如何使用java从pdf文件中获取原始文本

我有一些pdf文件，使用pdfbox我已将它们转换为文本并存储到文本文件中，现在从我要删除的文本文件

1. 超链接
2. 所有特殊字符
3. 空白行
4. 标题页脚的pdf文件
5. “1）”，“2）”，“a）”，“子弹”等

我想逐行获得有效的文本，如下所示：

我们提出了OntoGain，一种从纯文本中提取的多词概念术语进行本体学习的方法。 OntoGain遵循由不同处理层定义的本体学习过程。 在简单术语提取的基础上，通过聚类提取的概念来形成概念层次结构。 然后，衍生的术语分类法充满了非分类关系。 已经研究了几种不同的最先进的方法来实现每一层。 OntoGain基于多词术语概念，因为多词或复合词具有比普通单词词更加坚实和独特的语义。 我们选择了层次聚类方法和forms概念分析（FCA）算法来构建术语分类法。 此外，应用关联规则算法来揭示非分类关系。 还实现了一种尝试在关系概念之间执行最合适的泛化级别的方法。 为了显示概念certificate，实现了系统原型。 OntoGain允许使用Jena Semantic Web Frame-work1将派生的本体转换为OWL。 OntoGain应用于医学和计算机语料库这两个独立的数据源，并将其结果与Text2Onto（一种最先进的本体学习方法）获得的类似结果进行比较。 对11.5 CCD1.1结果的分析表明，OntoGain在精度方面比Text20nto表现更好，提取更正确的概念，而更有选择性地提取更少但更合理的概念。

我怎样才能做到这一点？

Answer 1

使用pdfbox我们可以实现这个目标

示例：

 public static void main(String args[]) { PDFParser parser = null; PDDocument pdDoc = null; COSDocument cosDoc = null; PDFTextStripper pdfStripper; String parsedText; String fileName = "E:\\Files\\Small Files\\PDF\\JDBC.pdf"; File file = new File(fileName); try { parser = new PDFParser(new FileInputStream(file)); parser.parse(); cosDoc = parser.getDocument(); pdfStripper = new PDFTextStripper(); pdDoc = new PDDocument(cosDoc); parsedText = pdfStripper.getText(pdDoc); System.out.println(parsedText.replaceAll("[^A-Za-z0-9. ]+", "")); } catch (Exception e) { e.printStackTrace(); try { if (cosDoc != null) cosDoc.close(); if (pdDoc != null) pdDoc.close(); } catch (Exception e1) { e.printStackTrace(); } } } 

Answer 2

您好我们可以使用Apache Tika提取pdf文件

例子是：

 import java.io.IOException; import java.io.InputStream; import java.util.HashMap; import java.util.Map; import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.client.methods.HttpGet; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.tika.metadata.Metadata; import org.apache.tika.metadata.TikaCoreProperties; import org.apache.tika.parser.AutoDetectParser; import org.apache.tika.parser.ParseContext; import org.apache.tika.sax.BodyContentHandler; public class WebPagePdfExtractor { public Map processRecord(String url) { DefaultHttpClient httpclient = new DefaultHttpClient(); Map map = new HashMap(); try { HttpGet httpGet = new HttpGet(url); HttpResponse response = httpclient.execute(httpGet); HttpEntity entity = response.getEntity(); InputStream input = null; if (entity != null) { try { input = entity.getContent(); BodyContentHandler handler = new BodyContentHandler(); Metadata metadata = new Metadata(); AutoDetectParser parser = new AutoDetectParser(); ParseContext parseContext = new ParseContext(); parser.parse(input, handler, metadata, parseContext); map.put("text", handler.toString().replaceAll("\n|\r|\t", " ")); map.put("title", metadata.get(TikaCoreProperties.TITLE)); map.put("pageCount", metadata.get("xmpTPg:NPages")); map.put("status_code", response.getStatusLine().getStatusCode() + ""); } catch (Exception e) { e.printStackTrace(); } finally { if (input != null) { try { input.close(); } catch (IOException e) { e.printStackTrace(); } } } } } catch (Exception exception) { exception.printStackTrace(); } return map; } public static void main(String arg[]) { WebPagePdfExtractor webPagePdfExtractor = new WebPagePdfExtractor(); Map extractedMap = webPagePdfExtractor.processRecord("http://math.about.com/library/q20.pdf"); System.out.println(extractedMap.get("text")); } } 

Answer 3

您可以使用iText进行此类操作

 //iText imports import com.itextpdf.text.pdf.PdfReader; import com.itextpdf.text.pdf.parser.PdfTextExtractor; 

例如：

 try { PdfReader reader = new PdfReader(INPUTFILE); int n = reader.getNumberOfPages(); String str=PdfTextExtractor.getTextFromPage(reader, 2); //Extracting the content from a particular page. System.out.println(str); reader.close(); } catch (Exception e) { System.out.println(e); } 

另一个

 try { PdfReader reader = new PdfReader("c:/temp/test.pdf"); System.out.println("This PDF has "+reader.getNumberOfPages()+" pages."); String page = PdfTextExtractor.getTextFromPage(reader, 2); System.out.println("Page Content:\n\n"+page+"\n\n"); System.out.println("Is this document tampered: "+reader.isTampered()); System.out.println("Is this document encrypted: "+reader.isEncrypted()); } catch (IOException e) { e.printStackTrace(); } 

以上示例只能提取文本，但您需要做更多工作来删除超链接，项目符号，标题和数字。

Answer 4

从本地计算机上的PDF文件或Base64编码的字符串中提取所有关键字：

  import org.apache.commons.codec.binary.Base64; import org.apache.pdfbox.pdmodel.PDDocument; import org.apache.pdfbox.text.PDFTextStripper; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.util.HashMap; import java.util.Map; public class WebPagePdfExtractor { public static void main(String arg[]) { WebPagePdfExtractor webPagePdfExtractor = new WebPagePdfExtractor(); System.out.println("From file: " + webPagePdfExtractor.processRecord(createByteArray()).get("text")); System.out.println("From string: " + webPagePdfExtractor.processRecord(getArrayFromBase64EncodedString()).get("text")); } public Map processRecord(byte[] byteArray) { Map map = new HashMap<>(); try { PDFTextStripper stripper = new PDFTextStripper(); stripper.setSortByPosition(false); stripper.setShouldSeparateByBeads(true); PDDocument document = PDDocument.load(byteArray); String text = stripper.getText(document); map.put("text", text.replaceAll("\n|\r|\t", " ")); } catch (Exception exception) { exception.printStackTrace(); } return map; } private static byte[] getArrayFromBase64EncodedString() { String encodedContent = "data:application/pdf;base64,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" + 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= new byte[(int) file.length()]; try { fin.read(fileContent); } catch (IOException e) { e.printStackTrace(); } return fileContent; } }