java实现img与pdf相互转换

import java.awt.image.BufferedImage; 
import java.io.ByteArrayOutputStream;
import java.io.File; 

import java.io.FileInputStream; 

import java.io.FileOutputStream; 
import java.io.InputStream; 

import java.io.RandomAccessFile; 
import java.nio.ByteBuffer; 

import java.nio.channels.FileChannel; 
import java.util.Map; 
import java.util.Map.Entry; 
import java.util.TreeMap; 
 
import com.Utils.ImgFileTool; 

import com.lowagie.text.Document; 
import com.lowagie.text.Image; 

import com.lowagie.text.Rectangle; 
import com.lowagie.text.pdf.PdfCopy; 
import com.lowagie.text.pdf.PdfImportedPage; 
import com.lowagie.text.pdf.PdfReader; 
import com.lowagie.text.pdf.PdfWriter; 
import com.sun.image.codec.jpeg.JPEGCodec; 
import com.sun.image.codec.jpeg.JPEGImageEncoder; 
import com.sun.pdfview.PDFFile; 

import com.sun.pdfview.PDFPage; 
 
/**
*
* @author hubiao
* @dateTime 2014-06-07
*      本工具对实现对IMG与PDF相互转换。

*      运行测试需要导入以下2个jar包
*          itext-2.0.2.jar    

*          PDFRenderer.jar
*
*/ 
@SuppressWarnings("unused") 
public class ImgPdfUtils { 
    public staticvoid main(String[] args)
throws Exception { 
        //PDF包提取 pdf 
        //pdfExtraction(); 
         
        //pdf转jpg 

        //pdfToJpg("E:\\java\\资料pdf\\1.pdf","E:\\java\\资料pdf\\1.jpg",1); 
         
        //将多个jpg直接合并成pdf包 
        //extractionPdf("F:\\temp\\Project\\数据\\dfdsfds\\巴黎公社活动家传略_img","F:\\temp\\Project\\数据\\dfdsfds\\巴黎公社活动家传略_img.pdf"); 
         
        //jpg转pdf 

        //jpgToPdf(); 
         
        //文件排序 
        //listOrder(); 

         
        ImgFileTool.imgMerageToPdf(new File("F:\\temp\\Project\\数据\\dfdsfds\\巴黎公社活动家传略_img").listFiles(),new File("F:\\temp\\Project\\数据\\dfdsfds\\","巴黎公社活动家传略.pdf")); 
    } 
     
    private staticvoid listOrder() { 

         
        File[] listFiles = new File("F:\\temp\\Project\\数据\\dfdsfds\\巴黎公社活动家传略_img").listFiles(); 
        TreeMap<Integer, File> tree =
new TreeMap<Integer, File>(); 
        for(File f : listFiles) 

        { 
            tree.put(Integer.parseInt(f.getName().replaceAll(".jpg$","")), f); 

        } 
        for(Entry<Integer, File> eif : tree.entrySet()) 
        { 
            System.out.println(eif.getKey()+"="+eif.getValue().toString()); 
        } 
    } 
    /**
     * @param list  图片集合
     * @param file 保存路径

     * @return  true,合并完成
     *      如果文件名不是1.jpg，2.jpg，3.jpg，4.jpg这样的。则需要自己重写TreeMap的排序方式！
     */ 
    public staticboolean imgMerageToPdf(File[] list, File file)throws Exception
{ 
        //1：对图片文件通过TreeMap以名称进行自然排序 
        Map<Integer,File> mif = new TreeMap<Integer,File>(); 
        for(File f : list) 
            mif.put(Integer.parseInt(f.getName().replaceAll(".jpg$","")), f); 

         
        //2：获取第一个Img的宽、高做为PDF文档标准 
        ByteArrayOutputStream baos = new ByteArrayOutputStream(2048*3); 
        InputStream is = new FileInputStream(mif.get(1)); 
        for(int len;(len=is.read())!=-1;) 
            baos.write(len); 
         
        baos.flush(); 
        Image image = Image.getInstance(baos.toByteArray()); 
        float width = image.width(); 
        float height = image.height(); 
        baos.close(); 
         
        //3:通过宽高 ，实例化PDF文档对象。 
        Document document = new Document(new Rectangle(width,height)); 
        PdfWriter pdfWr = PdfWriter.getInstance(document,
new FileOutputStream(file)); 
        document.open(); 
         
        //4：获取每一个图片文件，转为IMG对象。装载到Document对象中 
        for(Entry<Integer,File> eif : mif.entrySet()) 
        { 
            //4.1:读取到内存中 
            baos = new ByteArrayOutputStream(2048*3); 
            is = new FileInputStream(eif.getValue()); 
            for(int len;(len=is.read())!=-1;) 
                baos.write(len); 
            baos.flush(); 
             
            //4.2通过byte字节生成IMG对象 

            image = Image.getInstance(baos.toByteArray()); 
            Image.getInstance(baos.toByteArray()); 
            image.setAbsolutePosition(0.0f,0.0f); 

             
            //4.3：添加到document中 
            document.add(image); 
            document.newPage(); 
            baos.close(); 
        } 
         
        //5：释放资源 

        document.close(); 
        pdfWr.close(); 
         
        return true; 
    } 
    /**
     *
     * @param source 源文件

     * @param target 目标文件
     * @param x 读取源文件中的第几页

     */ 
    private staticvoid pdfToJpg(String source,String target,int x)throws
Exception { 
        //创建从中读取和向其中写入（可选）的随机访问文件流，R表示对其只是访问模式 
        RandomAccessFile rea = new RandomAccessFile(new File(source),"r"); 

 
        //将流读取到内存中，然后还映射一个PDF对象 
        FileChannel channel = rea.getChannel(); 
        ByteBuffer buf = channel.map(FileChannel.MapMode.READ_ONLY,0, channel.size()); 
        PDFFile pdfFile = new PDFFile(buf); 
        PDFPage page = pdfFile.getPage(x);   
 
        // get the width and height for the doc at the default zoom  

        java.awt.Rectangle rect = new java.awt.Rectangle(0,0, (int) page.getBBox()   
                .getWidth(), (int) page.getBBox().getHeight());   
 
        // generate the image 
 
        java.awt.Image img = page.getImage(rect.width, rect.height,
// width & 
                rect, // clip rect 
                null, // null for the ImageObserver 
                true,
// fill background with white 
                true // block until drawing is done 
                );   
 
        BufferedImage tag = new BufferedImage(rect.width, rect.height,   
                BufferedImage.TYPE_INT_RGB);   
         
        tag.getGraphics().drawImage(img, 0,0, rect.width, rect.height,   

                null);   
        FileOutputStream out = new FileOutputStream(target);// 输出到文件流 
 
        JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);   
        encoder.encode(tag); // JPEG编码   
        out.close();         
    } 
    /**
     * @param source  源PDF文件路径
     * @param target  保存PDF文件路径
     * @param pageNum  提取PDF中第pageNum页

     * @throws Exception 
     */ 
    private staticvoid pdfExtraction(String source,String target,int pageNum)throws
Exception{ 
        //1：创建PDF读取对象 
        PdfReader pr = new PdfReader(source); 
        System.out.println("this document "+pr.getNumberOfPages()+" page"); 
         
        //2：将第page页转为提取，创建document对象 
        Document doc = new Document(pr.getPageSize(pageNum)); 
         
        //3：通过PdfCopy转其单独存储 
        PdfCopy copy = new PdfCopy(doc,new FileOutputStream(new File(target))); 
        doc.open(); 
        doc.newPage(); 
         
        //4：获取第1页，装载到document中。 

        PdfImportedPage page = copy.getImportedPage(pr,pageNum); 
        copy.addPage(page);  
         
        //5：释放资源 
        copy.close(); 
        doc.close(); 
        pr.close(); 
    } 
    /**
     * @param pdfFile 源PDF文件
     * @param imgFile   图片文件

     */ 
    private staticvoid jpgToPdf(File pdfFile,File imgFile) throws Exception
{ 
        //文件转img 
        InputStream is = new FileInputStream(pdfFile); 
        ByteArrayOutputStream baos = new ByteArrayOutputStream(); 
        for(int i;(i=is.read())!=-1;) 
        { 
            baos.write(i); 
        } 
        baos.flush(); 
         
        //取得图像的宽和高。 

        Image img = Image.getInstance(baos.toByteArray()); 
        float width = img.width(); 
        float height = img.height(); 
        img.setAbsolutePosition(0.0F,0.0F);//取消偏移 
        System.out.println("width = "+width+"\theight"+height); 
         
        //img转pdf 
        Document doc = new Document(new Rectangle(width,height)); 
        PdfWriter pw = PdfWriter.getInstance(doc,new FileOutputStream(imgFile)); 
        doc.open(); 
        doc.add(img); 
         
        //释放资源 
        System.out.println(doc.newPage()); 
        pw.flush(); 
        baos.close(); 
        do
a39c
c.close(); 
        pw.close(); 
    } 
     
}