spring - 无法使用 Spring 3.x 访问文件资源

Question

我一直试图打开这个 .json 文件一段时间，它给了我一个空指针异常。如果我做错了什么，请告诉我。

/**
 * Handles requests for the application UI.
 */
@Controller
@RequestMapping("/UIController")
public class UIController {

private static final Logger logger = LoggerFactory.getLogger(UIController.class);
private @Autowired ServletContext servletContext;

@RequestMapping(value = "/ClientTree", method = RequestMethod.GET)
public @ResponseBody String clientTree() throws IOException {
    InputStream inputStream = null;
    try {
        inputStream = servletContext.getResourceAsStream("C:\\ClientJson.json");
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
        return bufferedReader.readLine();
    } finally {
        if (inputStream != null) {
           inputStream.close();
        }
    }
}
}

我正在尝试打开并读取文件内容，将这些内容发送到 UI 以填充树 jQuery 小部件。