1 背景
文章主要通过Java纯后端实现生成PDF源码方案，可以实现PDF表格、图片、统计图及模板！这里需要用到的技术：JDK8、SpringBoot、POM、lombok、hutool等
2 项目准备
搭建一个SpringBoot项目，这个很简单就不举例了 。然后引入pom依赖如下：com.itextpdf itextpdf5.5.9 com.itextpdf itext-asian5.2.0 org.projectlombok lombokcn.hutool hutool-core5.4.3 compile3 JAVA根据已有的pdf模板 ， 填充数据生成pdf（图片及动态生成表格）
- 实体类
package com.test.merservice.controller.miniapp;import lombok.Data;import lombok.experimental.Accessors;import java.math.BigDecimal;/** *对账 */@Data@Accessors(chain = true)public class Reconciliation {private String jg;private Integer ydz;private Integer wdz;private BigDecimal dzl;}逾期表格实体
package com.test.merservice.controller.miniapp;import lombok.Data;import lombok.experimental.Accessors;import java.io.Serializable;/** *逾期表格 */@Data@Accessors(chain = true)public class BeOverdueTable implements Serializable {private String jg;private Integer yqs;}- 填充数据到已有模板，并PDF代码
package com.test.merservice.controller.miniapp;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;/** * 动态生成PDF */public class CreatePdfEchrtsAndTable {private final static String TITLE = "标题";public void createPdfFile(HttpServletResponse response) throws IOException, DocumentException, TemplateException {//设置请求返回类型response.setHeader("Content-Disposition", "attachment; filename=对账测试.pdf");OutputStream outputStream = response.getOutputStream();//模板路径 ， 放到项目里用这个ClassPathResourceClassPathResource classPathResource = new ClassPathResource("templates/模板.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 reconciliation = new ArrayList<>();for (int i = 1; i <= 1000; i) {Reconciliation reconciliation = new Reconciliation();reconciliation.setJg("机构"i).setYdz(i).setWdz(i).setDzl(new BigDecimal(i));reconciliation.add(reconciliation);}for (int i = 0; i < reconciliation.size(); i) {PdfPCell setCell1 = createSetCell((i1)"", textFont);PdfPCell setCell2 = createSetCell(reconciliation.get(i).getJg(), textFont);PdfPCell setCell3 = createSetCell(reconciliation.get(i).getYdz().toString(), textFont);PdfPCell setCell4 = createSetCell(reconciliation.get(i).getWdz().toString(), textFont);PdfPCell setCell5 = createSetCell(reconciliation.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 yqTables = new ArrayList<>();for (int i = 1; i <= 1000; i) {BeOverdueTable yq = new BeOverdueTable();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);}} 注意：Document.document.newPage(); 每次都新打开一页 ， 这样可以避免内容重叠 。
4 JAVA根据已有模板，填充数据生成pdf（水印动态表格）
- 实体同上不变
- 页眉、页脚和水印工具类
package com.test.merservice.controller.miniapp;import com.itextpdf.text.*;import com.itextpdf.text.pdf.*;import java.io.IOException;/** * 页眉、页脚、水印 */public class PdfPageEvent extends PdfPageEventHelper {/*** 页眉*///public String header = "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;/*** 无参构造方法.*/public PdfPageEvent() {}/*** 构造方法.* @param presentFontSize*数据体字体大小* @param pageSize*页面文档大?。珹4，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 PdfPageEvent(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marginright() -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 * (j1), 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();}}- PDF生成
package com.sllt.merservice.controller.miniapp;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 CreatePdfEchrtsAndTableTwo {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 duizhangDomains = new ArrayList<>();for (int i = 1; i <= 1000; i) {Reconciliation reconciliation = new Reconciliation();reconciliation.setJg("机构"i).setYdz(i).setWdz(i).setDzl(new BigDecimal(i));duizhangDomains.add(reconciliation);}for (int i = 0; i < duizhangDomains.size(); i) {PdfPCell setCell1 = createSetCell((i1)"", 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 yqTables = new ArrayList<>();for (int i = 1; i <= 1000; i) {BeOverdueTable yq = new BeOverdueTable();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);}}