小编use*_*746的帖子

使用pdfbox,是否可以将PDF(或PDF字节[])转换为图像字节[]？我在网上查看了几个例子,我发现的唯一一个例子描述了如何直接将转换后的文件写入文件系统或将其转换为Java AWT对象.

我宁愿不招致将图像文件写入文件系统的IO,读入byte [],然后删除它.

所以我可以这样做:

String destinationImageFormat = "jpg";
boolean success = false;
InputStream is = getClass().getClassLoader().getResourceAsStream("example.pdf");
PDDocument pdf = PDDocument.load( is, true );

int resolution = 256;
String password = "";
String outputPrefix = "myImageFile";

PDFImageWriter imageWriter = new PDFImageWriter();    

success = imageWriter.writeImage(pdf, 
                    destinationImageFormat, 
                    password, 
                    1, 
                    2, 
                    outputPrefix, 
                    BufferedImage.TYPE_INT_RGB, 
                    resolution);

除此之外:

InputStream is = getClass().getClassLoader().getResourceAsStream("example.pdf");

PDDocument pdf = PDDocument.load( is, true );
List<PDPage> pages = pdf.getDocumentCatalog().getAllPages();

for ( PDPage page : pages )
{
    BufferedImage image = page.convertToImage();
} …