java - iText 为 PDF 封面中的占位符动态添加值

Question

我有以下封面。我需要为 Licensee、date 添加值，并用给定的其他文本填写方框。如何使用 iText 完成此操作。任何帮助表示赞赏。

Answer 1

首先，您需要创建一个表单，作为您所有许可文件的模板。 Chapter 6 of "iText in Action" 的第 5.3.5 节(可以免费下载的一章)解释了如何使用 OpenOffice 创建这样的表单，但是有许多替代方法可以做到这一点。我使用 Adob​​e Acrobat 创建了这样一个表单:CertificateOfExcellence.pdf

我突出显示了这些字段，以便您可以看到我添加它们的位置。有四种:

• course: 14pt Helvetica 中的类(class)名称，居中对齐
• 姓名:Helvetica 学生姓名，左对齐
• date:Helvetica 类(class)的日期，左对齐
• 类(class)说明:Helvetica 学生姓名，左对齐，多行标志打开。

现在我可以轻松填写​​表格(参见 FillForm ):

public void manipulatePdf(String src, String dest) throws DocumentException, IOException {
    PdfReader reader = new PdfReader(src);
    PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(dest));
    AcroFields form = stamper.getAcroFields();
    form.setField("course", "Copying and Pasting from StackOverflow");
    form.setField("name", "Some dude on StackOverflow");
    form.setField("date", "April 10, 2016");
    form.setField("description",
        "In this course, people consistently ignore the existing documentation completely. "
        + "They are encouraged to do no effort whatsoever, but instead post their questions "
        + "on StackOverflow. It would be a mistake to refer to people completing this course "
        + "as developers. A better designation for them would be copy/paste artist. "
        + "Only in very rare cases do these people know what they are actually doing. "
        + "Not a single student has ever learned anything substantial during this course.");
    stamper.setFormFlattening(true);
    stamper.close();
}

生成的 PDF 如下所示:certificate.pdf

如您所见，代码非常简单。对于那些花时间阅读文档的人来说，所有这些都有很好的记录。也许您还可以查看标题为 Interactive forms 的部分在 official web site 上.