如何从Hibernate Validator中检索默认验证消息？

问题描述

我正在尝试使用 MessageSource 检索默认验证错误消息。我正在使用的代码使用反射来检索消息参数的值。在不覆盖消息参数的约束上，我想检索默认错误消息。当我在验证注释上调用消息方法时，我得到 {org.hibernate.validator.constraints.NotBlank.message} （例如，对于 @NotBlank 注释）。然后我尝试使用 MessageSource 来获取如下错误消息：

I'm trying to retrieve a default validation error-message using MessageSource. The code I'm working with uses reflection to retrieve the value of the message parameter. On a constraint that does not override the message parameter, I would like to retrieve the default error message. When I invoke the message method on the validation annotation, I get {org.hibernate.validator.constraints.NotBlank.message} (for example, for the @NotBlank annotation). I then tried to use MessageSource to get the error message like so:

String message = messageSource.getMessage(key, null, Locale.US);

我尝试将键设置为 {org.hibernate.validator.constraints.NotBlank.message} ， org.hibernate.validator.constraints.NotBlank.message （已删除大括号）甚至 org.hibernate.validator.constraints.NotBlank 但我一直得到 null 。我在这里做错了什么？

I tried setting key to {org.hibernate.validator.constraints.NotBlank.message}, org.hibernate.validator.constraints.NotBlank.message (removed braces) and even org.hibernate.validator.constraints.NotBlank but I keep getting null. What am I doing wrong here?

更新

澄清。我的印象是Spring为其约束提供了一个默认的 message.properties 文件。我在这个假设中是否正确？

A clarification. I am under the impression that Spring comes with a default message.properties file for its constraints. Am I correct in this assumption?

更新

更改名称问题是为了更好地反映我想要做的事情。

Changing the name of the question to better reflect what I was trying to do.

推荐答案

在遇到以及在Hibernate中挖掘之后验证器来源，我想我已经弄明白了：

After running into a blog post from one of the Hibernate guys, and after digging around in the Hibernate Validator source, I think I've figured it out:

public String getMessage(Locale locale, String key) {
    String message = key;
    key = key.toString().replace("{", "").replace("}", "");

    PlatformResourceBundleLocator bundleLocator = new PlatformResourceBundleLocator(ResourceBundleMessageInterpolator.DEFAULT_VALIDATION_MESSAGES);
    ResourceBundle resourceBundle = bundleLocator.getResourceBundle(locale);

    try {
       message = ResourceBundle.getString(key);
    }

    catch(MissingResourceException ) {
       message = key;
    }

    return message;
}

首先，你必须实例化 PlatformResourceBundleLocator 使用默认验证消息。然后从定位器中检索 ResourceBundle 并使用它来获取您的消息。我不相信这会执行任何插值。为此你必须使用插值器;我上面链接的博客文章详细介绍了这一点。

So first, you have to instantiate a PlatformResourceBundleLocator with the default validation messages. Then you retrieve a ResourceBundle from the locator and use that to get your message. I don't believe this performs any interpolation though. For that you have to use an interpolator; the blog post I linked to above goes into more detail about that.

UPDATE

另一种（更简单）方法是更新 applicationContext.xml 并执行此操作：

Another (easier) way is to update your applicationContext.xml and do this:

<bean id="resourceBundleSource" class="org.springframework.context.support.ResourceBundleMessageSource">
    <property name="basenames">
        <list>
            <value>org.hibernate.validator.ValidationMessages</value>
        </list>
    </property>
</bean>

现在你的 MessageSource 填充了默认值消息，你可以做 messageSource.getMessage（）。事实上，这可能是最好的方式。

Now your MessageSource is populated with the default messages and you can do messageSource.getMessage(). In fact, this is probably the best way.

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