1.1、ContextLoaderListener

Spring提供了监听器ContextLoaderListener，实现ServletContextListener接口，可监听ServletContext的状态，在web服务器的启动，读取Spring的配置文件，创建Spring的IOC容器。web应用中必须在web.xml中配置

<listener>
<!--
配置Spring的监听器，在服务器启动时加载Spring的配置文件
Spring配置文件默认位置和名称：/WEB-INF/applicationContext.xml
可通过上下文参数自定义Spring配置文件的位置和名称
-->
<listenerclass>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!--自定义Spring配置文件的位置和名称-->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring.xml</param-value>
</context-param>

1.2、创建maven，导入依赖

<packaging>war</packaging>
<properties>
<spring.version>5.3.1</spring.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>${spring.version}</version>
</dependency>
<!--springmvc-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aspects</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${spring.version}</version>
</dependency>
<!-- Mybatis核心 -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.7</version>
</dependency>
<!--mybatis和spring的整合包-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>2.0.6</version>
</dependency>
<!-- 连接池 -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.0.9</version>
</dependency>
<!-- junit测试 -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<!-- MySQL驱动 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.16</version>
</dependency>
<!-- log4j日志 -->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.github.pagehelper/pagehelper -->
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper</artifactId>
<version>5.2.0</version>
</dependency>
<!-- 日志 -->
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>1.2.3</version>
</dependency>
<!-- ServletAPI -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.12.1</version>
</dependency>
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3.1</version>
</dependency>
<!-- Spring5和Thymeleaf整合包 -->
<dependency>
<groupId>org.thymeleaf</groupId>
<artifactId>thymeleaf-spring5</artifactId>
<version>3.0.12.RELEASE</version>
</dependency>
</dependencies>

创建表：

CREATE TABLE `t_emp` (
`emp_id` int(11) NOT NULL AUTO_INCREMENT,
`emp_name` varchar(20) DEFAULT NULL,
`age` int(11) DEFAULT NULL,
`sex` char(1) DEFAULT NULL,
`email` varchar(50) DEFAULT NULL,
PRIMARY KEY (`emp_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8

1.3、配置web.xml文件

<!-- 配置Spring的编码过滤器 -->
<filter>
<filter-name>CharacterEncodingFilter</filter-name>
<filterclass>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
<init-param>
<param-name>forceEncoding</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>CharacterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- 配置处理请求方式PUT和DELETE的过滤器 -->
<filter>
<filter-name>HiddenHttpMethodFilter</filter-name>
<filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filterclass>
</filter>
<filter-mapping>
<filter-name>HiddenHttpMethodFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- 配置SpringMVC的前端控制器 -->
<servlet>
<servlet-name>DispatcherServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servletclass>
<!-- 设置SpringMVC的配置文件的位置和名称 -->
<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>
<!-- 设置Spring的配置文件的位置和名称 -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:Spring.xml</param-value>
</context-param>
<!-- 配置Spring的监听器 -->
<listener>
<listenerclass>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

1.4、创建SpringMVC的配置文件并配置

<!--扫描组件-->
<context:component-scan base-package="com.atguigu.ssm.controller">
</context:component-scan>
<!--配置视图解析器-->
<bean id="viewResolver"
class="org.thymeleaf.spring5.view.ThymeleafViewResolver">
<property name="order" value="1"/>
<property name="characterEncoding" value="UTF-8"/>
<property name="templateEngine">
<bean class="org.thymeleaf.spring5.SpringTemplateEngine">
<property name="templateResolver">
<bean
class="org.thymeleaf.spring5.templateresolver.SpringResourceTemplateResolver">
<!-- 视图前缀 -->
<property name="prefix" value="/WEB-INF/templates/"/>
<!-- 视图后缀 -->
<property name="suffix" value=".html"/>
<property name="templateMode" value="HTML5"/>
<property name="characterEncoding" value="UTF-8" />
</bean>
</property>
</bean>
</property>
</bean>
<!-- 配置访问首页的视图控制 -->
<mvc:view-controller path="/" view-name="index"></mvc:view-controller>
<!-- 配置默认的servlet处理静态资源 -->
<mvc:default-servlet-handler />
<!-- 开启MVC的注解驱动 -->
<mvc:annotation-driven />

1.5、搭建mybatis环境

1. 创建属性文件jdbc.properties

jdbc.user=root
jdbc.password=atguigu
jdbc.url=jdbc:mysql://localhost:3306/ssm?serverTimezone=UTC
jdbc.driver=com.mysql.cj.jdbc.Driver

1. 创建MyBatis的核心配置文件mybatis-config.xml

<?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>
<!--将下划线映射为驼峰-->
<setting name="mapUnderscoreToCamelCase" value="true"/>
</settings>
<plugins>
<!--配置分页插件-->
<plugin interceptor="com.github.pagehelper.PageInterceptor"></plugin>
</plugins>
</configuration>

1. 创建Mapper接口和映射文件

public interface EmployeeMapper {
List<Employee> getEmployeeList();
}

<?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">
<mapper namespace="com.atguigu.ssm.mapper.EmployeeMapper">
<select id="getEmployeeList" resultType="Employee">
select * from t_emp
</select>
</mapper>

1. 创建日志文件log4j.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
<appender name="STDOUT" class="org.apache.log4j.ConsoleAppender">
<param name="Encoding" value="UTF-8" />
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="%-5p %d{MM-dd HH:mm:ss,SSS}
%m (%F:%L) \n" />
</layout>
</appender>
<logger name="java.sql">
<level value="debug" />
</logger>
<logger name="org.apache.ibatis">
<level value="info" />
</logger>
<root>
<level value="debug" />
<appender-ref ref="STDOUT" />
</root>
</log4j:configuration>
<?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"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
https://www.springframework.org/schema/context/spring-context.xsd">
<!--扫描组件-->
<context:component-scan base-package="com.atguigu.ssm">
<context:exclude-filter type="annotation"
expression="org.springframework.stereotype.Controller"/>
</context:component-scan>
<!-- 引入jdbc.properties -->
<context:property-placeholder location="classpath:jdbc.properties">
</context:property-placeholder>
<!-- 配置Druid数据源 -->
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
<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>
<!-- 配置用于创建SqlSessionFactory的工厂bean -->
<bean class="org.mybatis.spring.SqlSessionFactoryBean">
<!-- 设置MyBatis配置文件的路径（可以不设置） -->
<property name="configLocation" value="classpath:mybatis-config.xml">
</property>
<!-- 设置数据源 -->
<property name="dataSource" ref="dataSource"></property>
<!-- 设置类型别名所对应的包 -->
<property name="typeAliasesPackage" value="com.atguigu.ssm.pojo">
</property>
<!--
设置映射文件的路径
若映射文件所在路径和mapper接口所在路径一致，则不需要设置
-->
<!--
<property name="mapperLocations" value="classpath:mapper/*.xml">
</property>
-->
</bean>
<!--
配置mapper接口的扫描配置
由mybatis-spring提供，可以将指定包下所有的mapper接口创建动态代理
并将这些动态代理作为IOC容器的bean管理
-->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.atguigu.ssm.mapper"></property>
</bean>
</beans>

1.6、测试

1.6.1、创建组件

实体类Employee

public class Employee {
private Integer empId;
private String empName;
private Integer age;
private String sex;
private String email;
public Employee() {
}
public Employee(Integer empId, String empName, Integer age, String sex,
String email) {
this.empId = empId;
this.empName = empName;
this.age = age;
this.sex = sex;
this.email = email;
}
public Integer getEmpId() {
return empId;
}
public void setEmpId(Integer empId) {
this.empId = empId;
}
public String getEmpName() {
return empName;
}
public void setEmpName(String empName) {
this.empName = empName;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
}

1.6.2、创建控制层组件EmployeeController

@Controller
public class EmployeeController {
@Autowired
private EmployeeService employeeService;
@RequestMapping(value = "/employee/page/{pageNum}", method =
RequestMethod.GET)
public String getEmployeeList(Model model, @PathVariable("pageNum") Integer
pageNum){
PageInfo<Employee> page = employeeService.getEmployeeList(pageNum);
model.addAttribute("page", page);
return "employee_list";
}
}

1.6.3、创建接口EmployeeService

public interface EmployeeService {
PageInfo<Employee> getEmployeeList(Integer pageNum);
}

1.6.4、创建实现类EmployeeServiceImpl

@Service
public class EmployeeServiceImpl implements EmployeeService {
@Autowired
private EmployeeMapper employeeMapper;
@Override
public PageInfo<Employee> getEmployeeList(Integer pageNum) {
PageHelper.startPage(pageNum, 4);
List<Employee> list = employeeMapper.getEmployeeList();
PageInfo<Employee> page = new PageInfo<>(list, 5);
return page;
}
}

1.6.5、创建页面

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>Employee Info</title>
<link rel="stylesheet" th:href="@{/static/css/index_work.css}">
</head>
<body>
<table>
<tr>
<th colspan="6">Employee Info</th>
</tr>
<tr>
<th>emp_id</th>
<th>emp_name</th>
<th>age</th>
<th>sex</th>
<th>email</th>
<th>options</th>
</tr>
<tr th:each="employee : ${page.list}">
<td th:text="${employee.empId}"></td>
<td th:text="${employee.empName}"></td>
<td th:text="${employee.age}"></td>
<td th:text="${employee.sex}"></td>
<td th:text="${employee.email}"></td>
<td>
<a href="">delete</a>
<a href="">update</a>
</td>
</tr>
<tr>
<td colspan="6">
<span th:if="${page.hasPreviousPage}">
<a th:href="@{/employee/page/1}">首页</a>
<a th:href="@{'/employee/page/'+${page.prePage}}">上一页</a>
</span>
<span th:each="num : ${page.navigatepageNums}">
<a th:if="${page.pageNum==num}"
th:href="@{'/employee/page/'+${num}}" th:text="'['+${num}+']'" style="color:
red;"></a>
<a th:if="${page.pageNum!=num}"
th:href="@{'/employee/page/'+${num}}" th:text="${num} "></a>
</span>
<span th:if="${page.hasNextPage}">
<a th:href="@{'/employee/page/'+${page.nextPage}}">下一页</a>
<a th:href="@{'/employee/page/'+${page.pages}}">末页</a>
</span>
</td>
</tr>
</table>
</body>
</html>

1.6.6、访问分页功能

localhost:8080/employee/page/1

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