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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