拦截器以及快速接管SpringMVC

定义一个配置类

@Configuration
public class MySpringMVC implements WebMvcConfigurer {

    @Autowired
    private MyInterceptor myInterceptor;
    
    /**
     * 视图映射
     * @param registry
     */
    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("/").setViewName("login");
        registry.addViewController("/login").setViewName("login");
        registry.addViewController("/helloword").setViewName("login");
    }

    /**
     * 注册拦截器，也就是使自己的拦截器生效
     * @param registry
     */
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(myInterceptor).addPathPatterns("/test_interceptor");
    }
}

定义拦截器，并加上@Component注解注入ioc容器

    /**
     * 定义自己的拦截器
     */
@Component
public class MyInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response,      Object handler) throws Exception {
        //通过request.getParameter("name");获取控制方法的参数值
        String name = request.getParameter("name");
        //拿到值后做判断
        if (name.equals("chen")){
            //放行
            return true;
        }
        //拦截
        return false;
    }
}

这里展示一下控制方法

@RestController
public class Controller {
    @GetMapping("/*****")
    public String test_interceptor(@RequestParam("name") String name){}
}