项目参考：详细参见：《Spring Boot 2精髓：从构建小系统到架构分布式大系统》 第三章 3.6.1节 拦截器

 

 

MyWebMvcConfigurer

package com.archibladwitwicke.springboot2.chapter03.configurer;import com.archibladwitwicke.springboot2.chapter03.intercept.AdminLoginIntercept;import org.springframework.context.annotation.Configuration;import org.springframework.web.servlet.config.annotation.InterceptorRegistry;import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;@Configurationpublic class MyWebMvcConfigurer implements WebMvcConfigurer {    @Override    public void addInterceptors(InterceptorRegistry registry) {        // 添加一个拦截器，连接以/admin为前缀的 url路径        registry.addInterceptor(new AdminLoginIntercept()).addPathPatterns("/admin/**");    }}

　　

TestAdminController

package com.archibladwitwicke.springboot2.chapter03.controller;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.ResponseBody;@Controller@RequestMapping("/admin")public class TestAdminController {    @RequestMapping("/hello")    @ResponseBody    public String say() {        return "this is a admin page.";    }}

　　

AdminLoginIntecept

package com.archibladwitwicke.springboot2.chapter03.intercept;import org.springframework.web.servlet.HandlerInterceptor;import org.springframework.web.servlet.ModelAndView;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class AdminLoginIntercept implements HandlerInterceptor {    @Override    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {        // 如果已经登录返回true。        // 如果没有登录没有登录，可以使用 reponse.send() 跳转页面。后面要跟return false,否则无法结束;        // 为了测试，打印一句话        System.out.println("访问了admin下url路径。");        return true;    }    @Override    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {    }    @Override    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {    }}