Spring的实例工厂方法和静态工厂方法实例代码

Spring的实例工厂方法和静态工厂方法都可以用来实例化bean，本文我们就来看看相关实例。

静态工厂方法：直接调用静态方法可以返回Bean的实例

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);
  }
} 

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

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);
  }
} 

beans-factory.xml

<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> 

Car.java实体类

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;
	}
}

Main.java

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);
	}
}

运行结果：

Car [brand=aodi, price=3000.0]
Car [brand=audi, price=1000.0]

总结

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