在 PropertyPlaceholderConfigurer 实例中使用 <jee:jndi-lookup 字符串

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在 PropertyPlaceholderConfigurer 实例中使用

发布于 2024-12-20 09:10:11 字数 886 浏览 4 评论 0 原文

环境：Windows server 2003、Spring 3.0、Tomcat 6

如何在 PropertyPlaceholderConfigurer 中引用 JNDI 属性？

具体来说，我使用 JNDI 来查找表示路径的 java.lang.String 我的网络应用程序所需的属性文件

<jee:jndi-lookup id="mypropsfile1" jndi-name="myPropsFile1" resource-ref="true"/>
<jee:jndi-lookup id="mypropsfile2" jndi-name="myPropsFile2" resource-ref="true"/>

<bean id="propertyConfigurer" 
    class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
  <property name="ignoreUnresolvablePlaceholders" value="true"/>
  <property name="locations">
    <array>
        <value>how to use mypropsfile1 here ??</value>
        <value>how to use mypropsfile2 here ??</value>
    </array>
  </property>
</bean>

我的“jee:jndi-lookup”正在工作 AFAIK。我的问题似乎是如何引用 JNDI 资源在标签对内

提前致谢！标记

原文

Environment: Windows server 2003, Spring 3.0, Tomcat 6

How can I reference a JNDI property inside a PropertyPlaceholderConfigurer?

Specifically, I'm using JNDI to look up a java.lang.String that represents a path to
a property file needed by my webapp

<jee:jndi-lookup id="mypropsfile1" jndi-name="myPropsFile1" resource-ref="true"/>
<jee:jndi-lookup id="mypropsfile2" jndi-name="myPropsFile2" resource-ref="true"/>

<bean id="propertyConfigurer" 
    class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
  <property name="ignoreUnresolvablePlaceholders" value="true"/>
  <property name="locations">
    <array>
        <value>how to use mypropsfile1 here ??</value>
        <value>how to use mypropsfile2 here ??</value>
    </array>
  </property>
</bean>

My "jee:jndi-lookup"s are working AFAIK. My problem seems to be how to reference JNDI resources
inside the tag pair

Thanks in advance!
Mark

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蛮可爱 2024-12-27 09:10:11

你的方法可能不起作用，马克，这是因为 PropertyPlaceHolderConfigurer 是一个 BeanFactoryPostProcessor，并且在创建 bean 定义时被调用，而 jndi 查找发生在这个阶段之后。

我看到一个旧版 Spring 论坛讨论项，其中有关于使用基于 jndi 查找的属性文件的方法的建议，这可能适合您的需求：

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最单纯的乌龟 2024-12-27 09:10:11

我相信你将不得不做这样的事情。我还没有测试过它，但基本上 PropertyPlaceholderConfigurer 中的 setLocations 方法接受一个 Resource 数组（在我们的例子中 UrlResource - http://static.springsource.org/spring/docs/2.0.x/api/org/springframework/core/io/UrlResource.html），它又具有一个构造函数文件路径。

<jee:jndi-lookup id="mypropsfile1" jndi-name="myPropsFile1" default-value="file:///C:/defaultPath" resource-ref="true"/>
<jee:jndi-lookup id="mypropsfile2" jndi-name="myPropsFile2" resource-ref="true"/>

<bean id="propertyConfigurer" 
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer" depends-on="mypropsfile1,mypropsfile2">
  <property name="ignoreUnresolvablePlaceholders" value="true"/>
  <property name="locations">
        <list>
           <bean class="org.springframework.core.io.UrlResource">
               <constructor-arg><ref bean="mypropsfile1"/></constructor-arg>
           </bean>
           <bean class="org.springframework.core.io.UrlResource">
               <constructor-arg><ref bean="myPropsFile2"/></constructor-arg>
           </bean>
        </list>

  </property>
</bean>

我不确定是否有一个名为 in spring 的标签。检查这个 http:// /static.springsource.org/spring/docs/3.0.x/spring-framework-reference/html/beans.html#beans-introduction

I believe you will have to do something like this . I haven't tested it but basically the setLocations method in PropertyPlaceholderConfigurer takes in an array of Resource(In our case UrlResource - http://static.springsource.org/spring/docs/2.0.x/api/org/springframework/core/io/UrlResource.html) which in turn has a constructor with the file path .

<jee:jndi-lookup id="mypropsfile1" jndi-name="myPropsFile1" default-value="file:///C:/defaultPath" resource-ref="true"/>
<jee:jndi-lookup id="mypropsfile2" jndi-name="myPropsFile2" resource-ref="true"/>

<bean id="propertyConfigurer" 
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer" depends-on="mypropsfile1,mypropsfile2">
  <property name="ignoreUnresolvablePlaceholders" value="true"/>
  <property name="locations">
        <list>
           <bean class="org.springframework.core.io.UrlResource">
               <constructor-arg><ref bean="mypropsfile1"/></constructor-arg>
           </bean>
           <bean class="org.springframework.core.io.UrlResource">
               <constructor-arg><ref bean="myPropsFile2"/></constructor-arg>
           </bean>
        </list>

  </property>
</bean>

I am not sure if there is a tag called in spring . Check this http://static.springsource.org/spring/docs/3.0.x/spring-framework-reference/html/beans.html#beans-introduction

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南笙 2024-12-27 09:10:11

我在 Spring 3 中使用地图执行此操作，如下所示：

<jee:jndi-lookup id="myJndiLookup" jndi-name="com.techtrip.spring.config.myJndiLookup"></jee:jndi-lookup>       

<bean id="somethingWithMap" class="com.techtrip.foo.SomethingWithMap">
    <property name="propMap">
        <map>
            <entry key="myJndiLookup" value-ref="myJndiLookup" />
        </map>
    </property>
</bean>

这在大多数情况下工作正常。如果您使用 AOP 或将 bean 包装在 Proxy 类中的东西，即使您正确设置 eager init，您也可能会遇到麻烦。这种情况下的解决方案是在需要时直接从应用程序上下文访问 SomethingWithMap bean：

applicationContext.getBeansOfType(type, includeNonSingletons, allowedEagerInit);

*请注意，这将返回一个 Map< String, T>，您可以在其中按名称访问 bean。

I do this in Spring 3 using a map as follows:

<jee:jndi-lookup id="myJndiLookup" jndi-name="com.techtrip.spring.config.myJndiLookup"></jee:jndi-lookup>       

<bean id="somethingWithMap" class="com.techtrip.foo.SomethingWithMap">
    <property name="propMap">
        <map>
            <entry key="myJndiLookup" value-ref="myJndiLookup" />
        </map>
    </property>
</bean>

This works fine in most cases. You may run into trouble if you use AOP or something that wraps the bean in a Proxy class even if you set eager init correctly. A solution in that case is to directly access the somethingWithMap bean from the app context when needed using:

applicationContext.getBeansOfType(type, includeNonSingletons, allowEagerInit);

*Note that this will return a Map<String, T> where you can access the bean by name.

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粉红×色少女 2024-12-27 09:10:11

不完全是针对单个 JNDI 属性，而是使用通过 JNDI 获取的属性引用：

<!-- Lookup Properties reference through JNDI -->
<jee:jndi-lookup id="config-properties" jndi-name="resources/resource-name" resource-ref="true"/>

<bean id="propertyConfigurer" 
      class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer" depends-on="config-properties">
    <property name="ignoreUnresolvablePlaceholders" value="true"/>
    <!-- Once the reference is obtained from JNDI, it can be used like any other reference -->
    <property name="properties" ref="config-properties"></property>
</bean>

Not exactly for a single JNDI property, this is using a Properties reference instead, obtained through JNDI:

<!-- Lookup Properties reference through JNDI -->
<jee:jndi-lookup id="config-properties" jndi-name="resources/resource-name" resource-ref="true"/>

<bean id="propertyConfigurer" 
      class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer" depends-on="config-properties">
    <property name="ignoreUnresolvablePlaceholders" value="true"/>
    <!-- Once the reference is obtained from JNDI, it can be used like any other reference -->
    <property name="properties" ref="config-properties"></property>
</bean>

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