jenkins ant build的时候压缩JS/CSS代码

1、下载YUIAnt.jar 和 yuicompressor-2.4.2.jar，放到你项目的libs里。

2、build.xml增加如下配置，以我的phonegap程序为例：

<property name="www.dir" value="./assets/www" />

<path id="yuiClasspath">
<fileset dir="./libs">
<include name="yuicompressor-2.4.2.jar"/>
<include name="YUIAnt-zh_CN.jar"/>
</fileset>
</path>

<target name="compres-js-css">
<taskdef name="yuicompress" classname="com.yahoo.platform.yui.compressor.YUICompressTask">
<classpath>
<path refid="yuiClasspath"/>
</classpath>
</taskdef>
<yuicompress linebreak="500" warn="false" charset="utf-8" encoding="utf-8" munge="yes"
preserveallsemicolons="true" outputfolder="${www.dir}">
<fileset dir="${www.dir}">
<include name="scripts/url.js" />
<include name="scripts/mission.js" />
<include name="scripts/history.js" />
<include name="scripts/examination.js" />
</fileset>
</yuicompress>
</target>

3、上面增加了一个target:compress-js-css，要在 target name="-set-release-mode" 的depends里加入这个target

4、我一开始用的Ant是1.8.3版本，会报错：

java.lang.IllegalAccessError: tried to access class org.mozilla.javascript.DefaultErrorReporter from class org.mozilla.javascript.CompilerEnvirons
at org.mozilla.javascript.CompilerEnvirons.<init>(CompilerEnvirons.java:48)
at com.yahoo.platform.yui.compressor.JavaScriptCompressor.parse(JavaScriptCompressor.java:312)
at com.yahoo.platform.yui.compressor.JavaScriptCompressor.<init>(JavaScriptCompressor.java:536)
at com.yahoo.platform.yui.compressor.YUICompressTask.doCompression(YUICompressTask.java:202)
at com.yahoo.platform.yui.compressor.YUICompressTask.execute(YUICompressTask.java:101)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291)
at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
at org.apache.tools.ant.Task.perform(Task.java:348)
at org.apache.tools.ant.Target.execute(Target.java:392)
at org.apache.tools.ant.Target.performTasks(Target.java:413)
at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1399)
at org.apache.tools.ant.Project.executeTarget(Project.java:1368)
at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
at org.apache.tools.ant.Project.executeTargets(Project.java:1251)
at org.apache.tools.ant.Main.runBuild(Main.java:811)
at org.apache.tools.ant.Main.startAnt(Main.java:217)
at org.apache.tools.ant.launch.Launcher.run(Launcher.java:280)
at org.apache.tools.ant.launch.Launcher.main(Launcher.java:109)

解决：改成用1.8.1的Ant版本即可。

如果你的环境是jenkins，可以让管理员配置多一个Ant版本既可以，然后在项目的配置里，选择该版本，如下图：