blocks|key|3241869|text|我们比2008年更接近了，但还没有完全做到这一点。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3241870|最新开发版本的Prawn允许您使用现有的PDF作为模板，但不会在添加更多页面时重复使用模板。|3241871|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

We're closer than we were in 2008, but not quite there yet.

The latest dev version of Prawn lets you use an existing PDF as a template, but not use a template over and over as you add more pages.

blocks|key|302535|text|通过iText，这将会起作用...但是，您应该在合并表单之前将其展平，以避免字段名冲突。或者重命名字段，一次重命名一页。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|302536|在PDF中，具有相同名称的字段共享一个值。这通常不是我们想要的行为，尽管它有时会派上用场。|302537|类似于(在java中)的内容：|302538|PdfCopy+mergedPDF+=+new+PdfCopy(+new+Document(),+new+FileOutputStream(+outPath+);

for+(String+path+:+paths+)+{
++PdfReader+reader+=+new+PdfReader(+path+);
++ByteArrayOutputStream+curFormOut+=+new+ByteArrayOutputStream();
++PdfStamper+stamper+=+new+PdfStamper(+reader,+curFormOut+);

++stamper.setField(+name,+value+);+//+ad+nauseum

++stamper.setFlattening(true);+//+flattening+setting+only+takes+effect+during+close()
++stamper.close();

++byte+curFormBytes+=+curFormOut.toByteArray();
++PdfReader+combineMe+=+new+PdfReader(+curFormBytes+);

++int+pages+=+combineMe+.getNumberOfPages();
++for+(int+i+=+1;+i+<=+pages;+%2B%2Bi)+{+//+"1"+is+the+first+page
++++mergedForms.addPage(+mergedForms.getImportedPage(+combineMe,+i+);
++}
}

mergedForms.close();|code-block|syntax|javascript|302539|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|O|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|P|8|@]|9|@]|A|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Via iText, this will work... though you should flatten the forms before you merge them to avoid field name conflicts. That or rename the fields one page at a time.

Within PDF, fields with the same name share a value. This is usually not the desired behavior, though it comes in handy from time to time.

Something along the lines of (in java):

<pre><code>PdfCopy mergedPDF = new PdfCopy( new Document(), new FileOutputStream( outPath );

for (String path : paths ) {
 PdfReader reader = new PdfReader( path );
 ByteArrayOutputStream curFormOut = new ByteArrayOutputStream();
 PdfStamper stamper = new PdfStamper( reader, curFormOut );

 stamper.setField( name, value ); // ad nauseum

 stamper.setFlattening(true); // flattening setting only takes effect during close()
 stamper.close();

 byte curFormBytes = curFormOut.toByteArray();
 PdfReader combineMe = new PdfReader( curFormBytes );

 int pages = combineMe .getNumberOfPages();
 for (int i = 1; i &lt;= pages; ++i) { // "1" is the first page
 mergedForms.addPage( mergedForms.getImportedPage( combineMe, i );
 }
}

mergedForms.close();
</code></pre>

blocks|key|3027580|text|为此，我编写了一个ruby+gem+-+PDF::Merger。它使用iText。下面是你如何使用它：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3027581|pdf+=+PDF::Merger.new
pdf.add_file+"foo.pdf"
pdf.add_file+"bar.pdf"
pdf.save_as+"combined.pdf"|code-block|syntax|javascript|3027582|entityMap|0|LINK|mutability|MUTABLE|url|http://github.com/paulschreiber/pdf-merger^0|K|B|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

I wrote a ruby gem to do this — <a href="http://github.com/paulschreiber/pdf-merger" rel="noreferrer">PDF::Merger</a>. It uses iText. Here's how you use it:

<pre><code>pdf = PDF::Merger.new
pdf.add_file "foo.pdf"
pdf.add_file "bar.pdf"
pdf.save_as "combined.pdf"
</code></pre>

blocks|key|300176|text|使用ghostscript合并PDF：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|300177|+options+=+"-q+-dNOPAUSE+-dBATCH+-sDEVICE=pdfwrite"
+system+"gs+#{options}+-sOutputFile=result.pdf+file1.pdf+file2.pdf"|code-block|syntax|javascript|300178|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|$]]

Use ghostscript to combine PDFs:

<pre><code> options = "-q -dNOPAUSE -dBATCH -sDEVICE=pdfwrite"
 system "gs #{options} -sOutputFile=result.pdf file1.pdf file2.pdf"
</code></pre>

blocks|key|300180|text|从2013年开始，你可以使用Prawn来合并pdf。要点：https://gist.github.com/4512859|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|300181|class+PdfMerger

++def+merge(pdf_paths,+destination)

++++first_pdf_path+=+pdf_paths.delete_at(0)

++++Prawn::Document.generate(destination,+:template+=>+first_pdf_path)+do+%7Cpdf%7C

++++++pdf_paths.each+do+%7Cpdf_path%7C
++++++++pdf.go_to_page(pdf.page_count)

++++++++template_page_count+=+count_pdf_pages(pdf_path)
++++++++(1..template_page_count).each+do+%7Ctemplate_page_number%7C
++++++++++pdf.start_new_page(:template+=>+pdf_path,+:template_page+=>+template_page_number)
++++++++end
++++++end

++++end

++end

++private

++def+count_pdf_pages(pdf_file_path)
++++pdf+=+Prawn::Document.new(:template+=>+pdf_file_path)
++++pdf.page_count
++end

end|code-block|syntax|javascript|300182|entityMap|0|LINK|mutability|MUTABLE|url|https://gist.github.com/4512859^0|T|V|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

As of 2013 you can use Prawn to merge pdfs. Gist: <a href="https://gist.github.com/4512859" rel="noreferrer">https://gist.github.com/4512859</a>

<pre><code>class PdfMerger

 def merge(pdf_paths, destination)

 first_pdf_path = pdf_paths.delete_at(0)

 Prawn::Document.generate(destination, :template =&gt; first_pdf_path) do |pdf|

 pdf_paths.each do |pdf_path|
 pdf.go_to_page(pdf.page_count)

 template_page_count = count_pdf_pages(pdf_path)
 (1..template_page_count).each do |template_page_number|
 pdf.start_new_page(:template =&gt; pdf_path, :template_page =&gt; template_page_number)
 end
 end

 end

 end

 private

 def count_pdf_pages(pdf_file_path)
 pdf = Prawn::Document.new(:template =&gt; pdf_file_path)
 pdf.page_count
 end

end
</code></pre>

blocks|key|302548|text|我还没有在Ruby中看到很好的选择--我在上得到了最好的结果|type|unstyled|depth|inlineStyleRanges|entityRanges|data|302549|system+"pdftk+#{file_1}+multistamp+#{file_2}+output+#{file_combined}"|code-block|syntax|javascript|302550|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|$]]

Haven't seen great options in Ruby- I got best results shelling out to <a href="http://www.pdflabs.com/tools/pdftk-server/" rel="nofollow">pdftk</a>:

<pre><code>system "pdftk #{file_1} multistamp #{file_2} output #{file_combined}"
</code></pre>

blocks|key|3241941|text|在花了很长时间寻找纯Ruby解决方案之后，我最终从头开始编写代码来解析和合并PDF文件。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3241942|(我觉得现在的工具太乱了--我想要一些原生，但它们似乎都有不同的问题和依赖关系……即使是对虾也放弃了他们曾经拥有的模板支持)|offset|length|style|BOLD|3241943|我发布了gem+online，你也可以在GitHub上找到它。|3241944|您可以使用以下命令进行安装：|3241945|gem+install+combine_pdf|code-block|syntax|javascript|3241946|它非常容易使用(无论是否将PDF数据保存到文件)。|3241947|例如，下面是一个“一行”：|3241948|(CombinePDF.load("file1.pdf")+<<+CombinePDF.load("file2.pdf")+<<+CombinePDF.load("file3.pdf")).save("out.pdf")|3241949|如果你发现任何问题，请让我知道，我会努力修复。|3241950|entityMap|0|LINK|mutability|MUTABLE|url|https://rubygems.org/gems/combine_pdf|1|https://github.com/boazsegev/combine_pdf^0|0|J|2|0|8|6|0|K|6|1|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|18|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|19|8|@$D|1A|E|1B|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|1C|8|@]|9|@$D|1D|E|1E|1|1F]|$D|1G|E|1H|1|1I]]|A|$]]|$1|J|3|K|5|6|7|1J|8|@]|9|@]|A|$]]|$1|L|3|M|5|N|7|1K|8|@]|9|@]|A|$O|P]]|$1|Q|3|R|5|6|7|1L|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|1M|8|@]|9|@]|A|$]]|$1|U|3|V|5|N|7|1N|8|@]|9|@]|A|$O|P]]|$1|W|3|X|5|6|7|1O|8|@]|9|@]|A|$]]|$1|Y|3|-4|5|6|7|1P|8|@]|9|@]|A|$]]]|Z|$10|$5|11|12|13|A|$14|15]]|16|$5|11|12|13|A|$14|17]]]]

After a long search for a pure Ruby solution, I ended up writing code from scratch to parse and combine/merge PDF files.

(I feel it is such a mess with the current tools - I wanted something native but they all seem to have different issues and dependencies... even Prawn dropped the template support they use to have)

I posted the gem <a href="https://rubygems.org/gems/combine_pdf">online</a> and you can find it at <a href="https://github.com/boazsegev/combine_pdf">GitHub</a> as well.

you can install it with:

<pre><code>gem install combine_pdf
</code></pre>

It's very easy to use (with or without saving the PDF data to a file).

For example, here is a "one-liner":

<pre><code>(CombinePDF.load("file1.pdf") &lt;&lt; CombinePDF.load("file2.pdf") &lt;&lt; CombinePDF.load("file3.pdf")).save("out.pdf")
</code></pre>

If you find any issues, please let me know and I will work on a fix.

blocks|key|300220|text|如果你想使用combine_pdf+gem添加任何模板(由macOS页面或谷歌文档创建)，那么你可以尝试这样做：|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|300221|final_pdf+=+CombinePDF.new
company_template+=+CombinePDF.load(template_file.pdf).pages[0]
pdf+=+CombinePDF.load+(content_file.pdf)
pdf.pages.each+{%7Cpage%7C+final_pdf+<<+(company_template+<<+page)}+
final_pdf.save+"final_document.pdf"|code-block|syntax|javascript|300222|entityMap^0|6|F|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

If you want to add any template (created by macOS Pages or Google Docs) using the combine_pdf gem then you can try with this:

<pre><code>final_pdf = CombinePDF.new
company_template = CombinePDF.load(template_file.pdf).pages[0]
pdf = CombinePDF.load (content_file.pdf)
pdf.pages.each {|page| final_pdf &lt;&lt; (company_template &lt;&lt; page)} 
final_pdf.save "final_document.pdf"
</code></pre>

This was <a href="https://stackoverflow.com/questions/85459/is-it-possible-to-combine-a-series-of-pdfs-into-one-using-ruby">asked in 2008</a>. Hopefully there's a better answer now.

How can you combine PDFs in ruby?

I'm using the <a href="http://github.com/spatialnetworks/pdf-stamper" rel="nofollow noreferrer">pdf-stamper gem</a> to fill out a form in a PDF. I'd like to take n PDFs, fill out a form in each of them, and save the result as an n-page document.

Can you do this with a native library like prawn? Can you do this with rjb and iText? pdf-stamper is a wrapper on iText.

I'd like to avoid using two libraries (i.e. pdftk and iText), if possible.

How do you combine PDFs in ruby?

这是。希望现在有更好的答案。如何在ruby中组合PDF？我正在使用在PDF中填写表单。我想取n个PDF，在每个PDF中填写一张表格，然后将结果保存为n页文档。你能用像对虾这样的原生库做到这一点吗？你能用rjb和iText做到这一点吗？pdf-stamper是iText上的一个包装器。如果可能的话，我想避免使用两个库(即...

问如何在ruby中组合PDF？
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