springboot拦截器的详细实现

1. 首先实现HandlerInterceptor接口写一个拦截器

public class MyInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("被拦截了===================");
        return true;//返回true放行，false反之
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

    }
}

2. 实现WebMvcConfigurer 接口的addInterceptors方法配置拦截器使其生效

@Configuration
public class InterceptorConfig implements WebMvcConfigurer {
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new MyInterceptor()).
                addPathPatterns("/ljq/**").//添加拦截器的地址
                excludePathPatterns("/login");//添加不被拦截器的地址
    }
}

3. 这样拦截器就配置好了，我们进行测试下

@Controller
@RequestMapping("/ljq")
public class InterceptorController {

    @RequestMapping("/testInterceptor")
    @ResponseBody
    public String testInterceptor(){
        return "拦截器";
    }
}

请求地址

测试结果