Ajax返回list,Struts2配制
    <mw:action id="getSoftwareBundleMetadata" class="com.huawei.hae.ui.topology.action.NodeTemplateAction"
			method-name="getSoftwareBundleMetadata">
			<mw:property name="nodeTemplateService" ref="hae_ui_nodeTemplateService" />
			<mw:result id="success" type="json">
				<mw:param name="root">metadata</mw:param>
			</mw:result>
		</mw:action>