java 返回xml jquery处理

import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;

import com.autotoll.jv.erp.proxy.PortletActionBeanProxy;
import com.liferay.portal.struts.AJAXAction;
import com.liferay.portal.theme.ThemeDisplay;
import com.liferay.portal.util.WebKeys;
import com.autotoll.jv.pojo.impl.Citytable;

public class ShowCityAjax extends AJAXAction{

	public String getText(ActionMapping arg0, ActionForm arg1,
			HttpServletRequest request, HttpServletResponse response) throws Exception {
		
		ThemeDisplay themeDisplay = 
			(ThemeDisplay) request.getAttribute(WebKeys.THEME_DISPLAY);
		String language = themeDisplay.getLanguageId();
		
		String pid = request.getParameter("pid");
		String cityId = "";
		String cityName = "";
		
		Document document = DocumentHelper.createDocument();
		Element root = document.addElement("city");
		
		if (pid !=null && ! pid.trim().equals("")) {
			List<Citytable> list = 
				PortletActionBeanProxy.getInstance().
					getCityTableSvc().findCityByPId(Long.parseLong(pid));
			if (list !=null && list.size()>0) {
				for (Citytable city :list) {
					cityId = city.getCityid().toString();
					if(language.trim().equals("zh_CN")) {
						cityName = city.getCitynameSc();
					} else if(language.trim().equals("zh_TW")) {
						cityName = city.getCitynameTc();
					} else {
						cityName = city.getCitynameEng();
					}
					Element cId = root.addElement("cityId");
					Element cName = root.addElement("cityName");
					cId.addText(cityId);
					cName.addText(cityName);
				}
			}
		}
//		System.out.println(root.asXML());
		return root.asXML();
	}

jsp 页面：

function toXML(strxml){    
    try{    
        xmlDoc = new ActiveXObject("Microsoft.XMLDOM");    
        xmlDoc.loadXML(strxml);    
    } catch(e){    
        var oParser=new DOMParser();    
        xmlDoc=oParser.parseFromString(strxml,"text/xml");    
    }    
    return xmlDoc;    
}   

function getCity(obj){
	var pid = obj.options[obj.selectedIndex].value;
	if (pid != "") {
	jQuery.ajax(
		{url: '<%= themeDisplay.getPathMain() %>/erp/showCity',	
		 data: {pid:pid},	
		 success: setOptions});
	} else {
	  var selectObj = document.getElementById('city_');
	  selectObj.options.length = 0;
	  selectObj.options.add(new Option('<liferay-ui:message key="erp.select.option.choose"/>',""));
	  document.getElementById("address-alert-span").style.display = "";
	}
}

function setOptions(xml) {
	var radioValue = getRadioValue();
	var selectObj = document.getElementById('city_');
	selectObj.options.length = 0;
	var xmlobj = toXML(xml);
	var cidArr = xmlobj.getElementsByTagName('city/cityId');
	var cNameArr = xmlobj.getElementsByTagName('city/cityName');
	selectObj.options.add(new Option('<liferay-ui:message key="erp.select.option.choose"/>',""));	
	for(var i=0; i<cidArr.length; i++){
		selectObj.options.add(new Option(cNameArr[i].childNodes(0).nodeValue,cidArr[i].childNodes(0).nodeValue));	
	}
	document.getElementById('city').value=cidArr[0].childNodes(0).nodeValue;
	if (document.getElementById('city').value != "" && document.getElementById('address').value != "") {
      document.getElementById("address-alert-span").style.display = "none";
    } else {
      document.getElementById("address-alert-span").style.display = "";
    }
}