Java将PDF转换成图片

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这里介绍两种将PDF转换成图片的方式

一、使用icepdf

下载导入jar包，jar包地址：http://download.csdn.net/download/u010782875/10041519

代码实现：

import java.awt.image.BufferedImage;import java.awt.image.RenderedImage;import java.io.File;import java.io.IOException;import java.util.ArrayList;import java.util.Iterator;import java.util.List;import javax.imageio.ImageIO;import org.icepdf.core.pobjects.Document;import org.icepdf.core.util.GraphicsRenderingHints;/** * @ClassName:PdfToImageIcePdf * @Description: * @author: * @data:2017/10/25 */public class PdfToImageIcePdf {    public static void main(final String[] args) {        String filePath = "D://Test/xxx.pdf"        List<String> imageList = getPdfToImage(filePath);        Iterator<String> iterator = imageList.iterator();        while(iterator.hasNext()){            System.out.println(iterator.next());        }    }    //返回生成图片的路径    public static List<String> getPdfToImage(String filePath) {        String fileName = filePath.substring(0,filePath.lastIndexOf("."));//获取去除后缀的文件路径        List<String> list = new ArrayList<>();        String imagePath;        Document document = new Document();        try{            document.setFile(filePath);        }catch (Exception e){            e.printStackTrace();        }        float scale = 1.3f;// 缩放比例        float rotation = 0f;// 旋转角度        for (int i = 0; i < document.getNumberOfPages(); i++) {            BufferedImage image = (BufferedImage) document.getPageImage(i,                    GraphicsRenderingHints.SCREEN,                    org.icepdf.core.pobjects.Page.BOUNDARY_CROPBOX, rotation,                    scale);            RenderedImage rendImage = image;            try {                int n = i + 1;                File f = new File(fileName);                if(!f.exists()){                    f.mkdir();                }                imagePath = fileName + "/image"+ n + ".jpg";//生成图片的路径                File file = new File(imagePath);                ImageIO.write(rendImage, "jpg", file);                // 这里png作用是：格式是jpg但有png清晰度                // ImageIO.write(rendImage, "png", file);                list.add(imagePath);            } catch (IOException e) {                e.printStackTrace();            }            image.flush();        }        document.dispose();        return list;    }

该方法在main（）可以正常运行，但是放入action中会报错 “Java.lang.NoClassDefFoundError:org/icepdf/core/util/content/b”

二、使用pdfbox

下载导入jar包，jar包地址：http://download.csdn.net/download/u010782875/10041527

代码实现：

import org.apache.pdfbox.pdmodel.PDDocument;import org.apache.pdfbox.rendering.PDFRenderer;import javax.imageio.ImageIO;import java.awt.image.BufferedImage;import java.io.File;import java.io.IOException;import java.util.ArrayList;import java.util.Iterator;import java.util.List;/** * @ClassName:PdfToImagePdfBox * @Description: * @author: * @data:2017/10/27 */public class PdfToImagePdfBox {    public static void main(String[] args){        String filePath = "D://Test/xxx.pdf";        List<String> imageList = pdfToImagePath(filePath);        Iterator<String> iterator = imageList.iterator();        while(iterator.hasNext()){            System.out.println(iterator.next());        }//        pdfToImage(filePath);    }    public static List<String> pdfToImagePath(String filePath){        List<String> list = new ArrayList<>();        String fileDirectory = filePath.substring(0,filePath.lastIndexOf("."));//获取去除后缀的文件路径        String imagePath;        File file = new File(filePath);        try {            File f = new File(fileDirectory);            if(!f.exists()){                f.mkdir();            }            PDDocument doc = PDDocument.load(file);            PDFRenderer renderer = new PDFRenderer(doc);            int pageCount = doc.getNumberOfPages();            for(int i=0; i<pageCount; i++){                // 方式1,第二个参数是设置缩放比(即像素)                // BufferedImage image = renderer.renderImageWithDPI(i, 296);                // 方式2,第二个参数是设置缩放比(即像素)                BufferedImage image = renderer.renderImage(i, 1.25f);  //第二个参数越大生成图片分辨率越高，转换时间也就越长                imagePath = fileDirectory + "/"+i + ".jpg";                ImageIO.write(image, "PNG", new File(imagePath));                list.add(imagePath);            }        } catch (IOException e) {            e.printStackTrace();        }        return list;    }

该方法在action中可以正常运行

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