Java实现pdf转图片，分享给大家

pom.xml内容为：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>pdf2img</groupId>
    <artifactId>pdf2img</artifactId>
    <version>1.0-SNAPSHOT</version>
    <dependencies>
        <dependency>
            <groupId>org.apache.pdfbox</groupId>
            <artifactId>pdfbox</artifactId>
            <version>2.0.4</version>
        </dependency>
    </dependencies>
</project>

单个pdf文件转图片Java代码如下：

    public static List<String> pdfToImagePath(String filePath) {
        List<String> list = new ArrayList<String>();
        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;
    }

多个pdf文件转图片Java代码如下：

    public static void main(String[] args) {

        ArrayList<String> list=getDirPathFiles("D:\\pdf\\3");
        for(int i=0;i<list.size();i++){
            try {
                String filePath = list.get(i);
                System.out.println(list.size() + "//" + i + "//" + filePath);
                pdfToImagePath(filePath, "D:\\pdf\\3save", "3-"+i + "");
            }catch (Exception e){
                e.printStackTrace();
                continue;
            }
        }
    }
    public static List<String> pdfToImagePath(String filePath,String savePath,String subStr) {
        List<String> list = new ArrayList<String>();
        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 = savePath + "/"+subStr+"-" + i + ".jpg";
                ImageIO.write(image, "PNG", new File(imagePath));
                list.add(imagePath);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return list;
    }

   //获取文件夹下所有文件
    public static ArrayList getDirPathFiles(String path) {
        ArrayList files = new ArrayList<String>();
        File file = new File(path);
        File[] tempList = file.listFiles();

        for (int i = 0; i < tempList.length; i++) {
            if (tempList[i].isFile()) {
                files.add(tempList[i].toString());
            }
        }
        return files;
    }