在Java編程中，如何使用java從PDF中提取內容？

項目的目錄結構如下 -

Tika的工具包可從以下網址下載：http://tika.apache.org/download.html ，只下載：tika-app-1.16.jar 和 tika-server-1.16.jar 。

以下是使用java從PDF中提取內容的程序 -

import java.io.File;

import java.io.FileInputStream;

import org.apache.tika.metadata.Metadata;

import org.apache.tika.parser.ParseContext;

import org.apache.tika.parser.pdf.PDFParser;

import org.apache.tika.sax.BodyContentHandler;

public class ExtractContentFromPDF {

public static void main(String[] args) throws Exception {

BodyContentHandler handler = new BodyContentHandler();

Metadata metadata = new Metadata();

FileInputStream inputstream = new FileInputStream(new File("pdfExample.pdf"));

ParseContext pcontext = new ParseContext();

// parsing the document using PDF parser

PDFParser pdfparser = new PDFParser();

pdfparser.parse(inputstream, handler, metadata, pcontext);

// getting the content of the document

System.out.println("Contents of the PDF :" + handler.toString());

// getting metadata of the document

System.out.println("Metadata of the PDF:");

String[] metadataNames = metadata.names();

for (String name : metadataNames) {

System.out.println(name + " : " + metadata.get(name));

}

}

}

原PDF文件：pdfExample.pdf 的內容如下 -

執行上面示例代碼，得到以下結果 -

SLF4J: Class path contains multiple SLF4J bindings.

SLF4J: Found binding in [jar:file:/F:/worksp/javaexamples/libs/tika_libs/tika-app-1.16.jar!/org/slf4j/impl/StaticLoggerBinder.class]

SLF4J: Found binding in [jar:file:/F:/worksp/javaexamples/libs/tika_libs/tika-server-1.16.jar!/org/slf4j/impl/StaticLoggerBinder.class]

SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.

SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]

九月 27, 2017 4:29:50 上午 org.apache.tika.config.InitializableProblemHandler$3 handleInitializableProblem

警告: JBIG2ImageReader not loaded. jbig2 files will be ignored

See http://pdfbox.apache.org/2.0/dependencies.html#jai-image-io

for optional dependencies.

TIFFImageWriter not loaded. tiff files will not be processed

See http://pdfbox.apache.org/2.0/dependencies.html#jai-image-io

for optional dependencies.

J2KImageReader not loaded. JPEG2000 files will not be processed.

See http://pdfbox.apache.org/2.0/dependencies.html#jai-image-io

for optional dependencies.

九月 27, 2017 4:29:50 上午 org.apache.tika.config.InitializableProblemHandler$3 handleInitializableProblem

警告: org.xerial's sqlite-jdbc is not loaded.

Please provide the jar on your classpath to parse sqlite files.

See tika-parsers/pom.xml for the correct version.

Contents of the PDF :

Apache Tika is a library that is used for document type detection and

content extraction from various file formats.

Internally, Tika uses various existing document parsers and

document type detection techniques to detect and extract data.

Using Tika, one can develop a universal type detector and content

extractor to extract both structured text as well as metadata from

different types of documents such as spreadsheets, text documents,

images, PDFs and even multimedia input formats to a certain extent.

Metadata of the PDF:

date : 2017-09-26T20:00:44Z

pdf:PDFVersion : 1.7

pdf:docinfo:title :

xmp:CreatorTool : WPS Office

Company :

Keywords :

access_permission:modify_annotations : true

access_permission:can_print_degraded : true

subject :

dc:creator : Administrator

dcterms:created : 2017-09-26T20:00:44Z

Last-Modified : 2017-09-26T20:00:44Z

dcterms:modified : 2017-09-26T20:00:44Z

dc:format : application/pdf; version=1.7

Last-Save-Date : 2017-09-26T20:00:44Z

pdf:docinfo:creator_tool : WPS Office

access_permission:fill_in_form : true

pdf:docinfo:keywords :

pdf:docinfo:modified : 2017-09-26T20:00:44Z

meta:save-date : 2017-09-26T20:00:44Z

pdf:encrypted : false

modified : 2017-09-26T20:00:44Z

pdf:docinfo:custom:SourceModified : D:20170927041644+08'16'

cp:subject :

pdf:docinfo:subject :

Content-Type : application/pdf

pdf:docinfo:creator : Administrator

creator : Administrator

meta:author : Administrator

dc:subject :

meta:creation-date : 2017-09-26T20:00:44Z

created : Tue Sep 26 16:00:44 BOT 2017

Comments :

access_permission:extract_for_accessibility : true

access_permission:assemble_document : true

xmpTPg:NPages : 1

Creation-Date : 2017-09-26T20:00:44Z

access_permission:extract_content : true

pdf:docinfo:custom:Company :

access_permission:can_print : true

SourceModified : D:20170927041644+08'16'

pdf:docinfo:custom:Comments :

meta:keyword :

Author : Administrator

producer :

access_permission:can_modify : true

pdf:docinfo:producer :

pdf:docinfo:created : 2017-09-26T20:00:44Z

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