使用ContentHandler提取文件的内容

Question

I'm trying to extract the contents of a txt file using ContentHandler, the below is my code and the contents of my file is

Sample content Sample contentSample contentSample contentSample contentSample contentSample contentSample contentSample contentSample contentSample contentSample contentSample

The below code is not showing the extracted contents, what am I missing here?

class Test { 
private OutputStream outputstream;
private ParseContext context;
private Detector detector;
private Parser parser;
private Metadata metadata;
private String extractedText;

public Test() {
    context = new ParseContext();
    detector = new DefaultDetector();
    parser = new AutoDetectParser(detector);
    context.set(Parser.class, parser);
    outputstream = new ByteArrayOutputStream();
    metadata = new Metadata();
}

public void process(String filename) throws Exception {
    URL url;
    File file = new File(filename);
    if (file.isFile()) {
        url = file.toURI().toURL();
    } else {
        url = new URL(filename);
    }
    InputStream input = TikaInputStream.get(url, metadata);
    ContentHandler handler = new BodyContentHandler(outputstream);
    parser.parse(input, handler, metadata, context); 
    input.close();
}

public void getString() {
    //Get the text into a String object
    extractedText = outputstream.toString();
    //Do whatever you want with this String object.
    System.out.println("extracted text "+extractedText);
}

public static void main(String args[]) throws Exception {
    if (args.length == 1) {
        Test textExtractor = new Test();
        textExtractor.process("D:\\docs\\sample.txt");
        textExtractor.getString();
    } else { 
        throw new Exception();
    }
}
}

Answer 1

除了apache tika-core之外，还要添加apache tika-parsers依赖。