首先，你的项目要能跑起来，且基于springboot的

boot的拦截器不用配置web.xml，按照特定名字书写(后缀+注解)，它会自动识别(位置随便放，只要在代码目录下就可以)

1.拦截器 SessionInterceptor.java

package com.hfanss.blog.utils;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.HandlerInterceptor;

import org.springframework.web.servlet.ModelAndView;

/**

* 功能描述:拦截器实现类

* @author: hfanss

* @date: 2019年6月25日 下午9:23:32

*/

public class SessionInterceptor implements HandlerInterceptor

{

@Override

public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception

{

System.err.println("拦截器进来了,路径为："+request.getRequestURI());

if (request.getRequestURI().equals("/admin/**"))

{

//TODO 验证登录token

return true;

}else {

return true;

}

}

@Override

public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception

{

// TODO Auto-generated method stub

}

@Override

public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception

{

// TODO Auto-generated method stub

}

}

2.路径 SessionConfiguration.java

package com.hfanss.blog.utils;

import java.util.List;

import org.springframework.context.annotation.Configuration;

import org.springframework.format.FormatterRegistry;

import org.springframework.http.converter.HttpMessageConverter;

import org.springframework.validation.MessageCodesResolver;

import org.springframework.validation.Validator;

import org.springframework.web.method.support.HandlerMethodArgumentResolver;

import org.springframework.web.method.support.HandlerMethodReturnValueHandler;

import org.springframework.web.servlet.HandlerExceptionResolver;

import org.springframework.web.servlet.config.annotation.AsyncSupportConfigurer;

import org.springframework.web.servlet.config.annotation.ContentNegotiationConfigurer;

import org.springframework.web.servlet.config.annotation.CorsRegistry;

import org.springframework.web.servlet.config.annotation.DefaultServletHandlerConfigurer;

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.ViewControllerRegistry;

import org.springframework.web.servlet.config.annotation.ViewResolverRegistry;

import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

/**

* 功能描述:配置拦截器路径 /admin/

* @author: hfanss

* @date: 2019年6月25日 下午9:37:21

*/

@Configuration

public class SessionConfiguration implements WebMvcConfigurer

{

@Override

public void addInterceptors(InterceptorRegistry registry)

{

registry.addInterceptor(new SessionInterceptor()).addPathPatterns("/admin/**");

}

.....

}

运行项目，拦截器实现类方法内打个断点，会发现所有带 admin的路径都会被拦截到

可以根据需要定义拦截的路径，拦截器常用的功能也就用户登录控制