Spring 3.x企业应用开发实战(6)----BeanFactory-优快云博客

本文介绍了一个使用Spring框架的BeanFactory创建并初始化Bean的实例。通过定义一个Car类，并在beans.xml配置文件中指定其属性，最后通过BeanFactoryTest类演示了如何加载配置并获取实例。

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BeanFactory是一个类工厂，是类的通用工厂。不多说，直接进入BeanFactory的使用:

首先建一个Bean类，Car.java

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package com.techman.reflect;  
  
public class Car   
{  
    private String brand;  
    private String color;  
    private int maxSpeed;  
    public String getBrand() {  
        return brand;  
    }  
    public void setBrand(String brand) {  
        this.brand = brand;  
    }  
    public String getColor() {  
        return color;  
    }  
    public void setColor(String color) {  
        this.color = color;  
    }  
    public int getMaxSpeed() {  
        return maxSpeed;  
    }  
    public void setMaxSpeed(int maxSpeed) {  
        this.maxSpeed = maxSpeed;  
    }  
      
    public Car(){  
          
    }  
      
    public Car(String brand,String color,int maxSpeed){  
        this.brand=brand;  
        this.color=color;  
        this.maxSpeed=maxSpeed;       
    }  
      
    public void introduce()  
    {  
        System.out.println("Brand is "+brand+" Color is "+color+" Max Speed is "+maxSpeed);  
    }  
}  

配置一个beans.xml文件来指明bean的位置。

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<?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"  
    xmlns:context="http://www.springframework.org/schema/context"  
      
    xsi:schemaLocation="http://www.springframework.org/schema/beans   
                        http://www.springframework.org/schema/beans/spring-beans-3.0.xsd   
                        http://www.springframework.org/schema/context   
                        http://www.springframework.org/schema/context/spring-context-3.0.xsd">  
    <bean id="car1" class="com.techman.reflect.Car" p:brand="宝马X7" p:color="白色" p:maxSpeed="350"/>                          
</beans>  

然后在类中实现Bean的初始化和调用。

BeanFactoryTest.java

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package com.techman.resource;  
  
import org.springframework.beans.factory.BeanFactory;  
import org.springframework.beans.factory.xml.XmlBeanFactory;  
import org.springframework.core.io.Resource;  
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;  
import org.springframework.core.io.support.ResourcePatternResolver;  
  
import com.techman.reflect.Car;  
  
public class BeanFactoryTest   
{  
    public static void main(String []args)throws Throwable  
    {  
        ResourcePatternResolver resolver=new PathMatchingResourcePatternResolver();  
        Resource res=resolver.getResource("classpath:com/techman/resource/beans.xml");  
        BeanFactory bf=new XmlBeanFactory(res);  
        System.out.println("Init BeanFactory.");  
          
        Car car=bf.getBean("car1",Car.class);  
          
        car.introduce();  
          
        System.out.println("Car Bean is ready for use!");  
    }  
}  

结果为:

Init BeanFactory.
Brand is 宝马X7 Color is 白色 Max Speed is 350
Car Bean is ready for use!