Spring(21) 获取其他类成员变量的值

1. 可以在配置文件中通过将class指定为PropertyPathFactory，然后就可以通过指定targetClass配合targetField来将别人的成员变量拿过来用啦~~

   <?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.xsd">
   
       <!--将class指定为FieldRetrievingFactoryBean，然后再指定 targetClass和targetField，就ok-->
       <bean id="theAge1" class="org.springframework.beans.factory.config.FieldRetrievingFactoryBean ">
           <property name="targetClass" value="java.sql.Connection"/>
           <property name="targetField" value="TRANSACTION_READ_UNCOMMITTED"/>
       </bean>
   
   <!--这是简写，如果这里是实例变量那么staticField就要改啦-->
       <bean id="theAge2" class="org.springframework.beans.factory.config.FieldRetrievingFactoryBean ">
           <property name="staticField" value="java.sql.Connection.TRANSACTION_NONE"/>
       </bean>
   
       <!--一种比较高级的写法-->
       <bean id="test" class="InstancePackage.Test">
           <property name="show">
               <!--<bean id="java.sql.Connection.TRANSACTION_NONE"-->
                     <!--class="org.springframework.beans.factory.config.FieldRetrievingFactoryBean"/>-->
               <util:constant static-field="java.sql.Connection.TRANSACTION_NONE"/>
           </property>
       </bean>
   
   </beans>

   package InstancePackage;
   
   public class Test {
       private int show;
   
       public int getShow() {
           return show;
       }
   
       public void setShow(int show) {
           this.show = show;
       }
   }
   

   package TestPackage;
   
   import InstancePackage.Test;
   import org.springframework.context.ApplicationContext;
   import org.springframework.context.support.ClassPathXmlApplicationContext;
   
   public class SpringTest {
       public static void main(String []args){
           ApplicationContext applicationContext = new ClassPathXmlApplicationContext("beans.xml");
           System.out.println( applicationContext.getBean("theAge1",Integer.class));
           System.out.println( applicationContext.getBean("theAge2",Integer.class));
           System.out.println( applicationContext.getBean("test", Test.class).getShow());
       }
   }
   

   这是我看李刚编著的《轻量级javaEE企业应用实战（第五版）-Struts2+Spring5+Hibernate5/JAP2》后总结出来的。