获取Java中PDFBox工具中特定位置周围的可用空间位置

Question

我正在使用PDFBox根据PDF中的文本放置动态文本。我已经阅读了PDF格式的每个页面，以PDF格式查找文本，并在其周围放置相应的匹配文本。但是文本被放置在另一个文本或框或行上。我需要在Free Space上放置动态匹配的文本。但我无法找到使用Java PDFbox在PDF文本周围寻找自由空间的方法。 请在下面找到我们的代码。

package com.mycompany.pdfboxsample;

import java.io.File;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import org.apache.pdfbox.cos.COSBase;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.PDResources;
import org.apache.pdfbox.pdmodel.common.PDRectangle;
import org.apache.pdfbox.pdmodel.graphics.xobject.PDXObject;
import org.apache.pdfbox.pdmodel.graphics.xobject.PDXObjectForm;
import org.apache.pdfbox.pdmodel.graphics.xobject.PDXObjectImage;



/**
 *
 * @author Gayathri.R
 */
public class MainClass {
    public static void main(String[] args) throws IOException {
    try{
        PDDocument document = null; 
        document = PDDocument.load(new File("C:\\Gayathri\\Smartacrf\\sample\\ItextSample\\oldcrf20.pdf")); 
        List pages = document.getDocumentCatalog().getAllPages();
        Iterator iter = pages.iterator(); 
        while (iter.hasNext()) {
            PDPage page = (PDPage) iter.next();
            PDResources resources = page.getResources();
            Map<String,PDXObject> pageImages = resources.getXObjects();
            if (pageImages != null) { 
            Iterator imageIter = pageImages.keySet().iterator();
            while (imageIter.hasNext()) {
                String key = (String) imageIter.next();
                PDXObjectForm image = (PDXObjectForm) pageImages.get(key);
                COSBase cosObject = image.getCOSObject();
                System.out.println("Finded");
                float lowerleftx =image.getBBox().getLowerLeftX();
                float upperleftx =image.getBBox().getLowerLeftY();
                float lowerlefty =image.getBBox().getUpperRightX();
                float upperlefty =image.getBBox().getUpperRightY();
                float width =image.getBBox().getWidth();
                float height =image.getBBox().getHeight();

            }
            }
        }

    }   
    catch(Exception ex)
    {
    System.out.println(ex);
    }
}