1.在pom.xml文件中导入poi-tl：

 <dependency><groupId>com.deepoove</groupId><artifactId>poi-tl</artifactId><version>1.9.1</version></dependency>

2.编写测试类：

package com.mischen.mapreduce.wordcount;import com.deepoove.poi.xwpf.NiceXWPFDocument;
import org.apache.poi.util.Units;
import org.apache.poi.xwpf.usermodel.XWPFDocument;
import org.apache.poi.xwpf.usermodel.XWPFParagraph;
import org.apache.poi.xwpf.usermodel.XWPFRun;import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.util.List;/*** @ClassName TestMergeWord* @Description DOTO* @Author mischen* @Date 2021/5/13 0013 23:16* @Version 1.0**/
public class TestMergeWord {public static void main(String[] args) throws Exception{/* NiceXWPFDocument main = new NiceXWPFDocument(new FileInputStream("C:\\Users\\Administrator\\Desktop\\PMP\\pmp记忆知识点.docx"));NiceXWPFDocument sub = new NiceXWPFDocument(new FileInputStream("C:\\Users\\Administrator\\Desktop\\PMP\\zookpeer.docx"));// 合并两个文档NiceXWPFDocument newDoc = main.merge(sub);// 生成新文档FileOutputStream out = new FileOutputStream("C:\\Users\\Administrator\\Desktop\\PMP\\new_doc.docx");newDoc.write(out);newDoc.close();out.close();*/XWPFDocument doc = new XWPFDocument(new FileInputStream("C:\\Users\\Administrator\\Desktop\\PMP\\new_doc.docx"));// 段落List<XWPFParagraph> paragraphs = doc.getParagraphs();InputStream stream = new FileInputStream("C:\\Users\\Administrator\\Pictures\\Saved Pictures\\稳定就业证明模板.png");int length=paragraphs.size();XWPFRun run = paragraphs.get(length-1).createRun();run.addPicture(stream, XWPFDocument.PICTURE_TYPE_PNG, "Generated", Units.toEMU(256), Units.toEMU(256));FileOutputStream out = new FileOutputStream("C:\\Users\\Administrator\\Desktop\\PMP\\2.docx");doc.write(out);out.close();System.out.println("合并word成功！");}
}

需要注意的是，在上面的测试类中，路径下面的文档是必须真实存在的，图片也是要真实存在的，paragraphs.get(length-1).createRun()这个表示

读取最后一个段落，run.addPicture(stream, XWPFDocument.PICTURE_TYPE_PNG, "Generated", Units.toEMU(256), Units.toEMU(256)); 表示往最后一个段落

里面添加一张图片，最后将文档输出为2.docx