beans-factory.xml
<?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">
<!-- 通過靜態工廠方法來配置bean,注意不是配置靜態工廠方法實例，而是配置bean實例 -->
<!--
class 屬性：指向靜態工廠方法的全類名
factory-method ： 指向靜態工廠方法的名字
constructor-arg ：如果工廠方法需要傳入參數，則使用constructor-arg來配置參數。
-->
<bean id="car1"
class="com.hy.spring.beans.factory.StaticCarFactory"
factory-method="getCar" >
<constructor-arg value="audi"></constructor-arg>
</bean>
<!-- 配置工廠實例 -->
<bean id="carFactory" class="com.hy.spring.beans.factory.InstanceCarFactory">
</bean>
<!-- 通過實例工廠方法來配置bean -->
<!--
class 屬性：指向實例工廠方法的bean
factory-method ： 指向靜態工廠方法的名字
constructor-arg ：如果工廠方法需要傳入參數，則使用constructor-arg來配置參數。
-->
<bean id="car2" factory-bean="carFactory" factory-method="getCar">
<constructor-arg value="ford"></constructor-arg>
</bean>
</beans>
Car.java
package com.hy.spring.beans.factory;
public class Car {
private String brand;
private double price;
public String getBrand() {
return brand;
}
public void setBrand(String brand) {
this.brand = brand;
}
public double getPrice() {
return price;
}
public void setPrice(double price) {
this.price = price;
}
@Override
public String toString() {
return "Car [brand=" + brand + ", price=" + price + "]";
}
public Car(){
System.out.println("Car's is Counstructor ....");
}
public Car(String brand, double price) {
super();
this.brand = brand;
this.price = price;
}
}
StaticCarFactory.java
package com.hy.spring.beans.factory;
import java.util.HashMap;
import java.util.Map;
/**
* 靜態工廠方法：直接調用某一個類的靜態方法就可以返回bean的實例
*/
public class StaticCarFactory {
private static Map<String,Car> cars = new HashMap<String, Car>();
static{
cars.put("audi", new Car("audi",30000));
cars.put("ford", new Car("ford",40000));
}
//靜態工廠方法。
public static Car getCar(String name){
return cars.get(name);
}
}
InstanceCarFactory.java
package com.hy.spring.beans.factory;
import java.util.HashMap;
import java.util.Map;
/**
* 實例工廠方法：實例工廠的方法，即現需要創建工廠本身，
* 在調用工廠的實例方法來返回bean的實例
*/
public class InstanceCarFactory {
private Map<String,Car> cars = null;
public InstanceCarFactory(){
cars= new HashMap<String, Car>();
cars.put("audi", new Car("audi",30000));
cars.put("ford", new Car("ford",40000));
}
public Car getCar(String brand){
return cars.get(brand);
}
}
Main.java
package com.hy.spring.beans.factory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Main {
public static void main(String[] args) {
ApplicationContext ctx = new ClassPathXmlApplicationContext("beans-factory.xml");
Car car = (Car) ctx.getBean("car1");
System.out.println(car);
car = (Car) ctx.getBean("car2");
System.out.println(car);
}
}
結果：
