Java把列表数据导出为PDF文件，同时加上PDF水印

一、实现效果

二、遇到的问题

1. 实现导出PDF主体代码参考：Java纯代码实现导出PDF功能，下图是原作者实现的效果
   
2. 导出报错Font 'STSong-Light' with 'UniGB-UCS2-H' is not recognized.。参考：itext 生成 PDF(五) 使用外部字体

网上都是说jar包的版本不对，导致的字体兼容性问题。换了jar包版本发现没效果，后来索性直接把字体下载到本地直接引入。

3. jar包发布到服务器上导出PDF的时候发生报错BOOT-INF/classes!/fonts/SimSun.ttf not exists。

可以看到字体文件在jar目录下面是有的，但是发现classes后面多了个叹号。这是引入外部字体方式不对，后改用问题2参考文章的第三种写法就没问题了。

4. 添加水印参考：itextpdf5.5.13给pdf添加图片水印、添加文字水印（平铺）、添加文字水印（单个）、添加页眉、页脚、页眉事件、添加图片

三、测试数据展示

list：子节点数据
0 = {BasBudgetDetailVo@16046} "BasBudgetDetailVo(budgetId=2064535550, functionId=231231232, budgetQuantity=3, totalPrice=2664.00, functionName=功能1, functionDescription=功能1描述, functionUnit=套, functionPrice=888.00, parentId=231234512, functionSort=1)"
1 = {BasBudgetDetailVo@16047} "BasBudgetDetailVo(budgetId=2039369726, functionId=231236478, budgetQuantity=1, totalPrice=888.00, functionName=功能1, functionDescription=功能1描述, functionUnit=套, functionPrice=888.00, parentId=231234879, functionSort=1)"
2 = {BasBudgetDetailVo@16048} "BasBudgetDetailVo(budgetId=2039369725, functionId=231236473, budgetQuantity=1, totalPrice=888.00, functionName=功能2, functionDescription=功能2描述, functionUnit=套, functionPrice=888.00, parentId=231234879, functionSort=2)"
3 = {BasBudgetDetailVo@16049} "BasBudgetDetailVo(budgetId=2056146943, functionId=231231241, budgetQuantity=1, totalPrice=888.00, functionName=功能2, functionDescription=功能2描述, functionUnit=套, functionPrice=888.00, parentId=231234512, functionSort=2)"
4 = {BasBudgetDetailVo@16050} "BasBudgetDetailVo(budgetId=2047758334, functionId=231236487, budgetQuantity=1, totalPrice=888.00, functionName=功能3, functionDescription=功能3描述, functionUnit=套, functionPrice=888.00, parentId=231234512, functionSort=3)"
5 = {BasBudgetDetailVo@16051} "BasBudgetDetailVo(budgetId=2039369724, functionId=231231245, budgetQuantity=1, totalPrice=888.00, functionName=功能3, functionDescription=功能3描述, functionUnit=套, functionPrice=888.00, parentId=231234879, functionSort=3)"
6 = {BasBudgetDetailVo@16052} "BasBudgetDetailVo(budgetId=2047758333, functionId=231231597, budgetQuantity=1, totalPrice=888.00, functionName=功能4, functionDescription=功能4描述, functionUnit=套, functionPrice=888.00, parentId=231234512, functionSort=4)"
7 = {BasBudgetDetailVo@16053} "BasBudgetDetailVo(budgetId=2030981118, functionId=231233154, budgetQuantity=1, totalPrice=888.00, functionName=功能4, functionDescription=功能4描述, functionUnit=套, functionPrice=888.00, parentId=231234879, functionSort=4)"
8 = {BasBudgetDetailVo@16054} "BasBudgetDetailVo(budgetId=2030981117, functionId=231234596, budgetQuantity=1, totalPrice=888.00, functionName=功能5, functionDescription=功能5描述, functionUnit=套, functionPrice=888.00, parentId=231234879, functionSort=5)"
9 = {BasBudgetDetailVo@16055} "BasBudgetDetailVo(budgetId=2030981116, functionId=231235487, budgetQuantity=1, totalPrice=888.00, functionName=功能6, functionDescription=功能6描述, functionUnit=套, functionPrice=888.00, parentId=231234879, functionSort=6)"functionInfoList：根节点数据
0 = {BasFunctionInfo@16090} "BasFunctionInfo(functionId=231234512, functionName=模块1, functionDescription=, functionUnit=0, functionPrice=0.00, createName=管理员, createBy=admin, createTime=Wed Jan 24 16:56:35 CST 2024, updateName=管理员, updateBy=admin, updateTime=Wed Jan 24 16:56:38 CST 2024, functionQuantity=null, functionSort=1, parentId=null)"
1 = {BasFunctionInfo@16091} "BasFunctionInfo(functionId=231234879, functionName=模块2, functionDescription=, functionUnit=0, functionPrice=0.00, createName=管理员, createBy=admin, createTime=Wed Jan 24 16:56:35 CST 2024, updateName=管理员, updateBy=admin, updateTime=Wed Jan 24 16:56:38 CST 2024, functionQuantity=null, functionSort=2, parentId=null)"matchList：当前节点的子节点数据

四、jar包引入

<!--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>
</dependencies>

五、外部字体引入

字体文件资源自己百度，直接搜SimSun.ttf字体下载不难找

六、代码实现

private final ResourceLoader resourceLoader;public BasBudgetDetailServiceImpl(ResourceLoader resourceLoader) {this.resourceLoader = resourceLoader;
}/*** 导出pdf* * @param response* @throws Exception*/
@Override
public void downloadPdf(HttpServletResponse response) throws Exception {// 业务数据，根据需求查询获取// 子节点数据List<BasBudgetDetailVo> list;// 根子节点数据List<BasFunctionInfo> functionInfoList;// 定义全局的字体静态变量Font content = null;Resource resource = resourceLoader.getResource("classpath:/fonts/SimSun.ttf");InputStream inputStream = resource.getInputStream();BaseFont bfChinese = null;try {// 字体bfChinese = BaseFont.createFont("SimSun.ttf", BaseFont.IDENTITY_H, BaseFont.EMBEDDED, true, IOUtils.toByteArray(inputStream), null);content = new Font(bfChinese, 10, Font.NORMAL);} catch (Exception e) {e.printStackTrace();}BaseFont bf = null;Font font = null;try {//创建字体bf = BaseFont.createFont("SimSun.ttf", BaseFont.IDENTITY_H, BaseFont.EMBEDDED, true, IOUtils.toByteArray(inputStream), null);//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 pdfWriter = PdfWriter.getInstance(document, response.getOutputStream());//打开生成的pdf文件document.open();//设置标题Paragraph paragraph = new Paragraph("这是标题文档标题", font);paragraph.setAlignment(1);//引用字体document.add(paragraph);// 总额BigDecimal detailTotal = BigDecimal.valueOf(0);for (BasFunctionInfo functionInfo : functionInfoList) {// 匹配明细List<BasBudgetDetailVo> matchList = list.stream().filter(item ->String.valueOf(item.getParentId()).equals(String.valueOf(functionInfo.getFunctionId()))).collect(Collectors.toList());// 设置表格的列宽和列数float[] widths = {10f, 35f, 70f, 10f, 10f, 20f, 20f};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);//列表-表头String[] titleList = new String[]{"序号", "功能名称", "功能描述", "数量", "单位", "单价（元）", "总价（元）"};addTableTitle(table, content, titleList);// 模块总额BigDecimal modelTotal = BigDecimal.valueOf(0);//列表数据if (matchList.size() > 0) {Integer index = 1;for (BasBudgetDetailVo item : matchList) {PdfPCell cell1 = new PdfPCell(new Paragraph(String.valueOf(index), content));PdfPCell cell2 = new PdfPCell(new Paragraph(item.getFunctionName(), content));PdfPCell cell3 = new PdfPCell(new Paragraph(item.getFunctionDescription(), content));PdfPCell cell4 = new PdfPCell(new Paragraph(String.valueOf(item.getBudgetQuantity()), content));PdfPCell cell5 = new PdfPCell(new Paragraph(item.getFunctionUnit(), content));PdfPCell cell6 = new PdfPCell(new Paragraph(String.valueOf(item.getFunctionPrice()), content));BigDecimal totalPrice = item.getFunctionPrice().multiply(BigDecimal.valueOf(item.getBudgetQuantity()));PdfPCell cell7 = new PdfPCell(new Paragraph(String.valueOf(totalPrice), content));//单元格对齐方式cell1.setFixedHeight(20);cell1.setHorizontalAlignment(Element.ALIGN_CENTER);cell1.setVerticalAlignment(Element.ALIGN_MIDDLE);// 文字长度大于15的时候，设置表格行间距，底边距离if (item.getFunctionName().length() > 15) {cell2.setLeading(0f, 1.5f);cell2.setPaddingBottom(10);}cell2.setHorizontalAlignment(Element.ALIGN_CENTER);cell2.setVerticalAlignment(Element.ALIGN_MIDDLE);// 文字长度大于30的时候，设置表格行间距，底边距离if (item.getFunctionDescription().length() > 30) {cell3.setLeading(0f, 1.5f);cell3.setPaddingBottom(10);}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);cell7.setHorizontalAlignment(Element.ALIGN_CENTER);cell7.setVerticalAlignment(Element.ALIGN_MIDDLE);table.addCell(cell1);table.addCell(cell2);table.addCell(cell3);table.addCell(cell4);table.addCell(cell5);table.addCell(cell6);table.addCell(cell7);// 序号index++;modelTotal = modelTotal.add(totalPrice);}// 合计行PdfPCell cell1 = new PdfPCell(new Paragraph("合计", content));cell1.setFixedHeight(20);cell1.setHorizontalAlignment(Element.ALIGN_CENTER);cell1.setVerticalAlignment(Element.ALIGN_MIDDLE);// 空格PdfPCell cell2 = new PdfPCell(new Paragraph("", content));cell2.setFixedHeight(20);cell2.setHorizontalAlignment(Element.ALIGN_CENTER);cell2.setVerticalAlignment(Element.ALIGN_MIDDLE);// 数额PdfPCell cell3 = new PdfPCell(new Paragraph(String.valueOf(modelTotal), content));cell3.setFixedHeight(20);cell3.setHorizontalAlignment(Element.ALIGN_CENTER);cell3.setVerticalAlignment(Element.ALIGN_MIDDLE);table.addCell(cell1);table.addCell(cell2);table.addCell(cell2);table.addCell(cell2);table.addCell(cell2);table.addCell(cell2);table.addCell(cell3);detailTotal = detailTotal.add(modelTotal);}document.add(new Paragraph("\n"));document.add(new Paragraph("▋ " + functionInfo.getFunctionName(), content));document.add(table);document.add(new Paragraph("\n"));if (matchList.size() == 0) {document.add(new Paragraph("暂无数据", content));}}document.add(new Paragraph("\n"));document.add(new Paragraph("总计：" + detailTotal + "元", content));// 加水印PdfContentByte waterMar = pdfWriter.getDirectContentUnder();String text = "天天想辞职月月拿全勤";addTextFullWaterMark(waterMar, text, bfChinese);document.close();} catch (DocumentException e) {e.printStackTrace();log.error("导出pdf失败:{}", e);}
}/*** 给表格添加表头** @param table* @param content* @param titleList*/
public void addTableTitle(PdfPTable table, Font content, String[] titleList) {PdfPCell cell = null;for (String title : titleList) {cell = new PdfPCell(new Paragraph(title, content));cell.setVerticalAlignment(Element.ALIGN_MIDDLE);cell.setHorizontalAlignment(Element.ALIGN_CENTER);cell.setFixedHeight(20);cell.setNoWrap(false);table.addCell(cell);}
}/*** 给pdf添加文字水印（平铺）** @param waterMar* @param text     水印文本* @throws Exception*/
public static void addTextFullWaterMark(PdfContentByte waterMar, String text, BaseFont bf) {waterMar.beginText();PdfGState gs = new PdfGState();// 设置填充字体不透明度为0.2fgs.setFillOpacity(0.2f);waterMar.setFontAndSize(bf, 20);// 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for (int x = 0; x <= 900; x += 200) {for (int y = -50; y <= 800; y += 200) {waterMar.showTextAligned(Element.ALIGN_RIGHT, text, x, y, 35);}}// 设置水印颜色waterMar.setColorFill(BaseColor.GRAY);//结束设置waterMar.endText();waterMar.stroke();
}