SSM整合

整合思路

• 各自搭建SSM环境
• 使用Spring整合Mybatis
• 使用Spring整合SpringMVC

搭建Mybatis环境

创建工程

Maven项目-web工程

引入mybatis坐标

<dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.6</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.0</version>
        </dependency>
<!--        辅助-->
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.12</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>

创建pojo

public class Account {
    private Integer aid;
    private String name;
    private Float balance;

    @Override
    public String toString() {
        return "Account{" +
                "aid=" + aid +
                ", name='" + name + '\'' +
                ", balance=" + balance +
                '}';
    }

    public Integer getAid() {
        return aid;
    }

    public void setAid(Integer aid) {
        this.aid = aid;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Float getBalance() {
        return balance;
    }

    public void setBalance(Float balance) {
        this.balance = balance;
    }
}

创建接口IAccountDao

public interface IAccountDao {
    List<Account> findAll();
}

创建dao映射文件sql

<mapper namespace="com.itheima.dao.IAccountDao">
    <select id="findAll" resultType="account">
        SELECT * FROM tb_account;
    </select>
</mapper>

加入主配置文件

mybatis-config.xml

<configuration>
    <!--    引入数据库外部配置文件-->
    <properties resource="db.properties"/>
    <!--    引入别名-->
    <typeAliases>
        <package name="com.itheima.domain"/>
    </typeAliases>
    <environments default="dev">
        <environment id="dev">
            <transactionManager type="JDBC"/>

            <dataSource type="POOLED">
                <property name="driver" value="${jdbc.driver}"/>
                <property name="url" value="${jdbc.url}"/>
                <property name="username" value="${jdbc.user}"/>
                <property name="password" value="${jdbc.password}"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <package name="com.itheima.dao"/>
    </mappers>
</configuration>

• db.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql:///spring_lsn
jdbc.user=root
jdbc.password=xml123xml

• 测试

 @Test
    public void testAccountDao() {
        //读取配置文件
        try {
            InputStream inputStream = Resources.getResourceAsStream("mybatis-config.xml");
            SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
            SqlSession sqlSession = sessionFactory.openSession();
            IAccountDao accountDao = sqlSession.getMapper(IAccountDao.class);
            List<Account> accounts = accountDao.findAll();
            accounts.stream().forEach(account -> System.out.println(account));
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

搭建Spring的环境

• 创建IAccountService

public interface IAccountService {
    
    List<Account> findAll();
}

• 创建IAccountServiceImpl实现类

public class AccountService implements IAccountService {
    @Autowired
    private IAccountDao accountDao;
    
    @Override
    public List<Account> findAll() {
        return accountDao.findAll();
    }
}

• 测试

 @Override
    public List<Account> findAll() {
        System.out.println("findAll");
        return null;
//        return accountDao.findAll();
    }

搭建SpringMVC环境

• 引入坐标

<!--springMVC 相关-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.1.6.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.0</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>jstl</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>

• 加入springmvc的配置文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/mvc
        https://www.springframework.org/schema/mvc/spring-mvc.xsd
        http://www.springframework.org/schema/aop
        https://www.springframework.org/schema/aop/spring-aop.xsd
        http://www.springframework.org/schema/context
        https://www.springframework.org/schema/context/spring-context.xsd">

    <!--        配置注解扫描-->
    <context:component-scan base-package="com.itheima.controller"/>
    <!--    配置三大组件-->
    <mvc:annotation-driven/>
    <!--    配置视图解析器-->
    <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
</beans>

• 加入web配置文件

<?xml version="1.0" encoding="utf-8"?>
<web-app version="3.0"
         xmlns="http://java.sun.com/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
        http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
    <!--    配置前端适配器-->
    <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:spring-mvc.xml</param-value>
        </init-param>
    </servlet>
    <servlet-mapping>
        <servlet-name>dispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
    <!--    配置中文乱码过滤器-->
    <filter>
        <filter-name>characterEncodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>characterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

</web-app>

• 请求页面

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<a href="${pageContext.request.contextPath}/account/list">账户列表</a>
</body>
</html>

• 控制器

/**
 * @author wangxin
 * @date 2019/12/15 16:48
 * @description: TODO
 * GOOD LUCK！
 */
@Controller
public class AccountController {
    @RequestMapping("/account/list")
    public String list(Model model) {
        model.addAttribute("list", "list");
        return "list";
    }

}

• 响应页面

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
${list}
</body>
</html>

Spring整合Mybatis

整合思路

将Mybatis的SqlSessionFactory托管到Spring的IOC容器中

将mybatis的所有配置信息转移到Spring的配置文件中

mybatis提供一个对接spring的中间包

加入整合包

<!--mybatis整合Spring-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.1</version>
        </dependency>

将mybatis的所有配置文件转移到spring的配置文件中

<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 http://www.springframework.org/schema/context/spring-context.xsd">
    <!--    注解扫描-->
    <context:component-scan base-package="com.itheima.service"/>
    <!--    引入外部配置-->
    <context:property-placeholder location="classpath:db.properties"/>
    <!--    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>
    <!--    配置sqlSessionFactory-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <property name="typeAliasesPackage" value="com.itheima.domain"/>
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
    </bean>
    <!--    引入mapper的配置文件-->
    <bean id="mapperScannerConfigurer" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.itheima.dao"/>
    </bean>
</beans>

• 将dao注入到Service

@Service
public class AccountServiceImpl implements IAccountService {
    @Autowired
    private IAccountDao accountDao;

    @Override
    public List<Account> findAll() {
        List<Account> accounts = accountDao.findAll();
        System.out.println(accounts);
        return null;
//        return accountDao.findAll();
    }
}

Spring整合SpringMVC

Spring和SpringMVC是同一家产品，是不需要整合的

但是现在的Spring容器自己无法启动，我们需要在启动Web容器的时候加载Spring的配置文件，启动Spring容器那么这个工作是在spring-web包中监听器来做的，这个包不用单独导入，他已经在Spring-webmvc包中了，它会监听WEB容器的启动和停止，然后就可以控制Spring容器的启动和停止了

• 配置监听器

<listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

• 向SpringMVC中注入service

@Service
public class AccountServiceImpl implements IAccountService {
    @Autowired
    private IAccountDao accountDao;

    @Override
    public List<Account> findAll() {
        List<Account> accounts = accountDao.findAll();
        System.out.println(accounts);
        return null;
//        return accountDao.findAll();
    }
}