oauth2 出现 cannot be cast to .security.oauth2.provider.authentication.OAuth2AuthenticationDetails

一、问题背景

在使用oauth2获取用户登录信息的时候,如果用户未登录,就会出现 org.springframework.security.web.authentication.WebAuthenticationDetails cannot be cast to org.springframework.security.oauth2.provider.authentication.OAuth2AuthenticationDetails;

问题如下:

二、原因

问题出现在以下两句代码：

 Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
OAuth2AuthenticationDetails details = (OAuth2AuthenticationDetails) authentication.getDetails();

通过打印 authentication 对象的authentication.getAuthorities()
和authentication.getName()属性我们可以发现：当用户未登录的时候,这两个属性的值分别为：[ROLE_ANONYMOUS] 、anonymousUser，因此OAuth2AuthenticationDetails在将authentication.getDetails() 转型时出现无法转型的错误,知道为题所在以后我们就可以对症下药了。

三、解决办法

在调用 SysUser user = AuthUtil.getUserInfo();方法获取用户登录信息之前,我们想要判断用户是否登录,判断方法如下:

public class UserLoginCheck {
    public static boolean userIsLogin() {
    Authentication authentication = SecurityContextHolder.getContext().getAuthentication();String userName = authentication.getName();String role = authentication.getAuthorities().toString();if ("anonymousUser".toUpperCase(Locale.ROOT).equals(userName.toUpperCase(Locale.ROOT))) {
    return false;}return !"[ROLE_ANONYMOUS]".equals(role);}
}

如果该方法返回false,则说明用户未登录,所以不要调用 SysUser user = AuthUtil.getUserInfo();方法,直接给出提示即可;通过以上方法可以有效避免本文所遇见的问题。
PS：完整的AuthUtil.java如下:

import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.oauth2.provider.authentication.OAuth2AuthenticationDetails;import java.util.Map;/** * 自定义内容转化器获取用户额外信息 * * @Author WXZ * @Time 11:07 * @Date 2021.04.04 */
public class AuthUtil {
    /*** 获取用户信息** @return SYSUser*/public static SysUser getUserInfo() {
    Authentication authentication = SecurityContextHolder.getContext().getAuthentication();OAuth2AuthenticationDetails details = (OAuth2AuthenticationDetails) authentication.getDetails();Map<String, Object> map = (Map<String, Object>) details.getDecodedDetails();Map<String, String> userInfo = (Map<String, String>) map.get("userInfo");SysUser user = new SysUser();user.setId(userInfo.get("uid"));user.setUsername(userInfo.get("username"));user.setEmail(userInfo.get("email"));user.setNickName(userInfo.get("nickName"));user.setImageUrl(userInfo.get("imageUrl"));user.setMobile(userInfo.get("mobile"));return user;}
}