实现登录拦截器

src/main/java/com/fjy/spring/interceptor/LoginInterceptor.java

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+package com.fjy.spring.interceptor;
+
+import com.fjy.spring.constant.GlobalConstant;
+import org.springframework.web.servlet.HandlerInterceptor;
+import org.springframework.web.servlet.ModelAndView;
+
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+public class LoginInterceptor implements HandlerInterceptor {
+    @Override
+    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
+        System.out.println("preHandle");
+        Object user = request.getSession().getAttribute(GlobalConstant.USER_SESSION_KEY);
+        if (user==null){
+            response.sendRedirect("/cms/index");
+            return false;
+        }
+        return true;
+    }
+
+    @Override
+    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
+        System.out.println("postHandle");
+    }
+
+    @Override
+    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
+        System.out.println("afterCompletion");
+    }
+}

src/main/java/com/fjy/spring/interceptor/WebAppConfig.java

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+package com.fjy.spring.interceptor;
+
+import org.springframework.context.annotation.Configuration;
+import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
+import org.springframework.web.servlet.config.annotation.PathMatchConfigurer;
+import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
+
+@Configuration
+public class WebAppConfig implements WebMvcConfigurer {
+
+    /**
+     * 注册拦截器
+     * @param registry
+     */
+    @Override
+    public void addInterceptors(InterceptorRegistry registry) {
+        registry.addInterceptor(new LoginInterceptor()).addPathPatterns("/home/**");
+    }
+
+    /**
+     * 排除静态资源
+     * @param registry
+     */
+    @Override
+    public void addResourceHandlers(ResourceHandlerRegistry registry) {
+        registry.addResourceHandler("/cms/js/**").addResourceLocations("classpath:/js/");
+        registry.addResourceHandler("/cms/css/**").addResourceLocations("classpath:/css/");
+        registry.addResourceHandler("/css/**").addResourceLocations("classpath:/css/");
+        registry.addResourceHandler("/cms/fonts/**").addResourceLocations("classpath:/fonts/");
+        registry.addResourceHandler("/cms/images/**").addResourceLocations("classpath:/images/");
+    }
+}