【支付专区】之微信支付构建请求参数xml

/**
     * <p>Desc:weChat构建请求参数</p>
     * <p>参数名ASCII码从小到大排序（字典序)</p>
     * @param params
     * @return
     */
    public static String buildBodyXml(Map<String,Object> params){
        SortedMap<String,Object> sort=new TreeMap<String,Object>(params);  
         Set<String> keySet = sort.keySet();
        StringBuilder sb = new StringBuilder("<xml>");
        for (Object key : keySet) {
            sb.append(String.format("<%s>%s</%s>", key, params.get(key), key));
        }
        sb.append("</xml>");
        return sb.toString();
    }