动态改变春豆 [英] dynamically change spring beans

问题描述

如何使用java spring在运行时动态更改bean的属性？
我有一个bean mainView，它应该用作属性classclass1或class2。
此决定应基于属性文件进行，其中属性withSmartcard为Y或N。

how do I dynamically change the properties of a bean at runtime using java spring? I have a bean mainView, which should use as property "class" either "class1" or "class2". This decision should be made on base of an property-file, where the property "withSmartcard" is "Y" or "N".

ApplicationContext：

ApplicationContext:

<bean id="mainView"
    class="mainView">
    <property name="angebotsClient" ref="angebotsClient" />
    <property name="class" ref="class1" />
</bean>



<bean id="class1"
    class="class1">
    <constructor-arg ref="mainView" />
</bean>

<bean id="class2"
    class="class2">
    <constructor-arg ref="mainView" />
</bean>

PropertyFile：

PropertyFile:

withSmartcard = Y

withSmartcard=Y

推荐答案

使用PropertyPlaceHolder管理属性文件..

Use a PropertyPlaceHolder to manage your properties file ..

<bean id="myPropertyPlaceHolder" 
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
  <description>The service properties file</description> 
  <property name="location" value="classpath:/some.where.MyApp.properties" /> 
  </bean>

并更改您的ref属性如下：

and change your ref attribute as follow :

<bean id="mainView"
    class="mainView">
    <property name="angebotsClient" ref="angebotsClient" />
    <property name="class" ref="${withSmartCardClassImplementation}" />
</bean>

在属性文件some.where.MyApp.properties中，添加名为 withSmartCardClassImplementation <的键/ strong>其中包含class1或class2（您选择）的值。

In your properties file some.where.MyApp.properties, add a key named withSmartCardClassImplementation which will have class1 or class2 (you choose) for value.

withSmartCardClassImplementation=class1

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