ajaxtag实现级联下拉框的例子

    package com.work.ganjian;

    import java.util.List;

    import javax.servlet.http.HttpServletRequest;

    import javax.servlet.http.HttpServletResponse;

    import org.ajaxtags.servlets.BaseAjaxServlet;

    import org.ajaxtags.xml.AjaxXmlBuilder;

    import org.apache.commons.logging.Log;

    import org.apache.commons.logging.LogFactory;

    import com.work.core.spring.MyBeanUtil;

    import com.work.ganjian.model.Xjjgzylb;

    import com.work.ganjian.xjjgzylb.XjjgzylbServiceDao;

 

    /**

     * 级联下拉框，根据企业的id来查找下面对应的茧站的信息。

     *

     * @author wangmingjie

     *

     */

    public class GetJianZhanServlet extends BaseAjaxServlet {

 

        /**

         *

         */

        private static final long serialVersionUID = -8720069517080929174L;

        private static Log log = LogFactory.getLog(GetJianZhanServlet.class);

 

        /*

         * (non-doc)

         *

         * @see org.ajaxtags.servlets.BaseAjaxServlet#getXmlContent(javax.servlet.http.HttpServletRequest,

         *      javax.servlet.http.HttpServletResponse)

         */

        public String getXmlContent(HttpServletRequest request,

                HttpServletResponse response) throws Exception {

 

            String xjqyid = request.getParameter("xjqyid"); // 首先获取参数

 

            String emptyFlag = request.getParameter("emptyFlag"); // 是否有空选项

            boolean flag = false;

            if (emptyFlag == null || emptyFlag.trim().equals("")) {

                flag = false;

            } else if (emptyFlag.trim().equals("true")) {

                flag = true;

            } else {

                flag = false;

            }

            AjaxXmlBuilder xml = new AjaxXmlBuilder();

            if (flag)

                xml.addItem("请选择", "");

            if (xjqyid == null || "".equals(xjqyid.trim())) {

                return xml.toString();// 返回xml

            }

 

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