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Set注入自定义类型
=================

1 自己定义的类

/src/main/java/cn/tedu/injection/Car.java：

public class Car {
    private String brand;
    private String model;

    public String getBrand() {
        return brand;
    }

    public void setBrand(String brand) {
        this.brand = brand;
    }

    public String getModel() {
        return model;
    }

    public void setModel(String model) {
        this.model = model;
    }

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

2 类类型的属性

/src/main/java/cn/tedu/injection/Employee.java：

public class Employee {
    ...
    private Car car;
    ...
}

3 Bean中Bean

/src/main/resources/applicationContext.xml：

<bean id="employee" class="cn.tedu.injection.Employee">
    ...
    <property name="car">
        <bean class="cn.tedu.injection.Car">
            <property name="brand">
                <value>BMW</value>
            </property>
            <property name="model">
                <value>X4</value>
            </property>
        </bean>
    </property>
    ...
</bean>

例程：Injection

4 Bean引Bean

/src/main/resources/applicationContext.xml：

<bean id="car" class="cn.tedu.injection.Car"> <---------
    <property name="brand">                             |
        <value>BMW</value>                              |
    </property>                                         |
    <property name="model">                             |
        <value>X4</value>                               |
    </property>                                       引用
</bean>                                                 |
...                                                     |
<bean id="employee" class="cn.tedu.injection.Employee"> |
    ...                                                 |
    <property name="car">                               |
        <ref bean="car"/> ------------------------------
    </property>
    ...
</bean>

例程：Injection

Spring的早期版本使用<ref local="car"/>的写法。从Spring 4.x开始废除了该写法。