javascript对xml的解析 （ajax,dom4j)

 

javascript对xml的解析

 

 

function selectProv(field) {
 var xmlHttp = null;
 //表示当前浏览器不是ie,如ns,firefox
 if(window.XMLHttpRequest) {
  xmlHttp = new XMLHttpRequest();
 } else if (window.ActiveXObject) {
  xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
 }
 var url = "${pageContext.request.contextPath}/servlet/SelectProvServlet?regionId=" + trim(field.value) + "&time=" + new Date().getTime();
 
 //设置请求方式为GET，设置请求的URL，设置为异步提交
 xmlHttp.open("GET", url, true);
 
 xmlHttp.onreadystatechange=function() {
  //Ajax引擎状态为成功
  if (xmlHttp.readyState == 4) {
   //HTTP协议状态为成功
   if (xmlHttp.status == 200) {
    var doc = xmlHttp.responseXML;
    var items = doc.getElementsByTagName("item");
    //取得省下拉列表
    var provSelect = document.getElementById("province");
    //清除省下拉列表中的值
    provSelect.options.length = 0;
    var o = new Option("--全部--", 0);
    provSelect.add(o);
    for (var i=0; i<items.length; i++) {
     //var id = items[i].childNodes[0].childNodes[0].nodeValue;
     //var name = items[i].childNodes[1].childNodes[0].nodeValue;
     var id = items[i].childNodes[0].firstChild.nodeValue;
     var name = items[i].childNodes[1].firstChild.nodeValue;
     //alert(id + "," + name);
     //构造下拉列表的Option对象
     var o = new Option(name, id);
     //向下拉列表中添加选项
     provSelect.add(o);
    }
   }else {
    alert("请求失败，错误码=" + xmlHttp.status);
   }
  }
 };
 
 //将设置信息发送到Ajax引擎
 xmlHttp.send(null);
}

 

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import java.io.IOException;
import java.util.Iterator;
import java.util.Map;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;

import com.bjpowernode.drp.basedata.manager.ClientManager;

/**
 * 下拉联动，根据区域代码选择省
 * @author Administrator
 *
 */
public class SelectProvServlet extends HttpServlet {

 /*
 1、自定义格式
 10023,吉林省#10025,辽宁省#10026,黑龙江
 
 2、XML格式
 <?xml version="1.0" encoding="UTF-8"?>
 <items>
  <item>
   <id>10023</id>
   <name>吉林省</name>
  </item>
  <item>
   <id>10025</id>
   <name>辽宁省</name>
  </item>
  <item>
   <id>10026</id>
   <name>黑龙江</name>
  </item>
 </items>
 */
 @Override
 protected void doGet(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {

  response.setContentType("text/xml;charset=UTF-8");
  int regionId = Integer.parseInt(request.getParameter("regionId"));
  if (regionId != 0) {
   Map<Integer, String> map = ClientManager.getInstance().getProvByRegionId(regionId);
   Document doc = DocumentHelper.createDocument();
   Element rootElt = doc.addElement("items");
   for (Iterator<Map.Entry<Integer, String>> iter=map.entrySet().iterator(); iter.hasNext();) {
    Map.Entry<Integer, String> entry = iter.next();
    Element itemElt = rootElt.addElement("item");
    Element idElt = itemElt.addElement("id");
    idElt.setText(String.valueOf(entry.getKey()));
    Element nameElt = itemElt.addElement("name");
    nameElt.setText(entry.getValue());
   }

   String xmlString = doc.asXML();
   System.out.println(xmlString);
   response.getWriter().print(xmlString);

  }
 }

}