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 {
private static Map cars=new HashMap();
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 {
private Map cars=null;
public InstanceCarFactory() {
// TODO Auto-generated constructor stub
cars=new HashMap();
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
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 {
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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