其然乐衣

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@Configuration
public class RequestInterceptor  implements WebMvcConfigurer {

    @Autowired
    private RedisTemplate redisTemplate;

    private List<String> patterns = new ArrayList<String>();  //不用过滤的url

    public void addInterceptor(InterceptorRegistry registry){

        //写一个拦截器
        registry.addInterceptor(new HandlerInterceptor() {
            @Override
            public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {


                //从请求头中获取token
                String token = request.getHeader("Authorization");
//                                      从redis中获取token
                if(token != null && redisTemplate.opsForValue().get(token) != null){
                    //每次认证后就充值为30天                      时间单位：天
                    redisTemplate.expire(token,30, TimeUnit.DAYS);
                    return true;   //取到就返回true
                }

                //设置响应状态为401
                response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);

                return false;
            }
        }).excludePathPatterns(patterns);  //不用过滤的url

    }
}