<s:select list="departmentList" id="deparmentId"name="departmentId" headerKey="" headerValue="请选择" listKey="departmentId"  listValue="name"  onchange="setEvent()" >
</s:select><s:select list="jobList" id="jobId"name="jobId" headerKey="" headerValue="请选择">
</s:select>

function setEvent(){//获取选中的部门idvar code = $("#departmentId").val();//获取职位对象var jobs = $("#jobId");//异步访问后台，获取所选部门的所有职位
   $.ajax({type:"post",data:{"departmentId",code},url: "department_init.action";//后台处理的action方法success:function(jobs){$.each(jobs , function(i){$("<option>" , {val:jobs[i].id ,   //这两个都是后台获取的[ { id : "" , name : "" },{id : "" , name : " "} ]这种格式的数据，是在后台构造的json格式的数据
               text:jobs[i].name}).appendTo(jobs);});}dataType: "json"});}

public void init(){this.getResponse().setContentType("text/html;charset=GBK");  this.getResponse().setCharacterEncoding("GBK");  PrintWriter pw=null;try {pw = this.getResponse().getWriter();} catch (IOException e) {e.printStackTrace();}//以下是根据部门id查询职位的方法，,sql语句逻辑如下List jobs= departmentService.find(" select t.id , t.name from jobs t where t.departmentid="+deparmtnetId+" " );//转换为json格式StringBuffer buff=new StringBuffer();buff.append("[");for(int i=0;i<jobsList.size();i++){Object[] obj = (Object[])jobsList.get(i);buff.append("{");buff.append("\"id\":"+obj[0].toString+",");buff.append("\"name\":\""+obj[1].toString+"\"");if(i==list.size()-1){buff.append("}");}else{buff.append("},");}}buff.append("]");//输出
    pw.write(buff.toString());}