java - Javaでpdfboxを使用してpdfファイルからヘッダーとフッターを削除する方法

Question

私はPDFパーサーを使用してPDFをテキストに変換しています。以下は、Javaを使用してPDFをテキストファイルに変換するコードです。私のPDFファイルには次のデータが含まれています：

    Data Sheet(Header)
    PHP Courses for PHP Professionals(Header)

   Networking Academy
    We live in an increasingly connected world, creating a global economy and a growing need for technical skills.  Networking Academy delivers information technology skills to over 500,000 students a year in more than 165 countries worldwide. Networking Academy students have the opportunity to participate in a powerful and consistent learning experience that is supported by high quality, online curricula and assessments, instructor training, hands-on labs, and classroom interaction. This experience ensures the same level of qualifications and skills regardless of where in the world a student is located.

    All copyrights reserved.(Footer).

サンプルコード:

public class PDF_TEST {
    PDFParser parser;
    String parsedText;
    PDFTextStripper pdfStripper;
    PDDocument pdDoc;
    COSDocument cosDoc;
    PDDocumentInformation pdDocInfo;

    // PDFTextParser Constructor 
    public PDF_TEST() {
    }

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


        File f = new File(fileName);

        if (!f.isFile()) {

            return null;
        }

        try {
            parser = new PDFParser(new FileInputStream(f));
        } catch (Exception e) {

            return null;
        }

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

            e.printStackTrace();
            try {
                   if (cosDoc != null) cosDoc.close();
                   if (pdDoc != null) pdDoc.close();
               } catch (Exception e1) {
               e.printStackTrace();
            }
            return null;
        }      

        return parsedText;
    }

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


        try {
            PrintWriter pw = new PrintWriter(fileName);
            pw.print(pdfText);
            pw.close();     
        } catch (Exception e) {

            e.printStackTrace();
        }

    }

    //Extracts text from a PDF Document and writes it to a text file
    public static void test() {
        String args[]={"C://Sample.pdf","C://Sample.txt"};
        if (args.length != 2) {

            System.exit(1);
        }

        PDFTextParser pdfTextParserObj = new PDFTextParser();


        String pdfToText = pdfTextParserObj.pdftoText(args[0]);

        if (pdfToText == null) {

        }
        else {

            pdfTextParserObj.writeTexttoFile(pdfToText, args[1]);
        }
    }  

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

上記のコードは、pdf をテキストに抽出するために機能しますが、私の要件は、ヘッダーとフッターを無視して、pdf ファイルからコンテンツのみを抽出することです。必要な出力:

Networking Academy
        We live in an increasingly connected world, creating a global economy and a growing need for technical skills.  Networking Academy delivers information technology skills to over 500,000 students a year in more than 165 countries worldwide. Networking Academy students have the opportunity to participate in a powerful and consistent learning experience that is supported by high quality, online curricula and assessments, instructor training, hands-on labs, and classroom interaction. This experience ensures the same level of qualifications and skills regardless of where in the world a student is located.

これを行う方法を教えてください。ありがとう。