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

                    com.itextpdf            itextpdf            5.5.10                            com.itextpdf            itext-asian            5.2.0        

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));        try {            PdfWriter.getInstance(document,response.getOutputStream());            //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);        }    }

然后就可以了直接导出pdf。

来源地址：https://blog.csdn.net/weixin_51114236/article/details/131729816