微信网页授权提示 errcode:40029 errmsg:invalid code
测试发现是因为不明原因请求两次导致code失效（code只能使用一次）
解决方法：
在返回页面加try catch解决，具体原因稍后待查。
try {
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
//网站id
String websiteId = request.getParameter("websiteId");
// 用户同意授权后，能获取到code
String code = request.getParameter("code");
// 用户同意授权
if (!"authdeny".equals(code)) {
// 获取网页授权access_token
WeixinOauth2Token weixinOauth2Token = AdvancedUtil.getOauth2AccessToken("XXXXXXXXXXXXXXXXXX", "XXXXXXXXXXXXXXXXXX", code);
// 网页授权接口访问凭证
String accessToken = weixinOauth2Token.getAccessToken();
// 用户标识
String openId = weixinOauth2Token.getOpenId();
// 获取用户信息
SNSUserInfo snsUserInfo = AdvancedUtil.getSNSUserInfo(accessToken, openId);
String nickName = CommonString.getFormatPara(snsUserInfo.getNickname());
// 设置要传递的参数
request.setAttribute("snsUserInfo", snsUserInfo);
request.setAttribute("websiteId", websiteId);
}
//跳转到index.jsp
request.getRequestDispatcher("/index.jsp").forward(request, response);
return;
} catch (Exception e) {
e.printStackTrace();
}