private static String loadJson() {
		StringBuilder sb = new StringBuilder("");
		try {
	        BufferedReader in = new BufferedReader(new FileReader(USER_DIR + "/resources/config.json"));
	        String str = "";
	        while ((str = in.readLine()) != null) {
	        	int contentIndex = str.indexOf("//");		// 处理行注释
	        	if (contentIndex != -1) {
	        		str = str.substring(0, contentIndex);
	        	}
	        	sb.append(str);
	        }
	        in.close();
	    } catch (IOException e) {
	    	System.out.println("找不到配置文件:" + USER_DIR + "/resources/config.json");
	    }
		return sb.toString();
	}