Java TikaInputStream.getFile方法代碼示例

import org.apache.tika.io.TikaInputStream; //導入方法依賴的package包/類
/**
 * There seems to be some sort of issue with some downstream
 *  3rd party libraries, and input streams that come from
 *  a {@link ContentReader}. This happens most often with
 *  JPEG and Tiff files.
 * For these cases, buffer out to a local file if not
 *  already there
 */
protected InputStream getInputStream(ContentReader reader) throws IOException
{
   // Prefer the File if available, it's generally quicker
   if(reader instanceof FileContentReader) 
   {
      return TikaInputStream.get( ((FileContentReader)reader).getFile() );
   }
   
   // Grab the InputStream for the Content
   InputStream input = reader.getContentInputStream();
   
   // Images currently always require a file
   if(MimetypeMap.MIMETYPE_IMAGE_JPEG.equals(reader.getMimetype()) ||
      MimetypeMap.MIMETYPE_IMAGE_TIFF.equals(reader.getMimetype())) 
   {
      TemporaryResources tmp = new TemporaryResources();
      TikaInputStream stream = TikaInputStream.get(input, tmp);
      stream.getFile(); // Have it turned into File backed
      return stream;
   }
   else
   {
      // The regular Content InputStream should be fine
      return input; 
   }
}
 

import org.apache.tika.io.TikaInputStream; //導入方法依賴的package包/類
/**
 * Parsa lo stream
 * @param stream stream
 * @param handler handler
 * @param metadata metadata
 * @param context contesto
 * @throws IOException eccezione
 * @throws SAXException eccezione
 * @throws TikaException  eccezione
 */
@Override
public void parse(InputStream stream, ContentHandler handler, Metadata metadata, ParseContext context)
        throws IOException, SAXException, TikaException {
    TesseractOCRConfig config = context.get(TesseractOCRConfig.class, DEFAULT_CONFIG);

    // If Tesseract is not on the path with the current config, do not try to run OCR
    // getSupportedTypes shouldn't have listed us as handling it, so this should only
    //  occur if someone directly calls this parser, not via DefaultParser or similar
    if (!hasTesseract(config)) {
        return;
    }

    XHTMLContentHandler xhtml = new XHTMLContentHandler(handler, metadata);

    TemporaryResources tmp = new TemporaryResources();
    File output = null;
    try {
        TikaInputStream tikaStream = TikaInputStream.get(stream, tmp);
        File input = tikaStream.getFile();
        long size = tikaStream.getLength();

        if (size >= config.getMinFileSizeToOcr() && size <= config.getMaxFileSizeToOcr()) {

            output = tmp.createTemporaryFile();
            doOCR(input, output, config);

            // Tesseract appends .txt to output file name
            output = new File(output.getAbsolutePath() + ".txt");

            if (output.exists()) {
                extractOutput(new FileInputStream(output), xhtml);
            }

        }

        // Temporary workaround for TIKA-1445 - until we can specify
        //  composite parsers with strategies (eg Composite, Try In Turn),
        //  always send the image onwards to the regular parser to have
        //  the metadata for them extracted as well
        _TMP_IMAGE_METADATA_PARSER.parse(tikaStream, handler, metadata, context);
    } finally {
        tmp.dispose();
        if (output != null) {
            output.delete();
        }
    }
}