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What is the role of profiles in maven's pom.xml? I believe many inexperienced people don't know what to do about it. Therefore, this paper summarizes the causes and solutions of the problem. Through this article, I hope you can solve this problem.

1. What is profiles? What's the use?

All projects built in maven have a pom.xml project object model configuration file that is used to constrain the project (e.g. jar package management, build management, etc.). Profiles is a configuration item in pom.xml.

When we develop a project, we usually distinguish between the online environment and the test environment, which need to be switched to adapt to different environmental requirements.

The configuration of the formal environment is generally placed under src/main/resources, while the test environment is placed under / src/test/resources.

The main function of profile is to distinguish the configuration of formal environment and test environment.

2 、 How to configure release src/main/resources * * / * test Src/test/resources config/*.properties log4j.xml src/main/resources * * / .xml log4j.xml true

As above, I have configured two profile and one release for formal environment release and test for test environment use. Test environment is enabled by default, activation- > true

The test environment is only partially different from the formal environment, and we need to share this part of the configuration. This uses includes and excludes, bringing in and excluding configuration files

3. Differentiate the construction of release packages

Build the test package:

Maven package-P test-Dmaven.test.skip=true

Build the official package:

Maven package-P release-Dmaven.test.skip=truemaven multi-environment profiles parameter switching

In actual development projects, there are often several environments, and in general, there are at least three environments: development, testing, formal, and the parameters vary from environment to environment.

Therefore, when switching the environment, we need to modify the parameters needed by each environment, so we can simplify this step through the configuration of maven in the switching environment.

Project structure diagram

The src/main/resources/dev directory is a configuration project for the development environment

The src/main/resources/test directory is the configuration project for the test environment

Define the profile of the environment in pom.xml

Dev true dev test Test

If the value of the activeByDefault tag is true, it represents the default profile. What works with the mvn install command is the default profiles.activation to configure the activated profile for us.

SpringMVC_Spring_Mybatis ${basedir} / src/main/resources message.properties ${project.active} / * * ${basedir} / src/main/resources db.properties user .properties message.properties * / * * Org.apache.tomcat.maven tomcat7-maven-plugin 2.2 UTF-8 / 8088

Under the ${basedir} / src/main/resource directory of the project (basedir refers to the directory where the pom file is located)

And is used to delineate and exclude a file directory under the file is a project resource, specified in the resource file, the other is not, in addition to these are specified as resource files, if there is a conflict with the delineated scope, with the delimited scope shall prevail, when the same file specified, they will not be excluded, such as message.properties and specified at the same time, but they will still be compiled.

Enter maven instruction

Mvn clean install-P test

The compilation result is shown in the following figure, compiling only the configuration required by the test environment-the test after P is the profile we want to activate

After reading the above, have you mastered the role of profiles in maven's pom.xml? If you want to learn more skills or want to know more about it, you are welcome to follow the industry information channel, thank you for reading!

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