dom解析xml实现省市区动态级联是一个项目中的一部分，项目是springMVC实现的，其配置文件这儿就不在说了，现只简单列出一些主要的代码。看懂需要有一定的springMVC基础
配置文件中的省的值
city.area.province=黑龙江,湖南
在action中
private @Value("${city.area.province}") String provinceStr;
model.addAttribute("provinceList", ManagerUtil.getSelectBean(provinceStr));//获取省的下拉列表
//根据省获取市
public void getCityListByProvince(@RequestParam("province") String province,
Model model, HttpServletResponse response) {
try {
province = URLDecoder.decode(province, "utf-8");
} catch (UnsupportedEncodingException e1) {
e1.printStackTrace();
}
response.setCharacterEncoding("utf-8");
getListValue("province", "city", province, response);
}
//根据市获取区县
public void getAreaListByCity(@RequestParam("city") String city,
Model model, HttpServletResponse response) {
try {
city = URLDecoder.decode(city, "utf-8");
} catch (UnsupportedEncodingException e1) {
e1.printStackTrace();
}
response.setCharacterEncoding("utf-8");
getListValue("city", "area", city, response);
}
//
private void getListValue(String type, String childType, String value, HttpServletResponse response) {
StringBuilder sb = new StringBuilder();
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
try {
DocumentBuilder builder = factory.newDocumentBuilder();
Document document = builder.parse(new File(UserController.class.getResource("/").toString().substring(6)
+ "/city-area.xml"));
NodeList nodeList = document.getElementsByTagName(type);
for(int i=0; i<nodeList.getLength(); i++) {
Element e = (Element) nodeList.item(i);
String name = e.getAttribute("name");
if(name.equals(value)){
NodeList childList = e.getElementsByTagName(childType) ;
for(int j=0; j<childList.getLength(); j++) {
sb.append(",").append(((Element) childList.item(j)).getAttribute("name"));
}
break;
}
}
}catch(SAXException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch(ParserConfigurationException e) {
e.printStackTrace();
}
try {
response.getWriter().write(JsonUtil.toJsonString(ManagerUtil.getSelectBean(sb.substring(1).toString())));
} catch (IOException e) {
e.printStackTrace();
}
}
JsonUtil类的toJsonString方法
public static String toJsonString(Object o) {
if(o instanceof Collection) {
StringBuffer buf = new StringBuffer("");
Object[] objs = JSONArray.fromObject(o).toArray();
for (int i = 0; i < objs.length; i ++) {
if(i!=0) buf.append(",");
buf.append(JSONObject.fromObject(objs[i]).toString());
}
return "{totalCount:" + objs.length + ",root:[" + buf.toString() + "]}";
}
return JSONObject.fromObject(o).toString();
}
ManagerUtil类中的getSelectBean方法
public static List<SelectBean> getSelectBean(String str) {
List<SelectBean> selectBeanList = new ArrayList<SelectBean>();
if (!StringUtils.isEmpty(str)) {
for (String item : str.split(",")) {
SelectBean selectBean = new SelectBean();
selectBean.setLabel(item.trim());
selectBean.setValue(item.trim());
selectBeanList.add(selectBean);
}
}
return selectBeanList;
}
jsp主要部分
<script type="text/javascript">function changeCityList(obj) {
var citySelect = $("#uCity");
var areaSelect = $("#uArea");
citySelect.empty();
areaSelect.empty();
citySelect.append("<option value=''>请选择市</option>");
areaSelect.append("<option value=''>请选择区/县</option>");
if($(obj).val() != '') {
$.ajax({
type: "POST",
url: '....../getCityListByProvince.do?province=' +
encodeURIComponent(encodeURIComponent($(obj).val())),
async:false,
dataType:'text',
success: function(json) {
var data = (eval('(' + json + ')')).root;
for(var i=0; i<data.length; i++){
citySelect.append("<option value=" + data[i].value + ">" + data[i].label + "</option>");
}
}
});
}
}
function changeAreaList(obj) {
// alert($(obj).val());
var areaSelect = $("#uArea");
areaSelect.empty();
areaSelect.append("<option value=''>请选择区/县</option>");
if($(obj).val() != ''){
$.ajax({
type: "POST",
url: '...../getAreaListByCity.do?city=' +
encodeURIComponent(encodeURIComponent($(obj).val())),
async:false,
dataType:'text',
success: function(json) {
// var areaSelect = $("#uArea");
var data = (eval('(' + json + ')')).root;
for(var i=0; i<data.length; i++){
areaSelect.append("<option value=" + data[i].value + ">" + data[i].label + "</option>");
}
}
});
}
}
</script>
<div class="rfm">
<table>
<tr>
<th><span class="rq">*</span><label for="369bQT">省:</label></th>
<td>
<select id="uProvince" onchange="changeCityList(this)" name="uProvince" style="width:230px">
<option value="">请选择省份</option>
<c:forEach items="${provinceList }" var="province">
<option value="${province.value }">${province.label }</option>
</c:forEach>
</select>
</td>
</tr>
</table>
</div>
<div class="rfm">
<table>
<tr>
<th><span class="rq">*</span><label for="369bQT">市:</label></th>
<td>
<select id="uCity" name="uCity" onchange="changeAreaList(this)" style="width:230px">
<option value="">请选择市</option>
</select>
</td>
</tr>
</table>
</div>
<div class="rfm">
<table>
<tr>
<th><span class="rq">*</span><label for="369bQT">区:</label></th>
<td>
<select id="uArea" name="uArea" style="width:230px">
<option value="">请选择区/县</option>
</select>
</td>
</tr>
</table>
</div>
city-area.xml的部分内容(这里主要是说明一下它的格式)
<?xml version="1.0" encoding="UTF-8" ?>
<root name="中国">
<province name="黑龙江" id="黑龙江">
<city name="大庆市">
<area name="萨尔图区"/>
<area name="龙凤区"/>
<area name="让胡路区"/>
<area name="红岗区"/>
<area name="大同区"/>
<area name="肇州县"/>
<area name="肇源县"/>
<area name="林甸县"/>
<area name="杜尔伯特蒙古族自治县"/>
</city>
<city name="七台河市">
<area name="桃山区"/>
<area name="新兴区"/>
<area name="茄子河区"/>
<area name="勃利县"/>
</city>
</province>
</root>