<script>
$(function(){
$("select").each(function(){
$(this).val($(this).attr("data-select"));
});

var provinceId = "${data.province}";
var cityId = "${data.city}";
var areaId = "${data.area}";

$.getJSON("${rc.contextPath}/region/listpivs", function(json){
$('#select_prov').append('<option>全部</option>');
$('#select_city').append('<option>全部</option>');
$('#select_area').append('<option>全部</option>');

$.each(json, function(i,val){
$('#select_prov').append(function(){
var p = $('<option></option>').attr('value',val.id).html(val.name);
return p;
});
});

if(provinceId != ""){
$('#select_prov').val(provinceId);
provChange(provinceId);
cityChange(cityId);
}
});

var provChange = function(id){
$('#select_city').empty();
$('#select_area').empty();

$('#select_city').append('<option>全部</option>');
$('#select_area').append('<option>全部</option>');

$.getJSON("${rc.contextPath}/region/listcitys/"+id, function(json){
                    $.each(json, function(i,val){                  
                        $('#select_city').append(function(){
                            var p = $('<option></option>').attr('value',val.id).html(val.name);
                            return p;
                        });
                    });
                   
                    if(cityId != ""){
    $('#select_city').val(cityId);
    cityChange(cityId);
    }
                });
}

var cityChange = function(id){
$('#select_area').empty();
$('#select_area').append('<option>全部</option>');

$.getJSON("${rc.contextPath}/region/listcitys/"+id, function(json){ 
                    $.each(json, function(i,val){                  
                        $('#select_area').append(function(){
                            var p = $('<option></option>').attr('value',val.id).html(val.name);
                            return p;
                        });
                    });
                    if(cityId != ""){
    $('#select_area').val(areaId);
    }
                });
}

$('#select_prov').on("change",function(){provChange($(this).val())});
$('#select_city').on("change",function(){cityChange($(this).val())});
});


JSP中

<div class="form-line split4">
<label>所在省份:</label>
<select name="province" id="select_prov" data-select="${data.province}">
</select>
</div>
<div class="form-line split4">
<label>所在城市:</label>
<select name="city" id="select_city" data-select="${data.city}">
</select>
</div>
<div class="form-line split4">
<label>所在区县:</label>
<select name="area" id="select_area" data-select="${data.area}">
             </select>
</div>


Controller.JAVA


String pro = (String)data.get("province");
String city = (String)data.get("city");
String area = (String)data.get("area");

if(StringUtils.isNoneBlank(area)){
data.put("regionId", area);
}else{
if(StringUtils.isNoneBlank(city)){
data.put("regionId", city);
}else{
data.put("regionId", pro);
}
}