蚂蚁子串按位置

问题描述

我需要按长度f.e从属性值中提取一个子字符串. :

I need to extract a substring from property value by length, f.e. :

<property name="prop1" value="nameBLABLABLA" />

我想要获得价值

name

是否可以不使用javascript代码?

Is it possible without using javascript code ?

推荐答案

不使用香草蚂蚁，您需要添加一些蚂蚁插件，例如
Antcontrib (最新发布的2006年！)或 Ant Flaka -表示您需要其他jar/库.
使用内置的jdk Javascript引擎，就像:

Not with vanilla ant, you would need to add some Ant addon like
Antcontrib (latest release 2006 !) or Ant Flaka - means you'll need additional jars/libraries.
With using the jdk builtin Javascript engine it's as easy as :

<project>

<!-- create a macrodef for reuse -->
<macrodef name="getsubstring">
 <attribute name="src"/>
 <attribute name="from"/>
 <attribute name="to"/>
 <attribute name="result"/>
 <sequential>
  <script language="javascript">
   project.setProperty(
    "@{result}", "@{src}".substring(@{from},@{to})
    );
  </script>
 </sequential>
</macrodef>

<property name="foo" value="nameBLABLABLA"/>

<getsubstring src="${foo}" from="0" to="4" result="foobar"/>

<echo> $${foobar} => ${foobar}</echo>

</project>

不需要其他库.
创建了一个宏定义，该宏定义通常分别适用于字符串的属性.
JavaScript引擎了解Java语言和Java，您将获得对Ant api的完全访问权限.

No additional libraries needed.
Created a macrodef that works for properties respectively for strings in general.
The JavaScript engine understands Javascript and Java and you'll get full access to Ant api.

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