java导出pdf（纯代码实现）

java导出pdf
在项目开发中，产品的需求越来越奇葩啦，开始文件下载都是下载为excel的，做着做着需求竟然变了，要求能导出pdf。导出pdf倒也不是特别大的问题关键就是麻烦。
导出pdf我知道的一共有3中方法：
方法一：利用模板导出，但是首先编辑模板的工具不好找，现有的国外的工具要收费，所以放弃了这个。
方法二：利用HTML页面导出，奈何自己不会写HTML，前端忙没时间帮忙写。本着求人不如靠己的想法就选择了第三种比较麻烦的方法，自己用table画。
方法三：自己用纯代码画格式（可调字体大小，颜色，对复杂没有规则的数据都可以）
首先必须导入的依赖有

<!--导出pdf所需包-->
        <dependency>
            <groupId>com.itextpdf</groupId>
            <artifactId>itextpdf</artifactId>
            <version>5.5.10</version>
        </dependency>
        <dependency>
            <groupId>com.itextpdf</groupId>
            <artifactId>itext-asian</artifactId>
            <version>5.2.0</version>
        </dependency>

然后就是一顿代码输出
先把效果贴上

然后是代码部分

@ApiOperation(value = "导出")
    @PostMapping("/download")
    @SneakyThrows(Exception.class)
    public void download(@RequestBody @Valid FumigationDTO fumigationDTO, HttpServletResponse response, HttpServletRequest request) {
        // 防止日志记录获取session异常
        request.getSession();
        // 设置编码格式
        response.setContentType("application/pdf;charset=UTF-8");
        response.setCharacterEncoding("utf-8");
        String fileName = URLEncoder.encode("下载的PDF名称", "UTF-8");
        response.setHeader("Content-disposition", "attachment;filename*=utf-8''" + fileName + ".pdf");
        fumigationService.download(fumigationDTO, response);
    }

业务层

@Override
    public void download(FumigationDTO fumigationDTO, HttpServletResponse response) throws IOException {
    	//要下载的数据查询数据部分我去掉了有需要自己根据业务取
        FumigationDowloadVO fumigationDowloadVO = new FumigationDowloadVO();
        

        // 定义全局的字体静态变量
        Font titlefont;
        Font headfont;
        Font keyfont = null;
        Font textfont = null;
        Font content = null;
        // 最大宽度
        try {
            // 不同字体（这里定义为同一种字体：包含不同字号、不同style）
            BaseFont bfChinese = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
            titlefont = new Font(bfChinese, 16, Font.BOLD);
            headfont = new Font(bfChinese, 14, Font.BOLD);
            keyfont = new Font(bfChinese, 10, Font.BOLD);
            textfont = new Font(bfChinese, 15, Font.NORMAL);
            content = new Font(bfChinese, 10, Font.NORMAL);

        } catch (Exception e) {
            e.printStackTrace();
        }
        BaseFont bf;
        Font font = null;
        try {
            //创建字体
            bf = BaseFont.createFont( "STSong-Light", "UniGB-UCS2-H",
                    BaseFont.NOT_EMBEDDED);
            //使用字体并给出颜色
            font = new Font(bf,20,Font.BOLD,BaseColor.BLACK);
        } catch (Exception e) {
            e.printStackTrace();
        }

        Document document = new Document(new RectangleReadOnly(842F, 595F));
        //设置页边距  60:左边距，60：右边距，72：上边距，72：下边距
        document.setMargins(60, 60, 72, 72);
        try {
            PdfWriter.getInstance(document,response.getOutputStream());
            //添加页码
            writer.setPageEvent(new PdfPageUtil());
            //打开生成的pdf文件
            document.open();
            //设置内容
            Paragraph paragraph = new Paragraph("熏蒸备案回执",font);
            paragraph.setAlignment(1);
            //引用字体
            document.add(paragraph);

            // 设置表格的列宽和列数
            float[] widths = {25f,25f,25f,25f,25f,25f};
            PdfPTable table = new PdfPTable(widths);
            table.setSpacingBefore(20f);
            // 设置表格宽度为100%
            table.setWidthPercentage(100.0F);
            table.setHeaderRows(1);
            table.getDefaultCell().setHorizontalAlignment(1);
            PdfPCell cell = null;
            //第一行
            cell = new PdfPCell(new Paragraph("熏蒸备案编码",content));
            cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
            cell.setHorizontalAlignment(Element.ALIGN_CENTER);
            cell.setFixedHeight(30);
            table.addCell(cell);

            cell = new PdfPCell(new Paragraph(fumigationDowloadVO.getXzbm()));
            cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
            cell.setHorizontalAlignment(Element.ALIGN_CENTER);
            table.addCell(cell);

            cell = new PdfPCell(new Paragraph("熏蒸备案时间",content));
            cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
            cell.setHorizontalAlignment(Element.ALIGN_CENTER);
            table.addCell(cell);

            cell = new PdfPCell(new Paragraph(CheckVerifyUtil.dateToString4(fumigationDowloadVO.getSqxzrq())));
            cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
            cell.setHorizontalAlignment(Element.ALIGN_CENTER);
            table.addCell(cell);

            cell = new PdfPCell(new Paragraph("申请备案单位",content));
            cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
            cell.setHorizontalAlignment(Element.ALIGN_CENTER);
            table.addCell(cell);

            cell = new PdfPCell(new Paragraph(fumigationDowloadVO.getDwmc(),content));
            cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
            cell.setHorizontalAlignment(Element.ALIGN_CENTER);
            table.addCell(cell);
            //第二行
            cell = new PdfPCell(new Paragraph("熏蒸作业库点",content));
            cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
            cell.setHorizontalAlignment(Element.ALIGN_CENTER);
            cell.setFixedHeight(30);
            table.addCell(cell);

            cell = new PdfPCell(new Paragraph(fumigationDowloadVO.getKdmc(),content));
            cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
            cell.setHorizontalAlignment(Element.ALIGN_CENTER);
            table.addCell(cell);

            cell = new PdfPCell(new Paragraph("负责人",content));
            cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
            cell.setHorizontalAlignment(Element.ALIGN_CENTER);
            table.addCell(cell);

            cell = new PdfPCell(new Paragraph(fumigationDowloadVO.getFzr(),content));
            cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
            cell.setHorizontalAlignment(Element.ALIGN_CENTER);
            table.addCell(cell);

            cell = new PdfPCell(new Paragraph("联系电话",content));
            cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
            cell.setHorizontalAlignment(Element.ALIGN_CENTER);
            table.addCell(cell);

            cell = new PdfPCell(new Paragraph(fumigationDowloadVO.getFzrdh(),content));
            cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
            cell.setHorizontalAlignment(Element.ALIGN_CENTER);
            table.addCell(cell);
            //第三行
            cell = new PdfPCell(new Paragraph("单据状态",content));
            cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
            cell.setHorizontalAlignment(Element.ALIGN_CENTER);
            cell.setFixedHeight(30);
            table.addCell(cell);

            cell = new PdfPCell(new Paragraph(shzt(fumigationDowloadVO.getShzt()),content));
            cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
            cell.setHorizontalAlignment(Element.ALIGN_CENTER);
            table.addCell(cell);

            cell = new PdfPCell(new Paragraph("审核时间",content));
            cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
            cell.setHorizontalAlignment(Element.ALIGN_CENTER);
            table.addCell(cell);

            cell = new PdfPCell(new Paragraph(CheckVerifyUtil.dateToString5(fumigationDowloadVO.getShsj()),content));
            cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
            cell.setHorizontalAlignment(Element.ALIGN_CENTER);
            table.addCell(cell);

            cell = new PdfPCell(new Paragraph(" ",content));
            cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
            cell.setHorizontalAlignment(Element.ALIGN_CENTER);
            table.addCell(cell);

            cell = new PdfPCell(new Paragraph(" ",content));
            cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
            cell.setHorizontalAlignment(Element.ALIGN_CENTER);
            table.addCell(cell);

            // 设置表格的列宽和列数
            float[] widths2 = {25f,25f,25f,25f,25f,25f};
            PdfPTable table2 = new PdfPTable(widths2);
            table2.setSpacingBefore(20f);
            // 设置表格宽度为100%
            table2.setWidthPercentage(100.0F);
            table2.setHeaderRows(1);
            table2.getDefaultCell().setHorizontalAlignment(1);

            //人员列表-第四行
            cell = new PdfPCell(new Paragraph("姓名",content));
            cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
            cell.setHorizontalAlignment(Element.ALIGN_CENTER);
            cell.setFixedHeight(20);
            table2.addCell(cell);

            cell = new PdfPCell(new Paragraph("职务",content));
            cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
            cell.setHorizontalAlignment(Element.ALIGN_CENTER);
            table2.addCell(cell);

            cell = new PdfPCell(new Paragraph("职业资格",content));
            cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
            cell.setHorizontalAlignment(Element.ALIGN_CENTER);
            table2.addCell(cell);

            cell = new PdfPCell(new Paragraph("身体状况",content));
            cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
            cell.setHorizontalAlignment(Element.ALIGN_CENTER);
            table2.addCell(cell);

            cell = new PdfPCell(new Paragraph("熏蒸任务分工",content));
            cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
            cell.setHorizontalAlignment(Element.ALIGN_CENTER);
            table2.addCell(cell);

            cell = new PdfPCell(new Paragraph("是否外包",content));
            cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
            cell.setHorizontalAlignment(Element.ALIGN_CENTER);
            table2.addCell(cell);
            //人员列表数据-第五行
            if(fumigationDowloadVO.getProples().size() > 0){
                for (RecordFumigationPeople prople : fumigationDowloadVO.getProples()) {
                    PdfPCell cell1 = new PdfPCell(new Paragraph(prople.getXm(), content));
                    PdfPCell cell2 = new PdfPCell(new Paragraph(prople.getZw(), content));
                    PdfPCell cell3 = new PdfPCell(new Paragraph(prople.getZyzg(), content));
                    PdfPCell cell4 = new PdfPCell(new Paragraph(prople.getStzk(), content));
                    PdfPCell cell5 = new PdfPCell(new Paragraph(prople.getXzrwfg(), content));
                    PdfPCell cell6 = new PdfPCell(new Paragraph(prople.getSfwb(), content));

                    //单元格对齐方式
                    cell1.setHorizontalAlignment(Element.ALIGN_CENTER);
                    cell1.setVerticalAlignment(Element.ALIGN_MIDDLE);
                    cell1.setFixedHeight(20);
                    //单元格垂直对齐方式
                    cell2.setHorizontalAlignment(Element.ALIGN_CENTER);
                    cell2.setVerticalAlignment(Element.ALIGN_MIDDLE);

                    cell3.setHorizontalAlignment(Element.ALIGN_CENTER);
                    cell3.setVerticalAlignment(Element.ALIGN_MIDDLE);

                    cell4.setHorizontalAlignment(Element.ALIGN_CENTER);
                    cell4.setVerticalAlignment(Element.ALIGN_MIDDLE);

                    cell5.setHorizontalAlignment(Element.ALIGN_CENTER);
                    cell5.setVerticalAlignment(Element.ALIGN_MIDDLE);

                    cell6.setHorizontalAlignment(Element.ALIGN_CENTER);
                    cell6.setVerticalAlignment(Element.ALIGN_MIDDLE);

                    table2.addCell(cell1);
                    table2.addCell(cell2);
                    table2.addCell(cell3);
                    table2.addCell(cell4);
                    table2.addCell(cell5);
                    table2.addCell(cell6);
                }
            }

            // 设置表格的列宽和列数
            float[] widths3 = {25f,25f,25f,25f,25f};
            PdfPTable table3 = new PdfPTable(widths3);
            table3.setSpacingBefore(20f);
            // 设置表格宽度为100%
            table3.setWidthPercentage(100.0F);
            table3.setHeaderRows(1);
            table3.getDefaultCell().setHorizontalAlignment(1);

            //实施储粮信息
            cell = new PdfPCell(new Paragraph("仓房",content));
            cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
            cell.setHorizontalAlignment(Element.ALIGN_CENTER);
            cell.setFixedHeight(20);
            table3.addCell(cell);

            cell = new PdfPCell(new Paragraph("货位",content));
            cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
            cell.setHorizontalAlignment(Element.ALIGN_CENTER);
            table3.addCell(cell);

            cell = new PdfPCell(new Paragraph("粮食品种",content));
            cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
            cell.setHorizontalAlignment(Element.ALIGN_CENTER);
            table3.addCell(cell);

            cell = new PdfPCell(new Paragraph("计划熏蒸开始时间",content));
            cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
            cell.setHorizontalAlignment(Element.ALIGN_CENTER);
            table3.addCell(cell);

            cell = new PdfPCell(new Paragraph("计划熏蒸结束时间",content));
            cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
            cell.setHorizontalAlignment(Element.ALIGN_CENTER);
            table3.addCell(cell);

            if(fumigationDowloadVO.getDtls().size() > 0){
                for (RecordFumigationDtlVO dtl : fumigationDowloadVO.getDtls()) {
                    PdfPCell cell1 = new PdfPCell(new Paragraph(dtl.getCfmc(), content));
                    PdfPCell cell2 = new PdfPCell(new Paragraph(dtl.getHwmc(), content));
                    PdfPCell cell3 = new PdfPCell(new Paragraph(dtl.getLspzmc(), content));
                    PdfPCell cell4 = new PdfPCell(new Paragraph(CheckVerifyUtil.dateToString4(dtl.getJhxzksrq()), content));
                    PdfPCell cell5 = new PdfPCell(new Paragraph(CheckVerifyUtil.dateToString4(dtl.getJhxzjsrq()), content));
                    //设置居中
                    cell1.setHorizontalAlignment(Element.ALIGN_CENTER);
                    cell1.setVerticalAlignment(Element.ALIGN_MIDDLE);
                    cell1.setFixedHeight(20);

                    cell2.setHorizontalAlignment(Element.ALIGN_CENTER);
                    cell2.setVerticalAlignment(Element.ALIGN_MIDDLE);

                    cell3.setHorizontalAlignment(Element.ALIGN_CENTER);
                    cell3.setVerticalAlignment(Element.ALIGN_MIDDLE);

                    cell4.setHorizontalAlignment(Element.ALIGN_CENTER);
                    cell4.setVerticalAlignment(Element.ALIGN_MIDDLE);

                    cell5.setHorizontalAlignment(Element.ALIGN_CENTER);
                    cell5.setVerticalAlignment(Element.ALIGN_MIDDLE);

                    table3.addCell(cell1);
                    table3.addCell(cell2);
                    table3.addCell(cell3);
                    table3.addCell(cell4);
                    table3.addCell(cell5);

                }
            }

            document.add(new Paragraph("\n"));
            document.add(new Paragraph("▋ 基本信息",content));
            document.add(new Paragraph("\n"));

            document.add(table);

            document.add(new Paragraph("\n"));
            document.add(new Paragraph("▋ 基本信息",content));
            document.add(new Paragraph("\n"));

            document.add(table2);

            document.add(new Paragraph("\n"));
            document.add(new Paragraph("▋ 熏蒸作业储粮粮情",content));
            document.add(new Paragraph("\n"));

            document.add(table3);
			//关闭文档
            document.close();


        } catch (DocumentException e) {
            e.printStackTrace();
            log.error("导出pdf失败:{}",e);
        }
    }

（二）2023-08-24 更新导出PDF无表格

效果：内容全部为代码实现

贴上代码：

@SneakyThrows
    @PostMapping("/rectification/notice/export")
    @ApiOperation("xxxx通知导出")
    public void registrationNoticeExport(@RequestBody InspectionPlanDtlListDTO reqParam, HttpServletRequest request, HttpServletResponse response) {
        request.getSession();
        if (StringUtils.isBlank(reqParam.getId())) {
            throw new CustomException("id不能为空");
        }
        String year = String.valueOf(Calendar.getInstance().get(Calendar.YEAR));
        ExpertSignInExportVO vo = inspectionProblemService.registrationNoticeExport(reqParam.getId());
        if(NoticeCoeEnum.getIdList().contains(vo.getId())){
            vo.setDate("2023年08月18日");
        }else {
            vo.setDate(DateUtil.date().toString(DatePattern.CHINESE_DATE_PATTERN));
        }
        // 检查单位
        List<InspectionPlanUnitVO> planUnitList = inspectionPlanUnitRelationMapper.selectByPlanId(vo.getPlanId());
        vo.setInspectionCompany(planUnitList.stream().map(InspectionPlanUnitVO::getUnitName).collect(Collectors.joining("、")));

        vo.setYear(year);

        Field[] fields = vo.getClass().getDeclaredFields();
        HashMap<String, String> dataMap = new HashMap<>(fields.length);
        for (Field field : fields) {
            field.setAccessible(true);
            dataMap.put("${" + field.getName() + "}", String.valueOf(field.get(vo)));
        }
        if (StringUtils.isNotBlank(vo.getInspectionTeamLeader()) || StringUtils.isNotBlank(vo.getInspectorPhone())) {
            dataMap.put("${inspectionTeamLeaderInfo}", String.format("（联系人：%s；联系电话：%s）",
                    vo.getInspectionTeamLeader(), StringUtils.isNotBlank(vo.getOfficePhone()) ? vo.getOfficePhone() : vo.getInspectorPhone()));
        }
        dataMap.put("${attachmentNameStr}", "    " + String.join("\n    ", vo.getAttachmentNameList()));

        //导出pdf
        PdfUtil.setResponseContentType(response, vo.getInspectedEnterprise() + vo.getPlanName() + "检查整改通知" + year);
//        PdfUtil.fillWordTemplate("template/rectification_notice.pdf", dataMap, response);
        PdfUtil.downloadPdf(dataMap,response);

//            String fileName = vo.getInspectedEnterprise() + vo.getPlanName() + "检查整改通知" + year;
//          //导出excel
//        WordUtil.setResponseContentType(response, fileName);
//        WordUtil.fillWordTemplate("template/rectification_notice.docx", dataMap, response.getOutputStream(),Boolean.TRUE);
    }

导出pdf工具

public static void setResponseContentType(HttpServletResponse response, String fileName) throws UnsupportedEncodingException {
        response.setContentType("application/pdf");
        response.setCharacterEncoding("utf-8");
        response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "utf-8") + ".pdf");
        response.setHeader("Access-Control-Expose-Headers", "Content-Disposition");
    }


public static void downloadPdf(Map<String,String> dataMap, HttpServletResponse response){
        // 定义全局的字体静态变量
        Font titlefont;
        Font headfont;
        Font keyfont = null;
        Font textfont = null;
        Font content = null;
        Font space = null;
        Font space1 = null;
        Font space2 = null;
        Font space3 = null;
        // 最大宽度
        try {
            // 不同字体（这里定义为同一种字体：包含不同字号、不同style）
            BaseFont bfChinese = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
            titlefont = new Font(bfChinese, 16, Font.BOLD);
            headfont = new Font(bfChinese, 14, Font.BOLD);
            keyfont = new Font(bfChinese, 22, Font.BOLD);
            textfont = new Font(bfChinese, 15, Font.NORMAL);
            content = new Font(bfChinese, 16, Font.NORMAL);
            space = new Font(bfChinese, 5, Font.NORMAL);
            space1 = new Font(bfChinese, 20, Font.NORMAL);
            space2 = new Font(bfChinese, 20, Font.NORMAL);
            space3 = new Font(bfChinese, 3, Font.NORMAL);

        } catch (Exception e) {
            e.printStackTrace();
        }
        BaseFont bf;
        Font font = null;
        try {
            //创建字体
            bf = BaseFont.createFont( "STSong-Light", "UniGB-UCS2-H",
                    BaseFont.NOT_EMBEDDED);
            //使用字体并给出颜色
            font = new Font(bf,36,Font.BOLD, BaseColor.RED);
        } catch (Exception e) {
            e.printStackTrace();
        }
        Document document = new Document(new Rectangle(com.itextpdf.text.PageSize.A4));

        try {
            com.itextpdf.text.pdf.PdfWriter.getInstance(document, response.getOutputStream());
            //打开PDF文件
            document.open();
            //设置内容
            Paragraph paragraph = new Paragraph("深圳市粮食和物资储备保障中心", font);
            //居中设置
            paragraph.setAlignment(Element.ALIGN_CENTER);
            document.add(paragraph);

            //页眉横线
            document.add(new Paragraph("\n", space2));
            LineSeparator line = new LineSeparator(3f, 100, BaseColor.RED, Element.ALIGN_CENTER, 0f);
            document.add(line);
            document.add(new Paragraph("\n", space3));
            LineSeparator lineStart = new LineSeparator(1f, 100, BaseColor.RED, Element.ALIGN_CENTER, 0f);
            document.add(lineStart);

            document.add(new Paragraph("\n", space));
            String text = "深储整改〔 " + dataMap.get("${year}") + "〕" + dataMap.get("${sort}") + "号";
            Paragraph paragraph0 = new Paragraph(text, content);
            paragraph0.setAlignment(Element.ALIGN_RIGHT);
            document.add(paragraph0);

            document.add(new Paragraph("\n"));
            Paragraph paragraph1 = new Paragraph(dataMap.get("${inspectionCompany}") + "关于", keyfont);
            paragraph1.setAlignment(Element.ALIGN_CENTER);
            document.add(paragraph1);

            document.add(new Paragraph("\n", space));
            String concent = dataMap.get("${planName}") + "发现问题整改的通知";
            Paragraph paragraph2 = new Paragraph(concent, keyfont);
            paragraph2.setAlignment(Element.ALIGN_CENTER);
            document.add(paragraph2);

            document.add(new Paragraph("\n"));
            Paragraph paragraph3 = new Paragraph(dataMap.get("${qymc}") + ":", content);
            paragraph3.setAlignment(Element.ALIGN_LEFT);
            document.add(paragraph3);

            document.add(new Paragraph("\n", space));
            String concent1 = "             现将" + dataMap.get("${kdmc}") + dataMap.get("${planName}")
                    + "检查发现问题及整改要求转给你司，请严格按期限要求进行整改，并将整改落实情况(含佐证材料及附件)通过深圳市粮食和物资储备信息管理平台反馈我中心。";
            Paragraph paragraph4 = new Paragraph(concent1, content);
            //设置首行缩进
            paragraph4.setIndentationRight(2);
            document.add(paragraph4);

            document.add(new Paragraph("\n", space));
            Paragraph paragraph5 = new Paragraph("              特此通知。", content);
            paragraph5.setIndentationRight(2);//右缩进2格
            document.add(paragraph5);

            document.add(new Paragraph("\n", space1));
            document.add(new Paragraph("\n", space1));
            //附件
            Paragraph paragraph6 = new Paragraph("              附件:", content);
            paragraph6.setIndentationRight(2);//右缩进2格
            document.add(paragraph6);

            document.add(new Paragraph("\n", space));
            Paragraph paragraph7 = new Paragraph(dataMap.get("${attachmentNameStr}"), content);
            document.add(paragraph7);

            document.add(new Paragraph("\n", space1));
            document.add(new Paragraph("\n", space1));
            document.add(new Paragraph("\n", space1));

            //日期
            Paragraph paragraph8 = new Paragraph(dataMap.get("${date}"), content);
            //向右
            paragraph8.setAlignment(Element.ALIGN_RIGHT);
            document.add(paragraph8);

            document.add(new Paragraph("\n", space1));
            //落款
            Paragraph paragraph9 = new Paragraph(dataMap.get("${inspectionTeamLeaderInfo}"), content);
            paragraph9.setAlignment(Element.ALIGN_CENTER);
            document.add(paragraph9);

            //页尾横线
            document.add(new Paragraph("\n", space2));
            document.add(new Paragraph("\n", space2));
            LineSeparator lineEnd = new LineSeparator(3f, 100, BaseColor.RED, Element.ALIGN_CENTER, 0f);
            document.add(lineEnd);
            document.add(new Paragraph("\n", space3));
            LineSeparator lineEnd1 = new LineSeparator(1f, 100, BaseColor.RED, Element.ALIGN_CENTER, 0f);
            document.add(lineEnd1);


            //关闭文档
            document.close();

        } catch (Exception e) {
            e.printStackTrace();
            log.error("导出pdf失败：{}", e);
        }


    }

更新于2023-12-15，更新内容：导出PDF增加页码和设置页边距
以下为效果图：

package com.sydata.zt.common.pdf;

import com.itextpdf.text.*;
import com.itextpdf.text.pdf.*;

import java.io.IOException;

/**
 * @Author xx
 * @Date 2023/12/15 10:05
 * @Description: 导出pdf添加页数
 * @Version 1.0
 */
public class PdfPageUtil 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 = 15;

    /**
     * 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 PdfPageUtil() {

    }

    /**
     *
     *  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 PdfPageUtil( int presentFontSize, Rectangle pageSize) {
        this.presentFontSize = presentFontSize;
        this.pageSize = pageSize;
    }

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

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

    /**
     *
     *关闭每页的时候，写入页眉，写入'第几页共'这几个字。
     */
    @Override
    public void onEndPage(PdfWriter writer, Document document) {
        this.addPage(writer, document);
    }

    //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);
        // 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
        ColumnText
                .showTextAligned(
                        cb,
                        Element.ALIGN_CENTER,
                        footer,
                        (document.rightMargin() + document.right()
                                + document.leftMargin() - document.left() - len) / 2.0F ,
                        document.bottom() - 10, 0);
        cb.addTemplate(total, (document.rightMargin() + document.right()
                        + document.leftMargin() - document.left()) / 2.0F ,
                document.bottom() - 10); // 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();
//        }
//    }

    /**
     *
     * 关闭文档时，替换模板，完成整个页眉页脚组件
     */
    @Override
    public void onCloseDocument(PdfWriter writer, Document document) {
        // 关闭文档的时候，将模板替换成实际的 Y 值
        total.beginText();
        // 生成的模版的字体、颜色
        total.setFontAndSize(bf, presentFontSize);
        //页脚内容拼接  如  第1页/共2页
        //String foot2 = " " + (writer.getPageNumber()) + " 页";
        //页脚内容拼接  如  第1页/共2页
        String foot2 = String.valueOf(writer.getPageNumber());
        // 模版显示的内容
        total.showText(foot2);
        total.endText();
        total.closePath();
    }
}

然后就可以了直接导出pdf。文章来源地址https://www.toymoban.com/news/detail-568905.html

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