复制根据病情

我如果一个属性在Ant目标设定为复制文件中的蚂蚁一个文件，但我总是得到一个错误的代码：复制根据病情

<condition property="component.is.x"> 
    <equals arg1="${COMPONENT_ID}" arg2="x" /> 
</condition> 
<target name="copyschemaparamsfile" if="sql.file.present" > 
    <if> 
    <equals arg1="${component.is.x}" arg2="true" /> 
    <then> 
     <copy file="${in.root}/schema/${COMPONENT_ID}-schema.sql" 
      tofile="${tmp.dir}/${COMPONENT_ID}/x/schema/schema.sql" 
      failonerror="false" /> 
    </then> 
    <else> 
     <copy file="${inf.root}/schema/${COMPONENT_ID}-schema.sql" 
      tofile="${tmp.dir}/${COMPONENT_ID}/${COMPONENT_ID}/schema/schema.sql" failonerror="false" /> 
    </else> 
    </if> 
</target>

错误是：

Ant could not find the task or a class this task relies upon. 
This is common and has a number of causes; the usual 
    solutions are to read the manual pages then download and 
    install needed JAR files, or fix the build file: 
    - You have misspelt 'if'. 
     Fix: check your spelling. 
    - The task needs an external JAR file to execute 
     and this is not found at the right place in the classpath. 
     Fix: check the documentation for dependencies. 
     Fix: declare the task. 
    - The task is an Ant optional task and the JAR file and/or libraries 
     implementing the functionality were not found at the time you 
     yourself built your installation of Ant from the Ant sources. 
     Fix: Look in the ANT_HOME/lib for the 'ant-' JAR corresponding to the 
     task and make sure it contains more than merely a META-INF/MANIFEST.MF. 
     If all it contains is the manifest, then rebuild Ant with the needed 
     libraries present in ${ant.home}/lib/optional/ , or alternatively, 
     download a pre-built release version from apache.org 
    - The build file was written for a later version of Ant 
     Fix: upgrade to at least the latest release version of Ant 
    - The task is not an Ant core or optional task 
     and needs to be declared using <taskdef>. 
    - You are attempting to use a task defined using 
     <presetdef> or <macrodef> but have spelt wrong or not 
     defined it at the point of use 

    Remember that for JAR files to be visible to Ant tasks implemented 
    in ANT_HOME/lib, the files must be in the same directory or on the 
    classpath

当我执行时，我总是会遇到上述错误。有人可以建议如何检查一个参数并从一个目录复制到另一个目录内的其他目录？

来源

2014-01-08 user1885159

Ant <if/>是Ant-Contrib的一部分。要使用，请遵循Ant-Contrib Tasks installation page方向：

（1）蚂蚁的contrib-0.3.jar复制到你的Ant 安装的lib目录。如果你想使用的任务之一，在自己的项目，线

<taskdef resource="net/sf/antcontrib/antcontrib.properties"/>

添加到您的构建文件。

（2）将ant-contrib-0.3.jar保存在一个单独的位置。现在，您可以告诉Ant明确在哪里可以找到它（在/ usr/share/java目录/ lib中说）：

<taskdef resource="net/sf/antcontrib/antcontrib.properties"> 
    <classpath> 
    <pathelement location="/usr/share/java/lib/ant-contrib-0.3.jar"/> 
    </classpath> 
</taskdef>

来源

2014-01-08 12:32:52 kjhughes

您好，感谢您的答复。我做的和1）一样（1）将ant-contrib-0.3.jar复制到Ant安装的lib目录中。如果您想使用自己项目中的任务之一，请在构建文件中添加。但错误仍然是一样的。 – user1885159

未找到Ant-Contrib JAR文件。例如，你可能已经把它放在你正在调用的ant安装的'lib /'目录下。仔细检查错误消息中的每个建议以及非常全面的建议。如果所有这些都失败了，请尝试其他（2）方法。 – kjhughes

复制根据病情

回答

相关问题