1.pom

<!--pdfbox-->
<dependency>
    <groupId>org.apache.pdfbox</groupId>
    <artifactId>pdfbox-tools</artifactId>
    <version>2.0.25</version>
</dependency>
<dependency>
    <groupId>net.sf.cssbox</groupId>
    <artifactId>pdf2dom</artifactId>
    <version>2.0.1</version>
</dependency>

<!--poi-->
<dependency>
    <groupId>com.itextpdf</groupId>
    <artifactId>itextpdf</artifactId>
    <version>5.5.10</version>
</dependency>
<dependency>
    <groupId>com.itextpdf.tool</groupId>
    <artifactId>xmlworker</artifactId>
    <version>5.5.10</version>
</dependency>
<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi-ooxml</artifactId>
    <version>3.15</version>
</dependency>
<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi-scratchpad</artifactId>
    <version>3.15</version>
</dependency>

2.实现方法

/**from fhadmin.cn
 * 指定页码插入页
 * @param filename1  源pdf路径
 * @param filename2  需要插入的pdf路径
 * @param number     插入的页码
 * @param newfilename   全新pdf的路径
 * @throws Exception
 */
public void insertPage(String filename1,String filename2,int number,String newfilename,String tempPath) throws Exception {
    PDDocument pdf1 = PDDocument.load(new File(filename1));
    PDDocument pdf2 = PDDocument.load(new File(filename2));

    //1、将第一个pdf按页码全部拆开
    Splitter splitter = new Splitter();
    List<PDDocument> Pages = splitter.split(pdf1);

    Iterator<PDDocument> iterator = Pages.listIterator();

    PDFMergerUtility PDFmerger = new PDFMergerUtility();

    int i = 1;
    while(iterator.hasNext()) {
        if(i==number){
            System.out.println("当前插入页码："+number);
            pdf2.save(tempPath+"/"+ i +".pdf");
            i++;
        }
        PDDocument pd = iterator.next();
        String tempFile = tempPath+"/"+ i +".pdf";
        System.out.println("开始拆分:"+tempFile);
        pd.save(tempFile);
        i++;
    }

    //2、开始重组
    PDFmerger.setDestinationFileName(newfilename);

    //上面的i最后多加了一次，这里不取等
    for(int j=1;j<i;j++){
        String tempFile = tempPath+"/"+ j +".pdf";
        System.out.println("开始合并:"+tempFile);
        PDFmerger.addSource(tempFile);
    }

    //合并文档
    PDFmerger.mergeDocuments();
    System.out.println("文档合并完成");

    pdf1.close();
    pdf2.close();
}

3.测试
//from fhadmin.cn
@Test
void insertPage() throws Exception {
    PdfUtils pdfUtils = new PdfUtils();
    String filename1 = "F:\\Users\\admin\\Desktop\\A.pdf";
    String filename2 = "F:\\Users\\admin\\Desktop\\B.pdf";
    String newfilename = "F:\\Users\\admin\\Desktop\\newA.pdf";
    String tempPath = "F:\\Users\\admin\\Desktop\\temp";
    int insertNum = 32;

    pdfUtils.insertPage(filename1,filename2,insertNum,newfilename,tempPath);
}
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