SSM整合

ContextLoaderListener

整合Spring和SpringMVC：各自管理自己的组件
SpringMVC的IOC容器在DispatchederServlet初始化时创建
由于SpringMVC的Controller依赖于Spring的Service（内部的Service需要提前装配，因此需要获得Service的bean），因此创建SpringMVC的IOC容器前，需要先创建Spring的IOC容器
Spring提供监听器ContextLoaderListener，实现ServletContextListener接口，可监听 ServletContext 的状态（启动与关闭）
- public void contextInitialize

监听器在Servlet创建之前创建，并且只执行一次初始化，可以利用这一特点，在Web服务器的启动时读取 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

<!--配置Spring的监听器，在服务器启动时加载Spring的配置文件-->
<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
  
<!--设置Spring配置文件自定义的位置和名称-->
<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:Spring.xml</param-value>
</context-param>

这里，SpringMVC的IOC容器，能够访问Spring的IOC容器内容——Spring是父容器，子容器可以访问父容器的bean

配置

依赖（pom.xml）：

<properties>
       <maven.compiler.source>8</maven.compiler.source>
       <maven.compiler.target>8</maven.compiler.target>
  
       <spring.version>5.2.14.RELEASE</spring.version>
   </properties>
   <packaging>war</packaging>
  
   <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>2.0.4</version>
       </dependency>
       <!-- 连接池 -->
       <dependency>
           <groupId>com.alibaba</groupId>
           <artifactId>druid</artifactId>
           <version>1.1.23</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>5.1.3</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>

创建表格：

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

web.xml：

<!--配置Spring的编码过滤器-->
<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>
    <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>
  
<!--配置处理请求方式的过滤器-->
<filter>
    <filter-name>HiddenHttpMethodFilter</filter-name>
    <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>
</filter>
<filter-mapping>
    <filter-name>HiddenHttpMethodFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>
  
<!--配置SpringMVC的前端控制器DispatcherServlet-->
<servlet>
    <servlet-name>SpringMVC</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <!--设置SpringMVC配置文件自定义的位置和名称-->
    <init-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:SpringMVC.xml</param-value>
    </init-param>
    <!--将DispatcherServlet的初始化时间提前到服务器启动时-->
    <load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
    <servlet-name>SpringMVC</servlet-name>
    <url-pattern>/</url-pattern>
</servlet-mapping>
  
<!--配置Spring的监听器，在服务器启动时加载Spring的配置文件-->
<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
  
<!--设置Spring配置文件自定义的位置和名称-->
<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:Spring.xml</param-value>
</context-param>

SpringMVC.xml：

MyBatis环境：

属性文件（jdbc.properties）：

jdbc.user=root
jdbc.password=123456
jdbc.url=jdbc:mysql://localhost:3306/testssm?useUnicode=true&characterEncoding=utf8
jdbc.driver=com.mysql.jdbc.Driver

核心配置文件（mybatis-config.xml）：

<configuration>

    <!--
        MyBatis核心配置文件中的标签必须要按照指定的顺序配置：
        properties?,settings?,typeAliases?,typeHandlers?,
        objectFactory?,objectWrapperFactory?,reflectorFactory?,
        plugins?,environments?,databaseIdProvider?,mappers?
    -->

    <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>

日志配置（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>

Spring配置：

<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:tx="http://www.springframework.org/schema/tx"
       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 http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">

    <!--扫描组件（除控制层），控制层的组件由SpringMVC.xml负责扫描-->
    <context:component-scan base-package="Service">
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>

    <!--引入jdbc.properties-->
    <context:property-placeholder location="classpath:jdbc.properties"/>

    <!--配置数据源-->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="${jdbc.driver}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.user}"/>
        <property name="password" value="${jdbc.password}"/>
    </bean>

    <!--配置事务管理器-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <!--
        开启事务的注解驱动，使用注解@Transactional标识方法或类中所有的方法进行事务管理
    -->
    <tx:annotation-driven transaction-manager="transactionManager" />

    <!--配置SqlSessionFactoryBean，可以直接在Spring的IOC中获取SqlSessionFactory-->
    <bean class="org.mybatis.spring.SqlSessionFactoryBean">
        <!--设置MyBatis的核心配置文件的路径-->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
        <!--设置数据源-->
        <property name="dataSource" ref="dataSource"/>
        <!--设置类型别名所对应的包-->
        <property name="typeAliasesPackage" value="Pojo"/>
        <!--设置映射文件的路径，只有映射文件的包和mapper接口的包不一致时需要设置-->
        <property name="mapperLocations" value="classpath:mappers/*.xml"/>
    </bean>

    <!--
        配置mapper接口的扫描，可以将指定包下所有的mapper接口
        通过SqlSession创建代理实现类对象，并将这些对象交给IOC容器管理
    -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="Mapper"/>
    </bean>

</beans>

Dao层：

实体类：

package Pojo;

public class Employee {
    private Integer empId;
    private String empName;
    private Integer age;
    private String gender;
    private String email;
    public Employee() {
    }
    public Employee(Integer empId, String empName, Integer age, String gender, String email) {
        this.empId = empId;
        this.empName = empName;
        this.age = age;
        this.gender = gender;
        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 getGender() {
        return gender;
    }
    public void setGender(String gender) {
        this.gender = gender;
    }
    public String getEmail() {
        return email;
    }
    public void setEmail(String email) {
        this.email = email;
    }
    @Override
    public String toString() {
        return "Employee{" +
                "empId=" + empId +
                ", empName='" + empName + '\'' +
                ", age=" + age +
                ", gender='" + gender + '\'' +
                ", email='" + email + '\'' +
                '}';
    }
}

mapper：

映射接口：

package Mapper;

import Pojo.Employee;

import java.util.List;

public interface EmployeeMapper {

    /**
     * 查询所有的员工信息
     * @return
     */
    List<Employee> getAllEmployee();
}

映射文件：

<?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">

<mapper namespace="Mapper.EmployeeMapper">

    <!--List<Employee> getAllEmployee();-->
    <select id="getAllEmployee" resultType="Employee">
        select * from t_emp
    </select>

</mapper>

Service层：

Service接口：

package Service;

import Pojo.Employee;
import com.github.pagehelper.PageInfo;

import java.util.List;


public interface EmployeeService {

    /**
     * 查询所有的员工信息
     * @return
     */
    List<Employee> getAllEmployee();

    /**
     * 获取员工的分页信息
     * @param pageNum
     * @return
     */
    PageInfo<Employee> getEmployeePage(Integer pageNum);
}

Service实现类：

package Service.Imp;

import Mapper.EmployeeMapper;
import Pojo.Employee;
import Service.EmployeeService;
import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

@Service
@Transactional
public class EmployeeServiceImpl implements EmployeeService {

    @Autowired
    private EmployeeMapper employeeMapper;

    @Override
    public List<Employee> getAllEmployee() {
        return employeeMapper.getAllEmployee();
    }

    @Override
    public PageInfo<Employee> getEmployeePage(Integer pageNum) {
        //开启分页功能
        PageHelper.startPage(pageNum, 4);
        //查询所有的员工信息
        List<Employee> list = employeeMapper.getAllEmployee();
        //获取分页相关数据
        return new PageInfo<>(list, 5);
    }
}

Controller层：

package Controller;

import Pojo.Employee;
import Service.EmployeeService;
import com.github.pagehelper.PageInfo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import java.util.List;

@Controller
public class EmployeeController {

    @Autowired
    private EmployeeService employeeService;

    @RequestMapping(value = "/employee/page/{pageNum}", method = RequestMethod.GET)
    public String getEmployeePage(@PathVariable("pageNum") Integer pageNum, Model model){
        //获取员工的分页信息
        PageInfo<Employee> page = employeeService.getEmployeePage(pageNum);
        //将分页数据共享到请求域中
        model.addAttribute("page", page);
        //跳转到employee_list.html
        return "employee_list";
    }

    @RequestMapping(value = "/employee", method = RequestMethod.GET)
    public String getAllEmployee(Model model){
        //查询所有的员工信息
        List<Employee> list = employeeService.getAllEmployee();
        //将员工信息在请求域中共享
        model.addAttribute("list", list);
        //跳转到employee_list.html
        return "employee_list";
    }

}

视图：

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>员工列表</title>
    <link rel="stylesheet" th:href="@{/static/css/index_work.css}">
</head>
<body>
<table>
    <tr>
        <th colspan="6">员工列表</th>
    </tr>
    <tr>
        <th>流水号</th>
        <th>员工姓名</th>
        <th>年龄</th>
        <th>性别</th>
        <th>邮箱</th>
        <th>操作</th>
    </tr>
    <tr th:each="employee,status : ${page.list}">
        <td th:text="${status.count}"></td>
        <td th:text="${employee.empName}"></td>
        <td th:text="${employee.age}"></td>
        <td th:text="${employee.gender}"></td>
        <td th:text="${employee.email}"></td>
        <td>
            <a href="">删除</a>
            <a href="">修改</a>
        </td>
    </tr>
</table>
<div style="text-align: center;">
    <a th:if="${page.hasPreviousPage}" th:href="@{/employee/page/1}">首页</a>
    <a th:if="${page.hasPreviousPage}" th:href="@{'/employee/page/'+${page.prePage}}">上一页</a>
    <span th:each="num : ${page.navigatepageNums}">
        <a th:if="${page.pageNum == num}" style="color: red;" th:href="@{'/employee/page/'+${num}}" th:text="'['+${num}+']'"></a>
        <a th:if="${page.pageNum != num}" th:href="@{'/employee/page/'+${num}}" th:text="${num}"></a>
    </span>
    <a th:if="${page.hasNextPage}" th:href="@{'/employee/page/'+${page.nextPage}}">下一页</a>
    <a th:if="${page.hasNextPage}" th:href="@{'/employee/page/'+${page.pages}}">末页</a>
</div>
</body>
</html>

1	<a th:href="@{/employee/page/1}">查询员工的分页信息</a>

结构：