目录

一、注入外部Bean与内部Bean

二、简单类型注入

 三、级联属性赋值

四、注入数组

 五、List与Set注入

 六、Map和Properties注入

---

一、注入外部Bean与内部Bean

public class OrderDao {
    private static final Logger logger = LoggerFactory.getLogger(UserDao.class);
    public void insert(){
        logger.info("订单正在生成...");
    }
}

public class OrderService {
    private OrderDao orderDao;

    public void setOrderDao(OrderDao orderDao) {
        this.orderDao = orderDao;
    }

    /**
     * 生产订单的业务方法
     */
    public void save(){
        orderDao.insert();
    }
}

<?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 http://www.springframework.org/schema/beans/spring-beans.xsd">
    <!--声明Bean-->
    <bean id="orderBean" class="com.cjc.spring6.dao.OrderDao"></bean>
    <bean id="orderServiceBean" class="com.cjc.spring6.service.OrderService">
        <!--使用ref引入，这里就是实现注入外部Bean-->
        <property name="orderDao" ref="orderBean"/>
    </bean>

    <bean id="orderServiceBean1" class="com.cjc.spring6.service.OrderService">
        <property name="orderDao">
           <!--在property标签中嵌套bean标签，就是内部Bean-->
            <bean class="com.cjc.spring6.dao.OrderDao"></bean>
        </property>
    </bean>
</beans>

 @Test
    public void getOrder(){
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("spring02.xml");
        OrderService orderService = applicationContext.getBean("orderServiceBean", OrderService.class);
        orderService.save();
    }

打印结果： 

2022-11-13 23:30:38.767 [main] INFO  com.cjc.spring6.dao.UserDao - 订单正在生成...

二、简单类型注入

引入依赖

 <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.10</version>
        </dependency>

@Data
@ToString
public class User {
    private String username;
    private String password;
    private int age;
}

配置文件：

   <!--注入简单类型-->
    <bean id="userBean" class="com.cjc.spring6.bean.User">
        <!--给简单属性赋值使用value属性-->
        <property name="username" value="老王"/>
        <property name="password" value="123456"/>
        <property name="age" value="18"/>
     </bean>

测试类：

 @Test
    public void getUserType(){
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("spring02.xml");
        User user = applicationContext.getBean("userBean", User.class);
        System.out.println(user);
    }

测试结果：

 简单类型的注入应用于数据库数据源管理：

@Data
@ToString
public class MyDataSource implements DataSource {
    private String driver;
    private String url;
    private String name;
    private String password;
    @Override
    public Connection getConnection() throws SQLException {
        return null;
    }

    @Override
    public Connection getConnection(String username, String password) throws SQLException {
        return null;
    }

    @Override
    public PrintWriter getLogWriter() throws SQLException {
        return null;
    }

    @Override
    public void setLogWriter(PrintWriter out) throws SQLException {

    }

    @Override
    public void setLoginTimeout(int seconds) throws SQLException {

    }

    @Override
    public int getLoginTimeout() throws SQLException {
        return 0;
    }

    @Override
    public Logger getParentLogger() throws SQLFeatureNotSupportedException {
        return null;
    }

    @Override
    public <T> T unwrap(Class<T> iface) throws SQLException {
        return null;
    }

    @Override
    public boolean isWrapperFor(Class<?> iface) throws SQLException {
        return false;
    }
}

spring的配置文件：

<bean id="myDataSource" class="com.cjc.spring6.jdbc.MyDataSource">
        <property name="driver" value="com.mysql.cj.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://localhost:3306/spring6"/>
        <property name="name" value="root"/>
        <property name="password" value="123456"/>
    </bean>

测试代码：

@Test
    public void getData(){
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("spring02.xml");
        MyDataSource dataSource = applicationContext.getBean("myDataSource", MyDataSource.class);
        System.out.println(dataSource);
    }

测试结果：

 三、级联属性赋值

@Data
@ToString
public class Clazz {
    private String name;
}

@Data
@ToString
public class Student {
    private String name;
    private Clazz clazz;
}

spring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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
   <!--使用级联属性赋值需要注意：
       1、配置的顺序不能颠倒
       2、clazz属性必须提供getter方法-->
    <bean id="clazzBean" class="com.cjc.spring6.bean.Clazz"></bean>
    <bean id="student" class="com.cjc.spring6.bean.Student">
        <property name="name" value="小丽"/>
        <property name="clazz" ref="clazzBean"/>
        <!--级联属性赋值-->
        <property name="clazz.name" value="学期班"/>
    </bean>
</beans>

测试代码：

  @Test
    public void getStudent(){
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("spring3.xml");
        Clazz clazz = applicationContext.getBean("clazzBean", Clazz.class);
        Student student = applicationContext.getBean("student", Student.class);
        System.out.println(clazz);
        System.out.println(student);
    }

测试结果：

四、注入数组

@Data
@ToString
public class Cat {
    private String name;
}

@Data
@ToString
public class ArrayLove {
    private String[]  love;
    private Cat[] cats;
}

spring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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
    <bean id="cat" class="com.cjc.spring6.bean.Cat">
        <property name="name" value="小白"/>
    </bean>
    <bean id="love" class="com.cjc.spring6.bean.ArrayLove">
        <property name="love">
           <!--数组的属性为简单类型-->
            <array>
                <value>篮球</value>
                <value>羽毛球</value>
                <value>电影</value>
            </array>
        </property>
        <!--数组的属性为引用类型-->
        <property name="cats">
            <array>
                <ref bean="cat"/>
            </array>
        </property>
    </bean>
</beans>

测试代码：

 @Test
    public void getLove(){
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("array.xml");
        ArrayLove love = applicationContext.getBean("love", ArrayLove.class);
        System.out.println(love);
    }

测试结果：

 五、List与Set注入

@Data
@ToString
public class People {
    private List<String> skill;
    private Set<String> province;
}

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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
<bean id="people" class="com.cjc.spring6.bean.People">
    <property name="skill">
        <list>
            <value>洗衣</value>
            <value>做饭</value>
            <value>跳舞</value>
        </list>
    </property>
    <property name="province">
        <set>
            <value>四川</value>
            <value>上海</value>
        </set>
    </property>
</bean>
</beans>

测试代码：

   @Test
    public void getPeople(){
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("collection.xml");
        People people = applicationContext.getBean("people", People.class);
        System.out.println(people);
    }

People(skill=[洗衣, 做饭, 跳舞], province=[四川, 上海])

 六、Map和Properties注入

@Data
@ToString
public class MapTest {
    //注入map集合
    private Map<Integer,String> phones;
   //注入属性类
   //Properties的父类是Hashtable Hashtable实现了Map接口，本质上相当于Map集合
   //键值的类型都是String类型
   private Properties properties;
}

<?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 http://www.springframework.org/schema/beans/spring-beans.xsd">
<bean id="mapBean" class="com.cjc.spring6.bean.MapTest">
    <property name="phones">
        <map>
            <entry key="1" value="123456789"/>
            <entry key="2" value="12345678"/>
            <entry key="3" value="123456780"/>
        </map>
    </property>
    <property name="properties">
        <props>
        <prop key="name">张三</prop>
        <prop key="password">123456</prop>
    </props>
    </property>
</bean>
</beans>

    @Test
    public void getMap(){
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("maptest.xml");
        MapTest mapBean = applicationContext.getBean("mapBean", MapTest.class);
        System.out.println(mapBean);
    }

MapTest(phones={1=123456789, 2=12345678, 3=123456780}, properties={password=123456, name=张三})