java实现截取PDF指定页并进行图片格式转换

迷南。 2023-06-01 12:38 24阅读 0赞

**1、引入依赖**

<dependency>
        <groupId>org.apache.pdfbox</groupId>
        <artifactId>pdfbox</artifactId>
        <version>2.0.16</version>
    </dependency>
    <dependency>
        <groupId>org.apache.pdfbox</groupId>
        <artifactId>fontbox</artifactId>
        <version>2.0.16</version>
    </dependency>

**jar包下载地址：**

https://mvnrepository.com/artifact/org.apache.pdfbox/pdfbox

https://mvnrepository.com/artifact/org.apache.pdfbox/fontbox

**2、实现DEMO**

package com.dddpeter.app;
    
    import org.apache.pdfbox.multipdf.Splitter;
    import org.apache.pdfbox.pdmodel.PDDocument;
    import org.apache.pdfbox.rendering.PDFRenderer;
    
    import javax.imageio.ImageIO;
    import javax.imageio.stream.ImageOutputStream;
    import java.awt.image.BufferedImage;
    import java.io.*;
    import java.util.List;
    import java.util.ListIterator;
    
    public class PDFUtils {
        public static String splitPdf(int pageNum, String source, String dest) {
            File indexFile = new File(source);
            File outFile = new File(dest);
            PDDocument document = null;
            try {
                document = PDDocument.load(indexFile);
                // document.getNumberOfPages();
                Splitter splitter = new Splitter();
                splitter.setStartPage(pageNum);
                splitter.setEndPage(pageNum);
                List<PDDocument> pages = splitter.split(document);
                ListIterator<PDDocument> iterator = pages.listIterator();
                while (iterator.hasNext()) {
                    PDDocument pd = iterator.next();
                    if (outFile.exists()) {
                        outFile.delete();
                    }
                    pd.save(outFile);
                    pd.close();
                    if (outFile.exists()) {
                        return outFile.getPath();
                    }
                }
                document.close();
            } catch (IOException e) {
                e.printStackTrace();
            } catch (Exception e) {
                e.printStackTrace();
            }
            return null;
        }
        public static void pdfFileToImage(File pdffile,String targetPath){
            try {
                FileInputStream instream = new FileInputStream(pdffile);
                InputStream byteInputStream=null;
                try {
                    PDDocument doc = PDDocument.load(instream);
                    PDFRenderer renderer = new PDFRenderer(doc);
                    int pageCount = doc.getNumberOfPages();
                    if (pageCount > 0) {
                        BufferedImage image = renderer.renderImage(0, 4.0f);
                        image.flush();
                        ByteArrayOutputStream bs = new ByteArrayOutputStream();
                        ImageOutputStream imOut;
                        imOut = ImageIO.createImageOutputStream(bs);
                        ImageIO.write(image, "png", imOut);
                        byteInputStream = new ByteArrayInputStream(bs.toByteArray());
                        byteInputStream.close();
                    }
                    doc.close();
                }
                catch (IOException e) {
                    e.printStackTrace();
                }
                File uploadFile = new File(targetPath);
                FileOutputStream fops;
                fops = new FileOutputStream(uploadFile);
                fops.write(readInputStream(byteInputStream));
                fops.flush();
                fops.close();
            }
            catch (Exception e) {
                e.printStackTrace();
            }
        }
    
        public static byte[] readInputStream(InputStream inStream) throws Exception {
            ByteArrayOutputStream outStream = new ByteArrayOutputStream();
            byte[] buffer = new byte[1024];
            int len = 0;
            while ((len = inStream.read(buffer)) != -1) {
                outStream.write(buffer, 0, len);
            }
            inStream.close();
            return outStream.toByteArray();
        }
    
    
        public static void main(String[] args) {
            String path = splitPdf(4,"D:\\data\\11.pdf","D:\\data\\out11.pdf");
            File file =new File(path);
            //上传的是png格式的图片结尾
            String targetfile="D:\\data\\out11.png";
            pdfFileToImage(file,targetfile);
    
        }
    }

**其中指定第几页可配合https://www.cnblogs.com/xsdty/p/11463174.html**

**实现动态获取关键字页码，动态截取转换为自己想要的格式图片。**

转载于:https://www.cnblogs.com/xsdty/p/11463439.html