springboot:在“additional-location”中的配置被“application-{profile}”覆盖。

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英文:

springboot: config in "additional-location" was overrided by "application-{profile}"

问题

以下是您要翻译的内容:

这是一个简单的Spring Boot项目,只有几个属性和一个MainClass

@Slf4j
@SpringBootApplication
public class DemoApplication {

    @Value("${test}")
    String test;

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }

    @PostConstruct
    public void print() {
        log.info(test);
    }
}

它只是打印变量test的值。

我在application.properties中配置了test

test=test normal

spring.profiles.active=dev

变量被application-dev.properties覆盖了:

test=test in dev

然后我运行了应用程序,它正常工作。它打印出:test in dev

接下来的问题是

我将应用程序打包成了一个jar,并且当我运行这个应用程序时,我想覆盖test,所以我编写了一个文件out.properties

test=test in out

通过以下命令启动应用程序:

java -jar target/demo.jar --spring.config.additional-location=out.properties

它仍然打印test in dev

我将命令更改为:

java -jar target/demo.jar --test="test in command"

它打印test in command

我已阅读文档:https://docs.spring.io/spring-boot/docs/current/reference/html/spring-boot-features.html#boot-features-external-config。
但我没有找到一些有用的提示。

我的目的是使用外部配置替换应用程序中的某些属性,这样我就不必更改源代码并重新打包。

感谢您的帮助!

英文:

It is a simple springboot project. only has a few properties and a MainClass:

@Slf4j
@SpringBootApplication
public class DemoApplication {

    @Value("${test}")
    String test;

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }

    @PostConstruct
    public void print() {
        log.info(test);
    }
}

It just print the value of variable test.

I configure test in application.properties:

test=test normal

spring.profiles.active=dev

The variable was overrided by application-dev.properties:

test=test in dev

Then I run the application, It works. It print: test in dev

The next thing is problem:

I package the application as a jar, and I want to override the test when I run this application, So I write a file out.properties:

test=test in out

Start the application by command

java -jar target/demo.jar --spring.config.additional-location=out.properties

It still prints test in dev!

I change the command to:

java -jar target/demo.jar --test="test in command"

It print test in command.

I have read the document: https://docs.spring.io/spring-boot/docs/current/reference/html/spring-boot-features.html#boot-features-external-config.
But I didn't find some useful tip.

My purpose is replace some property in application with a out config, so I don't have to change the source code and repackage.

Thanks for help!

答案1

得分: 2

链接的文档1明确列出了属性源的优先顺序

1-3. ...

  1. 命令行参数。

5-11. ...

  1. 打包的 JAR 文件之外的特定配置文件(application-{profile}.properties 和 YAML 变体)。

  2. 打包的 JAR 文件内的特定配置文件(application-{profile}.properties 和 YAML 变体)。

  3. 打包的 JAR 文件之外的应用配置文件(application.properties 和 YAML 变体)。

  4. 打包的 JAR 文件内的应用配置文件(application.properties 和 YAML 变体)。

16-17. ...

正如你的代码已经显示的那样,(4) --test="test in command" 会覆盖 (12-15) 配置文件中的任何内容。

你还可以看到,(12-13) 特定配置文件 总是会覆盖 (14-15) 非特定配置文件

因此,如果你希望外部文件覆盖 (13) 打包的 特定配置文件,那么你必须将该属性放在 (12) 外部 特定配置文件中。

但是,正如第 2.4 节 特定配置文件 中的说明:

> 如果在 spring.config.location 中指定了任何文件,则不会考虑文件的特定配置变体。如果您希 望还使用特定配置属性,请在 spring.config.location 中使用目录

换句话说,spring.config.location 中列出的任何文件都是(14)应用配置文件,无论其命名方式如何,因此(12-13)的特定配置文件都会覆盖它们,无论是(13)打包的还是(12)外部的。

总结:test=test in out 属性移动到位于 --spring.config.additional-location 路径中的一个名为 application-dev.properties目录中。

英文:

The linked documentation specifically lists the priority order of property sources:

1-3. ...

  1. Command line arguments.

5-11. ...

  1. Profile-specific application properties outside of your packaged jar (application-{profile}.properties and YAML variants).

  2. Profile-specific application properties packaged inside your jar (application-{profile}.properties and YAML variants).

  3. Application properties outside of your packaged jar (application.properties and YAML variants).

  4. Application properties packaged inside your jar (application.properties and YAML variants).

16-17. ...

As your code already showed you, (4) --test="test in command" overrides anything in (12-15) property files.

You can also see that (12-13) profile-specific application property files always override (14-15) non-profile application property files.

So, if you want an external file to override a (13) packaged profile-specific application property file, then you must place that property in a (12) external profile-specific application property file.

But, as the note in section 2.4. Profile-specific Properties says:

> If you have specified any files in spring.config.location, profile-specific variants of those files are not considered. Use directories in spring.config.location if you want to also use profile-specific properties.

Said another way, any file listed in spring.config.location is by definition a (14) application property file, regardless of how it is named, so (12-13) profile-specific application property files will override them, whether (13) packaged or (12) external.

Summary: Move the test=test in out property to an application-dev.properties file in a directory listed in the --spring.config.additional-location path.

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  • 本文由 发表于 2020年8月20日 10:57:08
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