文件上传

		uploadify链接 http://www.cnblogs.com/mofish/archive/2012/11/30/2796698.html
		//前端代码
		<form id="id1" method="post" action="javascript:;"
			enctype="multipart/form-data">
			<table>
				<tr class="hidden">
		             <td>
		             	<input type="hidden" id="sessionid" value="${pageContext.session.id}" />
		             </td>
           		</tr>
				<tr>
					<td><span class="TextFont">文件上传：</span></td>
				<td align="left" colspan="4">
					<input id="id2" name="file_upload" type="file">
					<div id="id3"></div>
					<a href="#" class="button" id="id4">上传</a>| 
         			<a href="#" class="button" id="id5">取消上传</a>	|
				</td>
				</tr>
			</table>
		</form>
		
		
		MultipartFile file = FileOperate.getFile(request);
		
		long size = file.getSize();
		long limit = 110000;
		//判断上传文档的大小
		if(size>limit)
		{
			throw new BusinessException2("SIZE_EXCESS");
		}
		
		if(!StringUtils.isEmpty(pageAllowed)){
			int pageSize=Integer.parseInt(pageAllowed);
			String filename=file.getOriginalFilename();
			String suffix = filename.substring(filename.lastIndexOf('.') + 1);
			//判断是不是PDF格式的文档
			if((pageSize!=0)&&(!("PDF".equals(suffix.toUpperCase())))){
				throw new BusinessException2("PDFLIMIT_ERROR");
			}
		}
		
		
		//文件、路径名、文件名
		public static Boolean upload(MultipartFile file, String path, String fileName) {
        if (file == null) {
            return false;
        } else {
            try {

                File newFile = new File(path, fileName);
                InputStream is = file.getInputStream();
                FileUtils.copyInputStreamToFile(is, newFile);

            } catch (IOException e) {
                System.out.println(e.getMessage());
                e.printStackTrace();
                return false;
            }
            return true;
        }
    }