java - 如何使用java从pdf文件中读取原始文本

Question

我正在使用 pdf 框解析器使用 java 从 pdf 文件中读取数据。它将读取 pdf 文件中的所有内容。

下面是我从 pdf 文件中读取数据并将其存储到文本文件中的示例代码。示例代码：

public class PDFTextParser {
    PDFParser parser;
    String parsedText;
    PDFTextStripper pdfStripper;
    PDDocument pdDoc;
    PdfReader read;
    COSDocument cosDoc;
    PDDocumentInformation pdDocInfo;
    PdfTextExtractor extract;
    // PDFTextParser Constructor 
    public PDFTextParser() {
    }

    // Extract text from PDF Document
    String pdftoText(String fileName) {

        System.out.println("Parsing text from PDF file " + fileName + "....");
        File f = new File(fileName);

        if (!f.isFile()) {
            System.out.println("File " + fileName + " does not exist.");
            return null;
        }

        try {
            parser = new PDFParser(new FileInputStream(f));
        } catch (Exception e) {
            System.out.println("Unable to open PDF Parser.");
            return null;
        }

        try {
            parser.parse();
            cosDoc = parser.getDocument();
            pdfStripper = new PDFTextStripper();
            pdDoc = new PDDocument(cosDoc);
            parsedText = pdfStripper.getText(pdDoc); 

        } catch (Exception e) {
            System.out.println("An exception occured in parsing the PDF Document.");
            e.printStackTrace();
            try {
                   if (cosDoc != null) cosDoc.close();
                   if (pdDoc != null) pdDoc.close();
               } catch (Exception e1) {
               e.printStackTrace();
            }
            return null;
        }      
        System.out.println("Done.");
        return parsedText;
    }

    // Write the parsed text from PDF to a file
    void writeTexttoFile(String pdfText, String fileName) {

        System.out.println("\nWriting PDF text to output text file " + fileName + "....");
        try {
            PrintWriter pw = new PrintWriter(fileName);
            pw.print(pdfText);
            pw.close();     
        } catch (Exception e) {
            System.out.println("An exception occured in writing the pdf text to file.");
            e.printStackTrace();
        }
        System.out.println("Done.");
    }

    //Extracts text from a PDF Document and writes it to a text file
    public static void test() {


        String args[]={"C://Sample_Voice.pdf","C://CNP/Sample.txt"};
        if (args.length != 2) {
            System.out.println("Usage: java PDFTextParser <InputPDFFilename> <OutputTextFile>");
            System.exit(1);
        }

        PDFTextParser pdfTextParserObj = new PDFTextParser();
        String pdfToText = pdfTextParserObj.pdftoText(args[0]).replaceAll("®", "");
        if (pdfToText == null) {
            System.out.println("PDF to Text Conversion failed.");
        }
        else {
            System.out.println("\nThe text parsed from the PDF Document....\n" + pdfToText);
            pdfTextParserObj.writeTexttoFile(pdfToText, args[1]);
        }
    }  

    public static void main(String args[]) throws IOException
    {
        test();
    }
}

我的要求是只获取原始文本而不获取

1)header
2)footer
3)hiperlinks.

怎么做。请给我建议。

谢谢