Question

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页面应具有与图像一样的精确尺寸因此每个页面仅包含全分辨率的图像。

如何实现这一点，将页面设置为图像/内容的尺寸？
因为我看到了具有不同页面大小和方向的PDF文件，但是如何用PDFBox完成呢？

Answer 1

我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();

为了完整性，代码构成了PDFBox 2+ API（https://svn.apache.org/repos/asf/pdfbox/trunk/examples/src/main/java/org/apache/pdfbox/examples/pdmodel/AddImageToPDF.java）的当前PDFBox示例

/*
 * 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>" );
    }
}

Java：使用PDFBox库从图像创建PDF页面

1 个答案: