Spring使用@Required注解依赖检查

@Required示例

package com.yiibai.common;

import org.springframework.beans.factory.annotation.Required;

public class Customer 
{
	private Person person;
	private int type;
	private String action;
	
	public Person getPerson() {
		return person;
	}
	@Required
	public void setPerson(Person person) {
		this.person = person;
	}
}

1. 包函 <context:annotation-config />

<beans 
	...
	xmlns:context="http://www.springframework.org/schema/context"
	...
	http://www.springframework.org/schema/context
	http://www.springframework.org/schema/context/spring-context-2.5.xsd">
	...
	<context:annotation-config />
	...
</beans>

完整的实例,

<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:context="http://www.springframework.org/schema/context"
	xsi:schemaLocation="http://www.springframework.org/schema/beans
	http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
	http://www.springframework.org/schema/context
	http://www.springframework.org/schema/context/spring-context-2.5.xsd">

	<context:annotation-config />

	<bean id="CustomerBean" class="com.yiibai.common.Customer">
		<property name="action" value="buy" />
		<property name="type" value="1" />
	</bean>

	<bean id="PersonBean" class="com.yiibai.common.Person">
		<property name="name" value="yiibai" />
		<property name="address" value="address ABC" />
		<property name="age" value="29" />
	</bean>
	
</beans>

2. 包函 RequiredAnnotationBeanPostProcessor

<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.springframework.org/schema/beans
	http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">
<bean 
class="org.springframework.beans.factory.annotation.RequiredAnnotationBeanPostProcessor"/>
	
	<bean id="CustomerBean" class="com.yiibai.common.Customer">
		<property name="action" value="buy" />
		<property name="type" value="1" />
	</bean>

	<bean id="PersonBean" class="com.yiibai.common.Person">
		<property name="name" value="yiibai" />
		<property name="address" value="address ABC" />
		<property name="age" value="29" />
	</bean>	
</beans>

org.springframework.beans.factory.BeanInitializationException: 
	Property ‘person‘ is required for bean ‘CustomerBean‘