Spring的實例工廠方法和靜態工廠方法實例代碼

Spring的實例工廠方法和靜態工廠方法都可以用來實例化bean，本文我們就來看看相關實例。

靜態工廠方法：直接調用靜態方法可以返回Bean的實例

package com.zhu.string.factory; import java.util.HashMap; import java.util.Map; public class StaticCarFactory { /** * 靜態工廠方法：直接調用靜態方法可以返回Bean的實例* */ 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")); } //靜態工廠方法public static Car getCar(String name){ return cars.get(name); } }

實例工廠方法。即調用工廠本身，再調用工廠的實例方法來返回bean實例

package com.zhu.string.factory; import java.util.HashMap; import java.util.Map; public class InstanceCarFactory { /** * 實例工廠方法。即調用工廠本身，再調用工廠的實例方法來返回bean實例*/ 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"> <!-- 通過靜態方法來配置bean,注意不是配置靜態工廠方法實例，而是配置bean實例--> <!-- class屬性：指向靜態方法的全類名factory-method：指向靜態方法的名字constructor-arg:如果工廠方法需要傳入參數，則使用constructor-arg來配置參數--> <bean id="car1" factory-method="getCar" > <constructor-arg value="audi"></constructor-arg> </bean> <!-- 配置工廠的實例--> <bean id="carFactory"> </bean> <bean id="car2" factory-bean="carFactory" factory-method="getCar"> <constructor-arg value="audi"></constructor-arg> </bean> </beans></span>

Car.java實體類

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);}}

運行結果：

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

總結

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