连接Spring XML配置文件中的字符串？ [英] Concatenate strings within a Spring XML configuration file?

问题描述

我在Spring配置文件中有一个String值，作为JNDI查找的结果 - 它恰好是一个路径名：

I have a String value in a Spring configuration file that comes to be as the result of a JNDI lookup -- it happens to be a path name:

< jee：jndi-lookup id =myAppHomeDirjndi-name =myAppHomeDir/>

我需要连接到这个路径的另一个字符串结束，并交给另一个Spring bean如下（这当然不工作）：

Now I need to concatenate on to the end of this path another string and hand it off to another Spring bean as follows (which of course doesn't work):

<bean id="LogPath" class="org.mystuff.initBean">
    <property name="logDirectory">
       <jee:jndi-lookup id="myAppHomeDir"
                 jndi-name="myAppHomeDir" /> + "/logs"
    </property>
</bean>

有没有一个简单的方法可以做到这一点没有我写一个实用程序类Java？ p>

Is there a simple way to do this without me having to write a utility class in Java?

推荐答案

尝试使用 Spring EL（表达式语言）。我将尝试以下（未测试）：

Try using Spring EL (expression language). I would try the following (not tested):

<jee:jndi-lookup id="myAppHomeDir" jndi-name="myAppHomeDir" />

<bean id="LogPath" class="org.mystuff.initBean">
    <property name="logDirectory" value="#{myAppHomeDir+'/logs'}"/>
</bean>

不太确定如果它可以工作。麻烦我的事情是从File（我猜）转换为字符串时，连接。所以如果前一个没有工作，我会尝试：

Not quite sure if it would work. The thing that troubles me is the cast from File (I guess) to String when concatenating. So if the previous one didn't work, I would try:

#{myAppHomeDir.canonicalPath+'/logs'}

让我们知道它是否有效。

Let us know if it works.

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