表單的提交form.submit和Ajax請求裡的success和failure回撥函式有點區別，

表單提交後要求後臺返回的必須是json字串，且必須包含success:true 或 success:false，如果不包含這個直接返回一個json字串就會執行failure函式，這個鬱悶我一下午……

Ajax請求則不同，只要後臺返回一個字串就能成功接收到

表單提交（這裡我就直接寫handler了）

		handler : function() {
					var form = me.down('form').getForm();
					if (form.isValid()) {
						form.submit({
							url : 'http://localhost:8080/b_springmvc_extjs/formSubmit.do',
							method : 'POST',
							waitTitle : "提示",
							waitMsg : '正在提交資料，請稍後 ……',
							success : function(form, action) {
								Ext.Msg.alert('success', 'bbb  ' + form
												+ action.result.msg);
								this.close();
							},
							failure : function(form, action) {
								Ext.Msg.alert('failure', 'bbb' + form
												+ action.result.msg);
								this.close();
							}
						});
					}
				}
 

	@RequestMapping(value = "/formSubmit.do", method = RequestMethod.POST)
	@ResponseBody
	public String formSubmit(@ModelAttribute(value = "user") User user) {
		if (user != null || !equals("")) {
			System.out.println(user.getId());
			System.out.println(user.getFirstname());
			System.out.println(user.getLastname());
			try {
				Thread.sleep(1000 * 2);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
			return "{success:true,msg:'success submit --- yang'}";
		}
		return "{success:false,msg:'failure submit --- xuan'}";
	}
 

'frameNorth combo[id=changeSkin]' : {
						focus : this.comboFocus
				}

comboFocus : function(combo, The, eOpts) {		
		Ext.Ajax.request({	//ajax request test
					url : 'http://localhost:8080/b_springmvc_extjs/ajaxRequest.do',
					 /*  headers: {
					       'userHeader': 'userMsg'
					   },*/
					params : {
						name : 'yangxuan'
					},
					method : 'POST',
					success : function(response, options) {
						Ext.MessageBox.alert('成功', '服務端返回資料 : '+ response.responseText);
					},
					failure : function(response, options) {
						Ext.MessageBox.alert('失敗', '錯誤編號：' + response.status);
					}
				});
	},
 

@RequestMapping(value = "ajaxRequest.do", method = RequestMethod.POST)
	@ResponseBody
	public String ajaxRequest(@RequestParam(value = "name") String name) {
		if (name != null || !name.equals("")) {
			System.out.println("name : " + name);
			return "success ajax request";
		}
		return "fail ajax request";
	}