grails中要求输入两次密码判断一致

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create.gsp是调用_form.gsp页面。主要是修改_form页面，

_form页面代码：

<%@ page import="myclass.User" %>

<div class="fieldcontain ${hasErrors(bean: userInstance, field: 'intro', 'error')} ">
<label for="intro">
个人简介：

</label>
<g:textField name="intro" value="${userInstance?.intro}"/>
</div>


<div class="fieldcontain ${hasErrors(bean: userInstance, field: 'email', 'error')} ">
<label for="email">
Email：

</label>
<g:textField name="email" value="${userInstance?.email}"/>
</div>


<div class="fieldcontain ${hasErrors(bean: userInstance, field: 'name', 'error')} ">
<label for="name">
名字：

</label>
<g:textField name="name" value="${userInstance?.name}"/>
</div>


<div class="fieldcontain ${hasErrors(bean: userInstance, field: 'password', 'error')} ">
<label for="password">
密码：

</label>
<g:textField name="password" value="${userInstance?.password}"/>
</div>
<div class="fieldcontain ${hasErrors(bean: userInstance, field: 'password', 'error')} ">
<label for="password">
确认密码：

</label>
<g:textField name="password2" value="${userInstance?.password}"/>
</div>

UserController.groovy代码（主要是修改save）

def save(User userInstance) {

       if(params.password!=params.password2){
         flash.message="密码前后输入不一致，请重新输入！"
redirect(action:"create")
       }
       else{
          userInstance.name=params.name
 userInstance.email=params.email
 userInstance.password=params.password
 userInstance.intro=params.intro
 userInstance.save()
 render "用户创建成功！"
       

       }

}