request.setAttribute和request.getAttribute的搭配使用

前臺頁面帶着areaid參數請求更新此id的數據，跳轉到更新數據頁面時需要在更新頁面先填充上原來的數據。用request.setAttribute和request.getAttribute的搭配使用來解決此問題。

關鍵語句：

request.setAttribute("areamap", area.get(0).getAreaMap());

value:'<%=request.getAttribute("areaname")%>'

@RequestMapping(value="area_updateInput.action")
	public String areaUpdateInput(int areaId,HttpServletRequest request){
	System.out.println(areaId);List<AreaDomain> area=areaService.getAreaById(areaId);
        request.setAttribute("areaname", area.get(0).getAreaName());
	request.setAttribute("areamap", area.get(0).getAreaMap());
	request.setAttribute("arearemark", area.get(0).getAreaRemark());
	request.setAttribute("areaextend", area.get(0).getAreaExtend());
	request.setAttribute("areascales", area.get(0).getAreaScales());
	request.setAttribute("devicetablename", area.get(0).getDeviceTablename());
	request.setAttribute("spacetablename", area.get(0).getSpaceTablename());
	request.setAttribute("pathtablename", area.get(0).getPathTablename());
	return "person_manage/area/area_update_input";}

var devInfoForm = new Ext.FormPanel({
	        labelWidth: 75, // label settings here cascade unless overridden
	        frame:true,
	        title: '更新區域',
	        bodyStyle:'padding:5px 5px 0',
	        width: 350,
	        defaults: {width: 230},
	        defaultType: 'textfield',
			name:"areaInfo",
	        items: [{
	                fieldLabel: '區域名稱',
	                name: 'areaName',
	                value:'<%=request.getAttribute("areaname")%>',
	                allowBlank : false //此驗證依然有效.不許爲空. 
	            },{
	                fieldLabel: '區域地圖',
	                name: 'areaMap',
	                value:'<%=request.getAttribute("areamap")%>'
				},{
	                fieldLabel: '區域備註',
	                name: 'areaRemark',
	                value:'<%=request.getAttribute("arearemark")%>'
				},{
	                fieldLabel: '區域座標',
	                name: 'areaExtend',
	                value:'<%=request.getAttribute("areaextend")%>',
	        		regex :/^[+-]?([1-9][0-9]*|0),[+-]?([1-9][0-9]*|0),[+-]?([1-9][0-9]*|0),[+-]?([1-9][0-9]*|0)$/, //正則表達式在/...../之間.
	                regexText:"格式例如10,-60,80,0",  
	                allowBlank : false //此驗證依然有效.不許爲空. 
				},{
	                fieldLabel: '區域比例',
	                name: 'areaScales',
	                value:'<%=request.getAttribute("areascales")%>',
	        		regex : /^([1-9][0-9]*|0),([1-9][0-9]*|0),([1-9][0-9]*|0)$/,  
	                regexText:"格式例如400000,250000,80000",
	                allowBlank : false  	
				},{
	                fieldLabel: '設備表名',
	                name: 'deviceTablename',
	                value:'<%=request.getAttribute("devicetablename")%>'
				},{
	                fieldLabel: '空間表名',
	                name: 'spaceTablename',
	                value:'<%=request.getAttribute("spacetablename")%>'
				},{
	                fieldLabel: '路徑表名',
	                name: 'pathTablename',
	                value:'<%=request.getAttribute("pathtablename")%>'
				}
	        ],