你先看下你springMVC 返回的json 数据的格式是否正确，是否跟easyui 的格式能正确的匹配上。

个人签名:[url=http://www.sdpretty.com]健康宝宝[/url]

[code="java"]YAHOO.util.Event.onDOMReady(function(){
var Event = YAHOO.util.Event;

            window.moveTo(0,0);
            window.resizeTo(screen.availWidth,screen.availHeight);

            var dsOption ={
                fields : [
                    {name : 'itemName'},
                    {name : 'contractRatifyDate',type:'date'},
                    {name : 'poNo'},
                    {name : 'rowItem'},
                    {name : 'materialNo'},
                    {name : 'materialDepict'},
                    {name : 'amount'},
                    {name : 'unit'},
                    {name : 'waitReplayAmount'},
                    {name : 'requireDate'},
                    {name : 'deliveryType'},
                    {name : 'shortAddress'},
                    {name : 'onWayAmount'},
                    {name : 'unDeliveryAmount'},
                    {name : 'providerCode'},
                    {name : 'providerName'},
                    {name : 'buyerId'},
                    {name : 'deliveryDate',type:'date'},
                    {name : 'deliveryAmount'},
                    {name : 'judgeReason'},
                    {name : 'remark'}
                ],
                recordType : "object"
            };

            var colsOption = [
                {id:'itemName',header:"<fmt:message key='PROJECTNAME'/>",width:60},//editor:{type:"text"}},
                {id:'contractRatifyDate',header:"<fmt:message key='deliveryManage_po_to_sapstate_X.contractRatifyDate'/>",width:90},//editor:{type:"date"}},
                {id:'poNo',header:"<fmt:message key='barcode_showDeliveryInfo.idxPoNO'/>",width:60},//editor:{type:"text"}},
                {id:'rowItem',header:"<fmt:message key='barcode_showDeliveryInfo.rowItem'/>",width:50},//editor:{type:"text"}},
                {id:'materialNo',header:"<fmt:message key='DP.MaterialNo'/>",width:60},//editor:{type:"text"}},
                {id:'materialDepict',header:"<fmt:message key='barcode_showDeliveryNote.materielDepict'/>",width:60},//editor:{type:"text"}},
                {id:'amount',header:"<fmt:message key='M11428'/>",width:60},//editor:{type:"text"}},
                {id:'unit',header:"<fmt:message key='barcode_showDeliveryInfo.unit'/>",width:40},//editor:{type:"text"}},
                {id:'waitReplayAmount',header:"<fmt:message key='DP.WaitReplyingAmount'/>",width:80},//editor:{type:"text"}},
                {id:'requireDate',header:"<fmt:message key='deliveryManage_po_show.deliveryDate'/>",width:70},//editor:{type:"date"}},
                {id:'deliveryType',header:"<fmt:message key='M11425'/>",width:60},//editor:{ type :"select" ,options : {'按订单日期交货': '按订单日期交货'}}}, //editor:{type:"text"}},
                //{id:'shortAddress',header:"交货地址简写",width:80},//editor:{type:"text"}},
                {id:'onWayAmount',header:"<fmt:message key='DP.OnWayAmount'/>",width:60},
                {id:'unDeliveryAmount',header:"<fmt:message key='DP.UnDeliveryAmount'/>",width:70},
                {id:'providerCode',header:"<fmt:message key='SupplierCode'/>",width:80},//editor:{type:"text"}},
                {id:'providerName',header:"<fmt:message key='Supplier'/>",width:80},//editor:{type:"text"}},
                {id:'buyerId',header:"<fmt:message key='PURCHASER'/>",width:50},//editor:{type:"text"}},
                {id:'deliveryDate',header:"<fmt:message key='DELIVERYDATE'/>",width:70},//editor:{type:"date"}},
                {id:'deliveryAmount',header:"<fmt:message key='M10223'/>",width:60},//editor:{type:"text"}},
                {id:'judgeReason',header:"<fmt:message key='pingdingliyou'/>",width:80},
                {id:'remark',header:"<fmt:message key='REMARK'/>",width:100}//,editor:{type:"text"}}
            ];

            var gridOption={
                id : "selectBuf",
                width : "100%",
                height : "400",
                container : 'gridbox',
                replaceContainer : true,
                loadURL : "selectBuf.do?__METHOD=queryBuf",
                dataset : dsOption,
                columns : colsOption,
                toolbarContent : "nav | goto | reload",
                showIndexColumn : true
            };

            var mygrid = new Sigma.Grid(gridOption);
            Sigma.Util.onLoad(Sigma.Grid.render(mygrid));

            YAHOO.util.Event.on("searchBuf","click",function(e){
            mygrid.cleanParameters();
            mygrid.addParameters("poNo",YAHOO.util.Dom.get("poNo").value);
            mygrid.addParameters("rowItem",YAHOO.util.Dom.get("rowItem").value);
            YAHOO.util.Dom.get("poNo").value = "";
            YAHOO.util.Dom.get("rowItem").value = ""; 
            mygrid.reload(true,true);
            });

            });
            [/code]

这个SPRING MVC的RESPONSEBODY注解，后台返回前台JAON数据时，报406错误，是因为你的URL请求的问题，如果是HTM的话，就不行的。你可以将URL改成url.json，即可。