Problem
需求很單純，在我們有了自動抓圖程式後，接著就是要自動取代文件圖片了。經過研究一番，目前我只有辦法去取代Word 2007的圖片，2003並沒找到相應的操作API。
How to?
在Word2007中，本文是使用XWPFDocument物件去操作，而XWPFDocument(本文)下包含了多個XWPFParagraph(段落)。XWPFParagraph包含多個XWPFRun(文字屬性描述區塊)，XWPFRun則包含CTR(Run的描述屬性)。圖片相關物件可從CTR中取出來去操作。
要達到需求，我們必須去loop本文內容，插入新圖片並刪除原本的圖片。我的範例僅僅將原本圖片大小讀出來，接著再把圖片依據這個大小插入到Word中。做法很直覺，廢話不多說，看code:
public static void main(String[] args) throws Exception {
String testFile = "testdata/test.docx";
String targetFile = "testdata/test_c.docx";
String image = "./testdata/Desert.jpg";
InputStream is = null;
OutputStream os = null;
try {
is = new FileInputStream(testFile);
os = new FileOutputStream(targetFile);
CustomXWPFDocument doc = new CustomXWPFDocument(is);
int count = 0;
for( XWPFParagraph para : doc.getParagraphs()){
List<XWPFRun> runs = para.getRuns();
for( XWPFRun run : runs ){
List<CTDrawing> drawings = run.getCTR().getDrawingList();
int size = drawings.size();
for( int i = 0 ; i < size ; i++ ){
CTPositiveSize2D ps2d = drawings.get(0).getInlineList().get(0).getExtent();
String blipId = addPictureData(image, doc);
doc.createPicture(run.getCTR(),
blipId, doc.getNextPicNameNumber(XWPFDocument.PICTURE_TYPE_PNG),
ps2d.getCx(), ps2d.getCy());
run.getCTR().removeDrawing(0);
count++;
}
}
}
doc.write(os);
System.out.println("Replace " + count + " image(s).");
} finally {
Cleaner.close(is);
Cleaner.close(os);
}
}
private static String addPictureData(String image, CustomXWPFDocument doc)
throws FileNotFoundException, InvalidFormatException {
InputStream images = null;
try {
images = new FileInputStream(image);
return doc.addPictureData(images, XWPFDocument.PICTURE_TYPE_JPEG);
} finally {
Cleaner.close(images);
}
}這裡是透過新增一筆在尾巴，接著刪除index 0那筆去做到類似替換的效果。但如果是文繞圖或特別調整的圖片，不僅僅只是讀取圖片大小，可能還要去取得設定的樣式做處理。如果之後有類似的需求我再研究並分享。
另外我繼承XWPFDocument類別去定義了CustomXWPFDocument，是由於XWPFDocument本身的createPicture存在bug，會造成輸出的Word無法正常開啟。
import java.io.IOException;
import java.io.InputStream;
import org.apache.poi.openxml4j.opc.OPCPackage;
import org.apache.poi.xwpf.usermodel.XWPFDocument;
import org.apache.xmlbeans.XmlException;
import org.apache.xmlbeans.XmlToken;
import org.openxmlformats.schemas.drawingml.x2006.main.CTNonVisualDrawingProps;
import org.openxmlformats.schemas.drawingml.x2006.main.CTPositiveSize2D;
import org.openxmlformats.schemas.drawingml.x2006.wordprocessingDrawing.CTInline;
import org.openxmlformats.schemas.wordprocessingml.x2006.main.CTR;
public class CustomXWPFDocument extends XWPFDocument {
public CustomXWPFDocument() {
super();
}
public CustomXWPFDocument(OPCPackage opcPackage) throws IOException {
super(opcPackage);
}
public CustomXWPFDocument(InputStream in) throws IOException {
super(in);
}
public void createPicture(CTR ctr, String blipId,int id, long width, long height) {
//inal int EMU = 9525;
//width *= EMU;
//height *= EMU;
//String blipId = getAllPictures().get(id).getPackageRelationship().getId();
CTInline inline = ctr.addNewDrawing().addNewInline();
String picXml = "" +
"<a:graphic xmlns:a=\"http://schemas.openxmlformats.org/drawingml/2006/main\">" +
" <a:graphicData uri=\"http://schemas.openxmlformats.org/drawingml/2006/picture\">" +
" <pic:pic xmlns:pic=\"http://schemas.openxmlformats.org/drawingml/2006/picture\">" +
" <pic:nvPicPr>" +
" <pic:cNvPr id=\"" + id + "\" name=\"Generated\"/>" +
" <pic:cNvPicPr/>" +
" </pic:nvPicPr>" +
" <pic:blipFill>" +
" <a:blip r:embed=\"" + blipId + "\" xmlns:r=\"http://schemas.openxmlformats.org/officeDocument/2006/relationships\"/>" +
" <a:stretch>" +
" <a:fillRect/>" +
" </a:stretch>" +
" </pic:blipFill>" +
" <pic:spPr>" +
" <a:xfrm>" +
" <a:off x=\"0\" y=\"0\"/>" +
" <a:ext cx=\"" + width + "\" cy=\"" + height + "\"/>" +
" </a:xfrm>" +
" <a:prstGeom prst=\"rect\">" +
" <a:avLst/>" +
" </a:prstGeom>" +
" </pic:spPr>" +
" </pic:pic>" +
" </a:graphicData>" +
"</a:graphic>";
//CTGraphicalObjectData graphicData = inline.addNewGraphic().addNewGraphicData();
XmlToken xmlToken = null;
try {
xmlToken = XmlToken.Factory.parse(picXml);
} catch(XmlException xe) {
xe.printStackTrace();
}
inline.set(xmlToken);
//graphicData.set(xmlToken);
inline.setDistT(0);
inline.setDistB(0);
inline.setDistL(0);
inline.setDistR(0);
CTPositiveSize2D extent = inline.addNewExtent();
extent.setCx(width);
extent.setCy(height);
CTNonVisualDrawingProps docPr = inline.addNewDocPr();
docPr.setId(id);
docPr.setName("Picture " + id);
docPr.setDescr("Generated");
}
public void createPicture(String blipId,int id, int width, int height) {
createPicture(createParagraph().createRun().getCTR(), blipId, id, width, height);
}
}友藏內心獨白: 熬夜好幾天非常累，偷懶減少對code的說明。
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