授權步驟：

1、引導使用者進入授權頁面同意授權，獲取code 

2、通過code換取網頁授權access_token（與基礎支援中的access_token不同） 

3、通過網頁授權access_token和openid獲取使用者基本資訊

Java實現：

1、引導使用者進入授權頁面同意授權，獲取code 

    這一步其實就是將需要授權的頁面url拼接到微信的認證請求接口裡面，比如需要使用者在訪問頁面 lovebread.tunnel.qydev.com/auth 時進行授權認證，那麼拼接後的授權驗證地址為：

    https://open.weixin.qq.com/connect/oauth2/authorize?appid=wx88888888

    這裡面需要替換appid、redirect_uri為實際的資訊。其中的scope引數有兩個值：

    snsapi_base：只能獲取到使用者openid。好處是靜預設證，無需使用者手動點選認證按鈕，感覺上像是直接進入網站一樣。

    snsapi_userinfo：可以獲取到openid、暱稱、頭像、所在地等資訊。需要使用者手動點選認證按鈕。

相關程式碼：

   /**
     * 生成用於獲取access_token的Code的Url
     *
     * @param redirectUrl
     * @return
     */
    public String getRequestCodeUrl(String redirectUrl) {
        return String.format("https://open.weixin.qq.com/connect/oauth2/authorize?appid=%s&redirect_uri=%s&response_type=code&scope=%s&state=%s#wechat_redirect",
                             APPID, redirectUrl, 
 
"snsapi_userinfo", "xxxx_state");
    }

2、通過第一步獲取的code換取網頁授權access_token（與基礎支援中的access_token不同） 

    這一步需要在控制器中獲取微信回傳給我們的code，通過這個code來請求access_token。

   /**
     * 路由控制
     * 
     * @param request
     * @param code
     * @return 
     */
    @GET
    @Path("auth")
    public Response auth(@Context HttpServletRequest request,
                         @QueryParam("code") String code) {
        Map<String, String> data = new HashMap();
        Map<String, String> result = wechatUtils.getUserInfoAccessToken(code);//通過這個code獲取access_token
        String openId = result.get("openid");
        if (StringUtils.isNotEmpty(openId)) {
            logger.info("try getting user info. [openid={}]", openId);
            Map<String, String> userInfo = wechatUtils.getUserInfo(result.get("access_token"), openId);//使用access_token獲取使用者資訊
            logger.info("received user info. [result={}]", userInfo);
            return forward("auth", userInfo);
        }
        return Response.ok("openid為空").build();
    }

   /**
     * 獲取請求使用者資訊的access_token
     *
     * @param code
     * @return
     */
    public Map<String, String> getUserInfoAccessToken(String code) {
        JsonObject object = null;
        Map<String, String> data = new HashMap();
        try {
            String url = String.format("https://api.weixin.qq.com/sns/oauth2/access_token?appid=%s&secret=%s&code=%s&grant_type=authorization_code",
                                       APPID, APPSECRET, code);
            logger.info("request accessToken from url: {}", url);
            DefaultHttpClient httpClient = new DefaultHttpClient();
            HttpGet httpGet = new HttpGet(url);
            HttpResponse httpResponse = httpClient.execute(httpGet);
            HttpEntity httpEntity = httpResponse.getEntity();
            String tokens = EntityUtils.toString(httpEntity, "utf-8");
            Gson token_gson = new Gson();
            object = token_gson.fromJson(tokens, JsonObject.class);
            logger.info("request accessToken success. [result={}]", object);
            data.put("openid", object.get("openid").toString().replaceAll("\"", ""));
            data.put("access_token", object.get("access_token").toString().replaceAll("\"", ""));
        } catch (Exception ex) {
            logger.error("fail to request wechat access token. [error={}]", ex);
        }
        return data;
    }

請求access_token返回樣例：

[result={
"access_token":"OezXcEiiBSKSxW0eoylIeK6mXnzDdGmembMkERL1o1PtpJBEFDaCSwseSTzvZhiKK7Q35O-YctaOFfyJYSPMMEsMq62zw8T6VDljgKJY6g-tCMdTr3Yoeaz1noL6gpJeshMPwEXL5Pj3YBkw",
"expires_in":7200,
"refresh_token":"OezXcEiiBSKSxW0eoylIeK6mXnzDdGmembMkERL1o1PtpJBEFDaCSwseSTOIGqz3ySJRe-lv124wxxtrBdXGd3X1YGysFJnCxjtIE-jaMkvT7aN-12nBa4YtDvr5VSKCU-_UeFFnfW0K3JmZGRA",
"openid":"oN9UryuC0Y01aQt0jKxZXbfe658w",
"scope":"snsapi_userinfo"}]

通過access_token和openid獲取使用者基本資訊:

   /**
     * 獲取使用者資訊
     *
     * @param accessToken
     * @param openId
     * @return
     */
    public Map<String, String> getUserInfo(String accessToken, String openId) {
        Map<String, String> data = new HashMap();
        String url = "https://api.weixin.qq.com/sns/userinfo?access_token=" + accessToken + "&openid=" + openId + "&lang=zh_CN";
        logger.info("request user info from url: {}", url);
        JsonObject userInfo = null;
        try {
            DefaultHttpClient httpClient = new DefaultHttpClient();
            HttpGet httpGet = new HttpGet(url);
            HttpResponse httpResponse = httpClient.execute(httpGet);
            HttpEntity httpEntity = httpResponse.getEntity();
            String response = EntityUtils.toString(httpEntity, "utf-8");
            Gson token_gson = new Gson();
            userInfo = token_gson.fromJson(response, JsonObject.class);
            logger.info("get userinfo success. [result={}]", userInfo);
            data.put("openid", userInfo.get("openid").toString().replaceAll("\"", ""));
            data.put("nickname", userInfo.get("nickname").toString().replaceAll("\"", ""));
            data.put("city", userInfo.get("city").toString().replaceAll("\"", ""));
            data.put("province", userInfo.get("province").toString().replaceAll("\"", ""));
            data.put("country", userInfo.get("country").toString().replaceAll("\"", ""));
            data.put("headimgurl", userInfo.get("headimgurl").toString().replaceAll("\"", ""));
        } catch (Exception ex) {
            logger.error("fail to request wechat user info. [error={}]", ex);
        }
        return data;
    }

獲取使用者資訊返回樣例：

[result={
"openid":"oN9UryuC0Y01aQt0jKxZXbfe658w",
"nickname":"lovebread",
"sex":1,
"language":"zh_CN",
"city":"",
"province":"",
"country":"中國",
"headimgurl":"http://wx.qlogo.cn/mmopen/bRLXzTf2f6HNfBTd72heAA7vNKsGKvK3dfreewrewsPff9OaMWib0GibbA8daQmNQvQhagtiaicf4vNC5nYU3ia821QQ/0",
"privilege":[]}]