WeChat official account payment (1) How to obtain user openId

1. Obtain the apikey, appsecret and merchant number

Register the public account and merchant number

2. Obtain the user’s OpenId

1. Set the [authorization callback page domain name]

Official explanation: After the user agrees to authorize the official account on the web authorization page, WeChat will pass the authorization data to a callback page, and the callback page needs to be here domain name to ensure safety and reliability. The callback page domain name does not support IP addresses.

## 2. User agrees to authorize

I wrote this URL under the WeChat menu, and when entering this page, the user will agree. Note: It seems to be authorized silently, the user does not know

　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

Parameters: appid: The unique identifier of the official account

Redirect_uri: The redirected url is the page to be redirected after authorization

Scope: Application authorization scope

snsapi_base: Does not pop up the authorization page, jumps directly, and can only obtain the user openid

snsapi_userinfo : The authorization page pops up, and you can get the nickname, gender, and location through openid

State: Parameters after redirection

2. A code will be generated after the user agrees , only valid for minutes.

String code = request.getParameter("code")

3. Code for 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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