建包interceptors，建类LoginInterceptor

import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import walker.utils.JwtUtil;

import java.util.Map;

@Component
public class LoginInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        // 令牌验证
        String token = request.getHeader("Authorization");
        try {
            Map<String, Object> claims = JwtUtil.parseToken(token);
            // 放行
            return true;
        }catch (Exception e){
            // http响应状态码为401
            response.setStatus(401);
            // 不放行
            return false;
        }
    }
}

建包config，建类WebConfig

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import walker.interceptors.LoginInterceptor;

@Configuration
public class WebConfig implements WebMvcConfigurer {

    @Autowired
    private LoginInterceptor loginInterceptor;

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        // 登录、注册不拦截
        registry.addInterceptor(loginInterceptor).excludePathPatterns("/user/login", "/user/register");
    }
}