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最近，想着将pdf的文件进行读取其内容，发现了一个比较好用的依赖pdfbox。目前使用这个依赖，进行实现一个简单实例，如果之后需要使用到更深的了解，会进行更新。这里提醒一下：jdk8尽量采用pdfbox3.x版本。

1. 对于文件的读取

File file = new File("E:\\关于pdfbox学习.pdf");PDDocument document = Loader.loadPDF(file);//Instantiate PDFTextStripper classPDFTextStripper pdfStripper = new PDFTextStripper();//Retrieving text from PDF documentString text = pdfStripper.getText(document);System.out.println(text);

通过这个代码可以读取到相应的pdf文字:

上述是关于文字的读取，如果是获取pdf中的截图，那么进行如下操作：

2. 获取pdf中的截图
   代码展示：

int pageNum = document.getNumberOfPages();
for (int i = 0; i < pageNum; i++) {PDPage page = document.getPage(i);PDResources resources = page.getResources();Iterable<COSName> xObjectNames = resources.getXObjectNames();if (xObjectNames != null){Iterator<COSName> names = xObjectNames.iterator();while (names.hasNext()){COSName next = names.next();if (resources.isImageXObject(next)){PDImageXObject xObject = (PDImageXObject) resources.getXObject(next);BufferedImage image = xObject.getImage();ImageIO.write(image, "png", new File("E:\\" + i + ".png"));}}}
}

结果如下：

所有代码展示：

package com.example.demo;import org.apache.pdfbox.Loader;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.PDResources;
import org.apache.pdfbox.pdmodel.graphics.PDXObject;
import org.apache.pdfbox.pdmodel.graphics.image.PDImageXObject;
import org.apache.pdfbox.text.PDFTextStripper;import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.Iterator;
public class FoxApiMain {public static void main(String[] args) {  //try{//读取本地文件File file = new File("E:\\关于pdfbox学习.pdf");PDDocument document = Loader.loadPDF(file);//Instantiate PDFTextStripper classPDFTextStripper pdfStripper = new PDFTextStripper();//Retrieving text from PDF documentString text = pdfStripper.getText(document);System.out.println(text);int pageNum = document.getNumberOfPages();for (int i = 0; i < pageNum; i++) {PDPage page = document.getPage(i);PDResources resources = page.getResources();Iterable<COSName> xObjectNames = resources.getXObjectNames();if (xObjectNames != null){Iterator<COSName> names = xObjectNames.iterator();while (names.hasNext()){COSName next = names.next();if (resources.isImageXObject(next)){PDImageXObject xObject = (PDImageXObject) resources.getXObject(next);BufferedImage image = xObject.getImage();ImageIO.write(image, "png", new File("E:\\" + i + ".png"));}}}}document.close();} catch (IOException e) {throw new RuntimeException(e);}}
}