Question

@JasonPlutext，

嗨，杰森！我尝试了上面的代码，但它只是完全替换了图像，删除了整个模板。

我只想替换/添加图像的特定关系，例如

omnetpp

我要替换rId8图像代替rId8。

我的源代码：

 <Relationship Id="rId8" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/image" Target="../media/image10.png"/>

请帮助我如何替换生成的PPT中的图像。

谨此问候，萨拉尼

Answer 1

请参见https://github.com/plutext/docx4j/blob/master/src/samples/pptx4j/org/pptx4j/samples/TemplateReplaceSimple.java（刚刚添加）：

package org.pptx4j.samples;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

import javax.xml.bind.JAXBException;

import org.apache.commons.io.FileUtils;
import org.docx4j.TraversalUtil;
import org.docx4j.TraversalUtil.CallbackImpl;
import org.docx4j.dml.CTBlip;
import org.docx4j.dml.CTBlipFillProperties;
import org.docx4j.openpackaging.exceptions.Docx4JException;
import org.docx4j.openpackaging.packages.OpcPackage;
import org.docx4j.openpackaging.packages.PresentationMLPackage;
import org.docx4j.openpackaging.parts.Part;
import org.docx4j.openpackaging.parts.PresentationML.SlidePart;
import org.docx4j.openpackaging.parts.WordprocessingML.BinaryPartAbstractImage;
import org.pptx4j.Pptx4jException;

/**
 * Example of how to replace text and images in a Pptx.
 * 
 * Text is replaced using the familiar VariableReplace approach.
 * 
 * Images are replaced by replacing their byte content.
 * 
 * @author jharrop
 *
 */
public class TemplateReplaceSimple {

    public static void main(String[] args) throws Docx4JException, Pptx4jException, JAXBException, IOException {

        // Input file
        String inputfilepath = System.getProperty("user.dir") + "/sample-docs/pptx/image.pptx";

        // String replacements
        HashMap<String, String> mappings = new HashMap<String, String>();
        mappings.put("colour", "green");

        // Image replacements
        List<ImageReplacementDetails>  imageReplacements = new ArrayList<ImageReplacementDetails>();

        ImageReplacementDetails example1 = new ImageReplacementDetails();
        example1.slideIndex = 0;
        example1.imageRelId = "rId2";
        example1.replacementImageBytes = FileUtils.readFileToByteArray(new File("test.png"));
        imageReplacements.add(example1);



        PresentationMLPackage presentationMLPackage = 
                (PresentationMLPackage)OpcPackage.load(new java.io.File(inputfilepath));


        // First, the text replacements
        List<SlidePart> slideParts= 
                presentationMLPackage.getMainPresentationPart().getSlideParts();
        for (SlidePart slidePart : slideParts) {

            slidePart.variableReplace(mappings);
        }


        // Second, the image replacements.
        // We have a design choice here.  
        // Either we can replace text placeholders with images,
        // or we can replace existing images with new images, but keep the XML specifying size etc
        // Here I opt for the latter, so what we need is the relId and image bytes.
        for( ImageReplacementDetails ird : imageReplacements) {

            // its a bit inefficient to potentially traverse a single slide
            // multiple times, but I've done it this way to keep this example simple
            SlidePart slidePart= 
                    presentationMLPackage.getMainPresentationPart().getSlide(ird.slideIndex);

            SlidePicFinder traverser = new SlidePicFinder();
            new TraversalUtil(slidePart.getJaxbElement().getCSld().getSpTree().getSpOrGrpSpOrGraphicFrame(), traverser);

            for(org.pptx4j.pml.Pic pic : traverser.pics) {

                CTBlipFillProperties  blipFill = pic.getBlipFill();
                if (blipFill!=null) {
                    CTBlip blip = blipFill.getBlip();
                    if (blip.getEmbed()!=null) {
                        String relId = blip.getEmbed();

                        // is this the one we want?
                        if (relId.equals(ird.imageRelId)) {
                            Part part = slidePart.getRelationshipsPart().getPart(relId);
                            try {
                                BinaryPartAbstractImage imagePart = (BinaryPartAbstractImage)part;
                                // you'll need to ensure that you replace like with like,
                                // ie png for png, not eg jpeg for png!
                                imagePart.setBinaryData(ird.replacementImageBytes);
                            } catch (ClassCastException cce) {
                                System.out.println(part.getClass().getName());
                            }
                        } else {
                            System.out.println(relId + " isn't a match for this replacement. ");                            
                        }
                    } else {
                        System.out.println("No a:blip/@r:embed");
                    }
                }
            }
        }

        System.out.println("\n\n saving .. \n\n");
        String outputfilepath = System.getProperty("user.dir") + "/OUT_VariableReplace.pptx";
        presentationMLPackage.save(new java.io.File(outputfilepath));

        System.out.println("\n\n done .. \n\n");


    }

    static class ImageReplacementDetails {

        int slideIndex;

        String imageRelId;

        byte[] replacementImageBytes;

    }


    static class SlidePicFinder extends CallbackImpl {

        List<org.pptx4j.pml.Pic> pics = new ArrayList<org.pptx4j.pml.Pic>();

        public List<Object> apply(Object o) {

            if (o instanceof org.pptx4j.pml.Pic) {
                pics.add((org.pptx4j.pml.Pic) o);
                System.out.println("added pic");
            }
            return null;
        }

    }


    }

使用PPTX4j在生成的PPT内的占位符中替换图像

1 个答案: