依赖注入的3种方式

 

属性注入:

Car.class

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

public String getBrand() {
        return brand;
    }

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

    public int getMaxSpeed() {
        return maxSpeed;
    }

    public void setMaxSpeed(int maxSpeed) {
        this.maxSpeed = maxSpeed;
    }

    public double getPrice() {
        return price;
    }

    public void setPrice(double price) {
        this.price = price;
    }
    
    public String toString(){
        return "brand:"+brand+"/maxSpeed:"+maxSpeed+"/price:"+price;
    }

}

配置文件

<!-- 属性注入 -->
    <!--bean id="car" class="com.smart.ditype.Car">
        <property name="brand" value="红旗&amp;CA72"/>
        <property name="maxSpeed" value="200"/>
        <property name="price" value="20000.00"/>
    </bean>

测试：

public class DiTypeTest {
    public ApplicationContext factory = null;

    private static String[] CONFIG_FILES = { "com/smart/ditype/beans.xml" };

    @BeforeClass
    public void setUp() throws Exception {
        factory = new ClassPathXmlApplicationContext(CONFIG_FILES);
    }

    @Test
    public void testCar(){
        Car car = (Car)factory.getBean("car");
        assertNotNull(car);
        System.out.println(car);
    }
}

构造函数注入：

Car.class

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

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

    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;
    }
}

配置文件：

<!--构造函数注入：type -->
    <bean id="car1" class="com.smart.ditype.Car">
        <constructor-arg type="java.lang.String">
            <value>红旗CCCA72</value>
        </constructor-arg>
        <constructor-arg type="double">
            <value>10000</value>
        </constructor-arg>
    </bean>

测试：

@Test
    public void testCar1(){
        Car car1 = (Car)factory.getBean("car1");
        assertNotNull(car1);
        System.out.println(car1);
    }    

工厂注入：

CarFactory.class

public class CarFactory {
   public Car createHongQiCar(){
       Car car = new Car();
       car.setBrand("红旗CA72");
       return car;
   }
   
   public static Car createCar(){
       Car car = new Car();
       return car;
   }
}

配置文件：

<!-- 工厂方法-->
    <bean id="carFactory" class="com.smart.ditype.CarFactory" />

<bean id="car5" factory-bean="carFactory" factory-method="createHongQiCar">
</bean>
<bean id="car6" class="com.smart.ditype.CarFactory"
   factory-method="createCar"></bean>

测试：

@Test
    public void testCar5(){
        Car car5 = (Car)factory.getBean("car5");
        assertNotNull(car5);
        System.out.println("car5:"+car5);
    }

    @Test
    public void testCar6(){
        Car car6 = (Car)factory.getBean("car6");
        assertNotNull(car6);
        System.out.println("car6:"+car6);
    }