Java使用IText根据pdf模板创建pdf文件

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1.导包

 <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><dependency><groupId>commons-io</groupId><artifactId>commons-io</artifactId><version>2.11.0</version>
</dependency>

2.绘制pdf模板
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3.示例代码

/*** 读取pdf模板填充生成pdf文件并转为字节数组* @return*/
public byte[] createPdf() {//获取源数据(一般从数据库查询，此处通过构造数据简化处理)List<Plan> plans = this.getPlans();final int size = plans.size();//临时文件final String outputFilePath = "D:/" + System.currentTimeMillis() + ".pdf";OutputStream os = null;PdfStamper ps = null;PdfReader reader = null;PdfReader reader2 = null;Document document = null;ByteArrayOutputStream byteArrayOutputStream = null;PdfCopy pdfNew = null;try {//读入pdf表单reader = new PdfReader(this.getClass().getResourceAsStream("/template/test.pdf"));//根据表单生成一个新的pdfos = Files.newOutputStream(new File(outputFilePath).toPath());ps = new PdfStamper(reader, os);//获取pdf表AcroFields form = ps.getAcroFields();form.setField("contractNo", "HT2024042501");//合同号form.setField("paymentDate", "2022-12-01");//放款日期form.setField("expiredDate", "2023-12-01");//到期日期ps.setFormFlattening(true);List<AcroFields.FieldPosition> table = form.getFieldPositions("table");Rectangle rect = table.get(0).position;PdfPTable pTable = new PdfPTable(8);BaseFont bfChinese = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", false);Font fontZH = new Font(bfChinese, 10f, 0);pTable.getDefaultCell().setHorizontalAlignment(1);pTable.setWidthPercentage(100.0f);float totalWidth = rect.getRight() - rect.getLeft() - 1;//计算表格宽度float[] columnWidth = {(float) (totalWidth * 0.05), (float) (totalWidth * 0.15), (float) (totalWidth * 0.15), (float) (totalWidth * 0.15), (float) (totalWidth * 0.15), (float) (totalWidth * 0.13), (float) (totalWidth * 0.13), (float) (totalWidth * 0.09)};pTable.setTotalWidth(columnWidth);pTable.setLockedWidth(true);for (Plan plan : plans) {Integer periodNo = plan.getPeriodNo();int border = (periodNo % 12 == 0 || periodNo == size) ? Rectangle.BOTTOM : Rectangle.NO_BORDER;pTable.addCell(generateCell(String.valueOf(periodNo), border, fontZH));pTable.addCell(generateCell(plan.getMatchDate(), border, fontZH));pTable.addCell(generateCell(plan.getRepayOriginal(), border, fontZH));pTable.addCell(generateCell(plan.getPenalty(), border, fontZH));pTable.addCell(generateCell(plan.getRepayAmount(), border, fontZH));pTable.addCell(generateCell(plan.getRestOriginal(), border, fontZH));pTable.addCell(generateCell(plan.getRepayDate(), border, fontZH));pTable.addCell(generateCell(plan.getRepayStatus(), border, fontZH));}pTable.setKeepTogether(true);pTable.setSplitLate(false);pTable.setSplitRows(true);//计算需要分页的总页数int totalpage = size % 12 == 0 ? size / 12 : size / 12 + 1;if (totalpage == 1) {//获table页面PdfContentByte under = ps.getOverContent(1);//添加tablepTable.writeSelectedRows(0, -1, rect.getLeft(), rect.getTop(), under);} else {for (int i = 1; i <= totalpage; i++) {PdfContentByte under = ps.getOverContent(i);if (i == 1) {pTable.writeSelectedRows(0, 12, rect.getLeft(), rect.getTop(), under);} else {pTable.writeSelectedRows((i - 1) * 12, i * 12, rect.getLeft(), rect.getTop(), under);}}}ps.close();reader2 = new PdfReader(outputFilePath);document = new Document(reader2.getPageSizeWithRotation(1));byteArrayOutputStream = new ByteArrayOutputStream();pdfNew = new PdfCopy(document, byteArrayOutputStream);document.open();PdfImportedPage page;for (int i = 1; i <= totalpage; i++) {page = pdfNew.getImportedPage(reader2, i);pdfNew.addPage(page);}document.close();os.close();pdfNew.close();reader.close();reader2.close();FileUtils.delete(new File(outputFilePath));return byteArrayOutputStream.toByteArray();} catch (Exception e) {e.printStackTrace();} finally {try {if (ps != null) {ps.close();}if (reader != null) {reader.close();}if (os != null) {os.close();}if (document != null) {document.close();}if (pdfNew != null) {pdfNew.close();}if (reader2 != null) {reader2.close();}if (byteArrayOutputStream != null) {byteArrayOutputStream.close();}} catch (Exception e) {e.printStackTrace();}}return null;
}private List<Plan> getPlans() {List<Plan> plans = new ArrayList<Plan>();for(int i=1;i<=12;i++) {plans.add(new Plan(i,"2023-"+String.format("%02d", i)+"-01","999","-", "999","0","2023-"+String.format("%02d", i)+"-01", "已结清"));}return plans;
}private PdfPCell generateCell(String value, int border, Font fontZH) {PdfPCell cell = new PdfPCell(new Phrase(value, fontZH));cell.setBorder(border);cell.setHorizontalAlignment(Element.ALIGN_CENTER);return cell;}public static void main(String [] args) throws FileNotFoundException, IOException {//将字节流转为pdf文件放于D盘OutputStream fileOut = new FileOutputStream("D:/a.pdf");fileOut.write(new TestPdf().createPdf());}

4.执行结果
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5.所用到jar包下载地址：
itextpdf-5.5.10.jar