微信回调报文解析, 获取请求体内容

/**
     * 获取请求体内容
     * @param request
     * @return
     */
    private String getBody(HttpServletRequest request) {
        BufferedReader reader;
        String body = "";
        try {
            reader = request.getReader();
            String line;
            StringBuffer inputString = new StringBuffer();
            while ((line = reader.readLine()) != null) {
                inputString.append(line);
            }
            body = inputString.toString();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return body;
    }