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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