更新document新版本的内容

        Document是可版本化对象，在我们最初创建并check in一个新的document时，我们就初始化了一个新的版本，而当我们在将此版本check out编辑后进行check in，则我们便得到了该文档的一个新的版本。下面展现文档版本变化过程中添加文档内容和保留上个版本文档内容的过程。

	Connection conn = CEHelper.getConnection();
		CEHelper.pushSubject(conn, "Administrator", "filenet");
		ObjectStore os = CEHelper.getObjectStore(conn);
		
		Document doc = Factory.Document.fetchInstance(os, new Id("{1FC02DF6-7EDE-49BE-998A-801BB6012C75}"), null);
		Document doc0 = Factory.Document.fetchInstance(os, new Id("{1FC02DF6-7EDE-49BE-998A-801BB6012C75}"), null);
		
		logger.info(!doc.get_IsReserved());

		if(!doc.get_IsCurrentVersion()){
			doc = (Document)doc.get_CurrentVersion();
			doc0 = (Document)doc.get_CurrentVersion();
		}
		
		logger.info(!doc.get_IsReserved());
		if(!doc.get_IsReserved()){
			doc.checkout(ReservationType.EXCLUSIVE, null,null, doc.getProperties());
			doc.save(RefreshMode.REFRESH);
		}
		doc = (Document)doc.get_Reservation();
		
		logger.info(!doc.get_IsReserved());
		
		ContentElementList oldCEL = doc.get_ContentElements();
		logger.info(String.valueOf(oldCEL.size()));
		
		
		ContentElementList newCEL = Factory.ContentElement.createList();
		ContentTransfer ct = Factory.ContentTransfer.createInstance();
		try{
			ct.setCaptureSource(new FileInputStream("c:\\log4j1.log"));
		}catch(FileNotFoundException e){
			e.printStackTrace();
		}
		newCEL.add(ct);
		
		logger.info(doc0.get_ContentElements().size());
		InputStream is = doc0.accessContentStream(0);
		ContentTransfer ct2 = Factory.ContentTransfer.createInstance();
		ct2.setCaptureSource(is);
		newCEL.add(ct2);

		InputStream is3 = doc0.accessContentStream(1);
		ContentTransfer ct3 = Factory.ContentTransfer.createInstance();
		ct3.setCaptureSource(is3);
		newCEL.add(ct3);

		InputStream is4 = doc0.accessContentStream(1);
		ContentTransfer ct4 = Factory.ContentTransfer.createInstance();
		ct4.setCaptureSource(is4);
		newCEL.add(ct4);
		
		doc.set_ContentElements(newCEL);
		doc.save(RefreshMode.REFRESH);
		
		doc.checkin(AutoClassify.DO_NOT_AUTO_CLASSIFY, CheckinType.MAJOR_VERSION);
		doc.save(RefreshMode.REFRESH);
			
		
		CEHelper.popSubject();