如何通过ajax传递ArrayList<HashMap>给action

 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();            }        })