参考链接： 

导出MySQL数据库所有库和字段注释及相关信息为word文档——工具类

java - Apache POI - How to copy tables from one docx to another docx - Stack Overflow

领导让我研究下一个低代码平台的代码，我就想着做一个把数据库字段直接导出来的工具。百度了一份代码是分表导出的，每个表都一个单独的word，用着不方便，我就在这个基础上加了个合并word的功能。说起来还是外网的质量高，一搜就搜到了，在百度上找了半天不行。

    public static void main(String[] args) throws Exception {// 创建新的空白Word文档作为目标文件XWPFDocument mergedDoc = new XWPFDocument();// 定义需要合并的源文件路径列表String prefix = "D:\\要合并的文件夹\\";File fold = new File(prefix);File[] fs = fold.listFiles();for(File file:fs){FileInputStream fis = new FileInputStream(file);// 读取每个源文件中的内容XWPFDocument doc = new XWPFDocument(fis);copyElements(doc, mergedDoc);// 关闭输入流fis.close();}// 保存合并后的文档FileOutputStream fos = new FileOutputStream(prefix + "\\000merged.docx");mergedDoc.write(fos);fos.close();System.out.println("合并完成！");}public static void copyElements(XWPFDocument sourceDocument, XWPFDocument targetDocument) {List<IBodyElement> elements = sourceDocument.getBodyElements();for (IBodyElement element : elements) {if (element instanceof XWPFParagraph) {XWPFParagraph paragraph = (XWPFParagraph) element;copyParagraph(paragraph, targetDocument.createParagraph());} else if (element instanceof XWPFTable) {XWPFTable table = (XWPFTable) element;copyTable(table, targetDocument.createTable());}}}private static void copyTable(XWPFTable source, XWPFTable target) {target.getCTTbl().setTblPr(source.getCTTbl().getTblPr());target.getCTTbl().setTblGrid(source.getCTTbl().getTblGrid());for (int r = 0; r<source.getRows().size(); r++) {XWPFTableRow targetRow = target.createRow();XWPFTableRow row = source.getRows().get(r);targetRow.getCtRow().setTrPr(row.getCtRow().getTrPr());for (int c=0; c<row.getTableCells().size(); c++) {//newly created row has 1 cellXWPFTableCell targetCell = c==0 ? targetRow.getTableCells().get(0) : targetRow.createCell();XWPFTableCell cell = row.getTableCells().get(c);targetCell.getCTTc().setTcPr(cell.getCTTc().getTcPr());XmlCursor cursor = targetCell.getParagraphArray(0).getCTP().newCursor();for (int p = 0; p < cell.getBodyElements().size(); p++) {IBodyElement elem = cell.getBodyElements().get(p);if (elem instanceof XWPFParagraph) {XWPFParagraph targetPar = targetCell.insertNewParagraph(cursor);cursor.toNextToken();XWPFParagraph par = (XWPFParagraph) elem;copyParagraph(par, targetPar);} else if (elem instanceof XWPFTable) {XWPFTable targetTable = targetCell.insertNewTbl(cursor);XWPFTable table = (XWPFTable) elem;copyTable(table, targetTable);cursor.toNextToken();}}//newly created cell has one default paragraph we need to removetargetCell.removeParagraph(targetCell.getParagraphs().size()-1);}}//newly created table has one row by default. we need to remove the default row.target.removeRow(0);}private static void copyParagraph(XWPFParagraph source, XWPFParagraph target) {target.getCTP().setPPr(source.getCTP().getPPr());for (int i=0; i<source.getRuns().size(); i++ ) {XWPFRun run = source.getRuns().get(i);XWPFRun targetRun = target.createRun();//copy formattingtargetRun.getCTR().setRPr(run.getCTR().getRPr());//no images just copy texttargetRun.setText(run.getText(0));}}

顺便贴上我的github地址：https://github.com/gitUserMandjq/tool

在JdbcTest类里执行方法，生成效果如下