//strut  json配置

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

      <action name="*_Ajax" class="cztAction" method="{1}_Ajax">

        <interceptor-ref name="json" /><!--处理以JSON文本提交的请求-->

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

         </result> <!--将action的bean属性以json字符串返回浏览器-->

      </action>

    </package>

//action

public String selectThemeMode_Ajax() throws IOException{

    List<String> themeModeList=queryThemeModeList();

    HttpServletResponse response=ServletActionContext.getResponse();

    //声明JSONObject  

    //以下实现将JSON字符串传到前台

    response.setContentType("text/json");

    response.setCharacterEncoding("UTF-8");

    PrintWriter out = null;

    String jsonStr="[";

    try {  

        for(String np:themeModeList){

            jsonStr+="{\"name\":\""+np.split(",")[0]+"\",\"num\":\""+np.split(",")[1]+"\"},";

        }

        jsonStr=jsonStr.substring(0, jsonStr.length()-1);

        jsonStr+="]";

        out = response.getWriter();

        System.out.println(jsonStr);

        out.print(jsonStr);

    } catch (IOException e) {

        System.out.println("FareAction:queryFareDetail" + e.getMessage());

    }finally {

        out.flush();

        out.close();

    }

    return "success";

}

//js 代码

//ajax选择模板

 function selectThemeModeAjax(pNum){

   //$("#themeModeList").css("display","block");

    $.ajax({

        type:'GET',

        url:'/themeAjax/selectThemeMode_Ajax.htm',

        data:{},//发送的参数

        dataType:'json',

        error:function(){

            alert("加载失败,请重试!");

            return false;

        },

        success:function(data){

            for(var o in data){

        //alert(o);

        //alert(data[o]);

        alert("text:"+data[o].name+" value:"+data[o].num );

      }

        }

    });

  }