PDDocument声明出现未知错误：PDFBox

Question

尽管导入了所有必需的库，但使用PDDocument和PDFTextStripper方法时却出现错误。

import org.apache.pdfbox.pdmodel.*;
import org.apache.pdfbox.pdmodel.edit.*;
import org.apache.pdfbox.pdmodel.graphics.xobject.*;
import java.io.*;

public class importingPDF {

    public static void main(String[] args) {
        PDDocument pd;
         BufferedWriter wr;
         try {
                 File input = new File("C:\\Invoice.pdf");  // The PDF file from where you would like to extract
                 File output = new File("C:\\SampleText.txt"); // The text file where you are going to store the extracted data
                 pd = PDDocument.load(input);
                 System.out.println(pd.getNumberOfPages());
                 System.out.println(pd.isEncrypted());
                 pd.save("CopyOfInvoice.pdf"); // Creates a copy called "CopyOfInvoice.pdf"
                 PDFTextStripper stripper = new PDFTextStripper();
                 wr = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(output)));
                 stripper.writeText(pd, wr);
                 if (pd != null) {
                     pd.close();
                 }
                // I use close() to flush the stream.
                wr.close();
         } catch (Exception e){
                 e.printStackTrace();
                } 
             }
    }

Answer 1

看来这是与不在类路径上的jar有关的问题。

您可以在此处搜索和解决问题的同类问题，请参阅此获取java.lang.NoClassDefFoundError：org / pdfbox / pdfparser /

Answer 2

感谢您的Hardik。 如您所说，我显然没有加载正确的jar文件。 以下是必要的jar文件！

import org.pdfbox.cos.COSDocument;
import org.pdfbox.exceptions.COSVisitorException;
import org.pdfbox.pdfparser.PDFParser;
import org.pdfbox.pdmodel.PDDocument;
import org.pdfbox.pdmodel.PDDocumentInformation;
import org.pdfbox.util.PDFTextStripper;