package com.wonders.stpt.attach.action; import java.awt.Image;import java.awt.Rectangle;import java.awt.image.BufferedImage;import java.io.File;import java.io.FileInputStream;import java.io.FilenameFilter;import java.io.FileOutputStream;import java.io.InputStream;import java.io.OutputStream;import java.io.RandomAccessFile;import java.nio.ByteBuffer;import java.nio.channels.FileChannel;import java.util.Arrays;import java.util.Comparator;import javax.imageio.*; import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse; import org.apache.struts2.convention.annotation.Action;import org.apache.struts2.convention.annotation.Namespace;import org.apache.struts2.convention.annotation.ParentPackage;import org.apache.struts2.convention.annotation.Result;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.beans.factory.annotation.Qualifier;import org.springframework.context.annotation.Scope;import org.springframework.stereotype.Component; import com.sun.image.codec.jpeg.JPEGCodec; import com.sun.image.codec.jpeg.JPEGImageEncoder;import com.sun.pdfview.PDFFile;import com.sun.pdfview.PDFPage;import com.wonders.stpt.attach.model.vo.UploadFile;import com.wonders.stpt.attach.service.FjshService;import com.wonders.stpt.userMsg.action.AbstractParamAction;   @SuppressWarnings("serial")@ParentPackage("struts-default")@Namespace(value="/attach")@Component("attachViewerAction")@Scope("prototype")public class AttachViewerAction extends AbstractParamAction{  private FjshService fjshService; private final int maxPage = 30;   public FjshService getFjshService() { return fjshService; }  @Autowired(required=false) public void setFjshService(@Qualifier("fjshService")FjshService fjshService) { this.fjshService = fjshService; }   /** * PDF文檔在線以圖片格式預覽. *  */ @Action(value="/pdfPreview",results={@Result(name="pdf",location="/attachPreview/pdfViewer.jsp")}) public String pdfPreview() { //按fileId查找出該文件的路徑以及文件名. //該部分代碼copy自附件上傳組件  HttpServletRequest request = servletRequest; HttpServletResponse response = servletResponse;  String fileId = request.getParameter("fileId"); if("".equals(fileId) || null == fileId) {  servletRequest.setAttribute("state", "f");  return "pdf"; }  UploadFile upFile = this.fjshService.loadFileById(fileId); if(upFile == null) {  servletRequest.setAttribute("state", "f");  return "pdf"; } String path = upFile.getPath();   // 文件所在磁盤路徑. String fileName = upFile.getFileAllName(); // 真實文件名. String saveFileName = upFile.getSaveFileName(); // 磁盤上的文件名. String version = upFile.getVersion(); if ("old".equals(request.getParameter("ver"))){  if (version != null){  saveFileName = saveFileName.replace(".dat","_v"+version+".dat");  } }  //當前應用絕對路徑 String appPath = request.getSession().getServletContext().getRealPath ("");   String imageSavePath = appPath + "//preview_images//";    //按照文件路徑讀取PDF文檔，并將其按頁轉換為圖片  String filePath = path + saveFileName ;  if(filePath == null || "".equals(filePath)) {  servletRequest.setAttribute("state", "f");  return "pdf"; }else {  PDFFile pdfFile = this.getPdfFile(filePath);  if(this.pdf2Images(pdfFile,imageSavePath,String.valueOf(upFile.getId()))) { //如果轉換成功  return "pdf";  }else {  servletRequest.setAttribute("state", "f");  return "pdf";  }    }   }  /** * 圖片文件在線預覽 *  */ @Action(value="/imagePreview",results={@Result(name="image",location="/attachPreview/imageViewer.jsp")}) public String imagePreview() { //按fileId查找出該文件的路徑以及文件名. //該部分代碼copy自附件上傳組件  HttpServletRequest request = servletRequest; HttpServletResponse response = servletResponse;  String fileId = request.getParameter("fileId"); if("".equals(fileId) || null == fileId) {  servletRequest.setAttribute("state", "f");  return "image"; }  UploadFile upFile = this.fjshService.loadFileById(fileId); if(upFile == null) {  servletRequest.setAttribute("state", "f");  return "image"; } String path = upFile.getPath();   // 文件所在磁盤路徑. String fileName = upFile.getFileAllName(); // 真實文件名. String saveFileName = upFile.getSaveFileName(); // 磁盤上的文件名. String version = upFile.getVersion(); if ("old".equals(request.getParameter("ver"))){  if (version != null){  saveFileName = saveFileName.replace(".dat","_v"+version+".dat");  } }  //當前應用絕對路徑 String appPath = request.getSession().getServletContext().getRealPath ("");   String imageSavePath = appPath + "//preview_images//";    //按照文件路徑讀取文件 String filePath = path + saveFileName ; if(filePath == null || "".equals(filePath)) {  servletRequest.setAttribute("state", "f");  return "image"; }else {  //如果成功讀取文件  String imageName = String.valueOf(upFile.getId());  String extName = upFile.getFileExtName();  if(getImageFile(filePath,imageSavePath,imageName,extName)) {  return "image";  }else {  servletRequest.setAttribute("state", "f");  return "image";  }  }  }  /** * image文件讀取.  * @param filePath -- 待讀取文件的路徑. * @param imageSavePath -- 圖片保存路徑. * @param imageName -- 圖片文件保存后的文件名稱（包括后綴）. * @return boolean instance. */ private boolean getImageFile(String filePath,String imageSavePath,String dirName,String extName) {  String path = imageSavePath + dirName + "//"; File file = new File(path); if(!file.exists()){ //判斷以文件名命名的文件夾是否存在.  file.mkdirs(); }  try {  InputStream is = new FileInputStream(filePath);    String imagePath = path + dirName + "." + extName;  FileOutputStream os = new FileOutputStream(imagePath); // 輸出到文件流.  byte[] buffer = new byte[1024];  int n = 0;  while ((n = is.read(buffer, 0, 1024)) > 0) {  os.write(buffer, 0, n);  }  os.close();  is.close();   } catch (Exception ex) {  ex.printStackTrace();  return false; }   servletRequest.setAttribute("state", "s"); servletRequest.setAttribute("dirName", dirName); servletRequest.setAttribute("imageName", dirName + "." + extName); return true; }  /** * PDF文檔讀取.  * @param filePath -- 待讀取PDF文件的路徑. * @return null 或者 PDFFile instance. */ private PDFFile getPdfFile(String filePath) { try {  //load a pdf file from byte buffer.  File file = new File(filePath);  RandomAccessFile raf = new RandomAccessFile(file, "r");  FileChannel channel = raf.getChannel();  ByteBuffer buf = channel.map(FileChannel.MapMode.READ_ONLY, 0,   channel.size());  PDFFile pdfFile = new PDFFile(buf);   return pdfFile; } catch (Exception ex) {  ex.printStackTrace(); } return null; }  /** * PDF文檔按頁轉換為圖片. * @param pdfFile -- PDFFile instance * @param imageSavePath -- 圖片保存路徑. * @param fileName -- 保存圖片文件夾名稱. */  private boolean pdf2Images(PDFFile pdfFile,String imageSavePath,String fileName) { if(pdfFile == null ) { //待轉換文檔不存在，返回false.  return false; }  //將轉換后圖片存放于path路徑下  String path = imageSavePath + fileName + "//"; File filePath = new File(path); if(!filePath.exists()){ //判斷以文件名命名的文件夾是否存在.  filePath.mkdirs(); }  //取得當前文件夾下的所有jpg格式的文件名. String[] imageNames = filePath.list(new ImageFilter());  if(imageNames.length == 0) { //當前文件夾下沒有文件.  //將pdf文檔按頁轉為圖片.  String imagePath = "";  try {  //對轉換頁數進行限制,最多只轉換前maxPage頁.  int pages = pdfFile.getNumPages();  if(pages > maxPage){   pages = maxPage;  }    for (int i = 1; i <= pages; i++) {   // draw the page to an image   PDFPage page = pdfFile.getPage(i);   // get the width and height for the doc at the default zoom   Rectangle rect = new Rectangle(0,         0,         (int) page.getBBox().getWidth(),         (int) page.getBBox().getHeight());   // generate the image   Image img = page.getImage(rect.width, rect.height, // width & height       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);         imagePath = path + i + ".jpg";   FileOutputStream out = new FileOutputStream(imagePath); // 輸出到文件流.   JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);   encoder.encode(tag);  // JPEG編碼.   out.close();  }    }catch (Exception ex) {  ex.printStackTrace();  return false;  } }  //取得當前文件夾下的所有jpg格式的文件名. imageNames = filePath.list(new ImageFilter()); //對文件名排序. Arrays.sort(imageNames,new FileNameComparator());  servletRequest.setAttribute("state", "s"); servletRequest.setAttribute("fileName", fileName); servletRequest.setAttribute("imageNames", imageNames);  return true; }  //圖片后綴名過濾類  //圖片jpg過濾器類 class ImageFilter implements FilenameFilter {  public boolean isImageFile(String fileName){   if(fileName.toLowerCase().endsWith("jpg")) {   return true;   }else {   return false;   }    }    public ImageFilter() {}    public boolean accept(File dir,String name){  return isImageFile(name);  } }  //文件名稱比較類  class FileNameComparator implements Comparator { public final int compare(Object first, Object second) {   String[] fir = ((String)first).split("//.");   String[] sec = ((String)second).split("//.");      int firstPage = Integer.parseInt(fir[0]);   int secondPage = Integer.parseInt(sec[0]);   int diff = firstPage - secondPage;   if (diff > 0)   return 1;   if (diff < 0)   return -1;   else   return 0; } }}