您可以使用Spring Security的JwtDecoder来解码JWT令牌并创建一个`JwtAuthenticationToken示例。
下面是一个例子：

import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
    import org.springframework.security.core.Authentication;
    import org.springframework.security.core.authority.SimpleGrantedAuthority;
    import org.springframework.security.oauth2.jwt.Jwt;
    import org.springframework.security.oauth2.jwt.JwtDecoder;
    import org.springframework.security.oauth2.jwt.JwtException;
    import org.springframework.security.oauth2.jwt.JwtValidationException;
    import org.springframework.security.oauth2.jwt.NimbusJwtDecoder;
    
    import java.util.Collections;
    
    public class JwtUtils {
    
        public static Authentication getAuthenticationFromJwtToken(String jwtToken) throws JwtException {
            JwtDecoder jwtDecoder = new NimbusJwtDecoder(); 
            Jwt jwt = jwtDecoder.decode(jwtToken);

            String username = jwt.getSubject();
            String[] authorities = jwt.getClaimAsStringArray("authorities");

            return new UsernamePasswordAuthenticationToken(
                    username,
                    null,
                    Collections.singletonList(new SimpleGrantedAuthority(authorities[0]))
            );
        }
    }

这里有一些你应该阅读的资源：

• https://docs.spring.io/spring-security/site/docs/current/api/org/springframework/security/oauth2/jwt/JwtDecoder.html
• https://docs.spring.io/spring-security/site/docs/current/api/org/springframework/security/oauth2/server/resource/authentication/JwtAuthenticationToken.html