Thinking about packaging once, can Maven still play like this?

A lying boy 2020-11-09 11:48:43
thinking packaging maven play


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Catalog

  • Preface
  • Dependency relationship
  • What would you do ?
  • The necessary parameters
  • summary

Preface

Yesterday, a reader came to me for my exchange work experience , An interesting question was mentioned by chance , as follows :

The general meaning is : The company has been working on Multiple modules Development , Because modules depend on each other , It's annoying to pack every time , You have to package them one by one according to the dependencies , Is there any way to save time ?

Actually, play around Maven Our friends all know , It takes only one command to solve the problem .

Dependency relationship

Suppose you have a multi module project , The parent project P It contains three sub modules ABC, The three modules have the following dependencies :

  1. A rely on BC.
  2. B rely on C.
 Dependency graph
Dependency graph

The parent project P Of pom.xml as follows :

.....
<modules>
 <module>A</module>
 <module>B</module>
 <module>C</module>
</modules>
.....

A Modular pom.xml as follows :

....
<dependency>
 <groupId>xxx.xxxx</groupId>
 <artifactId>B</artifactId>
 <version>xxxx</version>
</dependency>
.....

B Modular pom.xml as follows :

....
<dependency>
 <groupId>xxx.xxxx</groupId>
 <artifactId>C</artifactId>
 <version>xxxx</version>
</dependency>
.....

C Modular pom.xml as follows :

....

What would you do ?

Now the product needs to be launched A, How do you pack ?

The easiest thing to think of is to pack them separately , Execute the following commands respectively :

mvn clean install C
mvn clean install B
mvn clean package A

The above three modules are packaged in turn , It will take at least five minutes , Don't you panic ?

 A batch of panic
A batch of panic

The key is coming. , I just need to pack it :

mvn clean package -pl A -am -P test -DskipTests=true

Is there anything profound about the above order ?-P Specify the environment ,-DskipTests=true Skip the test , however -pl and -am What is it? ?

The answer must be -pl and -am These two parameters .

The necessary parameters

From the above example, we can see that the important thing is -pl and -am These two parameters , So what do you mean ? as follows :

Parameters explain
-pl Optional , Specify the project to be processed , Multiple are separated by commas , The value is artifactId
-am Optional , At the same time processing pl Parameters Specify the dependent modules of the module
-amd Optional , Simultaneous processing depends on pl Parameters The module of the specified module
-N Optional , Indicates that the submodule is not recursive

What about? , Do you understand ? Is it a little obscure , ha-ha ....

what?
what?

take it easy , Let's understand through a few commands ( All in the parent project P The root directory of the execution ).

  1. mvn clean install -pl A -am

To the father project P、 Sub module A as well as A Modules depend on BC Module execution mvn clean install operation .

After this command is executed successfully , You can see PABC All four modules are installed locally .

  1. mvn clean install -pl C -am

To the father project P、 Sub module C Module execution mvn clean install operation .

After this command is executed successfully , You can see PC Two modules are installed locally .

because C modular Do not rely on The other two sub modules , therefore AB The module does not execute the relevant commands .

  1. mvn clean install -pl C -amd

To the father project P、 Sub module C And rely on C Modular BC Module execution mvn clean install` operation .

After this command is executed successfully , You can see PABC All four modules are installed locally .

  1. mvn clean install -N

Only package the parent project P, Its submodules will not perform related operations .

What about? ? Through the above command, I should understand it .

summary

As the volume of the project grows , It's more than just a few of the above modules , Learn these commands , It's more than twice as efficient .

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