java img图片转pdf 工具类

import java.io.File;
 import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.util.ArrayList;

 import javax.servlet.http.HttpServletRequest;

 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;

 public class PdfUtilImg {
      public static File Pdf(ArrayList<String> imageUrllist,String mOutputPdfFileName) {
             Document doc = new Document(PageSize.A4, 20, 20, 20, 20); //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;
         }
     public void imgOfPdf(String filepath,HttpServletRequest request) {
             boolean result = false;
             try {
                   ArrayList<String> imageUrllist = new ArrayList<String>(); //图片list集合
                   imageUrllist.add(request.getSession()
                        .getServletContext().getRealPath("\\" + filepath));  //添加图片文件路径
                   String fles = filepath.substring(0, filepath.lastIndexOf("."));
                   String pdfUrl = request.getSession().getServletContext()
                             .getRealPath("\\" +fles+".pdf");  //输出pdf文件路径
                 result = true;
                 if (result == true) {
                     File file = PdfUtilImg.Pdf(imageUrllist, pdfUrl);//生成pdf
                    file.createNewFile();
                 }
             } catch (IOException e) {
                 e.printStackTrace();
             }
         }
 }
使用方法：

PdfUtilImg img = new PdfUtilImg();
img.imgOfPdf(filePaths, request);//filePaths为存储位置