合并两个word文档，保持样式不变

一、需求说明

      例如将封面插入到word正文上方

二、导入依赖

<dependency>
   <groupId>org.apache.poi</groupId>
    <artifactId>poi</artifactId>
    <version>4.1.1</version>
</dependency>
<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi-ooxml</artifactId>
    <version>4.1.1</version>
</dependency> 
<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi-ooxml-schemas</artifactId>
    <version>4.1.1</version>
</dependency>


<dependency>
    <groupId>org.apache.xmlbeans</groupId>
     <artifactId>xmlbeans</artifactId>
     <version>3.1.0</version>
</dependency>

三、准备工作

准备两个word文档

四、代码

import java.io.File;
import java.io.FileFilter;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.poi.openxml4j.opc.OPCPackage;
import org.apache.poi.xwpf.usermodel.Document;
import org.apache.poi.xwpf.usermodel.XWPFDocument;
import org.apache.poi.xwpf.usermodel.XWPFPictureData;
import org.apache.xmlbeans.XmlOptions;
import org.openxmlformats.schemas.wordprocessingml.x2006.main.CTBody;

public class test {
    public static void main (String[] args) throws Exception {
    
    /*String[] str = {"街道(年度)","街道(季度)","街道(月度)","全区(年度)","全区(季度)","全区(月度)"};*/
    String[] str = {"街道(年度)"};
    for (int k = 0; k < str.length; k++) {
        String type = str[k];
        String path ="E:/1/确认打印报告/"+type+"/";
        File fileRoot = new File(path);
        List<File> subFileList = new ArrayList<File>();
        getAllFile(subFileList,fileRoot);
            for (File file : subFileList) {
            String name = file.getName();
            File newFile = new File("f:/final/"+type+"/"+name);
            List<File> srcfile = new ArrayList<>();
            File file1 = new File("E:/1/确认打印报告/"+type+"/"+name);
            File file2 = new File("D:/word/封面/生成/"+type+"/"+name);

            srcfile.add(file1);
            srcfile.add(file2);

            try {
                OutputStream dest = new FileOutputStream(newFile);
                ArrayList<XWPFDocument> documentList = new ArrayList<>();
                XWPFDocument doc = null;
                for (int i = 0; i < srcfile.size(); i++) {
                    FileInputStream in = new FileInputStream(srcfile.get(i).getPath());
                    OPCPackage open = OPCPackage.open(in);
                    XWPFDocument document = new XWPFDocument(open);
                    documentList.add(document);
                    in.close();
                }
                for (int i = 0; i < documentList.size(); i++) {
                    doc = documentList.get(0);
                    if(i != 0){
                        appendBody(doc,documentList.get(i));
                    }
                }
//                doc.createParagraph().setPageBreak(true);
                doc.write(dest);
                System.out.println(name);
                doc.close();
                dest.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
            }
    }
    
    }

    public static void appendBody(XWPFDocument src, XWPFDocument append) throws Exception {
        CTBody src1Body = src.getDocument().getBody();
        CTBody src2Body = append.getDocument().getBody();

        List<XWPFPictureData> allPictures = append.getAllPictures();
        // 记录图片合并前及合并后的ID
        Map<String,String> map = new HashMap();
        for (XWPFPictureData picture : allPictures) {
            String before = append.getRelationId(picture);
            //将原文档中的图片加入到目标文档中
            String after = src.addPictureData(picture.getData(), Document.PICTURE_TYPE_PNG);
            map.put(before, after);
        }

        appendBody(src1Body, src2Body,null);

    }

    private static void appendBody(CTBody src, CTBody append,Map<String,String> map) throws Exception {
        XmlOptions optionsOuter = new XmlOptions();
        optionsOuter.setSaveOuter();
        String appendString = append.xmlText(optionsOuter);

        String srcString = src.xmlText();
        String prefix = srcString.substring(0,srcString.indexOf(">")+1);
        String mainPart = srcString.substring(srcString.indexOf(">")+1,srcString.lastIndexOf("<"));
        String sufix = srcString.substring( srcString.lastIndexOf("<") );
        String addPart = appendString.substring(appendString.indexOf(">") + 1, appendString.lastIndexOf("<"));

        if (map != null && !map.isEmpty()) {
            //对xml字符串中图片ID进行替换
            for (Map.Entry<String, String> set : map.entrySet()) {
                addPart = addPart.replace(set.getKey(), set.getValue());
            }
        }
        //将两个文档的xml内容进行拼接
        CTBody makeBody = CTBody.Factory.parse(prefix+addPart+mainPart+sufix);

        src.set(makeBody);
    }
    

  
    private static void getAllFile(final List<File> subFileList, File fileRoot) {
        fileRoot.listFiles(new FileFilter() {
            @Override
            public boolean accept(File file) {
                if (file.isDirectory()) {
                    getAllFile(subFileList, file);
                    return false;
                }else{
                    if(file.getName().endsWith(".docx")){
                        subFileList.add(file);
                    }
                    return false;
                }
            }
        });
    }
}