背景

现在有一个需求，需要将多个word文档合并为一个文档，并使用poi-el渲染模板生成一个新的文档。
在网上找了很多，没找到合适的，最后摸索出一个可行方案，基于XWPFDocument.getBodyElements方法的。
其实一开始考虑过这个方法，但当时对底层源码不熟悉，觉得无法分辨每个element的类型，比如chart对象其实是包含在XWPFParagraph对象中的，所以当时排除了这个方法。后来在网上找到了基于OPCPackage的，但是这种方法无法保证顺序，所以也排除了。最后想到了XWPFTemplate.render方法的底层源码，可以完美解决getBodyElements的类型问题，所以就使用了getBodyElements这个方案。
参考文档：https://codeleading.com/article/50704657377/

方案思路

使用XWPFDocument.getBodyElements()来获取整个doc的所有元素对象，元素对象供分为三类，分别为PARAGRAPH、TABLE、CONTENTCONTROL，其中，Picture、Chart均是包含在PARAGRAPH里的，关于这块可以参考底层代码TemplateResolver

完整代码

package word;import com.deepoove.poi.XWPFTemplate;
import com.deepoove.poi.xwpf.CTDrawingWrapper;
import org.apache.commons.collections4.CollectionUtils;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.ooxml.POIXMLDocumentPart;
import org.apache.poi.util.Units;
import org.apache.poi.xwpf.usermodel.*;
import org.openxmlformats.schemas.drawingml.x2006.chart.CTPlotArea;
import org.openxmlformats.schemas.drawingml.x2006.main.CTNonVisualDrawingProps;
import org.openxmlformats.schemas.wordprocessingml.x2006.main.*;import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;/*** 将多个word文档合并为一个word文件*/
public class CopyDoc{static String target = "C:\\Users\\huahua\\Desktop\\template.docx";static String dest = "C:\\Users\\huahua\\Desktop\\out.docx";public static List<XWPFDocument> readDoc(List<String> paths) throws Exception {List<XWPFDocument> documents = new ArrayList();for (String path : paths) {documents.add(new XWPFDocument(new FileInputStream(path)));}return documents;}public static void main(String[] args) throws Exception {List<String> paths = new ArrayList() {{add("C:\\Users\\huahua\\Desktop\\模板\\11.docx");add("C:\\Users\\huahua\\Desktop\\模板\\12.docx");add("C:\\Users\\huahua\\Desktop\\模板\\14.docx");}};List<XWPFDocument> document = readDoc(paths);insertContext(document, new ArrayList(){{add("标题1");add("标题2");add("标题3");}});renderData();}public static void renderData() throws IOException {XWPFTemplate compile = XWPFTemplate.compile(target);compile.render(new HashMap() {{put("1", "ajsdkaklsjd");put("2", "ajsdkaklsjd");put("3", "ajsdkaklsjd");}}).writeToFile(dest);}/*** 追加内容到页面** @throws IOException*/public static void insertContext(List<XWPFDocument> documents, List<String> titles) throws Exception {//模板文档XWPFDocument document1 = new XWPFDocument();XWPFDocument template = new XWPFDocument(new FileInputStream("C:\\Users\\huahua\\Desktop\\标题文档.docx"));// 获得模板文档的整体样式CTStyles wordStyles = template.getStyle();// 获取新建文档对象的样式XWPFStyles newStyles = document1.createStyles();// 关键行// 修改设置文档样式为静态块中读取到的样式newStyles.setStyles(wordStyles);int i = 1;for (XWPFDocument document : documents) {//一级标题XWPFParagraph paragraph = document1.createParagraph();paragraph.setStyle("2");XWPFRun run1 = paragraph.createRun();run1.addBreak();run1.setText(i+" ."+titles.get(i-1));Document document2 = new XWPFDocument();List<IBodyElement> bodyElements = document.getBodyElements();int chartPos = 0;for (IBodyElement element : bodyElements) {if (element.getElementType() == BodyElementType.PARAGRAPH) {XWPFParagraph sourcePara = (XWPFParagraph) element;XWPFParagraph targetParagraph = document1.createParagraph();copyPara(targetParagraph, sourcePara, document1, document, chartPos);} else if (element.getElementType() == BodyElementType.TABLE) {XWPFTable sourceTable = (XWPFTable) element;List<XWPFTableRow> rows = sourceTable.getRows();if (null == rows) continue;copyTable(sourceTable, document1);}}i++;}FileOutputStream fopts = new FileOutputStream(target);document1.write(fopts);document1.close();fopts.close();}/*** @param targetParagraph* @param sourcePara*/private static void copyPara(XWPFParagraph targetParagraph, XWPFParagraph sourcePara, XWPFDocument document, XWPFDocument srcDoc, int pos) throws Exception {//把传过来的段落中的ppr标签设置到新的段落里CTP ctp = targetParagraph.getCTP();ctp.setPPr(sourcePara.getCTPPr());List<XWPFRun> runs = sourcePara.getRuns();//获取run对象for (int k = 0; k < runs.size(); k++) {XWPFRun newRun = targetParagraph.createRun();XWPFRun oldRun = runs.get(k);CTRPr oldRPr = oldRun.getCTR().getRPr();newRun.getCTR().setRPr(oldRPr);//处理图表if (StringUtils.isBlank(oldRun.getText(0))) {CTR ctr = oldRun.getCTR();CTDrawing ctDrawing = CollectionUtils.isNotEmpty(ctr.getDrawingList()) ? ctr.getDrawingArray(0) : null;if (null == ctDrawing) continue;CTDrawingWrapper wrapper = new CTDrawingWrapper(ctDrawing);String rid = wrapper.getChartId();if (null == rid) continue;POIXMLDocumentPart documentPart = oldRun.getDocument().getRelationById(rid);if (null == documentPart || !(documentPart instanceof XWPFChart)) continue;XWPFChart chart1 = srcDoc.getCharts().get(pos);XWPFChart chart = document.createChart(newRun, 7 * Units.EMU_PER_CENTIMETER, 7 * Units.EMU_PER_CENTIMETER);CTPlotArea plotArea = chart1.getCTChart().getPlotArea();chart.getCTChart().setPlotArea(plotArea);chart.getCTChart().setLegend(chart1.getCTChart().getLegend());chart.setWorkbook(chart1.getWorkbook());CTNonVisualDrawingProps docPr = newRun.getCTR().getDrawingList().get(0).getInlineList().get(0).getDocPr();if (StringUtils.isBlank(docPr.getTitle())) {docPr.setTitle("{{test}}");}pos++;} else {newRun.setText(oldRun.getText(0));}targetParagraph.addRun(newRun);}}/*** 复制表格** @param source* @param document*/private static void copyTable(XWPFTable source, XWPFDocument document) {// 创建新的 CTTblCTTbl ctTbl = CTTbl.Factory.newInstance();// 复制原来的CTTblctTbl.set(source.getCTTbl());IBody iBody = source.getBody();XWPFTable newTable = new XWPFTable(ctTbl, iBody);document.createTable();document.setTable(document.getTables().size()-1, newTable);}
}