使用Java一次阅读pdf uploadstream一页 [英] Read pdf uploadstream one page at a time with java

问题描述

我正在尝试在j2ee应用程序中阅读pdf文档.

I am trying to read a pdf document in a j2ee application.

对于Web应用程序，我必须将pdf文档存储在磁盘上.为了使搜索容易，我想对文档中的文本进行反向索引；如果是OCR.

For a webapplication I have to store pdf documents on disk. To make searching easy I want to make a reverse index of the text inside the document; if it is OCR.

使用PDFbox库，可以创建一个包含整个pdf文件的pdfDocument对象.但是，为了保留内存并提高整体性能，我宁愿将文档作为流处理，并一次将一页读入缓冲区.

With the PDFbox library its possible to create a pdfDocument object wich contains an entire pdf file. However to preserve memory and improve overall performance I'd rather handle the document as a stream and read one page at a time into a buffer.

我想知道是否可以一次一页一页甚至一行地读取包含pdf的文件流.

I wonder if it is possible to read a filestream containing pdf page by page or even one line at a time.

推荐答案

在2.0.*版本中，如下所示打开PDF:

In the 2.0.* versions, open the PDF like this:

PDDocument doc = PDDocument.load(file, MemoryUsageSetting.setupTempFileOnly());

这将设置缓冲内存的使用，以仅使用没有限制大小的临时文件(无主内存).

This will setup buffering memory usage to only use temporary file(s) (no main-memory) with no restricted size.

在此处得到了答复.

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