Spring之屬性注入

一、構造方法的方式的屬性注入

public class Student {
    public String name;
    public Integer age;

    public Student(String name, Integer age){
        this.name = name;
        this.age = age;
    }
}
           

<bean id="student" class="pers.liuchengyin.demo4.Student">
        <constructor-arg name="name" value="柳成蔭"/>
        <constructor-arg name="age" value="16"/>
</bean>
           

 二、Set方法的普通類型屬性注入

public class Student {
    public String name;
    public Integer age;

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

    public void setAge(Integer age) {
        this.age = age;
    }
}
           

<bean id="student" class="pers.liuchengyin.demo4.Student">
        <property name="name" value="柳成蔭"></property>
        <property name="age" value="10"></property>
</bean>
           

三、Set方法設定對象類型屬性注入

public class Student {
    public String name;
    public Integer age;
    public Dog dog;


    public Student(String name, Integer age){
        this.name = name;
        this.age = age;
    }

    public void setDog(Dog dog) {
        this.dog = dog;
    }
}
           

<bean id="dog" class="pers.liuchengyin.demo4.Dog">
     <property name="name" value="金毛"></property>
</bean>

<bean id="student" class="pers.liuchengyin.demo4.Student">
     <constructor-arg name="name" value="柳成蔭"/>
     <constructor-arg name="age" value="16"/>
     <!-- 對象是通過ref的方式 -->
     <property name="dog" ref="dog"></property>
</bean>
           

 四、P名稱空間的屬性注入

<!-- 使用前，先添加名稱空間 -->
xmlns:p="http://www.springframework.org/schema/p"
           

<!-- 使用p名稱空間，就不需要寫那那麼多的property -->
<bean id="dog" class="pers.liuchengyin.demo4.Dog" p:age="3" p:color="黃色" p:name="金毛">
</bean>

<bean id="student" class="pers.liuchengyin.demo4.Student" p:dog-ref="dog">
    <constructor-arg name="name" value="柳成蔭"/>
    <constructor-arg name="age" value="16"/>
    <property name="dog" ref="dog"></property>
</bean>
           

五、spEL表達式的屬性注入

<bean id="dog2" class="pers.liuchengyin.demo4.Dog" >
    <property name="name" value="#{'哈士奇'}"/>
    <property name="age" value="#{10}"/>
    <property name="color" value="#{'黑白'}"/>
</bean>

<bean id="student" class="pers.liuchengyin.demo4.Student">
    <constructor-arg name="name" value="柳成蔭"/>
    <constructor-arg name="age" value="16"/>
    <property name="dog" value="#{dog2}"/>
    <property name="dogName" value="#{dog2.name}"/>
</bean>
           

六、集合類型屬性注入

①數組

<!-- attr是數組名 -->
<property name="attr">
    <list>
        <value>aaa</value>
        <value>bbb</value>
        <value>ccc</value>
    </list>
</property>	
           

②List集合

<!-- list是集合名 -->
<property name="list">
    <list>
        <value>123</value>
        <value>456</value>
        <value>789</value>
    </list>
</property>	
           

 ③Set集合

<property name="set">
    <set>
        <value>123</value>
        <value>456</value>
        <value>789</value>
    </set>
</property>
           

 ④Map集合

<property name="map">
    <map>
        <entry key="key1" value="value1"></entry>
        <entry key="key2" value="value2"></entry>
        <entry key="key3" value="value3"></entry>
    </map>
</property>