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 
 *   本工具對(duì)實(shí)現(xiàn)對(duì)IMG與PDF相互轉(zhuǎn)換。 
 *   運(yùn)行測(cè)試需要導(dǎo)入以下2個(gè)jar包 
 *     itext-2.0.2.jar   
 *     PDFRenderer.jar 
 * 
 */ 
@SuppressWarnings("unused") 
public class ImgPdfUtils { 
  public static void main(String[] args) throws Exception { 
    //PDF包提取 pdf 
    //pdfExtraction(); 
     
    //pdf轉(zhuǎn)jpg 
    //pdfToJpg("E:\\java\\資料pdf\\1.pdf","E:\\java\\資料pdf\\1.jpg",1); 
     
    //將多個(gè)jpg直接合并成pdf包 
    //extractionPdf("F:\\temp\\Project\\數(shù)據(jù)\\dfdsfds\\巴黎公社活動(dòng)家傳略_img","F:\\temp\\Project\\數(shù)據(jù)\\dfdsfds\\巴黎公社活動(dòng)家傳略_img.pdf"); 
     
    //jpg轉(zhuǎn)pdf 
    //jpgToPdf(); 
     
    //文件排序 
    //listOrder(); 
     
    ImgFileTool.imgMerageToPdf(new File("F:\\temp\\Project\\數(shù)據(jù)\\dfdsfds\\巴黎公社活動(dòng)家傳略_img").listFiles(),new File("F:\\temp\\Project\\數(shù)據(jù)\\dfdsfds\\","巴黎公社活動(dòng)家傳略.pdf")); 
  } 
   
  private static void listOrder() { 
     
    File[] listFiles = new File("F:\\temp\\Project\\數(shù)據(jù)\\dfdsfds\\巴黎公社活動(dòng)家傳略_img").listFiles(); 
    TreeMap<Integer, File> tree = new TreeMap<Integer, File>(); 
    for(File f : listFiles) 
    { 
      tree.put(Integer.parseInt(f.getName().replaceAll(".jpg$", "")), f); 
    } 
    for(Entry<Integer, File> eif : tree.entrySet()) 
    { 
      System.out.println(eif.getKey()+"="+eif.getValue().toString()); 
    } 
  } 
  /** 
   * @param list 圖片集合 
   * @param file 保存路徑 
   * @return true,合并完成 
   *   如果文件名不是1.jpg，2.jpg，3.jpg，4.jpg這樣的。則需要自己重寫TreeMap的排序方式！ 
   */ 
  public static boolean imgMerageToPdf(File[] list, File file)throws Exception { 
    //1：對(duì)圖片文件通過TreeMap以名稱進(jìn)行自然排序 
    Map<Integer,File> mif = new TreeMap<Integer,File>(); 
    for(File f : list) 
      mif.put(Integer.parseInt(f.getName().replaceAll(".jpg$", "")), f); 
     
    //2：獲取第一個(gè)Img的寬、高做為PDF文檔標(biāo)準(zhǔn) 
    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:通過寬高 ，實(shí)例化PDF文檔對(duì)象。 
    Document document = new Document(new Rectangle(width,height)); 
    PdfWriter pdfWr = PdfWriter.getInstance(document, new FileOutputStream(file)); 
    document.open(); 
     
    //4：獲取每一個(gè)圖片文件，轉(zhuǎn)為IMG對(duì)象。裝載到Document對(duì)象中 
    for(Entry<Integer,File> eif : mif.entrySet()) 
    { 
      //4.1:讀取到內(nèi)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通過byte字節(jié)生成IMG對(duì)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：釋放資源 
    document.close(); 
    pdfWr.close(); 
     
    return true; 
  } 
  /** 
   * 
   * @param source 源文件 
   * @param target 目標(biāo)文件 
   * @param x 讀取源文件中的第幾頁 
   */ 
  private static void pdfToJpg(String source,String target,int x) throws Exception { 
    //創(chuàng)建從中讀取和向其中寫入（可選）的隨機(jī)訪問文件流，R表示對(duì)其只是訪問模式 
    RandomAccessFile rea = new RandomAccessFile(new File(source), "r"); 
 
    //將流讀取到內(nèi)存中，然后還映射一個(gè)PDF對(duì)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); // 輸出到文件流  
    JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);  
    encoder.encode(tag); // JPEG編碼  
    out.close();     
  } 
  /** 
   * @param source 源PDF文件路徑 
   * @param target 保存PDF文件路徑 
   * @param pageNum 提取PDF中第pageNum頁 
   * @throws Exception  
   */ 
  private static void pdfExtraction(String source,String target,int pageNum) throws Exception{ 
    //1：創(chuàng)建PDF讀取對(duì)象 
    PdfReader pr = new PdfReader(source); 
    System.out.println("this document "+pr.getNumberOfPages()+" page"); 
     
    //2：將第page頁轉(zhuǎn)為提取，創(chuàng)建document對(duì)象 
    Document doc = new Document(pr.getPageSize(pageNum)); 
     
    //3：通過PdfCopy轉(zhuǎn)其單獨(dú)存儲(chǔ) 
    PdfCopy copy = new PdfCopy(doc, new FileOutputStream(new File(target))); 
    doc.open(); 
    doc.newPage(); 
     
    //4：獲取第1頁，裝載到document中。 
    PdfImportedPage page = copy.getImportedPage(pr,pageNum); 
    copy.addPage(page);  
     
    //5：釋放資源 
    copy.close(); 
    doc.close(); 
    pr.close(); 
  } 
  /** 
   * @param pdfFile 源PDF文件 
   * @param imgFile  圖片文件 
   */ 
  private static void jpgToPdf(File pdfFile,File imgFile) throws Exception { 
    //文件轉(zhuǎn)img 
    InputStream is = new FileInputStream(pdfFile); 
    ByteArrayOutputStream baos = new ByteArrayOutputStream(); 
    for(int i;(i=is.read())!=-1;) 
    { 
      baos.write(i); 
    } 
    baos.flush(); 
     
    //取得圖像的寬和高。 
    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轉(zhuǎn)pdf 
    Document doc = new Document(new Rectangle(width,height)); 
    PdfWriter pw = PdfWriter.getInstance(doc,new FileOutputStream(imgFile)); 
    doc.open(); 
    doc.add(img); 
     
    //釋放資源 
    System.out.println(doc.newPage()); 
    pw.flush(); 
    baos.close(); 
    doc.close(); 
    pw.close(); 
  } 
   
}