java之拦截器Interceptor/自定义视图解析器

拦截器，return true 是放行

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package com.jay.interceptors; import org.springframework.web.servlet.HandlerInterceptor; import org.springframework.web.servlet.ModelAndView; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession;   public class LoginInterceptor implements HandlerInterceptor {     @Override     public boolean preHandle(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, Object handler) throws Exception {         //拦截前         String url = request.getRequestURL().toString();         if (url.contains("login")) {             return true;         }         HttpSession session = request.getSession();         String name = (String) session.getAttribute("username");         System.out.println(name);         if (name != null) {             return true;         } else {             request.getRequestDispatcher("/login").forward(request, response);         }         return false;     }     @Override     public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {         //拦截后     }       @Override     public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {         //清理前     } }

在Spring xml中配置拦截器 /** 是拦截所有请求

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<!--拦截器-->     <mvc:interceptors>         <mvc:interceptor>             <mvc:mapping path="/**"/>             <bean class="com.jay.interceptors.LoginInterceptor"/>         </mvc:interceptor>     </mvc:interceptors>

 在SpringBoot中配置拦截器，在自定义解析器中

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@Override     public void addInterceptors(InterceptorRegistry registry) {         registry.addInterceptor(new LoginInterceptor()).addPathPatterns("/**")                 .excludePathPatterns("/index","/login","/css/**","/js/**","/img/**");     }

 视图解析器

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package com.jay.SpringBootStudy8.config;   import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.web.servlet.LocaleResolver; import org.springframework.web.servlet.config.annotation.InterceptorRegistry; import org.springframework.web.servlet.config.annotation.ViewControllerRegistry; import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;   @Configuration public class MyMvcConfig implements WebMvcConfigurer {     @Override     public void addViewControllers(ViewControllerRegistry registry) {         //设置视图请求地址，相当于 @RequestMapping("/a") //        registry.addViewController("/a").setViewName("views/sysuser/index"); //        registry.addViewController("/index.html").setViewName("index");     }     @Bean     public LocaleResolver localeResolver(){         return new MyLocaleResolver();     }       @Override     public void addInterceptors(InterceptorRegistry registry) { //        registry.addInterceptor(new LoginInterceptor()).addPathPatterns("/**") //                .excludePathPatterns("/index","/login","/css/**","/js/**","/img/**");     } }