话说遇到这个问题真是比较坑爹，微博的API还真有特点。
报错信息：
error":"invalid_request","error_code":21323,"request":"/oauth2/access_token","error_uri":"/oauth2/access_token","error_description":"miss client id or secret“
解决方案:
参照文档：http://open.weibo.com/wiki/OAuth2/access_token，这里写的是POST提交，但是这里的post的URL为
https://api.weibo.com/oauth2/access_token?client_id=client_id&client_secret=client_secret&grant_type=authorization_code&code=code&redirect_uri=redirect_uri
提交的data应该为空
参考代码：
// 获取access_token
String url = "https://api.weibo.com/oauth2/access_token?client_id=" + OtherConfig.WEIBO_APP_ID+ "&client_secret=" + OtherConfig.WEIBO_APP_SECRET+ "&grant_type=authorization_code&code="+code+"&redirect_uri="+OtherConfig.WEIBO_BACK_URI;
HttpPost httpPost = new HttpPost(url);
JSONObject json = new JSONObject();
String response = HttpClientUtils.doPost(httpPost, json.toJSONString());
成功解决，这里的data必须为空
