Java：使用 PDFBox 库从图像创建 PDF 页面
问题我需要将图像（主要是 JPEG）直接转换为 PDF 文档的 PDF 页面。
可能是图像大小不同。
每个 PDF 页面都应具有与图像相同的精确尺寸。
所以每个页面只包含全分辨率图像。
我怎样才能做到这一点，即页面设置为图像/内容的尺寸？
因为我看到 PDF 文件具有不同的页面大小和方向，但是如何使用 PDFBox 实现这一点？
回答
我已经用以下代码解决了这个问题：
PDDocument document = new PDDocument();
InputStream in = new FileInputStream(someImage);
BufferedImage bimg = ImageIO.read(in);
float width = bimg.getWidth();
float height = bimg.getHeight();
PDPage page = new PDPage(new PDRectangle(width, height));
document.addPage(page);
PDXObjectImage img = new PDJpeg(document, new FileInputStream(someImage));
PDPageContentStream contentStream = new PDPageContentStream(document, page);
contentStream.drawImage(img, 0, 0);
contentStream.close();
in.close();
document.save("test.pdf");
document.close();
为了完整起见，PDFBox 2+ API 的当前 PDFBox 示例中的代码
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* contributor license agreements.See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
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* http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.pdfbox.examples.pdmodel;
import java.io.File;
import java.io.IOException;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.PDPageContentStream;
import org.apache.pdfbox.pdmodel.PDPageContentStream.AppendMode;
import org.apache.pdfbox.pdmodel.graphics.image.PDImageXObject;
/**
* This is an example that creates a reads a document and adds an image to it..
*
* The example is taken from the pdf file format specification.
*
* @author Ben Litchfield
*/
public class AddImageToPDF
{
/**
* Add an image to an existing PDF document.
*
* @param inputFile The input PDF to add the image to.
* @param imagePath The filename of the image to put in the PDF.
* @param outputFile The file to write to the pdf to.
*
* @throws IOException If there is an error writing the data.
*/
public void createPDFFromImage( String inputFile, String imagePath, String outputFile )
throws IOException
{
try (PDDocument doc = PDDocument.load(new File(inputFile)))
{
//we will add the image to the first page.
PDPage page = doc.getPage(0);
// createFromFile is the easiest way with an image file
// if you already have the image in a BufferedImage,
// call LosslessFactory.createFromImage() instead
PDImageXObject pdImage = PDImageXObject.createFromFile(imagePath, doc);
try (PDPageContentStream contentStream = new PDPageContentStream(doc, page, AppendMode.APPEND, true, true))
{
// contentStream.drawImage(ximage, 20, 20 );
// better method inspired by http://stackoverflow.com/a/22318681/535646
// reduce this value if the image is too large
float scale = 1f;
contentStream.drawImage(pdImage, 20, 20, pdImage.getWidth() * scale, pdImage.getHeight() * scale);
}
doc.save(outputFile);
}
}
/**
* This will load a PDF document and add a single image on it.
* <br>
* see usage() for commandline
*
* @param args Command line arguments.
*/
public static void main(String[] args) throws IOException
{
AddImageToPDF app = new AddImageToPDF();
if( args.length != 3 )
{
app.usage();
}
else
{
app.createPDFFromImage( args, args, args );
}
}
/**
* This will print out a message telling how to use this example.
*/
private void usage()
{
System.err.println( "usage: " + this.getClass().getName() + " <input-pdf> <image> <output-pdf>" );
}
}
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