Author webpage authorization developed by WeChat

var center = {
        init: function(){
            .....
        },
        enterWxAuthor: function(){
            var wxUserInfo = localStorage.getItem("wxUserInfo");
            if (!wxUserInfo) {
                var code = common.getUrlParameter('code');
                if (code) {
                    common.getWxUserInfo();
                    center.init();
                }else{
                    //没有微信用户信息，没有授权-->> 需要授权，跳转授权页面
                    window.location.href = 'https://open.weixin.qq.com/connect/oauth2/authorize?appid='+ WX_APPID +'&redirect_uri='+ window.location.href +'&response_type=code&scope=snsapi_userinfo#wechat_redirect';
                }
            }else{
                center.init();
            }
        }
}
$(document).ready(function() { 
    center.enterWxAuthor();
}

/**
     * 授权后获取用户的基本信息
     */
    getWxUserInfo:function(par){
        var code = common.getUrlParameter("code");
        
        if (par) code = par;
        
        $.ajax({
            async: false,
            data: {code:code},
            type : "GET",
            url : WX_ROOT + "wechat/authorization",
            success : function(json) {
                if (json){
                    try {
                        //保证写入的wxUserInfo是正确的
                        var data = JSON.parse(json);
                        if (data.openid) {
                            localStorage.setItem('wxUserInfo',json);//写缓存--微信用户信息
                        }
                    } catch (e) {
                        // TODO: handle exception
                    }
                }
            }
        });
    },

　　/**
     * 微信授权
     * @param code 使用一次后失效
     * 
     * @return 用户基本信息
     * @throws IOException 
     */
    @RequestMapping(value = "/authorization", method = RequestMethod.GET)    public void authorizationWeixin(
            @RequestParam String code,
            HttpServletRequest request, 
            HttpServletResponse response) throws IOException{
        request.setCharacterEncoding("UTF-8");  
        response.setCharacterEncoding("UTF-8"); 

        PrintWriter out = response.getWriter();
        LOGGER.info("RestFul of authorization parameters code:{}",code);        
        try {
            String rs = wechatService.getOauthAccessToken(code);
            out.write(rs);
            LOGGER.info("RestFul of authorization is successful.",rs);
        } catch (Exception e) {
            LOGGER.error("RestFul of authorization is error.",e);
        }finally{
            out.close();
        }
    }

　　/**
     * 根据code 获取授权的token 仅限授权时使用，与全局的access_token不同
     * @param code
     * @return
     * @throws IOException 
     * @throws ClientProtocolException 
     */
    public String getOauthAccessToken(String code) throws ClientProtocolException, IOException{
        String data = redisService.get("WEIXIN_SQ_ACCESS_TOKEN");
        String rs_access_token = null;
        String rs_openid = null;
        String url = WX_OAUTH_ACCESS_TOKEN_URL + "?appid="+WX_APPID+"&secret="+WX_APPSECRET+"&code="+code+"&grant_type=authorization_code";        if (StringUtils.isEmpty(data)) {            synchronized (this) {                //已过期，需要刷新
                String hs = apiService.doGet(url);
                JSONObject json = JSONObject.parseObject(hs);
                String refresh_token = json.getString("refresh_token");
    
                String refresh_url = "https://api.weixin.qq.com/sns/oauth2/refresh_token?appid="+WX_APPID+"&grant_type=refresh_token&refresh_token="+refresh_token;
                String r_hs = apiService.doGet(refresh_url);
                JSONObject r_json = JSONObject.parseObject(r_hs);
                String r_access_token = r_json.getString("access_token");
                String r_expires_in = r_json.getString("expires_in");
                rs_openid = r_json.getString("openid");
                
                rs_access_token = r_access_token;
                redisService.set("WEIXIN_SQ_ACCESS_TOKEN", r_access_token, Integer.parseInt(r_expires_in) - 3600);
                LOGGER.info("Set sq access_token to redis is successful.parameters time:{},realtime",Integer.parseInt(r_expires_in), Integer.parseInt(r_expires_in) - 3600);
            }
        }else{            //还没有过期
            String hs = apiService.doGet(url);
            JSONObject json = JSONObject.parseObject(hs);
            rs_access_token = json.getString("access_token");
            rs_openid = json.getString("openid");
            LOGGER.info("Get sq access_token from redis is successful.rs_access_token:{},rs_openid:{}",rs_access_token,rs_openid);
        }        
        return getOauthUserInfo(rs_access_token,rs_openid);
    }
　　/**
     * 根据授权token获取用户信息
     * @param access_token
     * @param openid
     * @return
     */
    public String getOauthUserInfo(String access_token,String openid){
        String url = "https://api.weixin.qq.com/sns/userinfo?access_token="+ access_token +"&openid="+ openid +"&lang=zh_CN";        
        try {
            String hs = apiService.doGet(url);            
            //保存用户信息            
            saveWeixinUser(hs);            
            return hs;
        } catch (IOException e) {
            LOGGER.error("RestFul of authorization is error.",e);
        }        
        return null;
    }