/**
     *  读文件
     * @param jsonPath 文件所在路径
     * @return
     */
    public static String readJson(String jsonPath){
        String jsonStr = "";
        try {
            File file = new File(jsonPath);
            FileReader fileReader = new FileReader(file);
//            Reader reader = new InputStreamReader(new FileInputStream(file),"Utf-8");
            Reader reader = new InputStreamReader(new FileInputStream(file));
            int ch = 0;
            StringBuffer sb = new StringBuffer();
            while ((ch = reader.read()) != -1) {
                sb.append((char) ch);
            }
            fileReader.close();
            reader.close();
            jsonStr = sb.toString();
            return jsonStr;
        } catch (Exception e) {
            return null;
        }
    }

    /**
     * 写文件
     * @param path json文件路径
     * @param str json数据
     * @return
     * @throws IOException
     */
    public static void writeJson(String path,String str) throws IOException {
        FileWriter fw = new FileWriter(path);
        PrintWriter out = new PrintWriter(fw);
        out.write(str);
        out.println();
        fw.close();
        out.close();
    }

    /**
     * 删除文件
     *
     * @param filePath 文件
     * @return
     */
    public static boolean deleteFile(String filePath) {
        boolean flag = false;
        File file = new File(filePath);
        // 路径为文件且不为空则进行删除
        if (file.isFile() && file.exists()) {
            file.delete();
            flag = true;
        }
        return flag;
    }

    /**
     * 百分号编码工具方法
     *
     * @param s 需要百分号编码的字符串
     * @return 百分号编码后的字符串
     */
    public static String percentEncode(String s) throws UnsupportedEncodingException {
        String encode = URLEncoder.encode(s, StandardCharsets.UTF_8.toString());
        return encode.replaceAll("\\+", "%20");
    }