maven自定义插件

例子插件工程https://github.com/zhuquanwen/mvn-plugin.git
例子调用插件工程

创建一个Maven项目，具体怎么创建略。
将pom.xml文件的packaging 改为maven-plugin
```
<packaging>maven-plugin</packaging>
```

pom.xml中引入插件依赖

<dependencies>
        <dependency>
            <groupId>org.apache.maven.plugin-tools</groupId>
            <artifactId>maven-plugin-annotations</artifactId>
            <version>3.5.2</version>
        </dependency>
        <dependency>
            <groupId>org.apache.maven</groupId>
            <artifactId>maven-plugin-api</artifactId>
            <version>3.5.4</version>
        </dependency>
    </dependencies>

定义一个类继承AbstractMojo,实现excute方法

public class ZqwMojo extends AbstractMojo {
    public void execute() throws MojoExecutionException, MojoFailureException {
        System.out.println("我自定义的插件lalalalala!!!!!!!!!!!!!!!!");
    }
}

在上面的类上定义Mojo注解，name代表goal,defaultPhase是默认的phase
```
@Mojo(name = "zqw", defaultPhase = LifecyclePhase.PACKAGE)
```
运行mvn clean install 将插件安装到本地仓库，当然也可以deploy到私服

新建一个模块或工程，pom.xml中引入刚才自定义的插件

 <build>
        <plugins>
            <plugin>
                <groupId>com.zqw</groupId>
                <artifactId>maven-plugin-demo</artifactId>
                <version>1.0-SNAPSHOT</version>
            </plugin>
        </plugins>
    </build>

刷新maven或发现在新定义的模块或工程中，有了我们自定义的插件。

运行会发现有了我们刚才System.out.println的输出

现在这个简单的插件就算完成了，当运行demo:zqw时运行package 这个phase，并输出内容。但是当我们运行mvn package的时候是不会输出的。如果想让package的时候也行我们的插件，要配置如下：

	<build>
	        <plugins>
	            <plugin>
	                <groupId>com.zqw</groupId>
	                <artifactId>maven-plugin-demo</artifactId>
	                <version>1.0-SNAPSHOT</version>
	                <executions>
	                    <execution>
	                        <phase>package</phase>
	                        <goals>
	                            <goal>zqw</goal>
	                        </goals>
	                    </execution>
	                </executions>
	            </plugin>
	        </plugins>
	    </build>
	```

这样运行package就会输出我们的内容了

向插件中传入参数，在插件类处定义@Paramater

```
@Parameter
    private String msg;
    public void execute() throws MojoExecutionException, MojoFailureException {
        System.out.println(msg);
        System.out.println("共有Java文件数目:" + javaCount());
    }
```

在调用处配置参数

```
 <build>
        <plugins>
            <plugin>
                <groupId>com.zqw</groupId>
                <artifactId>mvn-plugin</artifactId>
                <version>1.0-SNAPSHOT</version>
                <configuration>
                    <msg>lalalalalalala</msg>
                </configuration>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>count</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
```

插件中传入一个集合参数
在将@Parameter用集合接收后出现问题
```
 Execution default-descriptor of goal org.apache.maven.plugins:maven-plugin-plugin:3.2:descriptor failed: 52264
```
升级一下maven-plugin-plugin的版本就好了

<build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                    <encoding>UTF-8</encoding>
                </configuration>
            </plugin>

            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-plugin-plugin</artifactId>
                <version>3.5.2</version>
            </plugin>
        </plugins>
    </build>

这样就可以定义List的参数了

```
@Parameter(property = "options")
private String[] options;
public void execute() throws MojoExecutionException, MojoFailureException {
    System.out.println(msg);
    if (options != null) Arrays.stream(options).forEach(System.out::println);
    System.out.println("共有Java文件数目:" + javaCount());
}
```

调用处

<build>
        <plugins>
            <plugin>
                <groupId>com.zqw</groupId>
                <artifactId>mvn-plugin</artifactId>
                <version>1.0-SNAPSHOT</version>
                <configuration>
                    <msg>lalalalalalala</msg>
                    <options>
                        <option>111</option>
                        <option>222</option>
                        <option>333</option>
                        <option>444</option>

                    </options>
                </configuration>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>count</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

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