java中pdf转图片,（多页pdf转成一张图或多张图），

青旅半醒 2022-06-10 05:29 426阅读 0赞

1：icepdf的jar包下载地址

[http://www.icesoft.org/java/downloads/icepdf-downloads.jsf][http_www.icesoft.org_java_downloads_icepdf-downloads.jsf]

2：所需jar包

![Image 1][]![Center][]

3，多页pdf转一张图代码如下，转换的图片会带有官方的水印。去水印的方法可以查看另一篇文章：[icepdf去水印方法][icepdf]

package com.java.pdf;
    
    import java.awt.image.BufferedImage;
    import java.io.File;
    import java.io.FileInputStream;
    import java.io.IOException;
    import java.io.InputStream;
    import java.util.ArrayList;
    import java.util.List;
    
    import javax.imageio.ImageIO;
    
    import org.icepdf.core.pobjects.Document;
    import org.icepdf.core.pobjects.Page;
    import org.icepdf.core.util.GraphicsRenderingHints;
    
    
    public class PdfToJpg {
        
        
        public static void main(String[] args) {
            String pdfFile = "E:\\pdf\\aa.pdf";
            String outpath = "E:\\pdf\\aa.jpg";
            pdf2multiImage(pdfFile,outpath,1000);
        }
    
        private static void pdf2multiImage(String pdfFile, String outpath, int maxPage) {  
            try {  
                InputStream is = new FileInputStream(pdfFile);  
                List<BufferedImage> piclist = new ArrayList<BufferedImage>();  
                Document document = new Document();  
                try {  
                    document.setFile(pdfFile);  
                    } catch (Exception ex) {  
                }  
                float scale = 2.5f;  //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,Page.BOUNDARY_CROPBOX, rotation, scale);  
                    piclist.add(image);
                }  
                document.dispose(); 
                yPic(piclist, outpath);  
                is.close();  
            } catch (IOException e) {  
                e.printStackTrace();  
            }  
        }  
        
        
        public static void yPic(List<BufferedImage> piclist, String outPath) {// 纵向处理图片  
            if (piclist == null || piclist.size() <= 0) {  
                System.out.println("图片数组为空!");  
                return;  
            }  
            try {  
                int height = 0, // 总高度  
                width = 0, // 总宽度  
                _height = 0, // 临时的高度 , 或保存偏移高度  
                __height = 0, // 临时的高度，主要保存每个高度  
                picNum = piclist.size();// 图片的数量  
                File fileImg = null; // 保存读取出的图片  
                int[] heightArray = new int[picNum]; // 保存每个文件的高度  
                BufferedImage buffer = null; // 保存图片流  
                List<int[]> imgRGB = new ArrayList<int[]>(); // 保存所有的图片的RGB  
                int[] _imgRGB; // 保存一张图片中的RGB数据  
                for (int i = 0; i < picNum; i++) {  
                    buffer = piclist.get(i);  
                    heightArray[i] = _height = buffer.getHeight();// 图片高度  
                    if (i == 0) {  
                        width = buffer.getWidth();// 图片宽度  
                    }  
                    height += _height; // 获取总高度  
                    _imgRGB = new int[width * _height];// 从图片中读取RGB  
                    _imgRGB = buffer.getRGB(0, 0, width, _height, _imgRGB, 0, width);  
                    imgRGB.add(_imgRGB);  
                }  
                _height = 0; // 设置偏移高度为0  
                // 生成新图片  
                BufferedImage imageResult = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);  
                for (int i = 0; i < picNum; i++) {  
                    __height = heightArray[i];  
                    if (i != 0) _height += __height; // 计算偏移高度  
                    imageResult.setRGB(0, _height, width, __height, imgRGB.get(i), 0, width); // 写入流中  
                }  
                File outFile = new File(outPath);  
                ImageIO.write(imageResult, "jpg", outFile);// 写图片  
            } catch (Exception e) {  
                e.printStackTrace();  
            }  
        }  
        
    }

4：多页pdf转多页图片代码如下

public static void main(String[] args) {
            String filePath = "E:\\pdf\\C20170613004001.pdf";  
            Document document = new Document();  
            try {  
                document.setFile(filePath);  
                } catch (Exception ex) {  
            }  
            float scale = 2.5f;  
            float rotation = 0f;  
            for (int i = 0; i < document.getNumberOfPages(); i++) {  
                BufferedImage image = (BufferedImage)  
                document.getPageImage(i,GraphicsRenderingHints.SCREEN,Page.BOUNDARY_CROPBOX, rotation, scale);  
                RenderedImage rendImage = image;  
                try {  
                    File file = new File("E:\\pdf\\imageCapture1_" + i + ".png");  
                    ImageIO.write(rendImage, "png", file);  
                    } catch (IOException e) {  
                    e.printStackTrace();  
                }  
                image.flush();  
            }  
            document.dispose();  
        }

[http_www.icesoft.org_java_downloads_icepdf-downloads.jsf]: http://www.icesoft.org/java/downloads/icepdf-downloads.jsf
[Image 1]: 
[Center]: /images/20220610/e4d03d956d4345bab047c36e0f53d0c6.png
[icepdf]: http://blog.csdn.net/the_thinnest/article/details/77093465