java img圖片轉pdf 工具類

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一個pdf文檔 
            try {  
                PdfWriter.getInstance(doc, new FileOutputStream(mOutputPdfFileName)); //pdf寫入 
                doc.open();//打開文檔  
                for (int i = 0; i < imageUrllist.size(); i++) {  //循環圖片List，將圖片加入到pdf中
                    doc.newPage();  //在pdf創建一頁
                    Image png1 = Image.getInstance(imageUrllist.get(i)); //通過文件路徑獲取image 
                    float heigth = png1.getHeight();  
                    float width = png1.getWidth();  
                    int percent = getPercent2(heigth, width);  
                    png1.setAlignment(Image.MIDDLE);  
                    png1.scalePercent(percent+3);// 表示是原來圖像的比例;  
                    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);  //輸出流
            if (!mOutputPdfFile.exists()) {  
                mOutputPdfFile.deleteOnExit();  
                return null;  
            }  
            return mOutputPdfFile; //反回文件輸出流
        }  
      
        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>(); //圖片list集合
                  imageUrllist.add(request.getSession()
                       .getServletContext().getRealPath("\\" + filepath));  //添加圖片文件路徑
                  String fles = filepath.substring(0, filepath.lastIndexOf("."));
                  String pdfUrl = request.getSession().getServletContext()
                            .getRealPath("\\" +fles+".pdf");  //輸出pdf文件路徑          
                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為存儲位置