iText Pdf页面字节大小 [英] iText Pdf Page Byte Size

问题描述

我有一项业务要求，要求我将pdf拆分为多个文档。
假设我有一个100MB的pdf，为了简单起见，我需要将其分成多个不超过10MB的pdf文件。

I have a business requirement that requires me to splits pdfs into multiple documents. Lets say I have a 100MB pdf, I need to split that into for simplicity sake, into multiple pdfs no larger than 10MB a piece.

我正在使用iText。

I am using iText.

我将获取原始的pdf，并循环浏览页面，但如何确定每个页面的文件大小而不将其单独写入磁盘？

I am going to get the original pdf, and loop through the pages, but how can I determine the file size of each page without writing it separately to the disk?

简单示例代码

int numPages = reader.getNumberOfPages();

PdfImportedPage page;
for (int currentPage = 0; currentPage < numPages; ){
    ++currentPage;
    //Get page from reader
    page = writer.getImportedPage(reader, currentPage);

// I need the size in bytes here of the page

}   

推荐答案

我认为最简单的方法是将其写入磁盘并在之后删除它：

I think the easiest way is to write it to the disk and delete it afterwards:

Document document = new Document();
File f= new File("C:\\delete.pdf");  //for instance
PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(f));
document.open();
document.add(page);
document.close();
long filesize = f.length();   //this is the filesize in byte
f.delete();

我承认，我不是很确定，但我不知道应该怎么做如果文件不存在，找出文件大小。

I'm not absolutely sure, I admit, but I don't know how it should be possible to figure out the filesize if the file is not existing.

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