tika提取pdf信息异常

dickrong

org.apache.tika.sax.WriteOutContentHandler$WriteLimitReachedException: Your document contained more than 100000 characters, and so your requested limit has been reached. To receive the full text of the document, increase your limit. (Text up to the limit is however available).
at org.apache.tika.sax.WriteOutContentHandler.characters(WriteOutContentHandler.java:141)
at org.apache.tika.sax.ContentHandlerDecorator.characters(ContentHandlerDecorator.java:146)
at org.apache.tika.sax.xpath.MatchingContentHandler.characters(MatchingContentHandler.java:85)
at org.apache.tika.sax.ContentHandlerDecorator.characters(ContentHandlerDecorator.java:146)
at org.apache.tika.sax.ContentHandlerDecorator.characters(ContentHandlerDecorator.java:146)
at org.apache.tika.sax.SafeContentHandler.access$001(SafeContentHandler.java:46)
at org.apache.tika.sax.SafeContentHandler$1.write(SafeContentHandler.java:82)
at org.apache.tika.sax.SafeContentHandler.filter(SafeContentHandler.java:140)
at org.apache.tika.sax.SafeContentHandler.characters(SafeContentHandler.java:287)
at org.apache.tika.sax.XHTMLContentHandler.characters(XHTMLContentHandler.java:278)
at org.apache.tika.sax.XHTMLContentHandler.characters(XHTMLContentHandler.java:305)
at org.apache.tika.parser.pdf.PDF2XHTML.writeString(PDF2XHTML.java:398)
at org.apache.pdfbox.util.PDFTextStripper.writeString(PDFTextStripper.java:866)
at org.apache.pdfbox.util.PDFTextStripper.writeLine(PDFTextStripper.java:1896)
at org.apache.pdfbox.util.PDFTextStripper.writePage(PDFTextStripper.java:744)
at org.apache.pdfbox.util.PDFTextStripper.processPage(PDFTextStripper.java:461)
at org.apache.pdfbox.util.PDFTextStripper.processPages(PDFTextStripper.java:385)
at org.apache.pdfbox.util.PDFTextStripper.writeText(PDFTextStripper.java:344)
at org.apache.tika.parser.pdf.PDF2XHTML.process(PDF2XHTML.java:130)
at org.apache.tika.parser.pdf.PDFParser.parse(PDFParser.java:159)

　　在使用apache tika提取pdf信息时，报以上错误。根据错误信息提示，可能读取超过请求限制（10万字）。
　　我的代码如下：



Parser parser = new PDFParser();
//parser.
BodyContentHandler handler = new BodyContentHandler();
Metadata metadata = new Metadata();
InputStream stream = null;
try {
stream = new FileInputStream(new File("1.pdf"));
parser.parse(stream, handler, metadata, new ParseContext());
for (String name : metadata.names()) {
System.out.println(name + ":\t" + metadata.get(name));
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SAXException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (TikaException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
try {
stream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

　　对读取字数限制，可能在某个构造函数里我没有传入最大限制，而使用了默认的十万字。检查一下上面的代码，我注意到了

BodyContentHandler的构造函数：


org.apache.tika.sax.BodyContentHandler.BodyContentHandler(int writeLimit)

　　看样子有关系。修改一下构造函数的数字为：10*1024*1024（这个数字有pdf文档大小决定）。
　　重新调试程序，即可获得pdf的元数据信息如下：



dc:subject:
meta:save-date:2014-07-22T21:02:38Z
subject:PostgreSQL 9.3 Documentation
Author:The PostgreSQL Global Development Group
dcterms:created:2014-07-22T20:55:33Z
date:2014-07-22T21:02:38Z
creator:The PostgreSQL Global Development Group
Creation-Date:2014-07-22T20:55:33Z
title:PostgreSQL 9.3 Documentation
trapped:False
meta:author:The PostgreSQL Global Development Group
created:Wed Jul 23 04:55:33 CST 2014
meta:keyword:
cp:subject:PostgreSQL 9.3 Documentation
dc:format:application/pdf; version=1.4
PTEX.Fullbanner:This is pdfTeX, Version 3.1415926-2.4-1.40.13 (TeX Live 2012/Debian) kpathsea version 6.1.0
xmp:CreatorTool:LaTeX with hyperref package
Keywords:
dc:title:PostgreSQL 9.3 Documentation
Last-Save-Date:2014-07-22T21:02:38Z
meta:creation-date:2014-07-22T20:55:33Z
dcterms:modified:2014-07-22T21:02:38Z
dc:creator:The PostgreSQL Global Development Group
pdf:PDFVersion:1.4
Last-Modified:2014-07-22T21:02:38Z
modified:2014-07-22T21:02:38Z
xmpTPg:NPages:2861
pdf:encrypted:false
producer:pdfTeX-1.40.13; modified using iText® 5.1.3 ©2000-2011 1T3XT BVBA
Content-Type:application/pdf