Spring:如何从属性文件中设置 @DateTimeFormat 的模式? [英] Spring: How do I set the pattern of a @DateTimeFormat from a properties file?

问题描述

我使用的是 Spring 3.1.1.RELEASE.我有一个模型，我提交给我的一个控制器.其中，是以下字段

I'm using Spring 3.1.1.RELEASE. I have a model that I submit to one of my controllers. In it, is the following field

@DateTimeFormat(pattern = "#{appProps['class.date.format']}")
private java.util.Date startDate;

但是，上面的方法不起作用(EL 没有被解释)，因为每次我提交表单时，我都会收到一个错误.如果我使用以下

However, the above doesn't work (the EL isn't being interpreted), in as far as every time I submit my form, I get an error. If I use the following

@DateTimeFormat(pattern="yyyy-MM-dd")
private java.util.Date startDate;

一切正常.但理想情况下，我想从属性文件中驱动模式.这可能吗?如果可能，正确的语法是什么?

everything works fine. But ideally, I'd like to drive the pattern from a properties file. Is this possible and if so, what's the correct syntax?

• 戴夫

推荐答案

我会使用 PropertySourcesPlaceholderConfigurer 读取我的系统属性.然后你可以使用这个语法来解析占位符:${prop.name}.

I would use PropertySourcesPlaceholderConfigurer to read my system properties. Then you can use this syntax to resolve placeholders : ${prop.name}.

您的注释文件应该像这样工作:

Your annotated filed should work like this then:

@DateTimeFormat(pattern = "${class.date.format}")
private java.util.Date startDate;

要在 xml 中为您的应用程序配置 PropertySourcesPlaceholderConfigurer，请尝试以下操作:

To configure your PropertySourcesPlaceholderConfigurer for your application in xml, try this:

<bean class="org.springframework.beans.factory.config.PropertySourcesPlaceholderConfigurer">
  <property name="location">
    <list>
      <value>classpath:myProps.properties</value>
    </list>
  </property>
  <property name="ignoreUnresolveablePlaceholders" value="true"/>
</bean>

或者，使用 JavaConfig:

Or, with JavaConfig:

@Bean
public static PropertySourcesPlaceholderConfigurer propertySourcesPlaceholderConfigurer() {
    //note the static method! important!!
    PropertySourcesPlaceholderConfigurer configurer = new PropertySourcesPlaceholderConfigurer();
    Resource[] resources = new ClassPathResource[] { new ClassPathResource("myProps.properties")};
    configurer.setLocations(resources);
    configurer.setIgnoreUnresolvablePlaceholders(true);
    return configurer;
}

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