image properties
            String format = getImageFormat(image);
            String contentType = getContentType(format);
            String fileExtension = getFileExtension(format);
            System.out.println("\nBookServiceTest: File size: "+inputStream.readAllBytes().length);
            System.out.println("BookServiceTest: Format: "+format);
            System.out.println("BookServiceTest: Content type: "+contentType);
            System.out.println("BookServiceTest: File extension: "+fileExtension+"\n");

            // Convert image to MockMultipartFile
            return new MockMultipartFile("The book", "The book." + fileExtension, contentType, inputStream);
        } catch (IOException e) {
            // Handle the exception when there is no internet connection or openStream fails
            e.printStackTrace();
            throw new IOException("Failed to retrieve the image from the URL: " + imageUrl, e);
        }
    }

    public static MockMultipartFile createMultipartFileFromURL(String imageUrl) throws IOException {
        URL url = new URL(imageUrl);
        URLConnection connection = url.openConnection();
        connection.setConnectTimeout(5000);
        connection.setReadTimeout(5000);
        
        try (InputStream inputStream = connection.getInputStream()) {
            BufferedImage image = ImageIO.read(inputStream);
            
            // Extract image properties
            String format = getImageFormat(image);
            String contentType = getContentType(format);
            String fileExtension = getFileExtension(format);
            System.out.println("\nBookServiceTest: File size: "+inputStream.readAllBytes().length);
            System.out.println("BookServiceTest: Format: "+format);
            System.out.println("BookServiceTest: Content type: "+contentType);
            System.out.println("BookServiceTest: File extension: "+fileExtension+"\n");

            // Convert image to MockMultipartFile
            return new MockMultipartFile("The book", "The book." + fileExtension, contentType, inputStream);
        } catch (IOException e) {
            // Handle the exception when there is no internet connection or openStream fails
            e.printStackTrace();
            throw new IOException("Failed to retrieve the image from the URL: " + imageUrl, e);
        }
    }

Tomasm21OP•2y ago

The_rest_methods.txt

Tomasm21OP•2y ago

Then this part:

            System.out.println("\nBookServiceTest: File size: "+inputStream.readAllBytes().length);
            System.out.println("BookServiceTest: Format: "+format);
            System.out.println("BookServiceTest: Content type: "+contentType);
            System.out.println("BookServiceTest: File extension: "+fileExtension+"\n");

            System.out.println("\nBookServiceTest: File size: "+inputStream.readAllBytes().length);
            System.out.println("BookServiceTest: Format: "+format);
            System.out.println("BookServiceTest: Content type: "+contentType);
            System.out.println("BookServiceTest: File extension: "+fileExtension+"\n");

results in:

    where
        c1_0.id=?

BookServiceTest: File size: 0
BookServiceTest: Format: jpg
BookServiceTest: Content type: image/jpeg
BookServiceTest: File extension: jpg

Hibernate: 
    select

    where
        c1_0.id=?

BookServiceTest: File size: 0
BookServiceTest: Format: jpg
BookServiceTest: Content type: image/jpeg
BookServiceTest: File extension: jpg

Hibernate: 
    select

Why is that?

Unknown User•2y ago

Message Not Public

Tomasm21OP•2y ago

ohh.. Its temporary. Ok I will read all bytes to byte array

Unknown User•2y ago

Message Not Public

JavaBot•2y ago

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Cannot get inputStream from web url. Why?