在SpringBoot中添加拦截器

首先新建config包下的MvcConfig类

@Configuration//配置类 spring-xxx.xml
public class MvcConfig implements WebMvcConfigurer {


    //<bean></bean>
    @Bean
    public LoginInterceptor loginInterceptor(){
        return new LoginInterceptor();
    }

    // 添加拦截器
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(loginInterceptor()).addPathPatterns("/*");
    }
}

           

controller层新建一个跳转方法用于拦截

@RestController 
public class HelloController {
    
    @GetMapping("say")
    public String say(){
        System.out.println("say");
        return "hello";
    }
}
           

新建interceptor包下的LoginInterceptor

//拦截器
public class LoginInterceptor implements HandlerInterceptor {

    //方法之前拦截
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("preHandle");
        return true;
    }

    //返回视图之前
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

        System.out.println("postHandle");
    }

    //返回视图之后
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

        System.out.println("afterCompletion");
    }
}
           

最终结果，依次打印

如果prehandler返回的是false

say方法会被拦截，并不会打印