Java iText5组件生成PDF文件

1. 使用Adobe Acrobat Pro DC工具， 在准备表单模式下，先设置好表单域

   
   Adobe Acrobat Pro 表单模式

2. 引入iText依赖, 目前iText5版本较为稳定

<!-- Adobe iText 5 -->
    <dependency>
      <groupId>com.itextpdf</groupId>
      <artifactId>itextpdf</artifactId>
      <version>5.5.13</version>
    </dependency>
    <dependency>
      <groupId>com.itextpdf</groupId>
      <artifactId>itext-asian</artifactId>
      <version>5.2.0</version>
    </dependency>
    <dependency>
      <groupId>org.bouncycastle</groupId>
      <artifactId>bcprov-jdk15on</artifactId>
      <version>1.49</version>
    </dependency>
    <dependency>
      <groupId>org.bouncycastle</groupId>
      <artifactId>bcpkix-jdk15on</artifactId>
      <version>1.49</version>
    </dependency>
    <!-- // Adobe iText 5 -->

3. 代码开发片段

       ......
        PdfReader reader = null;
        PdfStamper stamper;
        ByteArrayOutputStream bos = null;
        try {
            reader = new PdfReader("模板文件路径");
            bos = new ByteArrayOutputStream();
            stamper = new PdfStamper(reader, bos);

            AcroFields form = stamper.getAcroFields();
            
            # templateInfo.getDataMap(), 根据表单字段传入数据集(K-V)
            for (String fieldName : form.getFields().keySet()) {
                form.setField(fieldName, templateInfo.getDataMap().get(fieldName));
            }

            stamper.setFormFlattening(true);
            stamper.close();

            Document newDocument = new Document();
            PdfCopy copy = new PdfCopy(newDocument, outputStream);
            # 允许浏览, 不可编辑
            copy.setEncryption(null, null, PdfWriter.ALLOW_SCREENREADERS ,PdfWriter.ENCRYPTION_AES_128);
            # 允许打印
            copy.setEncryption(null, null, PdfWriter.ALLOW_PRINTING ,PdfWriter.ENCRYPTION_AES_128);
            newDocument.open();
            int pageSize = reader.getNumberOfPages();
            for(int cur = 0; cur < pageSize; cur ++) {
                copy.addPage(copy.getImportedPage(new PdfReader(bos.toByteArray()), cur + 1));
            }

            newDocument.close();

        } catch (Exception e) {
            logger.error("PDF build error, caused by ", e);
            throw new PDFBuilderException("PDF build error.");
        } finally {
            if(reader != null) {
                reader.close();
            }
            try {
                if (bos != null) {
                    bos.close();
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }