SSM整合案例--用户登录

实现用户登录案例，并进行非法拦截

实现当用户未登录时，无法跳转到出登录页面以外的任何页面，拦截用户仍在登陆页面；当用户登录成功即可跳转到其他页面

（1）导入依赖

<!-- https://mvnrepository.com/artifact/org.springframework/spring-beans -->
 <dependency>
   <groupId>org.springframework</groupId>
   <artifactId>spring-beans</artifactId>
   <version>5.1.5.RELEASE</version>
 </dependency>
 <!-- https://mvnrepository.com/artifact/org.springframework/spring-context -->
 <dependency>
   <groupId>org.springframework</groupId>
   <artifactId>spring-context</artifactId>
   <version>5.1.5.RELEASE</version>
 </dependency>
 <dependency>
   <groupId>org.aspectj</groupId>
   <artifactId>aspectjweaver</artifactId>
   <version>1.7.0</version>
 </dependency>
 <dependency>
   <groupId>org.springframework</groupId>
   <artifactId>spring-jdbc</artifactId>
   <version>5.1.5.RELEASE</version>
 </dependency>
 <dependency>
   <groupId>mysql</groupId>
   <artifactId>mysql-connector-java</artifactId>
   <version>5.1.32</version>
 </dependency>
 <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis-spring -->
 <dependency>
   <groupId>org.mybatis</groupId>
   <artifactId>mybatis-spring</artifactId>
   <version>1.3.2</version>
 </dependency>
 <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
 <dependency>
   <groupId>org.mybatis</groupId>
   <artifactId>mybatis</artifactId>
   <version>3.4.6</version>
 </dependency>
 <!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
 <dependency>
   <groupId>org.springframework</groupId>
   <artifactId>spring-webmvc</artifactId>
   <version>5.1.5.RELEASE</version>
 </dependency>
 <!-- https://mvnrepository.com/artifact/org.springframework/spring-web -->
 <dependency>
   <groupId>org.springframework</groupId>
   <artifactId>spring-web</artifactId>
   <version>5.1.5.RELEASE</version>
 </dependency>
 <dependency>
   <groupId>com.fasterxml.jackson.core</groupId>
   <artifactId>jackson-core</artifactId>
   <version>2.9.8</version>
 </dependency>

 <dependency>
   <groupId>com.fasterxml.jackson.core</groupId>
   <artifactId>jackson-annotations</artifactId>
   <version>2.9.8</version>
 </dependency>

 <dependency>
   <groupId>com.fasterxml.jackson.core</groupId>
   <artifactId>jackson-databind</artifactId>
   <version>2.9.8</version>
 </dependency>
 <!-- https://mvnrepository.com/artifact/javax/javaee-api -->
 <dependency>
   <groupId>javax</groupId>
   <artifactId>javaee-api</artifactId>
   <version>7.0</version>
   <scope>provided</scope>
 </dependency>
 <dependency>
   <groupId>com.github.pagehelper</groupId>
   <artifactId>pagehelper</artifactId>
   <version>4.1.0</version>
 </dependency>
 <dependency>
   <groupId>log4j</groupId>
   <artifactId>log4j</artifactId>
   <version>1.2.17</version>
 </dependency>
 <dependency>
   <groupId>com.alibaba</groupId>
   <artifactId>fastjson</artifactId>
   <version>1.2.22</version>
 </dependency>
 <dependency>
   <groupId>com.fasterxml.jackson.core</groupId>
   <artifactId>jackson-core</artifactId>
   <version>${jackson.version}</version>
 </dependency>
 <dependency>
   <groupId>com.fasterxml.jackson.core</groupId>
   <artifactId>jackson-databind</artifactId>
   <version>${jackson.version}</version>
 </dependency>
 <!-- https://mvnrepository.com/artifact/commons-io/commons-io -->
 <dependency>
   <groupId>commons-io</groupId>
   <artifactId>commons-io</artifactId>
   <version>2.4</version>
 </dependency>
 <!-- https://mvnrepository.com/artifact/commons-fileupload/commons-fileupload -->
 <dependency>
   <groupId>commons-fileupload</groupId>
   <artifactId>commons-fileupload</artifactId>
   <version>1.3.1</version>
 </dependency>
 <!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-validator -->
 <dependency>
   <groupId>org.hibernate</groupId>
   <artifactId>hibernate-validator</artifactId>
   <version>5.4.1.Final</version>
 </dependency>
 <dependency>
   <groupId>org.apache.commons</groupId>
   <artifactId>commons-lang3</artifactId>
   <version>3.3.2</version>
 </dependency>
 <!-- https://mvnrepository.com/artifact/jstl/jstl -->
 <dependency>
   <groupId>jstl</groupId>
   <artifactId>jstl</artifactId>
   <version>1.2</version>
 </dependency>
 <!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
 <dependency>
   <groupId>javax.servlet</groupId>
   <artifactId>javax.servlet-api</artifactId>
   <version>4.0.1</version>
   <scope>provided</scope>
</dependency>
 <dependency>
   <groupId>javax.servlet</groupId>
   <artifactId>javax.servlet-api</artifactId>
   <version>3.1.0</version>
   <scope>provided</scope>
 </dependency>

代码实现

（2）jdbc.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/invoicingsystem?useUniCode=true&characterEncoding=utf-8
jdbc.username=root
jdbc.password=123

代码实现

（3）mybatis-config.xml配置文件

<?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="LOG4J"/>
    </settings>

    <!--配置别名-->
    <typeAliases>
        <package name="com.invoicingsystem.entity"/>
    </typeAliases>

    <!-- 引入 pageHelper插件 -->
    <!--注意这里要写成PageInterceptor, 5.0之前的版本都是写PageHelper, 5.0之后要换成PageInterceptor-->
    <plugins>
        <plugin interceptor="com.github.pagehelper.PageHelper"></plugin>
    </plugins>

    <!--加载小配置文件-->
    <mappers>
        <package name="com.invoicingsystem.dao"/>
    </mappers>

</configuration>

代码实现

（4）applicationContext.xml配置文件

<?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/context http://www.springframework.org/schema/context/spring-context.xsd  http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <!--1.导入jdbc.properties文件-->
    <bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="locations" >
            <array>
                <value>classpath*:*.properties</value>
            </array>
        </property>
    </bean>
    <!--2.配置数据源   spring内置的数据源-->
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="${jdbc.driver}"></property>
        <property name="url" value="${jdbc.url}"></property>
        <property name="username" value="${jdbc.username}"></property>
        <property name="password" value="${jdbc.password}"></property>
    </bean>

    <!--3.配置mybatis的核心对象SqlSessionFatcoryBean-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"></property>
        <property name="typeAliasesPackage" value="com.invoicingsystem.entity"></property>
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
    </bean>

    <!--4.Mybatis的Dao接口的包扫描器(借助Dao接口生成动态代理)-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.invoicingsystem.dao"></property>
    </bean>

    <!--开启各种注解配置-->
    <mvc:annotation-driven/>

    <context:component-scan base-package="com.invoicingsystem"></context:component-scan>
    <!--配置视图解析器-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/jsp/"></property>
        <!--return "index"  /jsp/.jsp-->
        <property name="suffix" value=".jsp"></property>
    </bean>

    <!--释放静态资源-->
    <mvc:default-servlet-handler/>

</beans>

代码实现

（5）web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
         http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">
  <servlet>
    <servlet-name>SpringMVC</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:applicationContext.xml</param-value>
    </init-param>
  </servlet>

  <servlet-mapping>
    <servlet-name>SpringMVC</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>

  <!--spring和mytatis整合的核心配置-->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath*:applicationContext.xml</param-value>
  </context-param>
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
</web-app>

代码实现

（6）User实体类

package com.invoicingsystem.entity;

import org.springframework.stereotype.Repository;

@Repository
public class User {
    private  Integer uid;
    private  String userName;
    private  String password;
    private  String realName;

    public Integer getUid() {
        return uid;
    }

    public void setUid(Integer uid) {
        this.uid = uid;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getRealName() {
        return realName;
    }

    public void setRealName(String realName) {
        this.realName = realName;
    }
}

代码实现

（7）UserDao层

package com.invoicingsystem.dao;

import com.invoicingsystem.entity.User;
import org.springframework.stereotype.Repository;

@Repository
public interface UserDao {
    //登录的方法
    public User login(User user);
}

代码实现

（8）UserDao.xml小配置文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<!--namespace需要指向接口全路径-->
<mapper namespace="com.invoicingsystem.dao.UserDao">

    <select id="login" resultType="com.invoicingsystem.entity.User">
        select * from users where userName=#{userName} and password=#{password}
    </select>
</mapper>

代码实现

（9）UserService层

package com.invoicingsystem.service;

import com.invoicingsystem.entity.User;

public interface UserService {
    //登录的方法
    public User login(User user);
}

代码实现

（10）UserServiceImpl

package com.invoicingsystem.service.impl;

import com.invoicingsystem.dao.UserDao;
import com.invoicingsystem.entity.User;
import com.invoicingsystem.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service("userService")
public class UserServiceImpl implements UserService {

    @Autowired
    UserDao userDao;

    @Override
    public User login(User user) {
        return userDao.login(user);
    }
}

代码实现

（11）UserController

package com.invoicingsystem.controller;

import com.invoicingsystem.entity.User;
import com.invoicingsystem.service.UserService;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.ModelAndView;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@Controller
@RequestMapping(value = "/user")
public class UserController {
    @Resource
    UserService userService;
    @RequestMapping("/login")
    @ResponseBody
    public ModelAndView login(User user,HttpServletRequest request, HttpServletResponse response,ModelAndView modelAndView){
        User login = userService.login(user);
        if (login!=null){
            System.out.println("登陆成功！");
            request.getSession().setAttribute("login",login);
            modelAndView.setViewName("index");
        }else {
            modelAndView.setViewName("login");
        }
        return modelAndView;
    }
}

代码实现

（12）LoginFilter拦截

package com.invoicingsystem.filter;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;

@WebFilter(urlPatterns = {"/*"})
public class LoginFilter implements Filter {

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest servletRequest=(HttpServletRequest) request;
        //放行URL
        if(servletRequest.getRequestURI().equals("/user/login")){
            filterChain.doFilter(request,response);
        }
        Object user = servletRequest.getSession().getAttribute("user");
        if (user==null){
            servletRequest.getRequestDispatcher("login.jsp").forward(request,response);
        }else {
            //放行请求
            filterChain.doFilter(request,response);
        }
    }

    @Override
    public void destroy() {

    }
}

代码实现

（13）login.jsp页面

<!DOCTYPE html>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title>系统登录 - 小型进销存系统</title>
    <link rel="stylesheet" href="css/style.css"/>
    <style>
        #parent{
            width:500px;
            height:200px;
            margin-top:20%;
            margin-left:50%;
            transform:translate(-50%,-50%) ;
            background:#009688;
        }
        .password,.subBtn{
            margin-top: 2%;
            margin-left: 3%;
        }
        .loginHeader{
             padding-top: 1%;
        }
    </style>
</head>
<body class="login_bg">
<div id="parent">
<section class="loginBox">
    <header class="loginHeader" style="text-align:center; ">
        <h1>小型进销存系统</h1>
    </header>
    <section class="loginCont">
        <form class="loginForm" action="/user/login" method="post" onsubmit="return check()" >
            <div class="inputbox"  style="text-align:center; ">
                <label for="user">用户名：</label>
                <input id="user" type="text" name="userName" placeholder="请输入用户名" />
            </div>
            <div class="password"  style="text-align:center; " >
                <label for="mima">密码：</label>
                <input id="mima" type="password" name="password" placeholder="请输入密码" />
            </div>
            <div class="subBtn"  style="text-align:center; ">
                <input type="submit" value="登录" />
                <input type="reset" value="重置"/>
            </div>
        </form>
    </section>
</section>
</div>
<script src="/js/jquery.js"></script>
<script>
    function check(){
        var user=$("#user").val();
        var mima=$("#mima").val();
        if (user==""){
            alert("请输入用户名！");
            return false;
        } else if (mima==""){
            alert("请输入密码");
            return false;
        }
    }
</script>
</body>
</html>

代码实现