Rumah >applet WeChat >pembangunan WeChat >微信公众号支付(一)如何获取用户openId
一、获取apikey,appsecret与商户号
注册公众号、商户号
二、获取用户的OpenId
1.设置【授权回调页面域名】
官方解释:用户在网页授权页同意授权给公众号后,微信会将授权数据传给一个回调页面,回调页面需在此域名下,以确保安全可靠。回调页面域名不支持IP地址。
2.用户同意授权
我是把这个url写在微信菜单下的,当进入这个页面的时候就让用户同意。注意:好像是静默授权的,用户不知道
1.url:
https://open.weixin.qq.com/connect/oauth/authorize?appid=appid&redirect_uri=url&response_type=code&scope=snsapi_userinfo&state=park#wechat_redirect
参数:appid:公众号的唯一标识
redirect_uri:重定向的url,就是授权后要跳转的页面
scope:应用授权作用域
snsapi_base:不弹出授权页面,直接跳转,只能获取用户openid
snsapi_userinfo:弹出授权页面,可通过openid拿到昵称、性别、所在地
state:重定向后带的参数
2.用户同意后会产生一个code,只有分钟时间的有效期。
String code = request.getParameter("code")
3.code换openId
/** * 常量类 * @author rory.wu * */ public class Constants { // 第三方用户唯一凭证 public static String appid = ""; // 第三方用户唯一凭证密钥 public static String appsecret = ""; //商户ID public static String mch_id=""; //获取openId public static String oauth_url = "https://api.weixin.qq.com/sns/oauth/access_token?appid=APPID&secret=SECRET&code=CODE&grant_type=authorization_code"; }
/** * 通用工具类 * @author rory.wu * @version . * @since 年月日 */ public class CommonUtil { private static Logger log = Logger.getLogger(CommonUtil.class); public static JSONObject httpsRequestToJsonObject(String requestUrl, String requestMethod, String outputStr) { JSONObject jsonObject = null; try { StringBuffer buffer = httpsRequest(requestUrl, requestMethod, outputStr); jsonObject = JSONObject.fromObject(buffer.toString()); } catch (ConnectException ce) { log.error("连接超时:"+ce.getMessage()); } catch (Exception e) { log.error("https请求异常:"+e.getMessage()); } return jsonObject; } private static StringBuffer httpsRequest(String requestUrl, String requestMethod, String output) throws NoSuchAlgorithmException, NoSuchProviderException, KeyManagementException, MalformedURLException, IOException, ProtocolException, UnsupportedEncodingException { URL url = new URL(requestUrl); HttpsURLConnection connection = (HttpsURLConnection) url.openConnection(); connection.setDoOutput(true); connection.setDoInput(true); connection.setUseCaches(false); connection.setRequestMethod(requestMethod); if (null != output) { OutputStream outputStream = connection.getOutputStream(); outputStream.write(output.getBytes("UTF-")); outputStream.close(); } // 从输入流读取返回内容 InputStream inputStream = connection.getInputStream(); InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-"); BufferedReader bufferedReader = new BufferedReader(inputStreamReader); String str = null; StringBuffer buffer = new StringBuffer(); while ((str = bufferedReader.readLine()) != null) { buffer.append(str); } bufferedReader.close(); inputStreamReader.close(); inputStream.close(); inputStream = null; connection.disconnect(); return buffer; } } /** * 获取用户的openId,并放入session * @param code 微信返回的code */ private void setOpenId(String code) { session.put("code", code); String oauth_url = Constants.oauth_url.replace("APPID", Constants.appid).replace("SECRET", Constants.appsecret).replace("CODE", String.valueOf(session.get("code"))); log.info("oauth_url:"+oauth_url); JSONObject jsonObject = CommonUtil.httpsRequestToJsonObject(oauth_url, "POST", null); log.info("jsonObject:"+jsonObject); Object errorCode = jsonObject.get("errcode"); if(errorCode != null) { log.info("code不合法"); }else{ String openId = jsonObject.getString("openid"); log.info("openId:"+openId); session.put("openId", openId); } } oauth_url返回的格式是: { "access_token":"ACCESS_TOKEN", "expires_in":, "refresh_token":"REFRESH_TOKEN", "openid":"OPENID", "scope":"SCOPE", "unionid": "o_bmasdasdsad_sgVthMZOPfL" } Code无效时: { "errcode": ,"errmsg":"invalid code" }
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