Maven2 plugin開(kāi)發(fā)教程詳解

更新時(shí)間：2017年06月28日 11:46:59 作者：Yakov

這篇文章主要為大家詳細(xì)介紹了Maven2 plugin的開(kāi)發(fā)教程，具有一定的參考價(jià)值，感興趣的小伙伴們可以參考一下

首先，創(chuàng)建項(xiàng)目，創(chuàng)建一個(gè)文件夾：mkdir yakov

進(jìn)入yakov目錄，然后創(chuàng)建一個(gè)pom.xml：touch pom.xml，這個(gè)xml文件的結(jié)構(gòu)會(huì)在另外的章節(jié)詳細(xì)說(shuō)一下。

使用vi編輯pom.xml，寫(xiě)入基本的項(xiàng)目信息，如下圖：

單單是這些還是不夠的，接下來(lái)需要，配置一些私服和集成。

注：上面的version改為3.0

有關(guān)的私服和集成服務(wù)在上一篇中寫(xiě)過(guò)：http://www.cnblogs.com/yakov/archive/2011/11/19/maven2_shi_jian.html

設(shè)置Maven從Nexus私服下載構(gòu)件

可以設(shè)置某個(gè)項(xiàng)目從私服下載，設(shè)置項(xiàng)目的pom.xml如下：

<project>
...
  <repositories>
    <repository>
      <id>nexus</id>
      <name>Nexus</name>
      <url>http://202.117.15.193:8010/nexus/content/groups/public/</url>
      <releases><enabled>true</enabled></releases>
      <snapshots><enabled>true</enabled></snapshots>
    </repository>
  </repositories>
  <pluginRepositories>
    <pluginRepository>
      <id>nexus</id>
      <name>Nexus</name>
      <url>http://202.117.15.193:8010/nexus/content/groups/public/</url>
      <releases><enabled>true</enabled></releases>
      <snapshots><enabled>true</enabled></snapshots>
    </pluginRepository>
  </pluginRepositories>
...
</project>

但是這需要為每個(gè)項(xiàng)目配置一下，有可能你僅僅需要為你開(kāi)發(fā)的所有項(xiàng)目都用這同一個(gè)私服，那么很好，settings.xml提供了profile來(lái)設(shè)置：

<settings>
  ...
  <profiles>
    <profile>
      <id>nexus</id>
      <repositories>
        <repository>
          <id>nexus</id>
          <name>Nexus</name>
          <url>http://202.117.15.193:8010/nexus/content/groups/public/</url>
          <releases><enabled>true</enabled></releases>
          <snapshots><enabled>true</enabled></snapshots>
        </repository>
      </repositories>
      <pluginRepositories>
        <pluginRepository>
          <id>nexus</id>
          <name>Nexus</name>
          <url>http://202.117.15.193:8010/nexus/content/groups/public/</url>
          <releases><enabled>true</enabled></releases>
          <snapshots><enabled>true</enabled></snapshots>
        </pluginRepository>
      </pluginRepositories>
    </profile>
  </profiles>
  <activeProfiles>
    <activeProfile>nexus</activeProfile>
  </activeProfiles>
  ...
</settings>

上面的配置是針對(duì)下載構(gòu)件的，如果所有的下載都從私服上進(jìn)行，就需要配置鏡像了！如下所示：

<settings>
  ...
  <mirrors>
    <mirror>
      <id>nexus</id>
      <mirrorOf>*</mirrorOf>
      <url>http://202.117.15.193:8010/nexus/content/groups/public/</url>
    </mirror>
  </mirrors>
  <profiles>
    <profile>
      <id>nexus</id>
      <repositories>
        <repository>
          <id>central</id>
          <url>http://central</url>
          <releases><enabled>true</enabled></releases>
          <snapshots><enabled>true</enabled></snapshots>
        </repository>
      </repositories>
      <pluginRepositories>
        <pluginRepository>
          <id>central</id>
          <url>http://central</url>
          <releases><enabled>true</enabled></releases>
          <snapshots><enabled>true</enabled></snapshots>
        </pluginRepository>
      </pluginRepositories>
    </profile>
  </profiles>
  <activeProfiles>
    <activeProfile>nexus</activeProfile>
  </activeProfiles>
  ...
</settings>

以上幾個(gè)任選一種就可以了，我這里使用了最后一種。

部署自己的構(gòu)件至Nexus

直接在要部署的項(xiàng)目的pom.xml中寫(xiě)入如下代碼:

還需要在settings.xml中設(shè)置用戶(hù)名和密碼，因?yàn)镹exus的倉(cāng)庫(kù)對(duì)于匿名用戶(hù)是readonly的：

至此，有關(guān)私服已經(jīng)設(shè)置好了！

在目錄src/main/java下編寫(xiě)plugin

在yakov下創(chuàng)建src/main/java目錄
寫(xiě)一個(gè)YakovMojo的類(lèi)：

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.apache.maven.model.Resource;
import org.apache.maven.plugin.AbstractMojo;
import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugin.MojoFailureException;
/**
 * 
 * @author org.omylab.yakov
 * @goal yakov
*/
public class YakovMojo extends AbstractMojo{
  private final String[] INCLUDES_DEFAULT={"java","xml","properties"};

  /**
   * @parameter expression="${project.basedir}"
   * @required
   * @readonly
*/
  private File basedir;
  /**
   * @parameter expression ="${project.build.sourceDirectory}"
   * @required
   * @readonly
*/
  private File sourceDirectory;
  /**
   * @parameter expression ="${project.biuld.testSourceDirectory}"
   * @required
   * @readonly
*/
  private File testSourceDirectory;
  /**
   * @parameter expression ="${project.build.resources}"
   * @required
   * @readonly
*/
  private List<Resource> resources;
  /**
   * @parameter expression "${project.build.testResources}"
   * @required
   * @readonly
*/
  private List<Resource> testResources;
  /**
   * The file types which will be included for counting
   *
   * @parameter
*/
  private String[] includes;
  public void execute() throws MojoExecutionException, MojoFailureException{
    if(includes==null||includes.length==0){
      includes=INCLUDES_DEFAULT;
    }
    try{
      countDir(sourceDirectory);
      countDir(testSourceDirectory);
      for(Resource resource:resources){
        countDir(new File(resource.getDirectory()));
      }
      for(Resource resource:testResources){
        countDir(new File(resource.getDirectory()));
      }
    }catch(IOException e){
      throw new MojoExecutionException("Unable to count lines of code.",e);
    }
  }
  
  private void countDir(File dir)throws IOException{
    if(!dir.exists())return;
    List<File> collected=new ArrayList<File>();
    collectFiles(collected,dir);
    int lines=0;
    for(File sourceFile:collected){
      lines+=countLine(sourceFile);
    }
    String path=dir.getAbsolutePath().substring(basedir.getAbsolutePath().length());
    getLog().info(path+" : "+lines+" lines of code in "+collected.size()+" files");
  }
  
  private void collectFiles(List<File> collected,File file){
    if(file.isFile()){
      for(String include:includes){
        if(file.getName().endsWith("."+include)){
          collected.add(file);
          break;
        }
      }
    }else{
      for(File sub:file.listFiles()){
        collectFiles(collected,sub);
      }
    }
  }
  private int countLine(File file)throws IOException{
    BufferedReader reader=new BufferedReader(new FileReader(file));
    int line =0;
    try{
      while(reader.ready()){
        reader.readLine();
        line++;
      }
    }finally{
      reader.close();
    }
    return line;
  }

}

然后運(yùn)行mvn clean compile，運(yùn)行結(jié)果如下：