public String strBuffParams(Map<String, String> params){

// 构建请求参数

String strSub=null;

StringBuffer sb = new StringBuffer();

if (params != null) {

for (Entry<String, String> e : params.entrySet()) {

if(StringUtils.isNotEmpty(e.getValue())){

sb.append(e.getKey());

sb.append("=");

sb.append(e.getValue());

sb.append("&"); }

}

strSub= sb.substring(0, sb.length() - 1);

}

return strSub;

}