一、在jsp頁面中定義<select>標籤，如下：

<div>

    <span>科室:</span>

    <select class="dept-name-show" style="width: 70%;">

    </select>

</div>

二、編寫js語句：

<script>
    $(function () {
        var dname = $(".dept-name-show").eq(0);//選定<select>標籤
var url = "${pageContext.request.contextPath
 
}/getDepts.do";//請求路徑
$(".dept-name-show").click(function () {
            $.get(
                    url,
                    function (res) {
                        var len = res.length;
                        var op = dname.children().length;
                        if (op < len) {
                            var 
 
pp = "<option></option>";
                            for (var i = 0; i < len; i++) {
                                dname.append(pp);
                                dname.children().eq(i).text(res[i].name);
                            }
                        }
                    }
            )
        })
    })
</
 
script>

三、編寫對應的請求語句：

List<Dept> deptList=null;
@RequestMapping(value = "/getDepts",method = {RequestMethod.GET})
public void getDepts(HttpServletResponse response) throws IOException {
    response.setCharacterEncoding("utf-8");
    response.setContentType("text/json;charset=utf-8");
    if (deptList == null){
        deptList = deptService.findAllDepts();
    }else {
        String res=JSON.toJSONString(deptList);
        response.getWriter().write(res);
    }
}

四、實現效果如下：