问题描述
我需要将预先填充的PDF / XFA表单设为只读（因为没有输入，例如文本，复选框，单选按钮等可以更改其值）。
I need to make pre-populated PDF/XFA forms read-only (as in no inputs, such as text, checkboxes, radio buttons etc. can have their values changed).
对于常规的AcroForms PDF和静态XFA表单，我可以通过调用。对于动态XFA表单，我必须将XDP的字段节点的 access 属性设置为 readOnly 。
For regular AcroForms PDFs and static XFA forms, I can accomplish this by calling setFormFlattening(true) on the PdfStamper instance. For dynamic XFA forms, I have to set an access attribute of the XDP's field node to be readOnly.
问题是，我如何检测表单是否动态 XFA？ 不区分静态或动态XFA表单，因此无用。
The problem is, how do I detect if a form is dynamic XFA? isXfaPresent doesn't differentiate between static or dynamic XFA forms, so isn't useful.
推荐答案
iText在言论自由中是免费的，不像免费啤酒那样免费。阅读，了解我们为避免商业模式所做的商业模式的更多信息从MPL / LGPL切换到AGPL。
iText is free as in free speech, not free as in free beer. Read http://lowagie.com/bumodels for more info about the business models we've tried in order to avoid switching from the MPL/LGPL to the AGPL.
Q1：将动态XFA表格设为只读
对于最新版本的iText，这是一个明智的选择，但在您使用的过时版本中不受支持。请阅读，了解不应使用iText 4.2.0的原因（据我所知，它甚至不是官方版本;我知道，因为我负责每一个iText版本）。也许你在谈论iTextSharp。
That's a no-brainer with the most recent version of iText, but not supported in the obsolete version you're using. Please read http://lowagie.com/itext2 to find out why you shouldn't use iText 4.2.0 (which as far as I know isn't even an official release; and I know, because I'm responsible for every single iText release). Maybe you're talking about iTextSharp.
Q2：展平动态XFA表格
如果您想要展平动态XFA表单，您有两种选择：使用Adobe LiveCycle ES（这将花费你的手臂和腿），或者使用iText的XFA Worker（这是一个便宜得多的闭源产品） F / OSS iText的顶部）。鉴于此产品的成本和工时数，我认为您不会找到像免费啤酒那样免费的解决方案。我不知道有任何此类产品。
If you want to flatten a dynamic XFA form, you have two options: either use Adobe LiveCycle ES (which will cost you an arm and a leg), or use iText's XFA Worker (which is a much less expensive closed source product built on top of the F/OSS iText). Given the cost and the number of man hours that went into this product, I don't think you'll find a solution that is free as in free beer. I for one don't know of any such product.
问题3：如何确定XFA表格是否动态
我的书iText in Action - Second Edition对此进行了解释。你已经有了一半的解决方案。条件1： isXfaPresent（）需要返回 true 。条件2： getFields（）需要有一个空键集。请参阅此示例中的方法 readFieldnames（）。
This is explained in my book, "iText in Action - Second Edition." You already have half of the solution. Condition 1: isXfaPresent() needs to return true. Condition 2: getFields() needs to have an empty key set. See the method readFieldnames() in this example.
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