英文:
How to convert PDF-files to PNG-images concurrently?
问题
以下是您要求的翻译内容：
我有一个情景，需要同时将多个PDF文件转换为PNG图像。虽然可以使用Java 8的并行流来实现，但我需要在Java 7上执行。
这是我用于将PDF转换为PNG的代码片段，不使用并行处理，并使用PDFBox库。
PDDocument document = PDDocument.load(new File(pdfFilename));
PDFRenderer pdfRenderer = new PDFRenderer(document);
for (int page = 0; page < document.getNumberOfPages(); ++page)
{
BufferedImage bim = pdfRenderer.renderImageWithDPI(page, 300, ImageType.RGB);
ImageIOUtil.writeImage(bim, pdfFilename + "-" + (page+1) + ".png", 300);
}
document.close();
请您提供一些方法来解决这个问题。
英文:
I have a scenario, where I need to convert multiple PDF-files to PNG-images concurrently. Although it can be doable using Java 8 Parallel Streams, I need it to be executed on Java 7.
This is the snippet which I use to convert PDF to PNG without parallel processing and by using PDFBox.
PDDocument document = PDDocument.load(new File(pdfFilename));
PDFRenderer pdfRenderer = new PDFRenderer(document);
for (int page = 0; page < document.getNumberOfPages(); ++page)
{
BufferedImage bim = pdfRenderer.renderImageWithDPI(page, 300, ImageType.RGB);
ImageIOUtil.writeImage(bim, pdfFilename + "-" + (page+1) + ".png", 300);
}
document.close();
Kindly, please suggest some approach to tackle this.
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