1、静态工厂方法：
bean
package com.spring.factory;
public class Car {
public Car(String brand) {
this.brand = brand;
}
@Override
public String toString() {
return "Car [brand=" + brand + "]";
}
private String brand;
public void setBrand(String brand){
System.out.println("setBrand...");
this.brand = brand;
}
public void init(){
System.out.println("init...");
}
public void destroy(){
System.out.println("destroy...");
}
}
2、静态工厂类
package com.spring.factory; import java.util.HashMap;
import java.util.Map; /*
* 静态工厂：直接调用某一个类的静态方法返回bean的实例
*/
public class staticCarFactory { private static Map<String, Car> cars = new HashMap<String, Car>(); static{
cars.put("audi", new Car("audi"));
cars.put("nission", new Car("nission"));
} //在不创建类的对象的条件下，通过静态方法返回对应的实例
public static Car getCar(String name){
return cars.get(name);
}
}
3、main方法
package com.spring.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("bean-factory.xml");
Car car = (Car)ctx.getBean("factory");
System.out.println(car);
}
}
4、配置bean-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"
xmlns:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd"> <!-- class 属性 指向静态方法的全类名
factory-method 指向静态方法
constructor-arg 如果工厂方法需要传入参数，则使用constructor-arg 来配置参数
-->
<bean id="factory" class="com.spring.factory.staticCarFactory"
factory-method="getCar">
<constructor-arg value="nission"></constructor-arg>
</bean>
</beans>
工厂方法：
package com.spring.factory; import java.util.HashMap;
import java.util.Map; public class instanceCarFactory { private Map<String, Car> cars = new HashMap<String, Car>(); public instanceCarFactory() {
cars = new HashMap<String, Car>();
cars.put("audi", new Car("audi"));
cars.put("ford", new Car("ford"));
} public Car getCar(String name){
return cars.get(name);
}
}
xml
<!-- 配置工厂的实例 -->
<bean id="instanceFactory" class="com.spring.factory.instanceCarFactory"></bean>
<!-- -->
<bean id="car2" factory-bean="instanceFactory" factory-method="getCar">
<constructor-arg value="ford"></constructor-arg>
</bean>
public static void main(String[] args) {
ApplicationContext ctx = new ClassPathXmlApplicationContext("bean-factory.xml");
Car car = (Car)ctx.getBean("car2");
System.out.println(car);
}