Spring

1、Spring IOC入门案例

1）、导入spring坐标(这里版本是5.1.9.RELEASE)

<dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.1.9.RELEASE</version>
        </dependency>
    </dependencies>

2）、编写业务层与表现层接口与实现类

业务层接口：

public interface UserService{
    //业务方法
    public void save();
}

实现类：

public class UserServiceImpl implements UserService {
    public void save() {
        System.out.println("user service running...");
    }
}

3、建立Spring配置文件applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd">
    <!--1、创建Spring控制的资源-->
    <bean id="userService" name="userService1,userService2" class="com.itheima.service.impl.UserServiceImpl"/>
</beans>

4、表现层通过Spring获取资源（Service实例）

public class UserApp {
    public static void main(String[] args) {
        //2.加载配置文件
        ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
        //3.获取资源
        UserService userService = (UserService) ctx.getBean("userService");
        userService.save();
    }
}

Spring整合MyBatis

案例制作步骤-基础准备工作

环境准备

1、导入Spring坐标，MyBatis坐标，MySQL坐标，Druid坐标

pom.xml

<dependencies>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.3</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.47</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.1.9.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.1.9.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.16</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.3.0</version>
        </dependency>
    </dependencies>

2、业务类与接口准备

创建数据库表，并制作相应的实体类Account

Account.java

 public class Account implements Serializable {
 
     private Integer id;
     private String name;
     private Double money;
 
     public Integer getId() {
         return id;
     }
 
     public void setId(Integer id) {
         this.id = id;
     }
 
     public String getName() {
         return name;
     }
 
     public void setName(String name) {
         this.name = name;
     }
 
     public Double getMoney() {
         return money;
     }
 
     public void setMoney(Double money) {
         this.money = money;
     }
 
     @Override
     public String toString() {
         return "Account{" +
                 "id=" + id +
                 ", name='" + name + '\'' +
                 ", money=" + money +
                 '}';
     }
 }

3、定义业务层接口和数据层接口

数据层接口AccountDao.java

public interface AccountDao {

    void save(Account account);

    void delete(Integer id);

    void update(Account account);

    List<Account> findAll();

    Account findById(Integer id);
}

业务层接口AccountService.java

public interface AccountService {
    void save(Account account);
    void delete(Integer id);
    void update(Account account);
    List<Account> findAll();
    Account findById(Integer id);
}

4、在业务层调用数据层接口，并实现业务方法的调用

AccountServiceImpl.java

public class AccountServiceImpl implements AccountService {

    private AccountDao accountDao;

    public void setAccountDao(AccountDao accountDao) {
        this.accountDao = accountDao;
    }

    public void save(Account account) {
        accountDao.save(account);
    }

    public void update(Account account){
        accountDao.update(account);
    }

    public void delete(Integer id) {
        accountDao.delete(id);
    }

    public Account findById(Integer id) {
        return accountDao.findById(id);
    }

    public List<Account> findAll() {
        return accountDao.findAll();
    }
}

配置基础文件

jdbc.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:/spring_db
jdbc.username=root
jdbc.password=root

6、接口映射配置文件

AccountDao.xml(一定要与接口的名字相同)

<?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.itheima.dao.AccountDao">

    <!--配置根据id查询-->
    <select id="findById" resultType="account" parameterType="int">
        select * from account where id = #{id}
    </select>

    <!--配置查询所有-->
    <select id="findAll" resultType="account">
        select * from account
    </select>

    <!--配置保存-->
    <insert id="save" parameterType="account">
        insert into account(name,money)values(#{name},#{money})
    </insert>

    <!--配置删除-->
    <delete id="delete" parameterType="int">
        delete from account where id = #{id}
    </delete>

    <!--配置更新-->
    <update id="update" parameterType="account">
        update account set name=#{name},money=#{money} where id=#{id}
    </update>
</mapper>

7、spring核心配置文件

applicationContext.xml

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

    <!--加载perperties配置文件的信息-->
    <context:property-placeholder location="classpath:jdbc.properties"/>

    <!--加载druid资源-->
    <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service作为spring的bean,注入dao-->
    <bean id="accountService" class="com.itheima.service.impl.AccountServiceImpl">
        <property name="accountDao" ref="accountDao"/>
    </bean>

    <!--spring整合mybatis后控制的创建连接用的对象-->
    <bean class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <property name="typeAliasesPackage" value="com.itheima.domain"/>
    </bean>

    <!--加载mybatis映射配置的扫描，将其作为spring的bean进行管理-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.itheima.dao"/>
    </bean>



</beans>

8、所有环境配置完成，用App.java进行测试

public class App {
    public static void main(String[] args) {
        ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
        AccountService accountService = (AccountService)ctx.getBean("accountService");
//        Account ac = accountService.findById(2);
//        System.out.println(ac);
        Account account = new Account();
        account.setName("Tom");
        account.setMoney(126546548.99);
        accountService.save(account);
    }
}

能进行增删改查功能正常使用，整合成功

spring整合mybaits

Spring