package com.company.common.core.utils.itext;import com.itextpdf.text.*;
import com.itextpdf.text.pdf.*;
import lombok.SneakyThrows;import java.io.IOException;/*** pdf的页眉页脚设置** @author kally* @date 2022/8/26*/
public class PdfHeaderFooter extends PdfPageEventHelper {/*** 总页数*/PdfTemplate totalPage;/*** 字体*/Font hfFont;{try {hfFont = new Font(BaseFont.createFont("font/msyh.ttf", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED), 10);} catch (DocumentException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}/*** 打开文档时，创建一个总页数的模版*/@Overridepublic void onOpenDocument(PdfWriter writer, Document document) {PdfContentByte cb = writer.getDirectContent();// 共n页的宽高totalPage = cb.createTemplate(50, 14);}/*** 一页加载完成触发，写入页眉和页脚*/@SneakyThrows@Overridepublic void onEndPage(PdfWriter writer, Document document) {// 首页 不加分页内容int currentPage = 0;if (document.getPageNumber() == 1) {return;} else {currentPage = document.getPageNumber() - 1;}// 创建一个两列的表格PdfPTable table = new PdfPTable(2);try {// 总宽度为A4纸张宽度table.setTotalWidth(PageSize.A4.getWidth());// 锁定列宽table.setLockedWidth(true);// 设置每列宽度table.setWidths(new int[]{50, 50});PdfPCell cell = new PdfPCell(new Phrase("第" + currentPage + "页/", hfFont));// 设置水平右对齐cell.setHorizontalAlignment(Element.ALIGN_RIGHT);// 设置垂直居中cell.setVerticalAlignment(Element.ALIGN_MIDDLE);// 隐藏全部边框cell.disableBorderSide(15);table.addCell(cell);// 共x页Image totalPageImage = Image.getInstance(totalPage);totalPageImage.setPaddingTop(-10f);PdfPCell cell1 = new PdfPCell(totalPageImage);// 设置水平左对齐cell1.setHorizontalAlignment(Element.ALIGN_LEFT);// 设置垂直居中cell1.setVerticalAlignment(Element.ALIGN_MIDDLE);cell1.disableBorderSide(15);table.addCell(cell1);table.writeSelectedRows(0, -1, 0, 50, writer.getDirectContent());} catch (Exception e) {throw new ExceptionConverter(e);}// 生成左侧页眉ColumnText.showTextAligned(writer.getDirectContent(),Element.ALIGN_LEFT, new Paragraph("***科技有限公司", hfFont),document.left(), PageSize.A4.getHeight() - 26, 0);// 生成右侧页眉ColumnText.showTextAligned(writer.getDirectContent(),Element.ALIGN_RIGHT, new Paragraph("巡检缺陷识别分析报告", hfFont),document.right(), PageSize.A4.getHeight() - 26, 0);// 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);// 表格的第一行坐标【x=40;y=734】tableHeader.writeSelectedRows(0, -1, 30, 814, writer.getDirectContent());// 页面加水印PdfContentByte waterMar = writer.getDirectContentUnder();addWaterMar(waterMar);}/*** 全部完成后，将总页数的pdf模版写到指定位置*/@Overridepublic void onCloseDocument(PdfWriter writer, Document document) {int total = writer.getPageNumber() - 1;String text = "共" + total + "页";ColumnText.showTextAligned(totalPage, Element.ALIGN_MIDDLE, new Paragraph(text, hfFont), 0, 3, 0);}/*** 加水印** @param waterMar {@link Document}* @throws DocumentException*/private void addWaterMar(PdfContentByte waterMar) throws DocumentException {try {// 开始设置水印waterMar.beginText();// 设置水印透明度PdfGState gs = new PdfGState();// 设置填充字体不透明度为0.4fgs.setFillOpacity(0.2f);// 设置水印字体参数及大小(字体参数，字体编码格式，是否将字体信息嵌入到pdf中（一般不需要嵌入），字体大小)waterMar.setFontAndSize(BaseFont.createFont("font/msyh.ttf", BaseFont.IDENTITY_H, BaseFont.EMBEDDED), 120);// 设置透明度waterMar.setGState(gs);// 设置水印对齐方式 水印内容 X坐标 Y坐标 旋转角度waterMar.showTextAligned(Element.ALIGN_CENTER, "水印水印", 300, 400, 48);// 设置水印颜色waterMar.setColorFill(BaseColor.GRAY);//结束设置waterMar.endText();waterMar.stroke();} catch (IOException e) {e.printStackTrace();}}}

问题点汇总：

1、页眉加下划线—表格的第一行坐标【x=40;y=734】

根据下划线的坐标位置动态调整

tableHeader.writeSelectedRows(0, -1, 30, 814, writer.getDirectContent());

2、页脚；共n页

根据共n页的坐标位置动态调整

ColumnText.showTextAligned(totalPage, Element.ALIGN_MIDDLE, new Paragraph(text, hfFont), 0, 3, 0);

3、引用

PdfWriter pdfWriter = PdfWriter.getInstance(document, new FileOutputStream(pdfFile));
// 添加页眉/页脚/水印
pdfWriter.setPageEvent(new PdfHeaderFooter());