学步园

在做全文检索的处理中我们可能需要从非文本文件抽取文本内容。

pdf的话可以用pdfbox来实现。

例：

public static void main(String[] args) {
        String pdfFile = "c:/test.pdf";
        PDDocument doc;
        try {
            doc = PDDocument.load(pdfFile);
            PDFTextStripper stripper = new PDFTextStripper();
            System.out.print(stripper.getText(doc));
            doc.close();
        } catch (IOException e) {
            e.printStackTrace();
        }       
    }

office系列的话可以用poi来实现。

例：

FileInputStream fis = new FileInputStream(inputFile);
    POIFSFileSystem fileSystem = new POIFSFileSystem(fis);
    // Firstly, get an extractor for the Workbook
    POIOLE2TextExtractor oleTextExtractor =
       ExtractorFactory.createExtractor(fileSystem);
    // Then a List of extractors for any embedded Excel, Word, PowerPoint
    // or Visio objects embedded into it.
    POITextExtractor[] embeddedExtractors =
       ExtractorFactory.getEmbededDocsTextExtractors(oleTextExtractor);
    for (POITextExtractor textExtractor : embeddedExtractors) {
       // If the embedded object was an Excel spreadsheet.
       if (textExtractor instanceof ExcelExtractor) {
          ExcelExtractor excelExtractor = (ExcelExtractor) textExtractor;
          System.out.println(excelExtractor.getText());
       }
       // A Word Document
       else if (textExtractor instanceof WordExtractor) {
          WordExtractor wordExtractor = (WordExtractor) textExtractor;
          String[] paragraphText = wordExtractor.getParagraphText();
          for (String paragraph : paragraphText) {
             System.out.println(paragraph);
          }
          // Display the document's header and footer text
          System.out.println("Footer text: " + wordExtractor.getFooterText());
          System.out.println("Header text: " + wordExtractor.getHeaderText());
       }
       // PowerPoint Presentation.
       else if (textExtractor instanceof PowerPointExtractor) {
          PowerPointExtractor powerPointExtractor =
             (PowerPointExtractor) textExtractor;
          System.out.println("Text: " + powerPointExtractor.getText());
          System.out.println("Notes: " + powerPointExtractor.getNotes());
       }
       // Visio Drawing
       else if (textExtractor instanceof VisioTextExtractor) {
          VisioTextExtractor visioTextExtractor =
             (VisioTextExtractor) textExtractor;
          System.out.println("Text: " + visioTextExtractor.getText());
       }
    }