Java Community | Help. Code. Learn.•3y ago

Cannot get inputStream from web url. Why?

I'm trying to create a book with an image in JUnit test using

MockMultipartFile

MockMultipartFile

MockMultipartFile

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();
        }
    }

    @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();
        }
    }

JavaBot•5/31/23, 6:58 PM

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Tomasm21OP•5/31/23, 6:58 PM

Lets continue code:

Tomasm21OP•5/31/23, 6:59 PM

createMultipartFileFromURLcreateMultipartFileFromURL :

    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•5/31/23, 7:00 PM

The_rest_methods.txt1.84KB

Tomasm21OP•5/31/23, 7:01 PM

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

Tomasm21OP•5/31/23, 7:01 PM

Why is that?

Plummip•5/31/23, 7:56 PM

What do you mean with cannot get input stream?

Plummip•5/31/23, 8:09 PM

A inputstream is used as a temporary buffer to read data from; given by a source.
You are able to "empty" the stream by reading data from the stream.
If you read data and then assign that to an image. If its used all the bytes available there is nothing left to pull out.
But afterwards your calling the stream again and try to read bytes from it. inputStream.readAllBytes.length.

In some cases the inputstream could be filled again by the source but in this case i dont think thats likely.

Tomasm21OP•5/31/23, 8:13 PM

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

Plummip•5/31/23, 8:18 PM

Well ye its used as in interface to read data from a source (file, connection, a byte array). Youd possibly want to read data from that source and then close the stream.

JavaBot•6/1/23, 1:20 AM

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Cannot get inputStream from web url. Why?

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