Spring(二)DI( Dependency Injection依赖注入)

1.setter注入

①:bean类:

public class DITest implements IDIBeanDAO{
    private String name;
    private int age;
    private Double fees;
    private Set<DITest> beans;
//省略getter/setter方法
}

②:xml配置:

<?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="setterBean1" class="com.gxxy.spring_04annotation.di.setter.DITest">
        <property name="name" value="LiSi"></property>
        <property name="age" value="20"></property>
        <property name="fees" value="134.2"></property>
        
    </bean>
    
    <bean  id="setterBean" class="com.gxxy.spring_04annotation.di.setter.DITest">
        <property name="name" value="ZhangSan"></property>
    <property name="age" value="18"></property> 
        <property name="fees" value="1826.3"></property>
        <property name="beans">
            <set>   SET的写法
                <ref bean="setterBean1" />   
            </set>
            <!-- <property name="beans">
            <list>   list的写法
                <ref bean=""/>
            </list>
            </property>
            
            <property name="testMap">
            <map>    map的写法
                <entry key="" value=""/>
                <entry key-ref="" value-ref="" />
            </map>
        </property> -->
        </property>
    </bean>
</beans>

2.Construct注入

①:Bean类:

public class DITest implements IDIBeanDAO{

    private String name;
    private int age;
    private Double fees;
    public DITest() {}
    public DITest(String name, int age, Double fees) {
        this.name = name;
        this.age = age;
        this.fees = fees;
    }
}
//省略gettersetter 方法    

②:xml配置:

<?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="constructBean" class="com.gxxy.spring_04annotation.di.construct.DITest">
    <!-- <constructor-arg name="name" value="ZhangSan"></constructor-arg>        
    <constructor-arg name="age" value="18"></constructor-arg>        
    <constructor-arg name="fees" value="1235.2"></constructor-arg>     -->    

    <constructor-arg index="0" value="1235.2"></constructor-arg>        
    <constructor-arg index="1" value="12"></constructor-arg>        
    <constructor-arg index="2" value="1235.2"></constructor-arg>        
        
    </bean>
</beans>