微信公众号支付（一）如何获取用户openId

　　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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