public class JsonAction extends EmpBaseAction{

	private EmpDto empDto;

	private String loc;

	HttpServletRequest request;

	public String findLoc() throws IOException, SQLException{

		request = ServletActionContext.getRequest();

		String deptno = request.getParameter("deptno");

		System.out.println("deptno-----------------------------------------------"+deptno);

		loc = EmpDtoDao.findLocByDeptno(deptno);

		System.out.println("loc-----------------------------------------------"+loc);

		empDto.setLoc(loc);

		return "success";

	}



	public EmpDto getEmpDto() {

		return empDto;

	}

	public void setEmpDto(EmpDto empDto) {

		this.empDto = empDto;

	}

}

 <package name="json" extends="json-default" namespace="/emp">

     <action name="jsonAction" class="com.sisj.action.JsonAction"  method="findLoc">

     <result name="success" type="json">

    	 <param name="contentType">

                text/html

         </param>

         <param name="includeProperties">

         empDto\.loc

         </param>

     </result>

   </action>

 </package>

<script type="text/javascript" >

$(function(){

	$("#deptno").change(function(){

		var deptno = $('#deptno').val();



	 	$.ajax({

            type: "POST",

            url: "jsonAction.action",

            data: {"deptno": deptno, "method": "findLoc"},

            dataType: 'json',

           // async: true,

	 		error: function(XMLHttpRequest, textStatus, errorThrown) {

	 			alert("获取失败。");

                alert("http请求的状态:"+XMLHttpRequest.status);//200

                alert("XMLHttpRequest对象的处理状态:"+XMLHttpRequest.readyState);//4

                alert(textStatus);//parsererror

            },

            success: function(data){

            	alert("SUCCESS");

            	if(data.empDto.loc == undefined){

            		$('label:#locId').empty();