blocks|key|4422160|text|iText和言论自由一样自由，而不是像啤酒一样自由。有关我们尝试过的业务模型的更多信息，请阅读http://lowagie.com/bumodels，以避免从MPL/LGPL切换到AGPL。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4422161|Q1:生成动态XFA表单只读|style|BOLD|4422162|对于最新版本的iText来说，这是一个无需考虑的问题，但在您使用的过时版本中却不受支持。请阅读http://lowagie.com/itext2，找出为什么不应该使用iText+4.2.0+(据我所知，这甚至不是一个官方版本；我知道，因为我负责每个iText版本)。也许你是在说iTextSharp。|4422163|Q2:扁平化动态XFA表单|4422164|如果您想要扁平化一个动态的XFA表单，您有两个选择:要么使用Adobe+(这将花费您一条手臂和一条腿)，要么使用iText的LiveCycle工作器(这是一个构建在F/OSS+iText之上的更便宜的封闭源产品)。考虑到这个产品的成本和工时，我认为你找不到像免费啤酒那样免费的解决方案。我一个人不知道任何这样的产品。|4422165|Q3:如何确定XFA表单是否为动态|4422166|这在我的书“行动中的iText-第二版”中作了解释。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()需要一个空密钥集。请参阅本例中的方法readFieldnames()。|CODE|4422167|entityMap|0|LINK|mutability|MUTABLE|url|http://lowagie.com/bumodels|1|http://lowagie.com/itext2^0|1B|R|0|0|0|E|0|1B|P|1|0|0|D|0|0|0|H|0|17|E|1P|4|1Y|B|2R|G|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@$A|13|B|14|1|15]]|C|$]]|$1|D|3|E|5|6|7|16|8|@$A|17|B|18|F|G]]|9|@]|C|$]]|$1|H|3|I|5|6|7|19|8|@]|9|@$A|1A|B|1B|1|1C]]|C|$]]|$1|J|3|K|5|6|7|1D|8|@$A|1E|B|1F|F|G]]|9|@]|C|$]]|$1|L|3|M|5|6|7|1G|8|@]|9|@]|C|$]]|$1|N|3|O|5|6|7|1H|8|@$A|1I|B|1J|F|G]]|9|@]|C|$]]|$1|P|3|Q|5|6|7|1K|8|@$A|1L|B|1M|F|R]|$A|1N|B|1O|F|R]|$A|1P|B|1Q|F|R]|$A|1R|B|1S|F|R]]|9|@]|C|$]]|$1|S|3|-4|5|6|7|1T|8|@]|9|@]|C|$]]]|T|$U|$5|V|W|X|C|$Y|Z]]|10|$5|V|W|X|C|$Y|11]]]]

iText is free as in free speech, not free as in free beer. Read <a href="http://lowagie.com/bumodels" rel="nofollow">http://lowagie.com/bumodels</a> for more info about the business models we've tried in order to avoid switching from the MPL/LGPL to the AGPL.

Q1: making dynamic XFA forms read-only

That's a no-brainer with the most recent version of iText, but not supported in the obsolete version you're using. Please read <a href="http://lowagie.com/itext2" rel="nofollow">http://lowagie.com/itext2</a> 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: flattening dynamic XFA forms

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.

Q3: how to find out if an XFA form is dynamic

This is explained in my book, "iText in Action - Second Edition." You already have half of the solution. Condition 1: <code>isXfaPresent()</code> needs to return <code>true</code>. Condition 2: <code>getFields()</code> needs to have an empty key set. See the method <code>readFieldnames()</code> in this example.

blocks|key|266656|text|为了添加Bruno的答案并提供C#示例代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|266657|PdfReader+reader+=+new+PdfReader(filePath);
XfaForm+xfa+=+new+XfaForm(reader);

//Check+if+PDF+file+contains+Dynamic+XFA+data
if+(xfa+!=+null+&&+xfa.XfaPresent+&&+xfa.Reader.AcroFields.Fields.Keys.Count+==+0)
{
+++MessageBox.Show("This+PDF+contains+Dynamic+XFA+data.");
}|code-block|syntax|javascript|266658|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

To add to Bruno's answer and to provide C# example code:

<pre><code>PdfReader reader = new PdfReader(filePath);
XfaForm xfa = new XfaForm(reader);

//Check if PDF file contains Dynamic XFA data
if (xfa != null &amp;&amp; xfa.XfaPresent &amp;&amp; xfa.Reader.AcroFields.Fields.Keys.Count == 0)
{
 MessageBox.Show("This PDF contains Dynamic XFA data.");
}
</code></pre>

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).

For regular AcroForms PDFs and static XFA forms, I can accomplish this by calling <a href="http://www.docjar.org/docs/api/com/lowagie/text/pdf/PdfStamper.html#setFormFlattening(boolean)" rel="nofollow noreferrer"><code>setFormFlattening(true)</code></a> on the PdfStamper instance. For dynamic XFA forms, I have to set an <code>access</code> attribute of the XDP's <code>field</code> node to be <code>readOnly</code>.

The problem is, how do I detect if a form is dynamic XFA? <a href="http://www.docjar.org/docs/api/com/lowagie/text/pdf/XfaForm.html#isXfaPresent" rel="nofollow noreferrer"><code>isXfaPresent</code></a> doesn't differentiate between static or dynamic XFA forms, so isn't useful.

Detect dynamic XFA with iText

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

文章

问答

视频

学习中心

腾讯云实验室

直播

竞赛

腾讯云代码分析专区

腾讯iOA零信任安全管理系统专区

腾讯云架构师技术同盟交流圈

腾讯云数据库专区

腾讯云顾问专区

腾讯云原生专区

腾讯混元专区

腾讯云TCE专区

腾讯云Lighthouse专区

腾讯云HAI专区

腾讯云Edgeone专区

腾讯云存储专区

腾讯云智能专区

腾讯轻联专区 

腾讯云开发专区

TAPD专区

腾讯轻量云游戏服专区

腾讯云最具价值专家

腾讯云架构师技术同盟

腾讯云创作之星

腾讯云开发者先锋

腾讯云代码助手

云原生构建

TAPD 敏捷项目管理

Cloud Studio

SDK中心

API中心

命令行工具

涵盖代码开发、场景应用、自动测试全流程，助你从零构建专属AI助手

一站式MCP教程库，解锁AI应用新玩法

我需要使预先填充的PDF/XFA表单只读(因为在没有输入的情况下，例如文本、复选框、单选按钮等可以更改它们的值)。对于常规的AcroForms PDF和静态XFA表单，我可以通过在PdfStamper实例上调用来实现这一点。对于动态XFA表单，我必须将XDP的field节点的field属性设置为readOnly。问题是...

问用iText检测动态XFA
EN

Stack Overflow用户

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问用iText检测动态XFAEN