spring java 获取webapp下文件路径

自己的代码-（无法找到文件）：

主要问题在于无法找到相应的文件，各位游客如果看到我的代码中有哪些问题请勇敢大声的指出来：

@RequestMapping("showAttachmentPDF")
public String showAttachmentPDF(Model model,HttpServletRequest req) {
HttpServletRequest request = TrustWebUtils.getRequest();
HttpServletResponse response =  TrustWebUtils.getReponse();
String fileName = request.getParameter("fileName");
String path = request.getContextPath();//   etrading
String path1="/resources/doc/protocol.pdf";

path += path1;
response.setContentType("application/pdf");
FileInputStream in;
OutputStream out;
try {
in = new FileInputStream(new File(path));
out = response.getOutputStream();
byte[] b = new byte[1024 * 8];
while ((in.read(b)) != -1) {
out.write(b);
}
out.flush();
in.close();
out.close();
} catch (FileNotFoundException e) {
throw new BusinessException("",MessageUtils.getMessage("找不到文件"));
} catch (IOException e) {
throw new BusinessException(MessageUtils.getMessage(ErrorCodes.FILE_DOWN_EXCEPTION));
}
return null;
}

网上摘抄的代码-（亲测可用）：

【出处】http://blog.csdn.net/fuyesunwang123/article/details/30241341

    @RequestMapping("/act/worldcup_schedule_time/imgdownload")
    @ResponseBody
    public String scheduleDownload(HttpServletRequest request, HttpServletResponse response, HttpSession session) {
        response.setCharacterEncoding("UTF-8");
        String downLoadName = "worldcup.jpg";
        InputStream input = null;
        try {
            request.setCharacterEncoding("UTF-8");
            //获取文件的路径
//            String url = session.getServletContext().getRealPath("/") + "resources\\images\\act\\worldcup_merge\\worldcup720.png";
            String url = session.getServletContext().getRealPath("/") + "resources/images/act/worldcup_merge/worldcup720.png";
            System.out.println(url);
            File file = new File(url);
            input = FileUtils.openInputStream(file);
            byte[] data = IOUtils.toByteArray(input);

            //System.out.println("文件名:"+downLoadName);
            response.reset();
            //设置响应的报头信息(中文问题解决办法)
            response.setHeader("content-disposition", "attachment;fileName=" + URLEncoder.encode(downLoadName, "UTF-8"));
            response.addHeader("Content-Length", "" + data.length);
            response.setContentType("image/png; charset=UTF-8");

            IOUtils.write(data, response.getOutputStream());
        } catch (Exception e) {
            logger.error("下载图片出错");
            if (input != null) {
                IOUtils.closeQuietly(input);
            }
        }
        return null;
    }