web应用读取webRoot中的文件

private String getTxT(HttpServlet servlet, String fileName){
		String result = "";
		try {
			// D:\apache-tomcat-6.0.18\webapps\web_pro_name\  
			String projectPath = servlet.getServletContext().getRealPath("/");  
			String filePath = projectPath+fileName;
			FileReader reader;
			reader = new FileReader(filePath);
			BufferedReader br = new BufferedReader(reader);
			String s = null;
			while ((s = br.readLine()) != null) {
				result += s;
			}
			br.close();
			reader.close();
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return result;
	}