如何使用java中的pdfbox从pdf文件中删除页眉和页脚

Question

我正在使用Pdf Parser将pdf转换为text.Below是我使用java将pdf转换为文本文件的代码.我的PDF文件包含以下数据:

    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).

示例代码:

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();
    }
}

上面的代码适用于将pdf提取为text.But我的要求是忽略页眉和页脚并仅从pdf文件中提取内容.所需输出:

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.

请建议我如何做到这一点.谢谢.

Answer 1

通常,PDF中的页眉或页脚文本没有什么特别之处.可以不同地标记该材料,但标记是可选的,OP不提供要检查的样本PDF.

因此,通常需要一些手动工作(或一些故障密集型图像分析)来在页面上找到标题,内容和页脚材料的区域.

但是,只要您拥有这些区域的坐标,就可以使用PDFTextStripperByArea扩展PDFTextStripper区域来按区域收集文本.只需使用包含内容但不包括页眉和页脚的最大矩形以及pdfStripper.getText(pdDoc)调用定义的区域后为页面内容getTextForRegion定义区域.