Maven2 plugin开发教程详解
首先,创建项目,创建一个文件夹:mkdir yakov
进入yakov目录,然后创建一个pom.xml:touch pom.xml,这个xml文件的结构会在另外的章节详细说一下。
使用vi编辑pom.xml,写入基本的项目信息,如下图:
单单是这些还是不够的,接下来需要,配置一些私服和集成。
注:上面的version改为3.0
有关的私服和集成服务在上一篇中写过:http://www.cnblogs.com/yakov/archive/2011/11/19/maven2_shi_jian.html
设置Maven从Nexus私服下载构件
可以设置某个项目从私服下载,设置项目的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>
但是这需要为每个项目配置一下,有可能你仅仅需要为你开发的所有项目都用这同一个私服,那么很好,settings.xml提供了profile来设置:
<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>
上面的配置是针对下载构件的,如果所有的下载都从私服上进行,就需要配置镜像了!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>
以上几个任选一种就可以了,我这里使用了最后一种。
部署自己的构件至Nexus
直接在要部署的项目的pom.xml中写入如下代码:
还需要在settings.xml中设置用户名和密码,因为Nexus的仓库对于匿名用户是readonly的:
至此,有关私服已经设置好了!
在目录src/main/java下编写plugin
在yakov下创建src/main/java目录
写一个YakovMojo的类:
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; } }
然后运行mvn clean compile,运行结果如下:
编译完成,这里可移执行安装了,事实上,还应该有对应的测试代码,以后再讲。
运行mvn clean install完后就安装成功了。
最后运行mvn clean deploy 完成发布,查看Nexus如下:
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