ITextRenderer:调整内容的页面高度 [英] ITextRenderer: Adjust page height to content

问题描述

我正在使用ITextRenderer从HTML生成PDF，我需要做的是收银机收据. 此收据具有动态宽度，当然还有动态内容.就是说，内容的高度总是不同的，现在我正在努力寻找一种调整PDF页面的高度以适应内容的方法. 如果收据太大，则收据的末尾会有一个长长的白色部分；如果要缩短，则将PDF分页，我只需要一页即可.

I'm using ITextRenderer to generate a PDF from HTML and what I need to do is a cash register receipt. This receipt has dynamic width and, of course, dynamic content. This said, the height of content will always be different and right now I'm struggling to find a way of adjusting the height of the PDF page to the content. If it's too big the receipt has a long white section in the end and if it's to short the PDF get's paginated and I need it to be in one page only.

我正在使用@page {size: Wpx Hpx;}设置页面大小，但是几乎不可能(非常痛苦)根据宽度和数据来计算内容高度.

I'm using @page {size: Wpx Hpx;} to set the page size, but it's almost impossible (would be very painful) to calculate the content height based on width and data.

这是生成PDF的代码:

This is the code that generates the PDF:

ITextRenderer renderer = new ITextRenderer();

byte[] bytes = htmlDocumentString.toString().getBytes("UTF-8");
ByteArrayInputStream bais = new ByteArrayInputStream(bytes);
DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
InputSource is = new InputSource(bais);
Document doc = builder.parse(is);

renderer.setDocument(doc, null);

renderer.layout();
renderer.createPDF(outputStream);
outputStream.flush();
outputStream.close();

我也尝试过renderer.getSharedContext().setPrint(false);，但这会引发NPE.

I've also tried renderer.getSharedContext().setPrint(false);, but this throws a NPE.

@page {-fs-page-sequence: "none";}也没有运气.

推荐答案

我发现的解决方案甚至还不完美，但是可行！

The solution I found is not even close to perfect, but works!

@page {
    size: Wpx 1px;
}
* { 
    page-break-inside: always; 
}

这将为整个内容生成1px页面.然后，我只需要告诉打印机打印所有页面，每页之间的空白为0px.

This will generate 1px pages for the entire content. Then I just have to tell the printer to print all the pages with 0px margin between pages.

为什么这种解决方案并不完美?通过3G流式传输时，文件大小从1或2KB到200KB.不是很好.

Why this solution is not perfect? The file size goes from 1 or 2KB to 200KB.. not very good, when streaming through 3G.

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