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  • spring mvc

    使用idea 搭建一个spring web 项目,spring boot 也行,反正是温故学习,弄明白就好。

    MVC 配置:

    @Configuration
    @EnableWebMvc
    @ComponentScan("com.duoke.demo")
    public class SpringMvcConfig {
    
    //    配置解析器Bean
        @Bean
        public InternalResourceViewResolver viewResolver(){
            InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();
            viewResolver.setPrefix("WEB-INF/classes/views");
            viewResolver.setSuffix(".html");
    //        viewResolver.setViewClass(JstlView.class);
            return viewResolver;
        }
    }

    对于使用@Controller 注解声明的类,servlet 会自动扫描注解了此注解的类。

    在作为控制器的时候只能使用它。

    @RequestMapping

    映射web请求,路径及参数

    @RequestBody

    响应body,返回一在一个响应内容

    @RequestBody

    请求参数

    @PathVariable

    接收路径参数,类似rest请求的路径参数。

    @RestController

    组合注解(Controller 与 ResponserBody)

    拦截器:配置拦截器CustomInter,在配置中注册拦截器

    @Configuration
    public class MvcConfig implements WebMvcConfigurer {
    
        @Override
        public void addInterceptors(InterceptorRegistry registry) {
            InterceptorRegistration registration = registry.addInterceptor(new CustomInter());
            registration.addPathPatterns("/**");
            registration.excludePathPatterns("/","/login","/error");
        }
    }
        @Override
    //    请求发生前
        public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
            long startTime = System.currentTimeMillis();
            request.setAttribute("start",startTime);
            return super.preHandle(request, response, handler);
        }
    
        @Override
    //    请求发生后
        public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
            long startTime = (long) request.getAttribute("start");
            long endTme = System.currentTimeMillis();
            System.out.println(endTme - startTime);
            request.removeAttribute("start");
            super.postHandle(request, response, handler, modelAndView);
        }

    控制转向(针对重定向的页面使用方便)

    @Override
        public void addViewControllers(ViewControllerRegistry registry) {
            registry.addViewController("/").setViewName("/login");
        }

    EventSource

    SSR (server - sent event)

    http://javascript.ruanyifeng.com/htmlapi/eventsource.html

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  • 原文地址:https://www.cnblogs.com/jony-it/p/11349375.html
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