SpringBoot项目整合拦截器详解

/**
 * @author gf
 * @date 2023/2/6
 */
@Component
public class Intercepter1 implements HandlerInterceptor {
    @Override
    //在将请求发送到控制器controller之前执行操作，若返回true就进入控制器，若返回false就不进入控制器了
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        String token = request.getHeader("token");
        System.out.println("自定义拦截器1-----拦截到的token值为:"+token);
        return null != token;
    }
 
    @Override
    //用于在将响应发送到客户端之前执行操作,就是控制器执行完之后返回数据时执行。
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, @Nullable ModelAndView modelAndView) throws Exception {
        System.out.println("自定义拦截器1-----控制器执行完毕，返回数据");
    }
 
    @Override
    //在完成请求和响应后执行操作
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, @Nullable Exception ex) throws Exception {
        System.out.println("自定义拦截器1-----响应结束");
    }
 
}

/**
 * @author gf
 * @date 2023/2/6
 */
@Configuration
public class InterceptConfig implements WebMvcConfigurer {
 
 
    //引入自定义拦截器对象
    @Resource
    private Intercepter1 Intercepter1;
 
 
    //重写addInterceptors方法注册拦截器
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
 
        //addPathPatterns方法添加拦截路径匹配规则("/**"是拦截所有)，excludePathPatterns方法是设置白名单，放行哪些路
        registry.addInterceptor(Intercepter1).addPathPatterns("/**").excludePathPatterns("/test/*").order(1);
    }
}

    @GetMapping("/test")
    public BaseResponse<String> sayHello(@RequestParam("name") String name){
        if(!name.equals("老王")){
            throw new BaseException(BaseErrorEnum.USER_NOT_EXIST);
        }
        else{
            return RespGenerator.success("调用成功");
        }
    }