部分代码

    /**
     * QQ回调
     * @param request
     * @return
     */
    @GetMapping("/qq/callback")
    public String qqcallback(HttpServletRequest request){
        try {
			HttpSession session = request.getSession();
			String code = request.getParameter("code");
			String state = request.getParameter("state");
			String uuid = (String) session.getAttribute("state");
 
			if(uuid != null){
			    if(!uuid.equals(state)){
			    	return "error";
			    }
			}
			//Step2：通过Authorization Code获取Access Token
			String backUrl = http + "/qq/callback";
			String url = "https://graph.qq.com/oauth2.0/token?grant_type=authorization_code"+
			        "&client_id=" + QQHttpClient.APPID +
			        "&client_secret=" + QQHttpClient.APPKEY +
			        "&code=" + code +
			        "&redirect_uri=" + backUrl;
			String access_token = QQHttpClient.getAccessToken(url);
			//Step3: 获取回调后的 openid 值
			url = "https://graph.qq.com/oauth2.0/me?access_token=" + access_token;
			String openid = QQHttpClient.getOpenID(url);
 
			//Step4：获取QQ用户信息
			url = "https://graph.qq.com/user/get_user_info?access_token=" + access_token +
			        "&oauth_consumer_key="+ QQHttpClient.APPID +
			        "&openid=" + openid;
			JSONObject jsonObject = QQHttpClient.getUserInfo(url);
			//也可以放到Redis和mysql中
			session.setAttribute("openid",openid);  //openid,用来唯一标识qq用户
			session.setAttribute("nickname",(String)jsonObject.get("nickname")); //QQ名
			session.setAttribute("figureurl_qq_2",(String)jsonObject.get("figureurl_qq_2")); //大小为100*100像素的QQ头像URL
			System.out.println(jsonObject.toJSONString());
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
			System.out.println("--------------error");
		}
        return "redirect:/home";
    }