我正在使用Spring的SmartFactoryBean接口来创建一个对象。此接口有一个方法isEagerInit()，根据文档说明何时初始化从此接口的getObject()方法返回的对象。此接口isPrototype()中还有另一种方法，它告诉spring容器中对象的范围。
现在，我注意到的奇怪行为是使用isEagerInit()方法。如果我从此方法返回true，我可以看到我的对象的两个实例正在创建，这与isPrototype()方法相矛盾。
示例类：
public class MyBean {
public MyBean() {
System.out.println("MyBean Instance created...");
}
public void doSomething() {
System.out.println("I am doing something...");
}
}
public class MyBeanSmartFactoryBean implements SmartFactoryBean<MyBean> {
@Override
public boolean isPrototype() {
return false;
}
@Override
public boolean isEagerInit() {
return false;
}
@Override
public MyBean getObject() throws Exception {
return new MyBean();
}
@Override
public Class<?> getObjectType() {
return MyBean.class;
}
@Override
public boolean isSingleton() {
return false;
}
}
@Component("sample")
public class Sample {
@Autowired
@Qualifier("myBeanSmartFactoryBean")
private MyBean myBean;
public void doSample() {
System.out.println("Inside Sample; calling MyBean to doSomething...");
myBean.doSomething();
}
}
Spring config：
<bean id="myBeanSmartFactoryBean" class="com.demo.MyBeanSmartFactoryBean" />
<aop:aspectj-autoproxy proxy-target-class="true" />
<context:annotation-config />
<context:component-scan base-package="com.demo" />
测试代码
public class Test {
public static void main(String[] args) {
final ApplicationContext applicationContext = new ClassPathXmlApplicationContext("classpath:spring/applicationContext.xml");
final Sample sampleOne = (Sample) applicationContext.getBean("sample");
sampleOne.doSample();
System.out.println("++++++++++++++++++++++");
final Sample sampleTwo = (Sample) applicationContext.getBean("sample");
sampleTwo.doSample();
System.out.println("++++++++++++++++++++++");
final Sample sampleThree = (Sample) applicationContext.getBean("sample");
sampleThree.doSample();
}
}
输出 - 1（当isEagerInit()返回false时）
MyBean Instance created... Inside Sample; calling MyBean to doSomething... I am doing something... ++++++++++++++++++++++ Inside Sample; calling MyBean to doSomething... I am doing something... ++++++++++++++++++++++ Inside Sample; calling MyBean to doSomething... I am doing something...
输出 - 1（当isEagerInit()返回true时）
MyBean Instance created... MyBean Instance created... Inside Sample; calling MyBean to doSomething... I am doing something... ++++++++++++++++++++++ Inside Sample; calling MyBean to doSomething... I am doing something... ++++++++++++++++++++++ Inside Sample; calling MyBean to doSomething... I am doing something...
请注意语句 MyBean Instance created ... 出现两次。
感谢有人能解释发生了什么。
谢谢，
NIRANJAN