通过MethodInvokingFactoryBean工厂Bean,可将目标方法的返回值注入为Bean的属性值。这个工厂Bean用来获取指定 方法的返回值,该方法既可以是静态方法,也可以是实例方法;这个值既可以被注入到指定Bean实例的指定属性,也可以直接定义成Bean实例
public class Person { //儿子,该属性是son类的一个实例 private Son son; private String age; public Son getSon() { return son; } public void setSon(Son son) { this.son = son; } public String getAge() { return age; } public void setAge(String age) { this.age = age; } }
public class Son { private String age; public String getAge() { return age; } public void setAge(String age) { this.age = age; } }
public class ValueGenerator { public String getValue(){ return "2"; } public static String getStaticValue(){ return "9"; } }
<bean id="valueGenerator" class="application.ValueGenerator"></bean> <!-- 注入方法的返回值 --> <bean id="son3" class="application.Son"> <property name="age"> <bean class="org.springframework.beans.factory.config.MethodInvokingFactoryBean"> <property name="targetObject" ref="valueGenerator"> </property> <property name="targetMethod"> <value>getValue</value> </property> </bean> </property> </bean>
public static void main(String[] args) { ApplicationContext context=new ClassPathXmlApplicationContext("config/applicationContext.xml"); Son son3=(Son)context.getBean("son3"); System.out.println(son3.getAge()); } 结果:2