Java实现ajax

jsp端的代码,sucess:function(){} 里面就是返回的处理

function ChangeTime(){
    alert("www");

        var startYmd = $('#t1').val();
        var endYmd = $('#t2').val();        

        var now = new Date();
        var today = new Date(now.getYear(),now.getMonth(),now.getDate());
        today = now.getYear() + "-" + (now.getMonth()+1) + "-" + now.getDate();
        var compdays = dateCompare(today, startYmd);
        var diffdays = dateCompare(startYmd, endYmd);
        if(diffdays < 0){
            alert("終了日が開始日より前です。選択し直して下さい。");
            return;
        }
        if(diffdays > 30){
            //検索期間制限：索期間は一ヶ月以上の場合、メッセージ「検索期間が一ヶ月以内の日付を選択して下さい。」を提示する
            alert("検索期間が一ヶ月以内の日付を選択して下さい。");
            return;
        }

        window.location.href="staffkakuteijyoukyou.do?startYmd="+startYmd+"&endYmd="+endYmd+"&SelYmd=1";

        var url="./staffkakuteijyoukyou.do?";
        $.ajax({
            url : url,
            dateType:"text",
            type : 'post',
            cache : false,
            data:"startYmd="+ startYmd + "&endYmd="+endYmd+"&SelYmd=1",
            success : function (returnVal) {     //这里的returnVal就是action里面输出的流，也就是所谓的返回信息
                    if(returnVal=="0"){
                        msg.text("出力するスタッフが見つかりません。");
                    }else{
                        //if(ele=='pdf'){
                        //    window.open('attendanceConfirm.do?method=output&outupType='+outupType+"&staffNameType="+staffNameType+"&restTimeType="+restTimeType+"&sagyoDate="+sDate,'','menubar=0,titlebar=0,status=0,location=0');
                        //}else{
                        //    window.location.href="attendanceConfirm.do?method=excel&outupType="+outupType+"&staffNameType="+staffNameType+"&restTimeType="+restTimeType+"&sagyoDate="+sDate;
                        //}
                        window.location.href="staffkakuteijyoukyou.do?startYmd="+startYmd+"&endYmd="+endYmd+"&SelYmd=1";
                    }
            },
            error : function (e) {
                alert($.customUM.msg.ajaxError);
            }
        });
      }

java 的action 代码，通过ajax无刷新的调用acton,然后将数据以流的形式就行输出，就可以在ajax进行接收并且利用

    public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request,
            HttpServletResponse response) throws Exception {
        String sagyoDate = request.getParameter("sagyoDate");
        //sagyoDate = "2015-05-11";
        String returnVal = "1";
        if(checkDate(sagyoDate)){
            //HttpSession session = request.getSession(true);
            //String ko_cd = (String) session.getAttribute("username");
            String ko_cd = request.getParameter("ko_cd");
            Integer pattern = SagyoDao.getInstance().getPattern(DBCommon.SAGYO_DB, ko_cd,sagyoDate);
            if(pattern==null||pattern==0){
                returnVal = "0";

            }
        }else{
            returnVal = "2";
        }
        response.setContentType("text/html");
        response.setCharacterEncoding("shift-jis");
        PrintWriter out = response.getWriter();
        out.print(returnVal);
        out.flush();
        out.close();

        return null;
    }