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();
复制代码
为了完整起见,PDFBox 2+ API 的当前 PDFBox 示例中的代码
- /*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * 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
- * (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
- 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[0], args[1], args[2] );
- }
- }
- /**
- * 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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