Ⅸ.spring的点点滴滴--IObjectFactory与IFactoryObject的杂谈

承接上文

ObjectFactory与IFactoryObject的杂谈

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.net篇（环境为vs2012+Spring.Core.dll v1.31）

    public class parent    {
        public string Name { get; set; }
        public int Age { get; set; }
    }
    public class CustomFactory :
    Spring.Objects.Factory.IFactoryObject
    {
        public object GetObject(){
            return "1";
        }
        public bool IsSingleton{
            get { return false; }
        }
        public Type ObjectType{
            get { return typeof(string); }
        }
    }

  <object id="p1" type="SpringBase.parent,SpringBase">
    <property name="Name" value="cnljli" />
    <property name="Age" value="1"/>
  </object>
  <object id="p2" type="SpringBase.parent,SpringBase" singleton="false" >
    <property name="Name" value="cnljli" />
    <property name="Age" value="1"/>
  </object>
  <object id="customFac" type="SpringBase.CustomFactory, SpringBase"/>

1. 可以直接调用xml配置文件来返回一个工厂

    Spring.Core.IO.IResource input = new Spring.Core.IO.FileSystemResource("factory.xml");
            Spring.Objects.Factory.Xml.XmlObjectFactory factory =
            new Spring.Objects.Factory.Xml.XmlObjectFactory(input);

2. 可以通过xml文件里面的配置为程序的实例注入, 第一个参数为实例的引用地址,第二个参数为xml文件的id

    parent ioc = new parent();
    factory.ConfigureObject(ioc, "p1");

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java篇（环境为Maven+Jdk1.7+IntelliJ IDEA 12.1.4）

package springdemo;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.*;
public class Parent {
    private String name;
    private Integer age;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public Integer getAge() {
        return age;
    }
    public void setAge(Integer age) {
        this.age = age;
    }
}
class  CustomFactory implements FactoryBean<String>{
    @Override
    public String getObject() throws Exception {
        return "1";
    }
    @Override
    public Class<?> getObjectType() {
        return String.class;
    }
    @Override
    public boolean isSingleton() {
        return false;
    }
}

    <bean id="p1" class="springdemo.Parent">
        <property name="name" value="cnljli-p1" />
        <property name="age" value="1" />
    </bean>
    <bean id="p2" class="springdemo.Parent" singleton="false">
        <property name="name" value="cnljli-p2" />
        <property name="age" value="1" />
    </bean>
    <bean id="customFac" class="springdemo.CustomFactory" />

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java和Csharp的共同点

1. 如果没有显式指定，对象的布署模式默认为singleton,即当修改一个实例化,再次通过id获取, 为修改后的实例
2. 实现IFactoryObject|FactoryBean接口的对象也可以获取这个工厂 不一定是这个工厂创建的实例,通过在id前面加上&符号

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