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"    >     <constructor-arg value="audi"></constructor-arg>   </bean>   <!-- 配置工厂的实例 -->   <bean id="carFactory">   </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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