Spring实战之获取其他Bean的属性值操作示例

<?xml version="1.0" encoding="GBK"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xmlns="http://www.springframework.org/schema/beans"
   xmlns:util="http://www.springframework.org/schema/util"
   xsi:schemaLocation="http://www.springframework.org/schema/beans
   http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
   http://www.springframework.org/schema/util
   http://www.springframework.org/schema/util/spring-util-4.0.xsd">
   <!--下面配置定义一个将要被引用的目标bean-->
   <bean id="person" class="org.crazyit.app.service.Person">
      <property name="age" value="30"/>
      <property name="son">
        <!-- 使用嵌套Bean定义setSon()方法的参数值 -->
        <bean class="org.crazyit.app.service.Son">
           <property name="age" value="11" />
        </bean>
      </property>
   </bean>
   <!-- 将指定Bean实例的getter方法返回值定义成son1 Bean -->
   <bean id="son1" class=
      "org.springframework.beans.factory.config.PropertyPathFactoryBean">
      <!-- 确定目标Bean，指定son1 Bean来自哪个Bean的getter方法 -->
      <property name="targetBeanName" value="person"/>
      <!-- 指定son1 Bean来自目标bean的哪个getter方法，son代表getSon() -->
      <property name="propertyPath" value="son"/>
   </bean>
   <!-- 简化配置
   <util:property-path id="son1" path="person.son"/> -->
   <!-- 下面定义son2 Bean -->
   <bean id="son2" class="org.crazyit.app.service.Son">
      <property name="age">
        <!-- 使用嵌套Bean为调用setAge()方法指定参数值 -->
        <!-- 以下是访问指定Bean的getter方法的简单方式,
        person.son.age代表获取person.getSon().getAge()-->
        <bean id="person.son.age" class=
           "org.springframework.beans.factory.config.PropertyPathFactoryBean"/>
      </property>
   </bean>
   <!-- 简化配置
   <bean id="son2" class="org.crazyit.app.service.Son">
      <property name="age">
        <util:property-path path="person.son.age"/>
      </property>
   </bean> -->
   <!-- 将基本数据类型的属性值定义成Bean实例 -->
   <bean id="theAge" class=
      "org.springframework.beans.factory.config.PropertyPathFactoryBean">
      <!-- 确定目标Bean，表明theAge Bean来自哪个Bean的getter方法的返回值 -->
      <property name="targetBeanName" value="person"/>
      <!-- 使用复合属性来指定getter方法。son.age代表getSon().getAge() -->
      <property name="propertyPath" value="son.age"/>
   </bean>
   <!-- 简化配置
   <util:property-path id="theAge" path="person.son.age"/> -->
   <!-- 将基本数据类型的属性值定义成Bean实例 -->
   <bean id="theAge2" class=
      "org.springframework.beans.factory.config.PropertyPathFactoryBean">
      <!-- 确定目标Bean，表明theAge2 Bean来自哪个Bean的属性。
        此处采用嵌套Bean定义目标Bean -->
      <property name="targetObject">
        <!-- 目标Bean不是容器中已经存在的Bean, 而是如下的嵌套Bean-->
        <bean class="org.crazyit.app.service.Person">
           <property name="age" value="30"/>
        </bean>
      </property>
      <!-- 指定theAge2 Bean来自目标bean的哪个getter方法，age代表getAge() -->
      <property name="propertyPath" value="age"/>
   </bean>
</beans>

package org.crazyit.app.service;
public class Person
{
   private int age;
   private Son son;
   // age的setter和getter方法
   public void setAge(int age)
   {
      this.age = age;
   }
   public int getAge()
   {
      return this.age;
   }
   // son的setter和getter方法
   public void setSon(Son son)
   {
      this.son = son;
   }
   public Son getSon()
   {
      return this.son;
   }
}

package org.crazyit.app.service;
public class Son
{
   private int age;
   // age的setter和getter方法
   public void setAge(int age)
   {
      this.age = age;
   }
   public int getAge()
   {
      return this.age;
   }
   public String toString()
   {
      return "Son[age=" + age + "]";
   }
}

package lee;
import org.springframework.context.*;
import org.springframework.context.support.*;
import org.crazyit.app.service.*;
public class SpringTest
{
  public static void main(String[] args)
  {
    ApplicationContext ctx = new
      ClassPathXmlApplicationContext("beans.xml");
    System.out.println("系统获取的son1："
      + ctx.getBean("son1"));
    System.out.println("系统获取son2："
      + ctx.getBean("son2"));
    System.out.println("系统获取theAge的值："
      + ctx.getBean("theAge"));
    System.out.println("系统获取theAge2的值："
      + ctx.getBean("theAge2"));
  }
}