java如何将图片转为pdf

川长思鸟来 2022-12-21 09:30 207阅读 0赞

> `引入pom依赖`

<dependency>
    	<groupId>com.itextpdf</groupId>
    	<artifactId>itextpdf</artifactId>
    	<version>5.4.2</version>
    </dependency>

> `2.创建图片转pdf的实现类`

package com.ran;
    
    import com.itextpdf.text.Document;
    import com.itextpdf.text.DocumentException;
    import com.itextpdf.text.Image;
    import com.itextpdf.text.PageSize;
    import com.itextpdf.text.pdf.PdfWriter;
    
    import java.io.File;
    import java.io.FileNotFoundException;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.util.ArrayList;
    
    /** * 图片转pdf工具类 */
    public class ImgToPdfUtil { 
        public static File Pdf(ArrayList<String> imageUrllist, String mOutputPdfFileName) { 
            Document doc = new Document(PageSize.A4, 0, 0, 0, 0); //new一个pdf文档
            try { 
                PdfWriter.getInstance(doc, new FileOutputStream(mOutputPdfFileName)); //pdf写入
                doc.open();//打开文档
                for (int i = 0; i < imageUrllist.size(); i++) {   //循环图片List，将图片加入到pdf中
                    doc.newPage();  //在pdf创建一页
                    Image png1 = Image.getInstance(imageUrllist.get(i)); //通过文件路径获取image
                    float heigth = png1.getHeight();
                    float width = png1.getWidth();
                    int percent = getPercent2(heigth, width);
                    png1.setAlignment(Image.MIDDLE);
                    png1.scalePercent(percent + 3);// 表示是原来图像的比例;
                    doc.add(png1);
                }
                doc.close();
            } catch (FileNotFoundException e) { 
                e.printStackTrace();
            } catch (DocumentException e) { 
                e.printStackTrace();
            } catch (IOException e) { 
                e.printStackTrace();
            }
    
            File mOutputPdfFile = new File(mOutputPdfFileName);  //输出流
            if (!mOutputPdfFile.exists()) { 
                mOutputPdfFile.deleteOnExit();
                return null;
            }
            return mOutputPdfFile; //反回文件输出流
        }
    
        public static int getPercent(float h, float w) { 
            int p = 0;
            float p2 = 0.0f;
            if (h > w) { 
                p2 = 297 / h * 100;
            } else { 
                p2 = 210 / w * 100;
            }
            p = Math.round(p2);
            return p;
        }
    
        public static int getPercent2(float h, float w) { 
            int p = 0;
            float p2 = 0.0f;
            p2 = 530 / w * 100;
            p = Math.round(p2);
            return p;
        }
    
        /** * @Description: 通过图片路径及生成pdf路径，将图片转成pdf * @Author: zd * @Date: 2019/9/29 */
        public void imgOfPdf(String filepath, String imgUrl) { 
            try { 
                ArrayList<String> imageUrllist = new ArrayList<String>(); //图片list集合
                String[] imgUrls = imgUrl.split(",");
                for (int i=0; i<imgUrls.length; i++) { 
                    imageUrllist.add(imgUrls[i]);
                }
                String pdfUrl =  filepath;  //输出pdf文件路径
                File file = this.Pdf(imageUrllist, pdfUrl);//生成pdf
                file.createNewFile();
            } catch (IOException e) { 
                e.printStackTrace();
            }
        }
    
        public static void main(String[] args) { 
            ImgToPdfUtil img = new ImgToPdfUtil();
            img.imgOfPdf("D:\\test\\test.pdf","D:\\test\\7.jpg,D:\\test\\7.jpg");
        }
    }

> `3.测试一下即可是否成功`

public static void main(String[] args) { 
            ImgToPdfUtil img = new ImgToPdfUtil();
            img.imgOfPdf("D:\\test\\test.pdf","D:\\test\\7.jpg,D:\\test\\7.jpg");
        }

> `ok`

> `参考地址`：[https://www.cnblogs.com/sky-zky/p/9639256.htm][https_www.cnblogs.com_sky-zky_p_9639256.htm]l

[https_www.cnblogs.com_sky-zky_p_9639256.htm]: https://www.cnblogs.com/sky-zky/p/9639256.html