1. 通過靜態方法例項化一個bean,例項化出來的bean的型別對應於靜態方法的返回型別，這地點不同於普通的bean
   (1) 靜態方法無引數：
   <bean id="thefmbean" class="springtest.FactoryMethodBean" factory-method="getInstance" />
  (2) 靜態方法有一個引數
   <bean id="thenamedfmbean" class="springtest.FactoryMethodBean" 
         factory-method="getNamedInstance">
        <constructor-arg value="China" />
  </bean>
  這裡<constructor-arg value="China" />表示為靜態方法引數的值
 (3) 對於(2)例項化出來的bean，再進行屬性set
   <bean id="thenamedfmbean" class="springtest.FactoryMethodBean" 
         factory-method="getNamedInstance">
        <constructor-arg value="China" />
        <property name="id" value="20" />
  </bean>
2. 對一個已經例項化的bean，得到其普通方法返回的物件,引數方式與1完全相同
  <bean id="duke" class="springtest.Juggler">
    <constructor-arg value="15" />
  </bean>
  <bean id="employee" factory-bean="duke" factory-method="getYourEmployee">
    <constructor-arg value="Mike" />
    <property name="id" value="18" />
  </bean>


  其中duke為以普通方式例項化出來的bean,通過factory-method得到的是Employee的一個物件
  
package springtest;


public interface Performer
{


void perform() throws PerformanceException;


}
package springtest;


public class FactoryMethodBean implements Performer
{
private String name = "Hello";
private int id;

private FactoryMethodBean()
{

}

public void setId(int id)
{
this.id = id;
}

private static class StaticFactoryMethodBean
{
static FactoryMethodBean instance = new FactoryMethodBean();
}

public static FactoryMethodBean getInstance()
{
return StaticFactoryMethodBean.instance;
}

public static FactoryMethodBean getNamedInstance(String tmpName)
{
StaticFactoryMethodBean.instance.name = tmpName;
return StaticFactoryMethodBean.instance;
}


@Override
    public void perform() throws PerformanceException
    {
   System.out.println("FactoryMethodBean.name = " + name);
    }

public String getNewName()
{
return "new name";
}
}


package springtest;


public class Juggler implements Performer
{
private int beanBags = 3;

public Juggler()
{

}

public Juggler(int beanBags)
{
this.beanBags = beanBags;
}

@Override
public void perform() throws PerformanceException
{
System.out.println("Juggling " + beanBags + " beanBags");
}

public String getMyName()
{
return "My Name";
}

public String getYourName(String yourName)
{
return "Your name is " + yourName;
}

public Employee getYourEmployee(String adName)
{
return new Employee(adName);
}
}


package springtest;


public class Employee
{
private int id;
private String name;

public Employee(String name)
{
this.name = name;
}

public Employee()
{

}

public void setId(int id)
{
this.id = id;
}

public void setName(String name)
{
this.name = name;
}

public int getId()
{
return id;
}

public String getName()
{
return name;
}
}