无法使用@Value在Spring应用程序中获取Maven project.version属性 [英] Cannot get maven project.version property in a Spring application with @Value

问题描述

如何在带有@Value批注的Spring Boot应用程序中获取maven project.version属性?

How to get the maven project.version property in a Spring Boot application with a @Value annotation?

推荐答案

在对如何在SpringBoot应用程序中获取Maven项目版本进行了一些研究和试验之后，我找不到适合我的任何东西.

After some research and trials on how to get the Maven project version in a SpringBoot application I couldn't find anything working for me.

由于类加载器的问题，使用清单肯定是一条烂路，即，一个清单是Spring发现的第一个清单，在我的情况下不是我的应用程序.

Using a manifest is definitively a rotten path due to class loaders issues, i.e. one gets the first manifest Spring finds, which in my case was not the one of my application.

我发现的一个解决方案是使用Maven资源插件来过滤"(替换)资源文件中的属性.在这种情况下，Spring application.properties.

One solution I have found is to use the maven resources plugin to "filter" (replace) properties in resource files. In this case the Spring application.properties.

下面是完成这项工作的步骤.

Below are the steps to make this work.

在pom文件中，使用以下定义激活资源过滤:

In the pom file, activate resources filtering with the following definition:

<resources>
    <resource>
        <filtering>true</filtering>
        <directory>src/main/resources</directory>
        <includes>
            <include>application.properties</include>
        </includes>
    </resource>
</resources>

在application.properties文件中:

application.name=@project.artifactId@
build.version=@project.version@
build.timestamp=@timestamp@

注意application.properties文件中的@ property @而不是$ {property}..

Notice the @property@ instead of ${property}. in the application.properties file.

spring-boot-starter-parent pom将标准${}分隔符重新定义为@:

The spring-boot-starter-parent pom redefines the standard ${} delimiter as @:

<resource.delimiter>@</resource.delimiter>
<!-- delimiter that doesn't clash with Spring ${} placeholders -->
<delimiters>
    <delimiter>${resource.delimiter}</delimiter>
</delimiters>

然后可以使用@Value这样在Spring中访问这些属性:

One can then access those properties in Spring using @Value like this:

@Value("${application.name}")
private String applicationName;

@Value("${build.version}")
private String buildVersion;

@Value("${build.timestamp}")
private String buildTimestamp;

此处提供了示例项目.

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