@Controller
@RequestMapping("/weixin")
public class WeixinOauth {
    /*
    * 第一：用户同意授权，获取 code
    * */
    @RequestMapping("/oauth")
    public void oauth(HttpServletResponse response) throws IOException {
        // 转发到获取access_token、openid方法
        // 例如：localhost:8080/项目名/getAccessToken
        redirectUri = URLEncoder.encode(redirectUri,"utf8");

        String url = "https://open.weixin.qq.com/connect/oauth2/authorize?" +
                "appid=" + WEIXIN_APPID +
                "&redirect_uri=" + redirectUri +
                "&response_type=code" +
                "&scope=snsapi_userinfo" +
                "&state=STATE" +
                "#wechat_redirect";

        response.sendRedirect(url);
    }
    /*
     * 根据 code 获取 access_token openid
     * */
    @RequestMapping("/getAccessToken")
    public String getAccessToken(HttpServletRequest request,HttpServletResponse response) throws IOException {
        String code = request.getParameter("code");

        //第二： 认证服务带着 code发送请求，得到 access_token openid
        String url = "https://api.weixin.qq.com/sns/oauth2/access_token?" +
                "appid=" + FINEMP_WEIXIN_APPID +
                "&secret=" + FINEMP_WEIXIN_APPSECRET +
                "&code=" + code +
                "&grant_type=authorization_code";
        JSONObject jsonObject = HttpClientUtils.doGet(url);
        String weixin_accessToken = jsonObject.getString("access_token");
        String weixin_openid = jsonObject.getString("openid");

        logger.info("jsonObject=====================:{}"+ jsonObject);

        // 第三：带着 openid 和 access_token 获取你的微信账号资源信息
        String urlUserInfo = "https://api.weixin.qq.com/sns/userinfo?" +
                "access_token=" + weixin_accessToken +
                "&openid=" + weixin_openid +
                "&lang=zh_CN";
        JSONObject userObject = HttpClientUtils.doGet(urlUserInfo);
        logger.info("userObject======================:"+userObject);
    }
   
}