Java 生成各种 PDF 实战方案（图片、模板、表格）

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本篇文章的重点还是在讲通过java生成pdf，其实如果是单纯的模板填充挺简单的，但是又要填充模板还要动态生成表格就比较麻烦了，因为如果在模板中画表格的框去生成的话，超过模板框的位置就会隐藏，我刚接到需求的时候也是有点难受，在网上也是找了大量的资料，研究了半天，发现好多都是你粘贴我，我粘贴你，最终我也算是搞成了，把这些整合一下，让大家用的好用一些，废话不多说，直接上代码！

这里说一下啊，如果需要生成echarts图片，先去看我的生成echarts图片文章，不然这个搞不了。

模板链接，已经放到公众号后台，需要可以去公众号后台回复【PDF】获取：

后台回复【PDF】

1

pom依赖

首先先引入咱们需要的pom依赖，我这里只粘贴pdf的吧，lombok和hutool经常用我就不粘贴了。

<dependency>
  <groupId>com.itextpdf</groupId>
      <artifactId>itextpdf</artifactId>
      <version>5.5.9</version>
  </dependency>
  <dependency>
      <groupId>com.itextpdf</groupId>
      <artifactId>itext-asian</artifactId>
      <version>5.2.0</version> 
</dependency>

2

生成pdf，模板和图片及动态生成表格

我这个没有搞页眉，只搞了页脚，设置页眉/页脚和水印的类我会在最后粘贴出来，因为这几个案例用的都是一个配置类。

实体类

@Data
@Accessors(chain = true)
public class DuizhangDomain {
    private String jg;
    private Integer ydz;
    private Integer wdz;
    private BigDecimal dzl;
}

@Data
@Accessors(chain = true)
public class YqTable implements Serializable {
    private String jg;
    private Integer yqs;
}

生成pdf代码

/**
 * 根据模板填充数据及图片，动态生成数据列表
 */
public class CreatePdfEchrtsAndTableMain2 {

    private final static String TITLE = "这个是标题，可有可无";
    public void createPdfFile(HttpServletResponse response) throws IOException, DocumentException, TemplateException {
        //设置请求返回类型
        response.setHeader("Content-Disposition", "attachment; filename=测试.pdf");
        OutputStream outputStream = response.getOutputStream();
        //模板路径，放到项目里用这个ClassPathResource
        ClassPathResource classPathResource = new ClassPathResource("templates/test1.pdf");
        InputStream inputStream = classPathResource.getInputStream();

        PdfReader reader = new PdfReader(inputStream);
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        PdfStamper ps = new PdfStamper(reader, bos);

        //设置字体
        final BaseFont font = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
        ArrayList<BaseFont> fontList = new ArrayList<>();
        fontList.add(font);

        //提取表单,这个是模板画好的文本框
        AcroFields s = ps.getAcroFields();
        s.setSubstitutionFonts(fontList);

        s.setFieldProperty("jrfk","textfont",font,null);
        s.setFieldProperty("bjzs","textfont",font,null);
        s.setFieldProperty("type","textfont",font,null);
        s.setFieldProperty("createTime","textfont",font,null);
        s.setFieldProperty("title","textfont",font,null);
        s.setField("jrfk","10");
        s.setField("bjzs","20");
        s.setField("type","日报");
        s.setField("createTime", DateUtil.now());
        s.setField("title", TITLE);



        //添加图片
        PdfContentByte cb = ps.getOverContent(1);
        //添加logo
        Rectangle logo = s.getFieldPositions("logo").get(0).position;
        Image logoImage = Image.getInstance("https://img1.baidu.com/it/u=3646261857,3326755268&fm=253&app=138&size=w931&n=0&f=JPG&fmt=auto?sec=1668186000&t=20050fc88fc3feb1f9d28392f4595ec6");
        //根据域的大小缩放图片，我这里宽度在原有的域基础上加了100，你们可以自己调节
        logoImage.scaleToFit(logo.getWidth() + 100,logo.getHeight());
        logoImage.setAlignment(Image.MIDDLE);
        logoImage.setAbsolutePosition(logo.getLeft(),logo.getBottom());
        cb.addImage(logoImage);

        //获取统计图
        //获取域
        Rectangle rlt = s.getFieldPositions("rlt").get(0).position;
        //热力图
        Image rltImage = Image.getInstance("https://img0.baidu.com/it/u=4043177345,1055141017&fm=253&app=138&size=w931&n=0&f=PNG&fmt=auto?sec=1668186000&t=8cfdc5c95cc0070eb91946d780ee8dc3");
        //根据域大小设置缩放图片
        rltImage.scaleToFit(rlt.getWidth() + 100,rlt.getHeight());
        // 设置居中
        rltImage.setAlignment(Image.MIDDLE);
        //绝对定位
        rltImage.setAbsolutePosition(rlt.getLeft(),rlt.getBottom());
        //图片旋转，这个可以将图片进行一个旋转，看自己需求
// rltImage.setRotationDegrees(90);
        cb.addImage(rltImage);


        //按机构统计图
       //这个是生成echarts的类，如果需要生成echarts可以去看我的另一个文章，上面前言已经提到了
        App app1 = new App();
        byte[] echarts1 = app1.createEcharts("ajg.ftl");
        Image ajgImage = Image.getInstance(echarts1);
        Rectangle ajg = s.getFieldPositions("ajg").get(0).position;
        // 根据域大小设置缩放图片
        ajgImage.scaleToFit(ajg.getWidth(),400);
        // 设置居中
        ajgImage.setAlignment(Image.MIDDLE);
        // 绝对定位
        ajgImage.setAbsolutePosition(ajg.getLeft(),ajg.getBottom());
        cb.addImage(ajgImage);
        //按机构排名，这个是在图片的基础上还要添加数据，这个模板可以画好
        for (int i = 1; i <= 3; i++) {
            s.setFieldProperty("ajg" + i,"textfont",font,null);
            s.setField("ajg" + i,"机构" + i);
        }
        App app = new App();
        byte[] echarts = app.createEcharts("option.ftl");
        //按业务
        Rectangle ayw = s.getFieldPositions("ayw").get(0).position;
        Image aywImage = Image.getInstance(echarts);
        // 设根据域大小设置缩放图片
        aywImage.scaleToFit(ayw.getWidth(), 400);
        // 设置居中
        aywImage.setAlignment(Image.MIDDLE);
        // 绝对定位
        aywImage.setAbsolutePosition(ayw.getLeft(),ayw.getBottom());
        cb.addImage(aywImage);
        //按业务排名
        for (int i = 1; i <= 3; i++) {
            s.setFieldProperty("ayw" + i,"textfont",font,null);
            s.setField("ayw" + i,"机构" + i);
        }

        //按场合
        Rectangle acj = s.getFieldPositions("acj").get(0).position;
        Image acjImage = Image.getInstance(echarts);
        // 设根据域大小设置缩放图片
        acjImage.scaleToFit(acj.getWidth(), 400);
        // 设置居中
        acjImage.setAlignment(Image.MIDDLE);
        // 绝对定位
        acjImage.setAbsolutePosition(acj.getLeft(),acj.getBottom());
        cb.addImage(acjImage);
        //按场景排名
        for (int i = 1; i <= 3; i++) {
            s.setFieldProperty("acj" + i,"textfont",font,null);
            s.setField("acj" + i,"机构" + i);
        }

        //按等级
        Rectangle adj = s.getFieldPositions("adj").get(0).position;
        Image adjImage = Image.getInstance(echarts);
        // 设根据域大小设置缩放图片
        adjImage.scaleToFit(adj.getWidth(),400);
        // 设置居中
        adjImage.setAlignment(Image.MIDDLE);

        // 绝对定位
        adjImage.setAbsolutePosition(adj.getLeft(),adj.getBottom());
        cb.addImage(adjImage);
        //按场景排名
        for (int i = 1; i <= 3; i++) {
            s.setFieldProperty("adj" + i,"textfont",font,null);
            s.setField("adj" + i,"机构" + i);
        }
        ps.setFormFlattening(true);
        ps.close();

        //*******************填充编辑好后的pdf**************
        reader = new PdfReader(bos.toByteArray());
        Rectangle pageSize = reader.getPageSize(1);
        Document document = new Document(pageSize);
        PdfWriter writer = PdfWriter.getInstance(document, outputStream);
        writer.setPageEvent(new PageEvent());
        // 打开文档
        document.open();
        PdfContentByte cbUnder = writer.getDirectContentUnder();
        PdfImportedPage pageTemplate = writer.getImportedPage(reader, 1);
        cbUnder.addTemplate(pageTemplate, 0, 0);
        //重新开一页面
        document.newPage();
        createTable(writer,document);
// document.newPage();
        createTableYq(writer,document);
        document.close();
        outputStream.close();
    }

    //为一个表格添加内容
    public PdfPCell createSetCell(String value,Font font){
        PdfPCell cell = new PdfPCell();
        cell.setPhrase(new Phrase(value,font));
        cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
        cell.setHorizontalAlignment(Element.ALIGN_CENTER);
        return cell;
    }


    //添加表格
    public void createTable(PdfWriter writer,Document document) throws DocumentException, IOException {

        PdfPTable table = new PdfPTable(new float[] { 30, 80, 50, 50, 50});
        table.setTotalWidth(520);
        table.setPaddingTop(500);
        table.setLockedWidth(true);
        table.setHorizontalAlignment(Element.ALIGN_CENTER);//居中
        table.writeSelectedRows(0, -1,500,800,writer.getDirectContentUnder());
        //每页都显示表头,输入几就是第几行的表头固定
        table.setHeaderRows(2);
        table.setHeaderRows(3);

        //定义数据的字体
        BaseFont baseFont = BaseFont.createFont("STSong-Light","UniGB-UCS2-H",BaseFont.NOT_EMBEDDED);
        Font textFont = new Font(baseFont, 10, Font.NORMAL);
        PdfPCell cell = new PdfPCell(new Paragraph(" ", textFont));

        cell.setHorizontalAlignment( Element.ALIGN_LEFT);

        cell.setVerticalAlignment(Element.ALIGN_BOTTOM);

        cell.setBorder(Rectangle.NO_BORDER);

        cell.setColspan(5);

        table.addCell(cell);

        //表头信息
        PdfPCell heandCell = new PdfPCell();
        heandCell.setRowspan(1);
        heandCell.setColspan(5);
        heandCell.setFixedHeight(60);
        heandCell.setVerticalAlignment(Element.ALIGN_MIDDLE);
        heandCell.setHorizontalAlignment(Element.ALIGN_CENTER);
        heandCell.setPhrase(new Phrase(TITLE + "对账情况表",textFont));
        table.addCell(heandCell);

        //表字段
        String title[] = {"序号","机构","已对账","未对账","对账率%"};
        for (int i = 0; i < title.length; i++) {
            PdfPCell heardCell = new PdfPCell();
            heardCell.setVerticalAlignment(Element.ALIGN_MIDDLE);
            heardCell.setHorizontalAlignment(Element.ALIGN_CENTER);
            heardCell.setPhrase(new Phrase(title[i], textFont));
            heardCell.setMinimumHeight(20);
            table.addCell(heardCell);
        }

        //列表数据

        List<DuizhangDomain> duizhangDomains = new ArrayList<>();
        for (int i = 1; i <= 1000; i++) {
            DuizhangDomain duizhangDomain = new DuizhangDomain();
            duizhangDomain.setJg("机构" + i).setYdz(i).setWdz(i).setDzl(new BigDecimal(i));
            duizhangDomains.add(duizhangDomain);
        }

        for (int i = 0; i < duizhangDomains.size(); i++) {
            PdfPCell setCell1 = createSetCell((i + 1) + "", textFont);
            PdfPCell setCell2 = createSetCell(duizhangDomains.get(i).getJg(), textFont);
            PdfPCell setCell3 = createSetCell(duizhangDomains.get(i).getYdz().toString(), textFont);
            PdfPCell setCell4 = createSetCell(duizhangDomains.get(i).getWdz().toString(), textFont);
            PdfPCell setCell5 = createSetCell(duizhangDomains.get(i).getDzl() + "%", textFont);
            table.addCell(setCell1);
            table.addCell(setCell2);
            table.addCell(setCell3);
            table.addCell(setCell4);
            table.addCell(setCell5);
        }
        document.add(table);
    }


    public void createTableYq(PdfWriter writer,Document document) throws DocumentException, IOException {

        PdfPTable table = new PdfPTable(new float[] {80, 50});
        table.setTotalWidth(520);
        table.setPaddingTop(500);
        table.setLockedWidth(true);
        table.setHorizontalAlignment(Element.ALIGN_CENTER);//居中
        table.writeSelectedRows(0, -1,500,800,writer.getDirectContentUnder());
        //每页都显示表头,输入几就是第几行的表头固定
        table.setHeaderRows(2);
        table.setHeaderRows(3);

        //定义数据的字体
        BaseFont baseFont = BaseFont.createFont("STSong-Light","UniGB-UCS2-H",BaseFont.NOT_EMBEDDED);
        Font textFont = new Font(baseFont, 10, Font.NORMAL);
        
        //这个是为了区分两个表格加的一个间隔，可以去掉
        PdfPCell cell = new PdfPCell(new Paragraph(" ", textFont));
        cell.setHorizontalAlignment( Element.ALIGN_LEFT);
        cell.setVerticalAlignment(Element.ALIGN_BOTTOM);
        cell.setBorder(Rectangle.NO_BORDER);
        cell.setColspan(2);
        table.addCell(cell);

        //表头信息
        PdfPCell heandCell = new PdfPCell();
        heandCell.setRowspan(1);
        heandCell.setColspan(2);
        heandCell.setFixedHeight(60);
        heandCell.setVerticalAlignment(Element.ALIGN_MIDDLE);
        heandCell.setHorizontalAlignment(Element.ALIGN_CENTER);
        heandCell.setPhrase(new Phrase(TITLE + "逾期表",textFont));
        table.addCell(heandCell);

        //表字段
        String title[] = {"机构名称","逾期数"};
        for (int i = 0; i < title.length; i++) {
            PdfPCell heardCell = new PdfPCell();
            heardCell.setVerticalAlignment(Element.ALIGN_MIDDLE);
            heardCell.setHorizontalAlignment(Element.ALIGN_CENTER);
            heardCell.setPhrase(new Phrase(title[i], textFont));
            heardCell.setMinimumHeight(20);
            table.addCell(heardCell);
        }

        //列表数据

        List<YqTable> yqTables = new ArrayList<>();
        for (int i = 1; i <= 1000; i++) {
            YqTable yq = new YqTable();
            yq.setJg("逾期机构" + i).setYqs(i);
            yqTables.add(yq);
        }

        for (int i = 0; i < yqTables.size(); i++) {
            PdfPCell setCell2 = createSetCell(yqTables.get(i).getJg(), textFont);
            PdfPCell setCell3 = createSetCell(yqTables.get(i).getYqs().toString(), textFont);
            table.addCell(setCell2);
            table.addCell(setCell3);
        }
        document.add(table);
    }
}

我说一下这个生成pdf需要注意的点，可能有的朋友很疑惑为什么要调用document.newPage(); 新开一页，这个是因为，如果你不新开一页的话会导致你动态生成的表格会跟模板内容重叠，注意是重叠而不是覆盖！！！

新开一页的话，就相当于我在第二页开始动态生成表格，这个时候可能有朋友就要问了，那如果我的模板没有占到一页怎么办，这样第一页岂不是会有空白，这个问题我也想到了，因为我的需求是生成好几种不同的pdf，下面我会把这种情况如何生成的代码放出来，我们先看一下第一种生成出来后的结果，我测的数据比较多，就粘几个结果好了。

生成结果示例

这就是结果！！！！基本上还可以

3

生成pdf，模板和动态表格

实体类都是一样的没有变。

生成pdf代码

/**
 * 模板第一页不占满，生成表格
 */
public class CreatePdfEchrtsAndTableMain3 {

    public void createPdfFile(HttpServletResponse response) throws IOException, DocumentException, TemplateException {
        //设置请求返回类型
        response.setHeader("Content-Disposition", "attachment; filename=测试.pdf");
        OutputStream outputStream = response.getOutputStream();
        //模板路径，放到项目里用这个ClassPathResource
        ClassPathResource classPathResource = new ClassPathResource("templates/test3.pdf");
        InputStream inputStream = classPathResource.getInputStream();

        PdfReader reader = new PdfReader(inputStream);
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        PdfStamper ps = new PdfStamper(reader, bos);

        //设置字体
        final BaseFont font = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
        ArrayList<BaseFont> fontList = new ArrayList<>();
        fontList.add(font);

        //提取表单
        AcroFields s = ps.getAcroFields();
        s.setSubstitutionFonts(fontList);

        s.setFieldProperty("type", "textfont", font, null);
        s.setFieldProperty("createTime", "textfont", font, null);
        s.setFieldProperty("title", "textfont", font, null);
        s.setField("type", "日报");
        s.setField("createTime", DateUtil.now());
        s.setField("title", "这是title，模板画的位置框");
        ps.setFormFlattening(true);
        ps.close();

        //*******************填充编辑好后的pdf**************
        reader = new PdfReader(bos.toByteArray());
        Rectangle pageSize = reader.getPageSize(1);
        Document document = new Document(pageSize);
        PdfWriter writer = PdfWriter.getInstance(document, outputStream);
        writer.setPageEvent(new PageEvent());
        // 打开文档
        document.open();
        PdfContentByte cbUnder = writer.getDirectContentUnder();
        PdfImportedPage pageTemplate = writer.getImportedPage(reader, 1);
        cbUnder.addTemplate(pageTemplate, 0, 0);
        //添加间隙,这里为进行了一个封装，因为这个模板第一页只有一些title啥的，
        //重开一页太浪费，只需要确定表格要在什么位置生成，添加一个间隙就可以了
        createBlankTable(writer, document, font, 180);

        createTable(writer, document);

        createBlankTable(writer, document, font, 20);
        createTableYq(writer, document);
        document.close();
        outputStream.close();
    }

    //为一个表格添加内容
    public PdfPCell createSetCell(String value, Font font) {
        PdfPCell cell = new PdfPCell();
        cell.setPhrase(new Phrase(value, font));
        cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
        cell.setHorizontalAlignment(Element.ALIGN_CENTER);
        return cell;
    }


    //添加表格
    public void createTable(PdfWriter writer, Document document) throws DocumentException, IOException {

        PdfPTable table = new PdfPTable(new float[]{30, 80, 50, 50, 50});
        table.setTotalWidth(520);
        table.setPaddingTop(500);
        table.setLockedWidth(true);
        table.setHorizontalAlignment(Element.ALIGN_CENTER);//居中
        table.writeSelectedRows(0, -1, 500, 800, writer.getDirectContentUnder());
        //每页都显示表头,输入几就是第几行的表头固定
        table.setHeaderRows(1);
        table.setHeaderRows(2);

        //定义数据的字体
        BaseFont baseFont = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
        Font textFont = new Font(baseFont, 10, Font.NORMAL);

        //表头信息
        PdfPCell heandCell = new PdfPCell();
        heandCell.setRowspan(1);
        heandCell.setColspan(5);
        heandCell.setFixedHeight(30);
        heandCell.setVerticalAlignment(Element.ALIGN_MIDDLE);
        heandCell.setHorizontalAlignment(Element.ALIGN_CENTER);
        heandCell.setPhrase(new Phrase("对账情况表", textFont));
        table.addCell(heandCell);

        //表字段
        String title[] = {"序号", "机构", "已对账", "未对账", "对账率%"};
        for (int i = 0; i < title.length; i++) {
            PdfPCell heardCell = new PdfPCell();
            heardCell.setRowspan(1);
            heardCell.setVerticalAlignment(Element.ALIGN_MIDDLE);
            heardCell.setHorizontalAlignment(Element.ALIGN_CENTER);
            heardCell.setPhrase(new Phrase(title[i], textFont));
            heardCell.setMinimumHeight(20);
            table.addCell(heardCell);

        }


        //列表数据

        List<DuizhangDomain> duizhangDomains = new ArrayList<>();
        for (int i = 1; i <= 1000; i++) {
            DuizhangDomain duizhangDomain = new DuizhangDomain();
            duizhangDomain.setJg("机构" + i).setYdz(i).setWdz(i).setDzl(new BigDecimal(i));
            duizhangDomains.add(duizhangDomain);
        }

        for (int i = 0; i < duizhangDomains.size(); i++) {
            PdfPCell setCell1 = createSetCell((i + 1) + "", textFont);
            PdfPCell setCell2 = createSetCell(duizhangDomains.get(i).getJg(), textFont);
            PdfPCell setCell3 = createSetCell(duizhangDomains.get(i).getYdz().toString(), textFont);
            PdfPCell setCell4 = createSetCell(duizhangDomains.get(i).getWdz().toString(), textFont);
            PdfPCell setCell5 = createSetCell(duizhangDomains.get(i).getDzl() + "%", textFont);
            table.addCell(setCell1);
            table.addCell(setCell2);
            table.addCell(setCell3);
            table.addCell(setCell4);
            table.addCell(setCell5);
        }
        document.add(table);
    }


    public void createTableYq(PdfWriter writer, Document document) throws DocumentException, IOException {

        PdfPTable table = new PdfPTable(new float[]{80, 50});
        table.setTotalWidth(520);
        table.setPaddingTop(500);
        table.setLockedWidth(true);
        table.setHorizontalAlignment(Element.ALIGN_CENTER);//居中
        table.writeSelectedRows(0, -1, 500, 800, writer.getDirectContentUnder());
        //每页都显示表头,输入几就是第几行的表头固定
        table.setHeaderRows(2);
        table.setHeaderRows(3);

        //定义数据的字体
        BaseFont baseFont = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
        Font textFont = new Font(baseFont, 10, Font.NORMAL);

        //表头信息
        PdfPCell heandCell = new PdfPCell();
        heandCell.setRowspan(1);
        heandCell.setColspan(2);
        heandCell.setFixedHeight(30);
        heandCell.setVerticalAlignment(Element.ALIGN_MIDDLE);
        heandCell.setHorizontalAlignment(Element.ALIGN_CENTER);
        heandCell.setPhrase(new Phrase("逾期表", textFont));
        table.addCell(heandCell);

        //表字段
        String title[] = {"机构名称", "逾期数"};
        for (int i = 0; i < title.length; i++) {
            PdfPCell heardCell = new PdfPCell();
            heardCell.setVerticalAlignment(Element.ALIGN_MIDDLE);
            heardCell.setHorizontalAlignment(Element.ALIGN_CENTER);
            heardCell.setPhrase(new Phrase(title[i], textFont));
            heardCell.setMinimumHeight(20);
            table.addCell(heardCell);
        }

        //列表数据

        List<YqTable> yqTables = new ArrayList<>();
        for (int i = 1; i <= 1000; i++) {
            YqTable yq = new YqTable();
            yq.setJg("逾期机构" + i).setYqs(i);
            yqTables.add(yq);
        }

        for (int i = 0; i < yqTables.size(); i++) {
            PdfPCell setCell2 = createSetCell(yqTables.get(i).getJg(), textFont);
            PdfPCell setCell3 = createSetCell(yqTables.get(i).getYqs().toString(), textFont);
            table.addCell(setCell2);
            table.addCell(setCell3);
        }
        document.add(table);
    }

    /**
     * 创建表格跟表格之间的空白间隔
     */
    public void createBlankTable(PdfWriter writer, Document document, BaseFont font, int height) throws DocumentException {
        PdfPTable table = new PdfPTable(new float[]{30});
        table.setTotalWidth(520);
        table.setPaddingTop(500);
        table.setLockedWidth(true);
        table.setHorizontalAlignment(Element.ALIGN_CENTER);//居中
        table.writeSelectedRows(0, -1, 500, 800, writer.getDirectContentUnder());
        Font textFont = new Font(font, 10, Font.NORMAL);
        PdfPCell cell = new PdfPCell(new Paragraph(" ", textFont));

        cell.setHorizontalAlignment(Element.ALIGN_LEFT);

        cell.setVerticalAlignment(Element.ALIGN_BOTTOM);

        cell.setBorder(Rectangle.NO_BORDER);
        cell.setFixedHeight(height);

        cell.setColspan(1);

        table.addCell(cell);
        document.add(table);
    }
}

这是第二种生成pdf的方法，生成的结果不一样，因为模板第一页没有太多的东西，所以会空出来很多空白，这个时候生成动态表格如果重开一页比较浪费，而且客户看着也不好看，所以我封装了一下生成间隙的方法，直接用间隙把模板内容和表格隔开即可，看一下效果。

生成结果示例

可以看到，我们在代码中并没有新开一页，只是加了一个间隙，就可以保证动态生成的表格和模板在一个页面，就此，基本上就算完成了。

页眉/页脚和水印类

public class PageEvent extends PdfPageEventHelper {
    /**
     * 页眉
     */
    //public String header = "itext测试页眉";

    /**
     * 文档字体大小，页脚页眉最好和文本大小一致
     */
    public int presentFontSize = 10;

    /**
     * 文档页面大小，最好前面传入，否则默认为A4纸张
     */
    public Rectangle pageSize = PageSize.A4;

    // 模板
    public PdfTemplate total;

    // 基础字体对象
    public BaseFont bf = null;

    // 利用基础字体生成的字体对象，一般用于生成中文文字
    public Font fontDetail = null;


    /**
     *
     * Creates a new instance of PdfReportM1HeaderFooter 无参构造方法.
     *
     */
    public PageEvent() {

    }

    /**
     *
     * Creates a new instance of PdfReportM1HeaderFooter 构造方法.
     *
     * @param
     *
     * @param presentFontSize
     * 数据体字体大小
     * @param pageSize
     * 页面文档大小，A4，A5，A6横转翻转等Rectangle对象
     */
// public PDFBuilder(String yeMei, int presentFontSize, Rectangle pageSize) {
// this.header = yeMei;
// this.presentFontSize = presentFontSize;
// this.pageSize = pageSize;
// }
    public PageEvent( int presentFontSize, Rectangle pageSize) {
        this.presentFontSize = presentFontSize;
        this.pageSize = pageSize;
    }

// public void setHeader(String header) {
// this.header = header;
// }

    public void setPresentFontSize(int presentFontSize) {
        this.presentFontSize = presentFontSize;
    }


    /**
     *
     * TODO 文档打开时创建模板
     *
     * @see com.itextpdf.text.pdf.PdfPageEventHelper#onOpenDocument(com.itextpdf.text.pdf.PdfWriter,
     * com.itextpdf.text.Document)
     */
    public void onOpenDocument(PdfWriter writer, Document document) {
        total = writer.getDirectContent().createTemplate(50, 50);// 共 页 的矩形的长宽高
    }

    /**
     *
     * TODO 关闭每页的时候，写入页眉，写入'第几页共'这几个字。
     *
     * @see com.itextpdf.text.pdf.PdfPageEventHelper#onEndPage(com.itextpdf.text.pdf.PdfWriter,
     * com.itextpdf.text.Document)
     */
    public void onEndPage(PdfWriter writer, Document document) {
        this.addPage(writer, document);
        //加水印
        this.addWatermark(writer);
    }

    //加分页
    public void addPage(PdfWriter writer, Document document){
        //设置分页页眉页脚字体
        try {
            if (bf == null) {
                bf = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", false);
            }
            if (fontDetail == null) {
                fontDetail = new Font(bf, presentFontSize, Font.NORMAL);// 数据体字体
            }
        } catch (DocumentException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        // 1.写入页眉
// ColumnText.showTextAligned(writer.getDirectContent(),
// Element.ALIGN_LEFT, new Phrase(header, fontDetail),
// document.left(), document.top() + 20, 0);
// 页眉添加图片
// String path = ResourceUtils.getFile("classpath:").getPath();
// Image img = Image.getInstance(path + "/pdfTemplates/logo.jpg");
// img.setAlignment(Image.MIDDLE);
// img.setWidthPercentage(80);
// img.scaleToFit(50,40);
// img.setAbsolutePosition(document.left(),document.top());
// writer.getDirectContent().addImage(img);
        //页眉加下划线
// PdfPTable tableHeader = new PdfPTable(1);
// tableHeader.setTotalWidth(PageSize.A4.getWidth() - 60);
// PdfPCell pCell = new PdfPCell();
// pCell.setBorderWidthBottom(0.3f);
// tableHeader.addCell(pCell);
// tableHeader.writeSelectedRows(0, -1, 30, 805, writer.getDirectContent());

        // 2.写入前半部分的 第 X页/共
        int pageS = writer.getPageNumber();
        String foot1 = "第 " + pageS + " 页 /共";
// String foot1 = pageS +"/";
        Phrase footer = new Phrase(foot1, fontDetail);

        // 3.计算前半部分的foot1的长度，后面好定位最后一部分的'Y页'这俩字的x轴坐标，字体长度也要计算进去 = len
        float len = bf.getWidthPoint(foot1, presentFontSize);

        // 4.拿到当前的PdfContentByte
        PdfContentByte cb = writer.getDirectContent();

        // 5.写入页脚1，x轴就是(右margin+左margin + right() -left()- len)/2.0F
        // 再给偏移20F适合人类视觉感受，否则肉眼看上去就太偏左了
        // ,y轴就是底边界-20,否则就贴边重叠到数据体里了就不是页脚了；注意Y轴是从下往上累加的，最上方的Top值是大于Bottom好几百开外的。
        ColumnText
                .showTextAligned(
                        cb,
                        Element.ALIGN_CENTER,
                        footer,
                        (document.rightMargin() + document.right()
                                + document.leftMargin() - document.left() - len) / 2.0F ,
                        document.bottom() - 20, 0);

        // 6.写入页脚2的模板（就是页脚的Y页这俩字）添加到文档中，计算模板的和Y轴,X=(右边界-左边界 - 前半部分的len值)/2.0F +
        // len ， y 轴和之前的保持一致，底边界-20
        cb.addTemplate(total, (document.rightMargin() + document.right()
                        + document.leftMargin() - document.left()) / 2.0F ,
                document.bottom() - 20); // 调节模版显示的位置

    }

    //加水印
    public void addWatermark(PdfWriter writer) {
        // 水印图片
// Image image;
// try {
// image = Image.getInstance("./web/images/001.jpg");
// PdfContentByte content = writer.getDirectContentUnder();
// content.beginText();
// // 开始写入水印
// for(int k=0;k<5;k++){
// for (int j = 0; j <4; j++) {
// image.setAbsolutePosition(150*j,170*k);
// content.addImage(image);
// }
// }
// content.endText();
// } catch (IOException | DocumentException e) {
// // TODO Auto-generated catch block
// e.printStackTrace();
// }
        BaseFont font = null;
        try {
            font = BaseFont.createFont("STSong-Light","UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
        } catch (DocumentException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        PdfGState gs = new PdfGState();
        //添加透明度
        gs.setFillOpacity(0.4f);
        PdfContentByte content = writer.getDirectContentUnder();
        content.beginText();
        //水印颜色
        content.setColorFill(BaseColor.DARK_GRAY);
        content.setGState(gs);
        //水印字体样式和大小
        content.setFontAndSize(font, 35);
        //插入水印 循环每页插入的条数
        for (int j = 0; j < 3; j++) {
            content.showTextAligned(Element.ALIGN_CENTER, "锦鲤飞上天测试水印", 300, 200 * (j + 1), 30);
        }
        content.endText();
    }

    /**
     *
     * TODO 关闭文档时，替换模板，完成整个页眉页脚组件
     *
     * @see com.itextpdf.text.pdf.PdfPageEventHelper#onCloseDocument(com.itextpdf.text.pdf.PdfWriter,
     * com.itextpdf.text.Document)
     */
    public void onCloseDocument(PdfWriter writer, Document document) {
        // 7.最后一步了，就是关闭文档的时候，将模板替换成实际的 Y 值,至此，page x of y 制作完毕，完美兼容各种文档size。
        total.beginText();
        total.setFontAndSize(bf, presentFontSize);// 生成的模版的字体、颜色
        String foot2 = " " + (writer.getPageNumber()) + " 页"; //页脚内容拼接 如 第1页/共2页
// String foot2 = String.valueOf(writer.getPageNumber()); //页脚内容拼接 如 1/2
        total.showText(foot2);// 模版显示的内容
        total.endText();
        total.closePath();
    }
}

好了这就是生成pdf的代码了，controller层我就不粘出来了自己搞一下吧，希望可以帮助各位有需要的人，如果帮助到你了就帮忙点个赞，关注一下，我会不定时更新一些自己解决过的业务，希望可以帮助大家！！！

来源：blog.csdn.net/qq_45699784/article/details/127791747

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