相关疑难解决方法(0)

作为 pdfbox 2.0.2 ( https://github.com/apache/pdfbox/tree/2.0.2 ) 用户的新手，我想获取所有描边线（例如，表格的列和行边框）一个页面（PDPage），因此我创建了以下类：package org.apache.pdfbox.rendering;

import java.awt.geom.GeneralPath;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URI;

import org.apache.commons.io.IOUtils;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.rendering.PDFRenderer;
import org.apache.pdfbox.rendering.PageDrawer;
import org.apache.pdfbox.rendering.PageDrawerParameters;

public class LineCatcher {
    private PageDrawer pageDrawer;
    private PDDocument document;
    private PDFRenderer pdfRenderer;
    private PDPage page;

    public LineCatcher(URI pdfSrcURI) throws IllegalArgumentException, 
        MalformedURLException, IOException {
        this.document = PDDocument.load(IOUtils.toByteArray(pdfSrcURI));
        this.pdfRenderer = new PDFRenderer(this.document);
    }
    public GeneralPath getLinePath(int pageIndex) throws IOException {
        this.page = this.document.getPage(pageIndex);
        PageDrawerParameters parameters = new PageDrawerParameters (this.pdfRenderer, this.page);
        this.pageDrawer = new …