Itext Image format cannot be recognized.

原创已于 2023-07-19 09:30:11 修改 · 1.6k 阅读

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于 2023-07-19 09:28:11 首次发布

在尝试使用iText将WebP格式的漫画图片下载并制作成PDF时，由于Java不支持WebP格式，导致IOException。通过引入com.twelvemonkeys.imageio:imageio-webp:3.9.4作为第三方依赖，先将WebP图片转换为JPEG，然后添加到PDF中，成功解决了图片格式不被识别的问题。

部署运行你感兴趣的模型镜像

功能需求是下载漫画图片，制作pdf，遇到无法识别的图片，图片类型为 webp，Java本身是不支持的，需要借助第三依赖兼容处理。此问题跟 itext 版本没有关系。

依赖

implementation "com.itextpdf:io:8.0.0"
implementation "com.itextpdf:forms:8.0.0"
implementation "com.itextpdf:kernel:8.0.0"
implementation "com.itextpdf:layout:8.0.0"

问题复现

public static void main(String[] args) throws Exception {

    OutputStream outputStream = new FileOutputStream("sample.pdf");
    PdfWriter pdfWriter = new PdfWriter(outputStream);
    PdfDocument pdfDocument = new PdfDocument(pdfWriter);

    URL url = new URL("https://w3wx1.godamanga.online/scomic/quanqiuguiyishidai-heibaichayuanzhuqixiaoguai/0/114-azu7/10.jpg");
    Document document = new Document(pdfDocument);

    ImageData imageData = ImageDataFactory.create(url);
    Image image = new Image(imageData);

    document.add(image);

    document.close();
}

报错信息如下

Exception in thread "main" com.itextpdf.io.exceptions.IOException: Image format cannot be recognized.
	at com.itextpdf.io.image.ImageDataFactory.createImageInstance(ImageDataFactory.java:478)
	at com.itextpdf.io.image.ImageDataFactory.create(ImageDataFactory.java:68)
	at com.itextpdf.io.image.ImageDataFactory.create(ImageDataFactory.java:77)
	at io.arukas.ImgPdfSample.main(ImgPdfSample.java:41)

解决方案

implementation 'com.twelvemonkeys.imageio:imageio-webp:3.9.4'

public static void main(String[] args) throws Exception {

        OutputStream outputStream = new FileOutputStream("sample.pdf");
        PdfWriter pdfWriter = new PdfWriter(outputStream);
        PdfDocument pdfDocument = new PdfDocument(pdfWriter);

        URL url = new URL("https://w3wx1.godamanga.online/scomic/quanqiuguiyishidai-heibaichayuanzhuqixiaoguai/0/114-azu7/10.jpg");
        Document document = new Document(pdfDocument);
        document.setMargins(0, 0, 0, 0);
        ImageData imageData;
        try {
            imageData = ImageDataFactory.create(url);
        } catch (Exception e) {
            BufferedImage read = ImageIO.read(url);
            ByteArrayOutputStream baStream = new ByteArrayOutputStream();
            ImageIO.write(read, "jpg", baStream);
            imageData = ImageDataFactory.create(baStream.toByteArray());
        }
        Image image = new Image(imageData);
        pdfDocument.setDefaultPageSize(new PageSize(image.getImageWidth(), image.getImageHeight()));
        document.add(image);

        document.close();
    }