public class ImageAction {
       private ArrayList<HashMap<String,String>> pks;

       public String update() {
         for (Map map: pks){
           doSth(map.get("seqNo"));
           .......

         }

       }

      public ArrayList<HashMap<String, String>> getPks() {
          return pks;
      }

      public void setPks(ArrayList<HashMap<String, String>> pks) {
          this.pks = pks;
      }

    }

   j$.ajax({
            url:approveUrl,
            data: {pks: {"seqNo":"111"}},
            dataType:'json',
            type:'post',
            traditional: true,
            success:function (response) {
                hideProgressBar(parent.document)
                if (response.result==false){
                    alert(response.msg);
                    return;
                }

//                document.location.reload();
            }

        })