h5访问地址是一个接口。就是 http://xxx/wx/mpauth

    private String mpAppid="公众号的appid";
    private String mpAppsecret="公众号的appid";
    private String mpRedirecturl="http://xxx/wx/mphandle";

/**
     * 1.微信公众号跳转授权
     */
    @RequestMapping("/wx/mpauth")
    public void toWxMpAuth(HttpServletResponse response) throws IOException {
        String url = "https://open.weixin.qq.com/connect/oauth2/authorize?appid=APPID&redirect_uri=REDIRECT_URI&response_type=code&scope=snsapi_userinfo&state=0#wechat_redirect";
        url = url.replace("APPID",mpAppid);
        url = url.replace("REDIRECT_URI",mpRedirecturl);
        response.sendRedirect(url);
    }

    /**
     * 2.公众号授权处理
     * @param code
     * @throws IOException
     */
    @RequestMapping("/wx/mphandle")
    public void mpHandle(HttpServletResponse response,String code) throws IOException {
        JSONObject jsonObject = WxUtil.getOpenidByCode(mpAppid,mpAppsecret,code);
        String openid = jsonObject.getString("openid");
        String accessToken = jsonObject.getString("access_token");
        lsUserService.operateMpLogin(response,openid,accessToken);
    }

import com.lanshi.framework.jwt.JWTUtil;
import com.alibaba.fastjson.JSONObject;
/**
     * 3.处理公众号授权登录
     * @param response
     * @param openid
     * @param accessToken
     */
    public void operateMpLogin(HttpServletResponse response, String openid, String accessToken) throws IOException {
        JSONObject jsonObject = WxUtil.getUserInfoByOpenidAndAccessToken(openid,accessToken);
        if(jsonObject==null){
            response.sendRedirect(mpRedirecturl+"loginMobile.html"+"?errorMsg=获取token错误");
        }
        String unionid = jsonObject.getString("unionid");
        String nickname = jsonObject.getString("nickname");
        String headimgurl = jsonObject.getString("headimgurl");
        String[] arr = unionid.split("_");
        LsUser lsUser = lsUserDao.getUserByUnionid(arr[0]);
        //以下为业务逻辑，根据需求修改
        if(lsUser==null){
            response.sendRedirect(mpRedirectHtml+"公众号网页名称1.html"+"?unionid="+unionid+"_"+openid);
        }else{
            if(lsUser.getStatus().intValue()!=10){
                response.sendRedirect(mpRedirectHtml+"公众号网页名称1.html"+"?errorMsg=当前用户已经被禁用");
                return;
            }
            lsUser.setMpOpenid(openid);
            lsUser.setNickname(nickname);
            lsUser.setHeadimg(headimgurl);
            lsUserDao.updateById(lsUser);
            response.sendRedirect(mpRedirectHtml+"公众号网页名称2.html"+"?userinfo="+JWTUtil.sign(lsUser.getId().toString()));
        }
    }