xml 读取
<?xml version="1.0"?>
<response>
<category>productname</category>
<action>Check</action>
<code>1000</code>
<msg>Command complateted successfully</msg>
<value>no value</value>
<resData>
<data name="contactid">test</data>
...
<data name="avail">1</data>
</resData>
<trid>150132A1239162894B891</cltrid>
<svtrid>150132A1239162894B891-API-SRV</svtrid>
<chksum>f959d5fce7557051dffd9eaf5d595c69</chksum>
</response>
如何读取各节点值、属性及其值?