刚接到了一个需求，生成一个pdf，一开始以为挺简单的，通过模板生成嘛，我也发过相应的文章，根据模板直接生成pdf，响应到前端或者根据模板生成pdf，直接指定下载位置，这两种方案都可以，不过这篇文章主要讲的生成的pdf是既有模板填充还需要自己动态生成表格，包括还需要通过java去生成Echarts图形，通过java后台生成Echarts图形我专门写了一篇文章介绍，java后台生成统计图，这个生成统计图的文章中有两种生成统计图的方式，可以自己选择。
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。
最近很多人都找我要模板链接，我把他放到网盘了，需要的可以去下载https://pan.baidu.com/s/1YJZtLdiySxUry4h2Gd1V7g
提取码：j1l5，不想从网盘下的也可以从的我csdn资源里面下载，资源里面我也放了一份，0积分下载的，大家自取就好。
一、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>二、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
package com.example.demo.domain;import lombok.Data;import lombok.experimental.Accessors;import java.math.BigDecimal;@Data@Accessors(chain = true)public class DuizhangDomain {private String jg;private Integer ydz;private Integer wdz;private BigDecimal dzl;}package com.example.demo.domain;import lombok.Data;import lombok.experimental.Accessors;import java.io.Serializable;@Data@Accessors(chain = true)public class YqTable implements Serializable {private String jg;private Integer yqs;}生成pdf代码
import cn.hutool.core.date.DateUtil;import com.example.demo.domain.DuizhangDomain;import com.example.demo.domain.YqTable;import com.example.demo.pdf.phantom.App;import com.example.demo.pdf.phantom.PageEvent;import com.itextpdf.text.*;import com.itextpdf.text.pdf.*;import freemarker.template.TemplateException;import org.springframework.core.io.ClassPathResource;import javax.servlet.http.HttpServletResponse;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.math.BigDecimal;import java.util.ArrayList;import java.util.List;/** * 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ClassPathResourceClassPathResource 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logoRectangle 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
三、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
package com.example.demo.pdf;import cn.hutool.core.date.DateUtil;import com.example.demo.domain.DuizhangDomain;import com.example.demo.domain.YqTable;import com.example.demo.pdf.phantom.PageEvent;import com.itextpdf.text.*;import com.itextpdf.text.pdf.*;import freemarker.template.TemplateException;import org.springframework.core.io.ClassPathResource;import javax.servlet.http.HttpServletResponse;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.math.BigDecimal;import java.util.ArrayList;import java.util.List;/** * 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ClassPathResourceClassPathResource 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
package com.example.demo.pdf.phantom;import com.itextpdf.text.*;import com.itextpdf.text.pdf.*;import java.io.IOException;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 = lenfloat len = bf.getWidthPoint(foot1, presentFontSize);// 4.拿到当前的PdfContentBytePdfContentByte 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-20cb.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1/2total.showText(foot2);// 模版显示的内容total.endText();total.closePath();}}四、生成pdf，多页模板方式
2023-03-27更新，各位粉丝本人在用过一段时间pdf生成以后，突然有了多页模板图片和描述的需求，需要多页画模板域，因此呢有了下面的代码。
import cn.hutool.core.date.DateUtil;import com.example.demo.domain.DuizhangDomain;import com.example.demo.domain.YqTable;import com.example.demo.pdf.phantom.App;import com.example.demo.pdf.phantom.PageEvent;import com.itextpdf.text.*;import com.itextpdf.text.pdf.*;import freemarker.template.TemplateException;import org.springframework.core.io.ClassPathResource;import javax.servlet.http.HttpServletResponse;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.math.BigDecimal;import java.util.ArrayList;import java.util.List;/** * 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ClassPathResourceClassPathResource 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);//这里需要注意一下，多模块的时候文本域是可以随便填写的，但是图片的文本域需要获取下一页的坐标。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，这是获取的第一页的PdfContentByte PdfContentByte cb = ps.getOverContent(1);//添加logoRectangle 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" />);//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);}//第二页的图片域，如果第三页有模板写3即可PdfContentByte cb2 = ps.getOverContent(2);//添加图片Rectangle test = s.getFieldPositions("test").get(0).position;byte[] base = bankReportPdfService.getBankHistogramDataBase64All(bankId, startTime, endTime, reportTimeType, bank);Image testImage = Image.getInstance(base);//这里需要注意一下，如果没有获取第二页的PdfContentByte的话直接填充第二页的图片域图片会顶上去// 设根据域大小设置缩放图片testImage .scaleToFit(test .getWidth(),400);// 设置居中testImage .setAlignment(Image.MIDDLE);// 绝对定位testImage .setAbsolutePosition(test .getLeft(),test .getBottom());cb2.ddImage(testImage );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(); //多页模板，你有几页模板写几页就行，我这是两页模板for (int i = 1; i <= 2; i++) {PdfImportedPage pageTemplate = writer.getImportedPage(reader, i);cbUnder.addTemplate(pageTemplate, 0, 0);//这里每次循环都要创建一个新的页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);}}生成结果示例
可以看到第二页我也是通过模板的图片文本域生成图片，我们可以通过这种方法来进行多页模板生成。
五、图片加入pdf动态生成，不需要添加指定模板域
2023-06-30更新，今天有朋友问图片能不能动态渲染位置，不需要添加模板域，其实是可以的，我把代码粘贴到下面，大家可以做个参考，其实看到这里基本上套路大家也就知道了，所以我就不粘贴那些繁琐的创建pdf的document之类的代码了，直接上面粘贴就行，这里只粘贴关于无指定域添加图片的代码。
//获取图片的字节码，这里我是用echarts生成的统计图，如果对echarts后台生成感兴趣的话可以看我另一篇文章（文章是收费的哦，白嫖客不用点了）。byte[] base = bankReportPdfService.getBankHistogramDataBase64All(bankId, startTime, endTime, reportTimeType, bank);Image ajgAllImage = Image.getInstance(base);//设置图片位置的x轴和y轴ajgAllImage.setAbsolutePosition(80, 400);//注意是从文档的左下角往右、往上计算的//设置图片的宽度和高度ajgAllImage.scaleToFit(1000, 300);// 设置居中ajgAllImage.setAlignment(Image.MIDDLE);//将图片添加到pdf文件中document.add(ajgAllImage);只需要这一段代码就可以实现动态添加无模块域图片了，如果需要好多页面添加的话就加上document.newPage();，重新new一页，就可以了，注意间距，每页的xy轴都是从0开始的。
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！！！