How to configure properties in Spring for dynamic reading of files

Spring configuration file dynamically read properties

need:

In the configuration file

=${env}

Dynamic binding when packaged.

plan

1. Configure Enable Placeholder Replacement in File

 &lt;profiles&gt;
        &lt;!-- Local development --&gt;
        &lt;profile&gt;
            &lt;id&gt;dev&lt;/id&gt;
            &lt;properties&gt;
                &lt;env&gt;dev&lt;/env&gt;
            &lt;/properties&gt;
            &lt;activation&gt;
                &lt;activeByDefault&gt;true&lt;/activeByDefault&gt;
            &lt;/activation&gt;
        &lt;/profile&gt;
        &lt;!-- Other environments --&gt;
 &lt;/profiles&gt;
 &lt;build&gt;
        &lt;resources&gt;
            &lt;resource&gt;
                &lt;directory&gt;src/main/resources&lt;/directory&gt;
                &lt;filtering&gt;true&lt;/filtering&gt;
            &lt;/resource&gt;
        &lt;/resources&gt;
&lt;/build&gt;

Maven<filtering>The default value isfalse。
This means that when copying the resource file, Maven does not placeholder replacement (i.e. filter).

2. Configure in the configuration file=@env@or=${env}

3. Select the environment when packagingmvn clean package -Pprod

-P parameter is used to activate a specific configuration file (profile) in a Maven build

Custom placeholders

If you are worried about conflicts, you can customize the placeholder.

<build>
    <plugins>
        <plugin>
            <groupId></groupId>
            <artifactId>maven-resources-plugin</artifactId>
            <version>3.2.0</version>
            <configuration>
                <delimiters>
                    <delimiter>#{</delimiter>
                    <delimiter>}</delimiter>
                </delimiters>
                <useDefaultDelimiters>false</useDefaultDelimiters>
            </configuration>
   		</plugin>
    </plugins>
</build>

Summarize

The above is personal experience. I hope you can give you a reference and I hope you can support me more.