maven plugin 简单介绍和实战 (2021-05-29)

maven plugin 开发： https://maven.apache.org/plugin-developers/index.html

什么是plugin?

“Maven” is really just a core framework for a collection of Maven Plugins. In other words, plugins are where much of the real action is performed, plugins are used to: create jar files, create war files, compile code, unit test code, create project documentation, and on and on. Almost any action that you can think of performing on a project is implemented as a Maven plugin.

• plugin的作用

  1. create jar files (创建jar)
  2. create war files(创建war)
  3. compile code (编译源代码)
  4. unit test code (单元测试)
  5. create project documentation (创建项目文档)
  6. on and on（等等…）

什么是Mojo？

A Mojo is really just a goal in Maven, and plug-ins consist of any number of goals (Mojos). Mojos can be defined as annotated Java classes or Beanshell script. A Mojo specifies metadata about a goal: a goal name, which phase of the lifecycle it fits into, and the parameters it is expecting.

MOJO is a play on POJO (Plain-old-Java-object), substituting “Maven” for “Plain”. Mojo is also an interesting word (see definition). From Wikipedia, a “mojo” is defined as: “…a small bag worn by a person under the clothes (also known as a mojo hand). Such bags were thought to have supernatural powers, such as protecting from evil, bringing good luck, etc.”

mojo理解为一个执行目标，maven本身就是很多mojo组成的。mojo实现plugin，让用户自已在compile，process-classed,test,package,install, deploy等阶段实现特定的执行逻辑

maven plugin 的几个标准阶段

@Mojo的使用参考：https://maven.apache.org/developers/mojo-api-specification.html#The_Descriptor_and_Annotations

简单的定义plugin和使用plugin

如下就能简单的定义一个plugin的逻辑

package sample.plugin;
 
import org.apache.maven.plugin.AbstractMojo;
import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugins.annotations.Mojo;
 
/**
 * Says "Hi" to the user.
 *
 */
@Mojo( name = "sayhi")
public class GreetingMojo extends AbstractMojo
{
   
    public void execute() throws MojoExecutionException
    {
   
        getLog().info( "Hello, world." );
    }
}
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plugin的pom依赖

<dependencies>
  <!-- https://mvnrepository.com/artifact/org.apache.maven/maven-plugin-api -->
    <dependency>
        <groupId>org.apache.maven</groupId>
        <artifactId>maven-plugin-api</artifactId>
        <version>3.8.1</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.apache.maven.plugin-tools/maven-plugin-annotations -->
    <dependency>
        <groupId
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