Spring的实例工厂方法和静态工厂方 Spring的实例工厂方法和静态工厂方法实例代码

package com.zhu.string.factory; 
 
import java.util.HashMap; 
import java.util.Map; 
 
public class StaticCarFactory { 
  /** 
   * 静态工厂方法：直接调用静态方法可以返回Bean的实例 
   * 
   */ 
  private static Map<String ,Car > cars=new HashMap<String , Car>(); 
  static{ 
    cars.put("audi",  new Car(3000, "aodi")); 
    cars.put("fodo",  new Car(3000, "aodi")); 
  } 
  //静态工厂方法 
  public static Car getCar(String name){    
    return cars.get(name); 
  } 
} 

package com.zhu.string.factory; 
 
import java.util.HashMap; 
import java.util.Map; 
 
public class InstanceCarFactory { 
  /** 
   * 实例工厂方法。即调用工厂本身，再调用工厂的实例方法来返回bean实例 
   */ 
  private Map<String ,Car> cars=null; 
  public InstanceCarFactory() { 
    // TODO Auto-generated constructor stub 
    cars=new HashMap<String, Car>(); 
    cars.put("audi", new Car(1000,"audi")); 
    cars.put("dffdas", new Car(2000,"audi")); 
  } 
  public Car getCar(String brand){ 
    return cars.get(brand); 
  } 
} 

<span style="font-size:14px;"><?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.xsd"> 
 
  <!-- 通过静态方法来配置bean,注意不是配置静态工厂方法实例，而是配置bean实例 
 
--> 
  <!-- 
    class属性：指向静态方法的全类名 factory-method：指向静态方法的名字 
    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="car1" factory-method="getCar" 
    class="com.zhu.string.factory.StaticCarFactory"> 
    <constructor-arg value="audi"></constructor-arg> 
  </bean> 
  <!-- 配置工厂的实例 --> 
  <bean id="carFactory" class="com.zhu.string.factory.InstanceCarFactory"> 
  </bean> 
  <bean id="car2" factory-bean="carFactory" factory-method="getCar"> 
    <constructor-arg value="audi"></constructor-arg> 
  </bean> 
</beans></span> 

package com.zhu.string.factory;
public class Car {
	private double price;
	private String brand;
	public double getPrice() {
		return price;
	}
	public void setPrice(double price) {
		this.price = price;
	}
	public String getBrand() {
		return brand;
	}
	public void setBrand(String brand) {
		this.brand = brand;
	}
	@Override 
	  public String toString() {
		return "Car [brand=" + brand + ", price=" + price + "]";
	}
	public Car(){
		System.out.println("cars....constructor");
	}
	public Car(double price, String brand) {
		super();
		this.price = price;
		this.brand = brand;
	}
}

package com.zhu.string.factory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Main {
	/** 
   * @param args 
   */
	public static void main(String[] args) {
		// TODO Auto-generated method stub 
		ApplicationContext cx=new ClassPathXmlApplicationContext("beans- 
factory.xml");
		Car car1=(Car) cx.getBean("car1");
		System.out.println(car1);
		Car car2=(Car) cx.getBean("car2");
		System.out.println(car2);
	}
}