在Maven配置文件中使用properties标记 [英] Using the properties tag within maven profiles

问题描述

我指的是" Maven:完整参考"，尤其是有关配置文件的部分，该部分在此处记录了在<profile...标记内使用<properties...标记的情况:请参阅此处

I am in reference to "Maven: The Complete Reference" and especially the section regarding profiles which documents the use of a <properties... tag within the <profile... tag here: see here

 <profile>
            <id>development</id>
            <activation>
                <activeByDefault>true</activeByDefault>
                <property>
                    <name>environment.type</name>
                    <value>dev</value>
                </property>
            </activation>
            <properties>
                <database.driverClassName>com.mysql.jdbc.Driver</database.driverClassName>
                <database.url>
                    jdbc:mysql://localhost:3306/app_dev
                </database.url>
                <database.user>development_user</database.user>
                <database.password>development_password</database.password>
            </properties>
        </profile>

我不确定运行mvn install -Denvironment.type=dev命令时会发生什么:

What I am not sure about is what happens when the mvn install -Denvironment.type=dev command is run:

• 这会创建一个.properties文件吗?
• 如果不是这样，那么在开发人员中测试该应用程序时，tomcat(例如)将如何以及在何处读取各个属性?

• Will this create a .properties file?
• If not how and where will tomcat (for instance) read the individual properties when the app is tested in dev?

推荐答案

这会创建一个.properties文件吗?

Will this create a .properties file?

不，不会.这将设置maven使用的属性.也就是说，对于mvn install -Denvironment.type=development，maven会将变量"database.user"(可以在poms和过滤的资源中用作$ {database.user}的变量)使用值"development_user".

No, it won't. This would set the properties used by maven. This is, with mvn install -Denvironment.type=development maven would use the value 'development_user' for the variable 'database.user' (that you can use as ${database.user} in poms and filtered resources).

如果没有，例如，当在开发人员中测试该应用程序时，tomcat将如何(例如)在何处读取各个属性?

If not how and where will tomcat (for instance) read the individual properties when the app is tested in dev?

要做的是告诉Maven根据配置文件(properties.files)来过滤(和修改)您要自定义的资源.

The thing is to tell maven to filter (and modify) the resources that you want to customize depending on the profile (properties.files).

因此，首先您必须说maven来过滤资源:

So, first you have to say maven to filter the resources:

<build>
    <resources>
        <resource>
             <directory>src/main/resources</directory>
             <filtering>true</filtering>
        </resource>
    </resources> 
</build>

然后修改您的属性文件以使用maven变量.例如，您的数据库属性文件如下所示:

Then modify your properties files to use maven variables. For example, your db properties file would look like this:

database.driverClassName=${database.driverClassName}
database.url=${database.url}
#...

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