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。
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String code = request.getParameter( "code" ) |
3.code换openId
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/** * 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" ; } |
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/** * 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" } |
以上内容就是服务器之家的小编给大家分享的微信公众号支付(一)如何获取用户openId,希望大家喜欢。