项目整体搭建基于以下文章：

ssm框架整合(配置文件方式 和 纯注解方式) - 简书 (jianshu.com)

无论那种方式，都需要创建一个自定义拦截器类

package com.xx.ssm.interceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

public class IndexInterceptor implements HandlerInterceptor{
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("该方法在 controller 执行前执行，可以实现对数据的预处理。 如果方法返回 true ，则继续调用下一个资源。否则不在继续调用。");
        return false;//为false是拦截，true是放行
    }
    
    
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,ModelAndView modelAndView) throws Exception {
        System.out.println("该方法在处理器执行后，生成视图前执行。这里有机会修改视图层数据");
    }
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)throws Exception {
        System.out.println("最后执行，通常用于记录日志，释放资源，处理异常。");
    }
}

一、配置文件方式

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
                        http://www.springframework.org/schema/beans/spring-beans.xsd
                        http://www.springframework.org/schema/context
                        http://www.springframework.org/schema/context/spring-context.xsd
                        http://www.springframework.org/schema/aop
                        http://www.springframework.org/schema/aop/spring-aop.xsd
                        http://www.springframework.org/schema/mvc
                        http://www.springframework.org/schema/mvc/spring-mvc.xsd">
     <!--  自动加载注解的处理器映射和注解的处理器适配  -->   
    <mvc:annotation-driven />
    <!-- 开启注解扫描，将包下带有@Controller注解的类纳入Spring容器中-->
    <context:component-scan base-package="com.xx.ssm.controller" />
 

    <!-- 可以配置多个拦截器 -->
    <mvc:interceptors>
        <mvc:interceptor>
            <mvc:mapping path="/**" /><!-- 拦截所有路径及其子路径-->
            <mvc:exclude-mapping path="/login" /><!-- 放行的路径-->
            <bean class="com.xx.ssm.interceptor.IndexInterceptor" /> <!-- 注册自定义拦截器类-->
        </mvc:interceptor>
    </mvc:interceptors>
   
</beans> 

二、纯注解方式

修改WebConfig类

package com.neusoft.ssm;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

import com.xx.ssm.interceptor.IndexInterceptor;

@Configuration
@EnableWebMvc // SpringMVC注解，等同于<mvc:annotation-driven/>
@ComponentScan(basePackages = { "com.neusoft.ssm.controller" }) // @ComponentScan用于扫描通用组件，这里用来扫描Controller组件
public class WebConfig implements WebMvcConfigurer { //实现WebMvcConfigurer接口
    
    @Bean   //将自定义拦截器放入到spring容器中
    public IndexInterceptor interceptor() {
        return new IndexInterceptor();
    }
    
    @Autowired  //创建自定义的拦截器
    IndexInterceptor interceptor;

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
 
        registry.addInterceptor(interceptor) // 添加拦截器
                .addPathPatterns("/**")       // 添加需要拦截的路径
                .excludePathPatterns("/login");        // 放行的路径
    } 
}