微信公众号开发——获取openId

微信公众号开发——获取用户openId

/** * * 获取用户openID * @param course * @return * @throws UnsupportedEncodingException */ @RequestMapping(value = "/obtainOpenid" , method = RequestMethod.POST) public String obtainOpenid(HttpServletRequest request, HttpServletResponse response) throws UnsupportedEncodingException{ ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes(); request = attributes.getRequest(); // 获取openid response.setContentType("text/html"); request.setCharacterEncoding("UTF-8"); response.setCharacterEncoding("UTF-8"); //String code = request.getParameter("code");//获取code String code = userCourse.getCode(); Map<String, String> params = new HashMap<String, String>(); params.put("appid", WXConfig.appid); params.put("secret",WXConfig.appSecret); params.put("grant_type", "authorization_code"); params.put("code", code); String result = HttpUtil.httpRequestToString( "https://api.weixin.qq.com/sns/oauth2/access_token", params); JSONObject jsonObject = JSONObject.fromObject(result); String openid = jsonObject.get("openid").toString(); return openid ; }

HttpUtil.httpRequestToString代码

public static String httpRequestToString(String url, Map<String, String> params) { String result = null; try { InputStream is = httpRequestToStream(url, params); BufferedReader in = new BufferedReader(new InputStreamReader(is, "UTF-8")); StringBuffer buffer = new StringBuffer(); String line = ""; while ((line = in.readLine()) != null) { buffer.append(line); } result = buffer.toString(); } catch (Exception e) { return null; } return result; }