解决extjs 单选及其传值的问题
一种是form里面直接提交传值给后台的例子：

Ext.onReady(function(){
	var formPanel = new Ext.FormPanel({
		id : "formPanel",
		name : "formPanel",
		width : 800,
		renderTo : "formPanelDiv",
		onSubmit: Ext.emptyFn,
       	submit: function(){
	    	this.getEl().dom.action="formPanel.htm"; 
	        this.getEl().dom.submit();
	    },
		items : [
			new Ext.form.TextField({
				id : "id",
				name : "id",
				allowBlank : false,
				blankText : "ID不能为空",
				fieldLabel : "ID",
				labelStyle : "text-align:right"
			}),
			new Ext.form.TextField({
				id : "name",
				name : "name",
				allowBlank : false,
				blankText : "姓名不能为空",
				fieldLabel : "姓名",
				labelStyle : "text-align:right"
			}),
			new Ext.form.RadioGroup({
				fieldLabel : "性别",
				labelStyle : "text-align:right",
				width : 80,
				items : [
					new Ext.form.Radio({
						name : "sex",
						boxLabel : "男",
						inputValue : "male",
						width : 20
					}),
					new Ext.form.Radio({
						name : "sex",
						boxLabel : "女",
						inputValue : "female",
						width : 20
					})
				]
			}),
			new Ext.form.TextField({
				id : "email",
				name : "email",
				fieldLabel : "邮箱",
				labelStyle : "text-align:right"
			})
		],
		buttons : [
			{
				text : "登录",
				id : "btn_login",
				handler : function(){
					if(formPanel.getForm().isValid()){
						formPanel.getForm().submit();
					}
				}
			},
			{
				text : "重置",
				id : "btn_reset",
				handler : function(){
					formPanel.getForm().reset();
				}
			}
		],
		buttonAlign : "center"
	});
});

后台是controller或jsp可以直接接收form提交过来的值
String sex= request.getParameter("sex");
...........

第二种是用ajax传值的例子：

Ext.onReady(function(){  

     Ext.QuickTips.init();  

     Ext.override(Ext.form.RadioGroup, {      
    getValue: function(){      
        var v;      
        if (this.rendered) {      
            this.items.each(function(item){      
                if (!item.getValue())       
                    return true;      
                v = item.getRawValue();      
                return false;      
            });      
        }      
        else {      
            for (var k in this.items) {      
                if (this.items[k].checked) {      
                    v = this.items[k].inputValue;      
                    break;      
                }      
            }      
        }      
        return v;      
    },      
    setValue: function(v){      
        if (this.rendered)       
            this.items.each(function(item){      
                item.setValue(item.getRawValue() == v);      
            });      
        else {      
            for (var k in this.items) {      
                this.items[k].checked = this.items[k].inputValue == v;      
            }      
        }      
    }      
});     
     
  
var radiogroup= new Ext.form.RadioGroup({   
                fieldLabel : "radioGroup",   
                items : [{   
                            boxLabel : '男',   
                            inputValue : "男",   
                            name : "rg",   
                            checked : true  
                        }, {   
                            boxLabel : '女',   
                            name : "rg",   
                            inputValue : "女"  
                        }]   
            });

     var _form=new Ext.form.FormPanel({  

         renderTo:'login-form',  

         title:'系统登录',  

         frame:true,  

         width:290,  

         height:160,  

         layout:'form',  

         buttonAlign:'center',  

         labelAlign:'center',  

         defaults:{width:160,labelWidth:80,xtype:'textfield'},  

         items:[  

             {fieldLabel:'用 户 名',vtype:'alpha',id:'name',name:'name'},  

             {fieldLabel:'通 行 证',inputType:'password',vtype:'alpha',id:'pass',name:'pass'},  

             radiogroup