Java-使用PDFTextStream时出错

Question

I have a PDF file and want to extract text from it. I am using PDFTextStream. I got this code from its documentation, but it gives error.

import com.snowtide.PDF;
import com.snowtide.pdf.Document;
import com.snowtide.pdf.OutputTarget;

public class ExtractText {
  public static void main (String[] args) throws java.io.IOException {
   // String pdfFilePath = args[0];

    Document pdf = PDF.open("data/bill.pdf");
    StringBuilder text = new StringBuilder(1024);
    pdf.pipe(new OutputTarget(text));
    pdf.close();
    System.out.println(text);
  }
}

This is the error:

Exception in thread "main" java.lang.NullPointerException
    at com.snowtide.pdf.e.b(SourceFile:2740)
    at com.snowtide.pdf.e.a(SourceFile:2691)
    at com.snowtide.pdf.e.c(SourceFile:2642)
    at com.snowtide.pdf.e.a(SourceFile:2059)
    at com.snowtide.pdf.e.c(SourceFile:2108)
    at com.snowtide.pdf.e.a(SourceFile:1950)
    at com.snowtide.pdf.e.a(SourceFile:1755)
    at com.snowtide.pdf.e.a(SourceFile:1820)
    at com.snowtide.pdf.e.pipe(SourceFile:468)
    at ExtractText.main(ExtractText.java:12)

I am using PDFTextStream version 3.3.1. Line 12 is this:

pdf.pipe(new OutputTarget(text));

Answer 1

The Pdf file should be corrupted or something... there is no way to reproduce the error. Try with another pdf file