如何在freemarker模板中显示验证错误

Question

我所做的所有approches都在freemarker模板中显示我的验证错误失败。 我使用spring mvc version 3。

我的表格看起来像那样

<@layout.basic>
<@spring.bind "user" />
<#if spring.status.error>
    <div class="errors">
        There were problems with the data you entered:
        <ul>
            <#list spring.status.errorMessages as error>
                <li>${error}</li>
            </#list>
        </ul>
    </div>
<#else>
    <div class="errors">
        There are no errors.
    </div>
</#if>
<form action="" method="POST">
    <dl>
        <dt>Login:</dt>
            <dd><@spring.formInput  "user.name" />
            <dd><@spring.showErrors "<br>" />
        <dt>E-Mail:</dt>
            <dd><@spring.formInput "user.email" />
            <dd><@spring.showErrors "<br>" />
        <dt>Password:</dt>
            <dd><@spring.formPasswordInput "user.passwort" />
            <dd><@spring.showErrors "<br>" />
        <dt>Password verification:</dt>
            <dd><input type="password" name="passVerification"/>
            <dd><@spring.showErrors "<br>" />
        <dt>Should the User have administrator rights?</dt>
            <dd><input type="checkbox" name="isAdmin"/>
            <dd><@spring.showErrors "<br>" />
        <br>
            <dd><input type="submit" value="Create" />
    </dl>
</form>

我的基本布局看起来像那样

<#macro basic> 
<#-- needed for query spring security status -->
<#assign security=JspTaglibs["http://www.springframework.org/security/tags"] />
<!DOCTYPE HTML>
<html>
    <head>
        <title>Testform</title>
    </head>
    <body>
        <div id=header>
            <@security.authorize ifAnyGranted="ROLE_ADMIN">
                <a href='<@spring.url "/user/add" />'>Add user | </a>
                <a href='<@spring.url "/user/manage" />'>Manage users | </a>
            </@security.authorize>    
            <@security.authorize ifAnyGranted="ROLE_USER">
                <a href='<@spring.url "/job/add" />'>Add job | </a>
                <a href='<@spring.url "/job/show" />'>Show jobs | </a>
            </@security.authorize>
        </div>
        <div id=errors>
        </div>
        <div id=content>
            <#nested>
        </div>
        <div id=footer>
            <@security.authorize ifAnyGranted="ROLE_USER">
                <a href='<@spring.url "/j_spring_security_logout" />'>Logout</a>
            </@security.authorize>
        </div>
    </body>
</html>
</#macro>

我在servlet配置中定义了spring.ftl

<property name="freemarkerSettings">
    <props>
        <prop key="auto_import">layout.ftl as layout, spring.ftl as spring</prop>
    </props>
</property>

我的控制器看起来像这样

@RequestMapping( value = "/add", method = RequestMethod.POST ) 
public String addUser(
        @RequestParam(value="isAdmin",defaultValue="false") Boolean isAdmin,
        @RequestParam(value="passVerification" ) String passVerification,
        @ModelAttribute("user") C_UserDAO newUser
) {
    final BindException errors = new BindException( newUser, "user" );
    m_userValidator.validate( newUser, errors );
    ...
    if( !newUser.getPassword().equals( passVerification ) && !newUser.getPassword().equals( "" ) ) {
        errors.rejectValue( "password", "user.password.missmatch", "The passwords aren't equal, try again" );
    }
    if( errors.hasErrors() ) {
        return "addUserForm";
    }
    ...
    return "redirect:thanks.html";
}

验证就像魅力一样，但是当发生错误时，视图不会改变，也不会显示错误。 我一遍又一遍地阅读文档，但我找不到如何解决问题。 我的错误是什么？

Answer 1

我不熟悉FreeMarker，但我发现你的BindingResult与模型无关。 您需要在相应的模型属性之后将其添加到方法的签名中：

@RequestMapping( value = "/add", method = RequestMethod.POST )  
public String addUser( 
        @RequestParam(value="isAdmin",defaultValue="false") Boolean isAdmin, 
        @RequestParam(value="passVerification" ) String passVerification, 
        @ModelAttribute("user") C_UserDAO newUser,
        BindingResult errors
) { 
    ...
}