是否可以使用Apache Tika逐页提取word/pdf文件的文本? [英] Is it possible to extract text by page for word/pdf files using Apache Tika?

问题描述

我可以找到的所有文档似乎都建议我只能提取整个文件的内容.但是我需要分别提取页面.我需要为此编写自己的解析器吗?我缺少一些明显的方法吗?

All the documentation I can find seems to suggest I can only extract the entire file's content. But I need to extract pages individually. Do I need to write my own parser for that? Is there some obvious method that I am missing?

推荐答案

实际上，Tika确实通过在页面开始之前发送元素<div><p>在页面结束之后发送</p></div>来处理页面(至少以pdf格式).您可以使用以下方法在处理程序中轻松设置页数(仅使用<p>来计数页数):

Actually Tika does handle pages (at least in pdf) by sending elements <div><p> before page starts and </p></div> after page ends. You can easily setup page count in your handler using this (just counting pages using only <p>):

public abstract class MyContentHandler implements ContentHandler {
    private String pageTag = "p";
    protected int pageNumber = 0;
    ...
    @Override
    public void startElement (String uri, String localName, String qName, Attributes atts) throws SAXException  {  

        if (pageTag.equals(qName)) {
            startPage();
        }
    }

    @Override
    public void endElement (String uri, String localName, String qName) throws SAXException {  

        if (pageTag.equals(qName)) {
            endPage();
        }
    }

    protected void startPage() throws SAXException {
    pageNumber++;
    }

    protected void endPage() throws SAXException {
    return;
    }
    ...
}

使用pdf进行此操作时，如果解析器未按正确的顺序发送文本行，则可能会遇到问题-请参见

When doing this with pdf you may run into the problem when parser doesn't send text lines in proper order - see Extracting text from PDF files with Apache Tika 0.9 (and PDFBox under the hood) on how to handle this.

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