當跳轉到一個含有form表單的頁面的時候
如<form:form commandName="useCarInfo"
必須要new一個useCarInfo的同名實例給jsp來接收表單中的參數,
否則報出異常
org.apache.jasper.JasperException: java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'useCarInfo' available as request attribute
