首先，你的項目要能跑起來，且基于springboot的

boot的攔截器不用配置web.xml，按照特定名字書寫(后綴+注解)，它會自動識別(位置隨便放，只要在代碼目錄下就可以)

1.攔截器 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:攔截器實現(xiàn)類

* @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("攔截器進來了,路徑為："+request.getRequestURI());

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

{

//TODO 驗證登錄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.路徑 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:配置攔截器路徑 /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/**");

}

.....

}

運行項目，攔截器實現(xiàn)類方法內(nèi)打個斷點，會發(fā)現(xiàn)所有帶 admin的路徑都會被攔截到

可以根據(jù)需要定義攔截的路徑，攔截器常用的功能也就用戶登錄控制

總結(jié)

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