第三方网站---站内扫码绑定微信---登录页扫码登录（附代码）
参考博客
https://www.cnblogs.com/0201zcr/p/5133062.html
官方文档
https://open.weixin.qq.com/cgi-bin/showdocument? action=dir_list&t=resource/res_list&verify=1&id=open1419316505&token=&lang=zh_CN
SpringBoot整合HttpClient
https://blog.csdn.net/wsywb111/article/details/80311716
主要代码：
1.获取二维码
//获取二维码的链接
public class Get2WeiCode {// 请求微信相关参数//站内绑定微信 的 回调static String bindCallBack = "";登陆页微信登陆 的 回调static String loginCallBack = "";static String appid = "";static String scope = "snsapi_login";//获取二维码-----------state里放userid ，用于网站内部，重新登陆public static String get2WeiCodeWithUserid(RegUser user) throws UnsupportedEncodingException {// 生成6位随机数String random = String.valueOf(new Random().nextInt(899999) + 100000);Integer userId = user.getId();// state 随机数 + useridString state = random + userId;// 配置二维码链接--要更改appid 和 redirect_uriString oauthUrl = "https://open.weixin.qq.com/connect/qrconnect?appid=APPID&redirect_uri=REDIRECT_URI&response_type=code&scope=snsapi_login&state=STATE#wechat_redirect";String redirect_uri = URLEncoder.encode(bindCallBack, "utf-8");oauthUrl = oauthUrl.replace("APPID", appid).replace("REDIRECT_URI", redirect_uri).replace("SCOPE", scope).replace("STATE", state);return oauthUrl;}//获取二维码-----------state里 不放userid ，用于登陆页面public static String get2WeiCodeWithoutUserid() throws UnsupportedEncodingException {// 配置二维码链接--要更改appid 和 redirect_uriString oauthUrl = "https://open.weixin.qq.com/connect/qrconnect?appid=APPID&redirect_uri=REDIRECT_URI&response_type=code&scope=snsapi_login&state=STATE#wechat_redirect";String redirect_uri = URLEncoder.encode(loginCallBack, "utf-8");oauthUrl = oauthUrl.replace("APPID", appid).replace("REDIRECT_URI", redirect_uri).replace("SCOPE", scope);return oauthUrl;}}2.回调函数
static String appid = "";static String appSecret = "";// 授权后回调方法--站内@RequestMapping("/callBack")public String callBack(HttpSession session, String code, String state, Model model) throws Exception {// 获取当前登陆用户idString userId = state.substring(6);Integer userId2 = Integer.valueOf(userId);RegUser user = regUserService.findUserById(userId2);String registerNo = user.getRegisterNo();String phone = user.getPhone();// 1. 获取扫码者微信信息WechatInfo wechatInfo = wechatInfoService.getWechatInfo(code, state, appid, appSecret);// 2.通过openid查微信表是否有记录WechatInfo record = wechatInfoService.findWechatInfoByOpenid(wechatInfo.getOpenid());// 3. 通过userId查微信表是否有记录WechatInfo record2 = wechatInfoService.findWechatInfoByBindUserid(userId);//registerNo,phone用于登录，相当于用户名密码session.setAttribute("registerNo", registerNo);session.setAttribute("phone", phone);if(record == null) {if(record2 == null) {//无记录，未绑定 ，添加微信信息到微信表,绑定后进首页-wechatInfo.setBinduserid(userId); wechatInfoService.addWechat(wechatInfo);session.setAttribute("bindStatus", "Success");return "/netbar/wechat-skip1";}else {//该帐号被其他微信绑定过session.setAttribute("bindStatus", "OtherWechatBind");return "/netbar/wechat-skip1";}}else {if(record2 == null) {//该微信绑定过其他帐号session.setAttribute("bindStatus", "BindOtherAccount");return "/netbar/wechat-skip1";}else {//该微信已绑定当前帐号session.setAttribute("bindStatus", "IsBinding");return "/netbar/wechat-skip1";}}}// 授权后回调方法--登陆页面二维码@SuppressWarnings("unused")@RequestMapping("/callBack/forLogin")public String callBackForLogin(HttpSession session, String code, String state, Model model) throws Exception {// 1. 获取扫码者微信信息WechatInfo wechatInfo = wechatInfoService.getWechatInfo(code, null, appid, appSecret);// 2.通过openid查微信表是否有记录WechatInfo record = wechatInfoService.findWechatInfoByOpenid(wechatInfo.getOpenid());if (record == null) {// 提示当前微信未绑定过帐户，无法登陆。跳转到登陆页面System.out.println("微信没绑定过");// session里放个标记,用来在登陆页面提示该微信未绑定微信,不能登陆session.setAttribute("isBind", "no");return "redirect:/reglogin";} else {System.out.println("微信可以登陆");String binduserid = record.getBinduserid();Integer userId = Integer.valueOf(binduserid);// 查出该微信绑定的用户的用户信息RegUser user = regUserService.findUserById(userId);String registerNo = user.getRegisterNo();String phone = user.getPhone();return "redirect:/regdologin3?registerNo=" + registerNo + "&phone=" + phone;}}3. 获取扫码者微信信息
// 此方法只调微信接口，返回扫码者微信信息。不接通本项目数据库。@Overridepublic WechatInfo getWechatInfo(String code, String state, String appid, String appSecret) throws Exception {WechatInfo info = new WechatInfo();// 1.通过code获取access_tokenString url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=APPID&secret=SECRET&code=CODE&grant_type=authorization_code";url = url.replace("APPID", appid).replace("SECRET", appSecret).replace("CODE", code);String getAccessToken = httpAPIService.doGet(url);JSONObject jsonObject = JSON.parseObject(getAccessToken);String access_token = jsonObject.getString("access_token");String openid = jsonObject.getString("openid");// 2.通过access_token和openid获取用户信息String userInfoUrl = "https://api.weixin.qq.com/sns/userinfo?access_token=ACCESS_TOKEN&openid=OPENID";userInfoUrl = userInfoUrl.replace("ACCESS_TOKEN", access_token).replace("OPENID", openid);String getUserInfo = httpAPIService.doGet(userInfoUrl);JSONObject jsonObject2 = JSON.parseObject(getUserInfo);String nickname = jsonObject2.getString("nickname");String sex = jsonObject2.getString("sex");String province = jsonObject2.getString("province");String city = jsonObject2.getString("city");String headimgurl = jsonObject2.getString("headimgurl");String unionid = jsonObject2.getString("unionid");info.setNickname(nickname);info.setSex(sex);info.setProvince(province);info.setCity(city);info.setHeadimgurl(headimgurl);info.setOpenid(openid);info.setUnionid(unionid);return info;}4. 跳转的中间页示例。
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5.微信表
SET FOREIGN_KEY_CHECKS=0;DROP TABLE IF EXISTS `wechat_info`;CREATE TABLE `wechat_info` (`id` int(20) NOT NULL AUTO_INCREMENT,`openid` varchar(100) NOT NULL,`nickname` varchar(50) DEFAULT NULL,`password` varchar(20) DEFAULT NULL,`sex` varchar(50) DEFAULT NULL,`province` varchar(50) DEFAULT NULL,`city` varchar(50) DEFAULT NULL,`headimgurl` varchar(300) DEFAULT NULL,`privilege` varchar(300) DEFAULT NULL,`unionid` varchar(300) DEFAULT NULL,`bindUserid` varchar(20) NOT NULL,`preSet1` varchar(50) DEFAULT NULL,PRIMARY KEY (`id`) USING BTREE,UNIQUE KEY `openid` (`openid`),UNIQUE KEY `bindUserid` (`bindUserid`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='微信信息表';6. 页面接收二维码链接
遇到的问题：
1.用户名密码登录后，站内绑定微信，微信回调后，登录的认证信息失效。解决方式（偷偷的再次登录）：回调地址里的state里包含上userid（微信回调时会把state原样带回来），通过userid获取用户名密码，带上参数，重定向到登录的controller。如：
return "redirect:/ login?username="+username+"&password="+password;
认证通过后重定向到首页 return "redirect:/ index";
感觉这种方式有点二，如果你有更好的办法，欢迎指教。
待续。。。。
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