用动态action.
<form action="Action路径!方法名" method="post" >
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配置文件struts.xml.
<action name="findCityByProvinceAction" class="province_city.ProvinceCityAction" method="findCityByProvince">
<result name="ok" type="json">
</result>
</action>
jsp页面.
var url="${pageContext.request.contextPath}/findCityByProvinceAction"