Java BlobInfoFactory.loadBlobInfo方法代码示例

import com.google.appengine.api.blobstore.BlobInfoFactory; //导入方法依赖的package包/类
@Override
public FileInfo getFileInfo(HttpServletRequest req) {
	Map<String, BlobKey> blobs = blobstoreService.getUploadedBlobs(req);
    if (blobs.keySet().isEmpty()) { 
    	throw new RuntimeException("No File found"); 
    }
    Iterator<String> names = blobs.keySet().iterator();
    String blobName = names.next();
    BlobKey blobKey = blobs.get(blobName);
    BlobInfoFactory blobInfoFactory = new BlobInfoFactory();
    BlobInfo blobInfo = blobInfoFactory.loadBlobInfo(blobKey);

    FileInfo fileInfo = new FileInfo();
    fileInfo.setFileName(blobInfo.getFilename());
    fileInfo.setContentType(blobInfo.getContentType());
    fileInfo.setSize(blobInfo.getSize());
    
	return fileInfo;
}
 

import com.google.appengine.api.blobstore.BlobInfoFactory; //导入方法依赖的package包/类
/**
    * Respond to servlet GET requests
    */
   public void doGet(HttpServletRequest req, HttpServletResponse resp)
           throws IOException {
   	
    // Lets check the action required by the jsp
    String message = req.getParameter("msg");
    String action = req.getParameter("action");

    if (message.equals("success")) {
    	
    	// We return information about the file in JSON format
    	if (action.equalsIgnoreCase("upload")) {
    		
    		String type = req.getParameter("type");
    		String datastoreObjectKeyString = 
    				req.getParameter("datastoreObjectKey");
    		Key datastoreObjectKey = KeyFactory.stringToKey(datastoreObjectKeyString);
    		BlobKey fileKey = null;
    		String fileKeyString = null;
    		String jsonString = null;
    		
    		// Check type
    		if (type.equalsIgnoreCase("audio_music") || 
    				type.equalsIgnoreCase("audio_voice")) {
    			
    			StationAudio stationAudio = 
    					StationAudioManager.getStationAudio(datastoreObjectKey);
    			
    			fileKey = stationAudio.getStationAudioMultimediaContent();
    		}
    		else if (type.equalsIgnoreCase("image")) {
    			StationImage stationImage = 
    					StationImageManager.getStationImage(datastoreObjectKey);
    			
    			fileKey = stationImage.getStationImageMultimediaContent();
    		}
    		
    		fileKeyString = fileKey.getKeyString();
	    	BlobInfoFactory bif = new BlobInfoFactory();
	    	BlobInfo blobInfo = bif.loadBlobInfo(fileKey);
	    	String fileName = blobInfo.getFilename();
	    	
	    	jsonString = "{" + "\n" +
	    			"\"datastoreObjectKey\":" + "\"" + datastoreObjectKeyString + "\"," + "\n" +
	    			"\"fileKey\":" + "\"" + fileKeyString + "\"," + "\n" +
	    			"\"fileName\":" + "\"" + fileName + "\"\n" +
	    			"}";
	    	
	    	log.info("jsonString: " + jsonString);
	    	
	    	resp.setContentType("application/json;charset=UTF-8");
	    	resp.setCharacterEncoding("UTF-8");
	    	resp.getWriter().println(jsonString);
    	}
    	else if (action.equals("delete")){
    		resp.getWriter().println("File deleted successfully.");
    	}
    }
}
 

import com.google.appengine.api.blobstore.BlobInfoFactory; //导入方法依赖的package包/类
public void doPost(HttpServletRequest req, HttpServletResponse resp) throws
    IOException {

  UserService userService = UserServiceFactory.getUserService();
  User user = userService.getCurrentUser();

  Map<String, BlobKey> blobs = blobstoreService.getUploadedBlobs(req);
  if (blobs.keySet().isEmpty()) {
    resp.sendRedirect("/?error=" + 
      URLEncoder.encode("No file uploaded", "UTF-8"));
    return;
  }

  Iterator<String> names = blobs.keySet().iterator();
  String blobName = names.next();
  BlobKey blobKey = blobs.get(blobName);

  if (user == null) {
    blobstoreService.delete(blobKey);
    resp.sendRedirect("/?error=" + 
      URLEncoder.encode("Must be logged in to upload", "UTF-8"));
    return;
  }

  BlobInfoFactory blobInfoFactory = new BlobInfoFactory();
  BlobInfo blobInfo = blobInfoFactory.loadBlobInfo(blobKey);

  String contentType = blobInfo.getContentType();
  long size = blobInfo.getSize();
  Date creation = blobInfo.getCreation();
  String fileName = blobInfo.getFilename();

  String title = req.getParameter("title");
  String description = req.getParameter("description");
  boolean isShared = "public".equalsIgnoreCase(req.getParameter("share"));

  try {
    MediaObject mediaObj = new MediaObject(user, blobKey, creation, 
      contentType, fileName, size, title, description, isShared);
    PMF.get().getPersistenceManager().makePersistent(mediaObj);
    resp.sendRedirect("/");
  } catch (Exception e) {
    blobstoreService.delete(blobKey);
    resp.sendRedirect("/?error=" + 
      URLEncoder.encode("Object save failed: " + e.getMessage(), "UTF-8"));
  }
}