使用Apache Tika删除PDFont缓存 [英] Remove PDFont caching with Apache tika

问题描述

我正在尝试仅从许多不同的代码(rtf doc pdf)中提取文本.我自然而然地求助于Apache Tika，因为它可以自动检测文档并相应地提取文本.我只对文本感兴趣，而不对格式感兴趣.

我的应用程序最终出现大量内存泄漏，在进行调查时，这来自于PDFBox依赖项中PDFFont类的缓存.我对从PDF缓存Fontmetrics和其他Font格式问题不感兴趣，因为我只想提取文本.

我正在使用tika 1.12.有谁知道如何解决这个棘手的问题.这就是我使用自动检测的方式:

        AutoDetectParser parser = new AutoDetectParser();

        BodyContentHandler handler = new BodyContentHandler(-1);
        Metadata metadata = new Metadata();
        FileInputStream inputstream = new FileInputStream(new File(child.getPath()));
        ParseContext context = new ParseContext();              
        parser.parse(inputstream, handler, metadata, context);
        String s=null;
        s =handler.toString();
        handler=null;
        context=null;
        inputstream.close();
        PDFont.clearResources();

解决方案

所以我捏造了一个变通办法，每次文件处理完毕后都调用System.gc();，可以正常使用，但是并不能真正回答问题.

I am trying to extract text only from a number of different coduments (rtf doc pdf). I naturally turned to Apache Tika because it can autodetect the document and extract text accordingly. I am only interested in the text and not formatting etc.

My application ends up with a big memory leak and on investigating it, this is coming from caching from PDFFont class from the PDFBox dependency. I am not interesting in caching Fontmetrics and other Font formatting issues from pdfs as I want to only extract the text.

I am using tika 1.12. Does anyone know how to get around this cahcing issue. This is how I am using Autodetect:

        AutoDetectParser parser = new AutoDetectParser();

        BodyContentHandler handler = new BodyContentHandler(-1);
        Metadata metadata = new Metadata();
        FileInputStream inputstream = new FileInputStream(new File(child.getPath()));
        ParseContext context = new ParseContext();              
        parser.parse(inputstream, handler, metadata, context);
        String s=null;
        s =handler.toString();
        handler=null;
        context=null;
        inputstream.close();
        PDFont.clearResources();

解决方案

So I fudged a workaround and just called System.gc(); everytime the file had finished being processed which works a treat but doesn't really answer the question.

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