SSM 之案例整合-阿里云开发者社区

四、SSM整合案例

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
  -->
    <listener-class>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>

2、案例一

2.1、准备工作

① 创建Maven Module

② 引入项目依赖

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.jingchao</groupId>
  <artifactId>ssm</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>war</packaging>
  <properties>
    <spring.version>5.3.18</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>3.5.10</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>1.2.9</version>
    </dependency>
    <!-- Junit测试 -->
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.13.2</version>
      <scope>test</scope>
    </dependency>
    <!-- MySQSL驱动 -->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>8.0.28</version>
    </dependency>
    <!-- log4j日志 -->
    <dependency>
      <groupId>log4j</groupId>
      <artifactId>log4j</artifactId>
      <version>1.2.17</version>
    </dependency>
    <!-- Pagehelper分页 -->
    <dependency>
      <groupId>com.github.pagehelper</groupId>
      <artifactId>pagehelper</artifactId>
      <version>5.3.0</version>
    </dependency>
    <!-- 日志 -->
    <dependency>
      <groupId>ch.qos.logback</groupId>
      <artifactId>logback-classic</artifactId>
      <version>1.2.11</version>
    </dependency>
    <!-- ServletAPI -->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>4.0.1</version>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
      <version>2.13.2.2</version>
    </dependency>
    <dependency>
      <groupId>commons-fileupload</groupId>
      <artifactId>commons-fileupload</artifactId>
      <version>1.4</version>
    </dependency>
    <!-- Spring和Thymeleaf整合包 -->
    <dependency>
      <groupId>org.thymeleaf</groupId>
      <artifactId>thymeleaf-spring5</artifactId>
      <version>3.0.14.RELEASE</version>
    </dependency>
  </dependencies>
</project>

③ 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

2.2、配置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 -->
<servlet>
    <servlet-name>DispatcherServlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <!-- 设置SpringMVC配置文件自定义位置和名称 -->
    <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>DispatcherServlet</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>

2.3、配置SpringMVC的配置文件

<!-- 扫描控制层组件 -->
<context:component-scan base-package="com.jingchao.ssm.controller"/>
<!--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/>
<!-- 配置视图控制器 -->
<mvc:view-controller path="/" view-name="index"/>
<!-- 配置文件上传解析器 -->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"/>

2.4、搭建MyBatis环境

① 创建属性文件jdbc.properties

jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/ssm?serverTimezone=UTC
jdbc.username=root
jdbc.password=123456

② 创建MyBatis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>

③ 创建Mapper接口和映射文件

public interface EmployeeMapper {
}

<?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.jingchao.ssm.mapper.EmployeeMapper">
</mapper>

④ 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>

2.5、配置Spring的配置文件

<?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: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） -->
  <context:component-scan base-package="com.jingchao.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"/>
  <!-- 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="${jdbc.username}"/>
    <property name="password" value="${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 -->
  <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="com.jingchao.ssm.pojo"/>
    <!-- 设置映射文件的位置，只有当映射文件和接口的包名不一致的情况才设置 -->
    <!-- <property name="mapperLocations" value="classpath:mapper/*.xml"/> -->
    <!-- 配置插件 -->
    <!-- <property name="plugins">
      <array>
        <bean class="com.github.pagehelper.PageInterceptor"/>
      </array>
    </property> -->
  </bean>
  <!-- 配置mapper接口的扫描，可以将指定包下面的所有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="com.jingchao.ssm.mapper"/>
  </bean>
</beans>

2.6、测试功能

实体类Employee

package com.jingchao.ssm.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 + '\'' +
                '}';
    }
}

创建控制层组件EmployeeController

@Controller
public class EmployeeController {
}

创建接口EmployeeService

public interface EmployeeService {
}

创建实现类EmployeeServiceImpl

@Service
@Transactional
public class EmployeeServiceImpl implements EmployeeService {
}

2.6.1、员工列表

① 控制层

@Controller
public class EmployeeController {
    @Autowired
    private EmployeeService employeeService;
    @GetMapping("/employee")
    public String getAllEmployee(Model model){
        List<Employee> list = employeeService.getAllEmployee();
        model.addAttribute("list",list);
        return "employee_list";
    }
}

② Service接口

public interface EmployeeService {
    /**
     * 查询所有员工信息
     * @return
     */
    List<Employee> getAllEmployee();
}

③ Service实现类

@Service
@Transactional
public class EmployeeServiceImpl implements EmployeeService {
    @Autowired
    private EmployeeMapper employeeMapper;
    @Override
    public List<Employee> getAllEmployee() {
        return employeeMapper.getAllEmployee();
    }
}

④ Mapper接口

public interface EmployeeMapper {
    /**
     * 查询所有员工信息
     * @return
     */
    List<Employee> getAllEmployee();
}

⑤ Mapper映射文件

<mapper namespace="com.jingchao.ssm.mapper.EmployeeMapper">
  <!-- List<Employee> getAllEmployee(); -->
  <select id="getAllEmployee" resultType="Employee">
    select * from t_emp
  </select>
</mapper>

⑥ 创建employee_list页面

<!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 : ${list}">
        <td th:text="${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>
</body>
</html>

在index页面提供超链接

<a th:href="@{/employee}">查询所有员工信息</a>

2.6.2、分页功能

在员工列表的基础上实现分页功能

① 控制层

@GetMapping("/employee/page/{pageNum}")
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);
    return "employee_list_page";
}

② Service接口

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

③ Service实现类

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

④ 创建employee_list_old页面

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>员工分页列表</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>

⑤ 效果预览

SSM 之案例整合

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