用于读取xml，解析然后按照规则来输出

<root>
    <class name="albumInfo" class="com.huawei.bean.CAlbumInfo">
        <item name="albumName" regex=" {2,}" replace=" " />
        <list name="songInfos" ref="songInfo" />
        <list name="artistInfos" ref="artistInfo" />
    </class>

    <class name="songInfo" class="com.huawei.bean.CSongInfo">
        <item name="musicName" regex=" {2,}" replace=" " />
    </class>

    <class name="artistInfo" class="com.huawei.bean.CArtistInfo">
    </class>
</root>