《Pro Spring》学习笔记之InitializingBean

SimpleBean.java

InitializingBean接口中只有一个afterPropertiesSet方法

package ch5.initMethod;

import org.springframework.beans.factory.InitializingBean;

public class SimpleBean implements InitializingBean ...{
  public void afterPropertiesSet() throws Exception ...{
        System.out.println("int afterPropertiesSet");
    }
private  String name;
  private String sex;
  private String age;
  public void init()...{
      System.out.println("this is info from constructor from SimpleBean and property is name:"+this.getName());
  }
public String getAge() ...{
    return age;
}
public void setAge(String age) ...{
    this.age = age;
}
public String getName() ...{
    return name;
}
public void setName(String name) ...{
    this.name = name;
}
public String getSex() ...{
    return sex;
}
public void setSex(String sex) ...{
    this.sex = sex;
}
}

 配置文件：

 

<?xml version="1.0" encoding="UTF-8"?>
<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-2.0.xsd">

<bean id="SimpleBean" class="ch5.initMethod.SimpleBean" init-method="init">
<property name="name">
    <value>gaoxiang</value>
  </property>
<property name="sex">
   <value>male</value>
</property>
<property name="age">
    <value>26</value>
  </property>
</bean>


</beans>

 

测试代码：

 

 

package ch5.initMethod;

import java.io.File;

import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.FileSystemResource;

public class TestSpring...{
  public static void main(String args[])  throws Exception...{
      //获取bean factory
      BeanFactory factory=(BeanFactory)getBeanFactory();  //使用子beanFactory
     
     
      SimpleBean bean1=(SimpleBean)factory.getBean("SimpleBean");
      
    
  }
  public static BeanDefinitionRegistry getBeanFactory()...{
      //获取bean factory
      String realpath="";
   
         //加载配置项
      realpath=System.getProperty("user.dir")+File.separator+"src"+File.separator+"ch5/initMethod"+File.separator+"applicationContext.xml";
  
     
      XmlBeanFactory  factory=new XmlBeanFactory(new FileSystemResource(realpath));
      
      return factory;
  }
}

 

运行结果：

this is info from afterpropertiesSet from SimpleBean and property is name:gaoxiang
this is info from constructor from SimpleBean and property is name:gaoxiang

可以看initializingBean的生命周期是设置属性之后，自定义init-method之前运行

这种方式的好处是一次就能为bean的所有实例指定初始化回调，代价是应用程序和spring耦合