Spring+SpringMVC+MP登录案例（含拦截器）

技术框架

后端：Spring、Spring MVC、Mybatis-Plus

前端：HTML、CSS、Layui、JS、Jquery

功能模块技术

1、用户的每一个请求使用了SpringMVC 拦截器技术，没有登录的用户自动重定向到登录页

2、统一请求模式，使用Restful风格对后端发起请求

3、使用druid数据库连接池技术，进行对数据库连接资源进行管理

4、对已登录的用户使用session进行存储用户信息，登录拦截器拦截的规则就是判断session里有无对应的用户信息来进行拦截

数据库结构

用户表（tb_user）

订单表（tb_orders）

项目文件结构

项目效果

登录页

首页（展示当前登录用户的订单信息）

项目核心文件

Tomcat服务器配置文件（web.xml）

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
  <display-name>Archetype Created Web Application</display-name>

  <!-- Tomcat容器上下文配置参数-->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:spring.xml</param-value>
  </context-param>
  <!-- 注册SpringMVC提供的过滤器，解决乱码问题-->
  <filter>
    <filter-name>CharacterEncodingFilter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
      <param-name>encoding</param-name>
      <param-value>UTF-8</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>CharacterEncodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

  <!-- 加载SpringMVC容器 -->
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>



  <!-- 注册前端控制器-->
  <servlet>
    <servlet-name>DispatcherServlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:springmvc.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>DispatcherServlet</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>


  <welcome-file-list>
    <welcome-file>/page/login.html</welcome-file>
  </welcome-file-list>
</web-app>

spring.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:context="http://www.springframework.org/schema/context"
       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">
    <!-- 包扫描  -->
    <context:component-scan base-package="com"></context:component-scan>
    <import resource="springdao.xml"></import>
</beans>

springmvc.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
    <!-- 配置Controller扫描 -->
    <context:component-scan base-package="com.controller" />

    <!-- 配置注解驱动 -->
    <mvc:annotation-driven />

    <!-- 配置静态资源映射 -->
    <mvc:resources location="/static/css/" mapping="/css/**" />
    <mvc:resources location="/static/js/" mapping="/js/**" />
    <mvc:resources location="/static/layui/" mapping="/layui/**" />
    <mvc:resources location="/static/layer/" mapping="/layer/**" />

    <!-- Servlet默认处理器-->
    <mvc:default-servlet-handler></mvc:default-servlet-handler>
    <bean id="stringHttpMessageConverter" class="org.springframework.http.converter.StringHttpMessageConverter"/>
    <!-- 配置拦截器 -->
    <mvc:interceptors>
        <mvc:interceptor>
            <mvc:mapping path="/**" />
            <!-- 配置不拦截请求的地址 -->
            <mvc:exclude-mapping path="/page/login.html" />
            <mvc:exclude-mapping path="/css/**" />
            <mvc:exclude-mapping path="/" />
            <mvc:exclude-mapping path="/js/**" />
            <mvc:exclude-mapping path="/layui/**" />
            <mvc:exclude-mapping path="/layer/**" />
            <mvc:exclude-mapping path="/login" />
            <bean class="com.inteceptor.LoginInterceptor" />
        </mvc:interceptor>
    </mvc:interceptors>

</beans>

springdao.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:context="http://www.springframework.org/schema/context"
       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">
    <!-- 加载数据库配置文件  -->
    <context:property-placeholder location="classpath:db.properties"></context:property-placeholder>
    <!-- 创建Druid数据库连接池-->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="${db.driver}"></property>
        <property name="url" value="${db.url}"></property>
        <property name="username" value="${db.username}"></property>
        <property name="password" value="${db.password}"></property>
    </bean>

    <!-- 创建sqlsessionFactory的Bean 工厂 -->
    <!-- 这里使用的是 mybatis-plus 创建的MybatisSqlSessionFactoryBean-->
    <bean id="sqlSessionFactory" class="com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean">
        <!-- 设置数据源 -->
        <property name="dataSource" ref="dataSource"></property>
        <!--设置mybaits的配置文件  这里有两用设置方法 这里是方法一 使用mybatis.xml 的配置文件设置 -->
        <property name="configLocation" value="classpath:mybatis.xml"></property>
    </bean>
    <!--mapper scan-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
        <property name="basePackage" value="com.mapper"></property>
    </bean>

</beans>

mybatis.xml文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <settings>
        <setting name="logImpl" value="stdout_logging" />
        <setting name="mapUnderscoreToCamelCase" value="true"/>
    </settings>

</configuration>

db.properties文件（这里的数据库配置信息需要改成你自己的，比如密码和驱动）

db.driver=com.mysql.cj.jdbc.Driver
db.url=jdbc:mysql://localhost:3306/db1?characterEncoding=utf-8&allowMultiQueries=true
db.username=root
db.password=123456

登录拦截器（LoginInterceptor）

package com.inteceptor;

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 {
        //获取Session
        Object user = request.getSession().getAttribute("user");
        System.out.println("执行拦截器");
        System.out.println(user);
        //检查用户是否登录
        if (user != null){
            //用户已经登录就直接放行
            return true;
        }else {
            //没有登录，就重定向到登录页
            response.sendRedirect("/page/login.html");
        }
        return false;
    }

    @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 {

    }
}

LoginController控制器

package com.controller;

import com.model.entity.R;
import com.model.entity.User;
import com.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@RestController
public class LoginController {
    @Autowired
    private UserService userService;
    @PostMapping("/login")
    public R login(@RequestBody User user, HttpServletRequest request){
        User one = userService.findByPwd(user);
        if (one != null){
            request.getSession().setAttribute("user",one);
            return R.ok("登录成功");
        }
        return R.fail("账号或密码错误");
    }

    @GetMapping("/logout")
    public void logout(HttpServletRequest request, HttpServletResponse response) throws IOException {
        request.getSession().removeAttribute("user");
        response.sendRedirect("/page/login.html");
    }

}

最后，无偿给大家整个项目文件，进入《亦码》小程序，找到SSM分类源码