springboot 整合interceptor

过滤器是java实现的，它需要依赖于Servlet容器，而拦截器是SprignMVC实现的一个机制，独立于Servlet容器，而且能实现IOC容器中的各个bean。简单的说：过滤器的urlPattern针对的是所有的请求，而拦截器的urlPattern针对的SpringMVC中的Controller控制器处理的请求，并不会拦截Servlet容器

一、创建一个自定义拦截器，继承HandlerInterceptor

 

@Component

public class MyInterceptor implements HandlerInterceptor {

    @Override

    public booleanpreHandle(HttpServletRequest request, HttpServletResponse response, Objecthandler) {

       System.out.println("preHandle"+request.getRequestURL().toString());

        return true; //返回false结束当前请求，返回true继续向下执行

   }

 

    @Override

    public voidpostHandle(HttpServletRequest request, HttpServletResponse response, Objecthandler, ModelAndView modelAndView) {

       System.out.println("postHandle");

 

    }

 

    @Override

    public voidafterCompletion(HttpServletRequest request, HttpServletResponse response,Object handler, Exception ex) {

       System.out.println("afterCompletion");

    }

}

二、创建一个配置类，继承WebMvcConfigurer，重写addInterceptors 添加配置拦截器和拦截url

@Configuration

public class MyWebMvnAdapter implements WebMvcConfigurer {//WebMvcConfigurerAdapter已经过时

 

    @Autowired

    private MyInterceptormyInterceptor;

 

    @Override

    public voidaddInterceptors(InterceptorRegistry registry) {

        registry.addInterceptor(myInterceptor).addPathPatterns("/hello").addPathPatterns("/**");

    }

}

 

三、写一个controller

@RestController

@RequestMapping("hello")

public class HelloController {

 

    @RequestMapping(value ="world1",method = RequestMethod.GET)

    public String helloWorld1(){

        return"world1";

    }

 

    @RequestMapping(value ="world2",method = RequestMethod.POST)

    public String helloWorld2(){

        return"world2";

    }

}