Question

我目前正在努力让pdfbox工作以从pdfs中提取所有图像。我使用的是pdfbox.1.8.7 jar文件，下面是我的代码：

import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.apache.pdfbox.pdmodel.*;
import org.apache.pdfbox.pdmodel.graphics.xobject.PDXObjectImage;

public class PdfBoxExtractor {
    public static void main(String[] args) {
        PdfBoxExtractor obj = new PdfBoxExtractor();
        try {
            obj.read_pdf();
        } catch (IOException ex) {
            System.out.println("" + ex);
        }

    }

    void read_pdf() throws IOException {
        PDDocument document = null;
        try {
            document = PDDocument
                    .load("C:\\Testpdf\\pdfsample\\15802643.pdf");
//Linux path("/home/biadmin/freddy/15802643.pdf")
        } catch (IOException ex) {
            System.out.println("" + ex);
        }
        List pages = document.getDocumentCatalog().getAllPages();
        Iterator iter = pages.iterator();
        int i = 1;
        String name = null;

        while (iter.hasNext()) {
            PDPage page = (PDPage) iter.next();
            PDResources resources = page.getResources();
            Map pageImages = resources.getImages();
            if (pageImages != null) {
                Iterator imageIter = pageImages.keySet().iterator();
                while (imageIter.hasNext()) {
                    String key = (String) imageIter.next();
                    PDXObjectImage image = (PDXObjectImage) pageImages.get(key);
                    image.write2file("C:\\processed\\pdf\\image" + i);
//Linux path (/home/biadmin/processed/image"+i)
                    i++;
                }
            }



        }

    }

}

我将相同的代码移植到redhat 6.5环境，更改此代码中的源/接收路径并尝试运行它。但它会带来很多错误。我目前一无所知，为什么同样的代码会在linux中失败。两者中的JRE是Oracle - JRE 1.7 请查看我在Linux中遇到的错误。

Dec 7, 2014 4:52:44 AM org.apache.pdfbox.cos.COSDocument finalize
WARNING: Warning: You did not close a PDF Document
Dec 7, 2014 4:52:44 AM org.apache.pdfbox.pdmodel.graphics.xobject.PDPixelMap getRGBImage
SEVERE: java.lang.IndexOutOfBoundsException: Index: 2, Size: 0
Throwable occurred: java.lang.IndexOutOfBoundsException: Index: 2, Size: 0
    at java.util.ArrayList.get(ArrayList.java:352)
    at org.apache.pdfbox.io.RandomAccessBuffer.seek(RandomAccessBuffer.java:110)
    at org.apache.pdfbox.io.RandomAccessFileOutputStream.write(RandomAccessFileOutputStream.java:116)
    at org.apache.pdfbox.filter.RunLengthDecodeFilter.decode(RunLengthDecodeFilter.java:92)
    at org.apache.pdfbox.cos.COSStream.doDecode(COSStream.java:318)
    at org.apache.pdfbox.cos.COSStream.doDecode(COSStream.java:266)
    at org.apache.pdfbox.cos.COSStream.getUnfilteredStream(COSStream.java:192)
    at org.apache.pdfbox.pdmodel.common.PDStream.createInputStream(PDStream.java:232)
    at org.apache.pdfbox.pdmodel.common.PDStream.getByteArray(PDStream.java:510)
    at org.apache.pdfbox.pdmodel.graphics.xobject.PDPixelMap.getRGBImage(PDPixelMap.java:255)
    at org.apache.pdfbox.pdmodel.graphics.xobject.PDPixelMap.write2OutputStream(PDPixelMap.java:386)
    at org.apache.pdfbox.pdmodel.graphics.xobject.PDXObjectImage.write2file(PDXObjectImage.java:262)
    at com.vinayak.PdfBoxExtractor3.read_pdf(PdfBoxExtractor3.java:45)
    at com.vinayak.PdfBoxExtractor3.main(PdfBoxExtractor3.java:16)
Exception in thread "main" java.lang.NullPointerException
    at com.vinayak.PdfBoxExtractor3.read_pdf(PdfBoxExtractor3.java:39)
    at com.vinayak.PdfBoxExtractor3.main(PdfBoxExtractor3.java:16)

由于

Pdfbox在linux中引发多个异常，但在Windows 7上运行正常

0 个答案: