IOC

IOC(Inversion of Control)：其思想是反转资源获取的方向. 传统的资源查找方式要求组件向容器发起请求查找资源. 作为回应, 容器适时的返回资源. 而应用了 IOC 之后, 则是容器主动地将资源推送给它所管理的组件, 组件所要做的仅是选择一种合适的方式来接受资源. 这种行为也被称为查找的被动形式

DI

DI(Dependency Injection) — IOC 的另一种表述方式：即组件以一些预先定义好的方式(例如: setter 方法)接受来自如容器的资源注入. 相对于 IOC 而言，这种表述更直接

总结

IOC Inversion of Control,注意是名词Control，本来控制是顺着来的，要什么搞什么，但是Inverse之后，就可以把控制扭转过来，意思就是那样...

一、Bean<----配置文件的配置方法（两种）

1、利用属性名赋值

<bean id="helloWorld" class="top.biglin.HelloWorld">
        <property name="name" value="Spring"></property>
    </bean>

public class HelloWorld {
    private String name;

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

    public void hello(){
        System.out.println("Hello " + name);
    }
}

2、利用构造器赋值

<bean id="car" class="top.biglin.Car">
        <constructor-arg value="Audi"></constructor-arg>
        <constructor-arg value="ShangHai"></constructor-arg>
        <constructor-arg value="300000"></constructor-arg>
</bean>

package top.biglin;

public class Car {
    private String brand;
    private String corp;
    private double price;
    private int maxSpeed;

    public Car(String brand, String corp, double price) {
        this.brand = brand;
        this.corp = corp;
        this.price = price;
    }

    public Car(String brand, String corp, int maxSpeed) {
        this.brand = brand;
        this.corp = corp;
        this.maxSpeed = maxSpeed;
    }

    @Override
    public String toString() {
        return "Car{" +
                "brand='" + brand + '\'' +
                ", corp='" + corp + '\'' +
                ", price=" + price +
                ", maxSpeed=" + maxSpeed +
                '}';
    }
}

二、引用其他bean的方法（两种）

使用ref

 <!-- Use 'ref' refrence the other javabeans -->
    <bean id="person" class="top.biglin.Person">
        <property name="name" value="Tome" ></property>
        <property name="age" value="24"></property>
        <property name="car" ref="car2"></property>
    </bean>

使用内部bean

 <bean id="car2" class="top.biglin.Car">
        <constructor-arg value="Baoma" type="java.lang.String"></constructor-arg>
        <constructor-arg value="ShangHai" type="java.lang.String"></constructor-arg>
        <constructor-arg value="240" type="int"></constructor-arg>
    </bean>

<bean id="person2" class="top.biglin.Person">
        <property name="name" value="Tom" ></property>
        <property name="age" value="24"></property>
        <property name="car" >
            <bean class="top.biglin.Car">
                <constructor-arg value="Benz"></constructor-arg>
                <constructor-arg value="ShangHai"></constructor-arg>
                <constructor-arg value="250" type="int"></constructor-arg>
            </bean>
        </property>
    </bean>

三、特殊字符如何处理

<!--特殊字符用<![CDATA[ special Strings ]]>-->
    <bean id="car3" class="top.biglin.Car">
        <constructor-arg type="java.lang.String">
            <value><![CDATA[<!hh]]></value>
        </constructor-arg>
        <constructor-arg value="ShangHai" type="java.lang.String"></constructor-arg>
        <constructor-arg value="240" type="int"></constructor-arg>
    </bean>

注意：内部bean无法获取并使用

给元素赋null值<null></null>或<null />

<bean id="person3" class="top.biglin.Person">
        <property name="name" value="Tom" ></property>
        <property name="age" value="24"></property>
        <property name="car" >
            <null></null>
        </property>
    </bean>

四、级联赋值

  <!-- Use the Constructor 赋值,not point the type ,that will leads the error when you have two or more beans of same class -->
    <bean id="car" class="top.biglin.Car">
        <constructor-arg value="Audi"></constructor-arg>
        <constructor-arg value="ShangHai"></constructor-arg>
        <constructor-arg value="300000"></constructor-arg>
    </bean>
 <bean id="person4" class="top.biglin.Person">
        <property name="name" value="Tom" ></property>
        <property name="age" value="24"></property>
        <property name="car" ref="car"></property>
        <!--Car 类要有setter and getter-->
        <property name="car.maxSpeed" value="300"></property>
    </bean>

注意：级联属性赋值要在bean先初始化以后才可以

五、集合赋值

 <!--配置集合属性-->

    <bean id="person6" class="top.biglin.collection.Person">
        <property name="name" value="Bob"></property>
        <property name="age" value="18"></property>
        <property name="car">
            <list>
                <ref bean="car"/>
                <ref bean="car2"/>
                <ref bean="car3"/>
            </list>
        </property>

    </bean>

<set>和<map>与<list>类似

使用Map节点(<entry></entry>)

 <!--配置Map属性值-->
    <bean id="newPerson" class="top.biglin.collection.NewPerson">
        <property name="age" value="88"></property>
        <property name="name" value="linjiawei"></property>
        <property name="car">
            <map>
                <entry key="AA" value-ref="car11"></entry>
                <entry key="BB" value-ref="car12"></entry>
                <entry key="CC" value-ref="car13"></entry>
            </map>
        </property>
    </bean>

配置Properties,Properties是Map的一个实现类

 <!-- 配置Properties-->
    <bean id="dataSource" class="top.biglin.collection.DataSource">
        <property name="properties">
            <props>
                <prop key="username">root</prop>
                <prop key="password">123456</prop>
                <prop key="jdbcUrl">jdbc:mysql://test</prop>
                <prop key="driverClass">com.mysql.jdbc.Driver</prop>
            </props>
        </property>

    </bean>

配置 Configure 独立的集合bean

  <!-- 配置独立的集合bean，Make it could be quote for other beans
         ,this required to import the util name spacing
    -->
    <util:list id="cars2">
        <ref bean="car11" />
        <ref bean="car12" />
    </util:list>

    <bean id="person5" class="top.biglin.collection.Person">
        <property name="name" value="Jack"></property>
        <property name="age" value="88"/>
        <property name="car" ref="cars2"></property>
    </bean>

六 使用p命名空间(在beans中导入 xmlns:p="http://www.springframework.org/schema/p"）

    <!-- Use p name space 使用p命名空间-->
    <bean id="person7" class="top.biglin.collection.Person"
        p:age="53" p:name="person7" p:car-ref="cars2"
    ></bean>