自定義Maven插件功能

自定義maven插件

建立一個maven 項目

經過上述方式建立，會自動引入maven-plugin-api 依賴和打包方式；以下

<packaging>maven-plugin</packaging>

<dependency>
  <groupId>org.apache.maven</groupId>
  <artifactId>maven-plugin-api</artifactId>
  <version>2.0</version>
</dependency>

繼承 AbstractMojo 類，並重寫execute 方法，並添加註解

**
 * @goal com-doc  插件的標識
 * @phase compile 表示哪一個階段運行插件
 */
public class DocProduct extends AbstractMojo{ 
    public void execute()  {
        this.getLog().info("進入自定義插件");
     }
}

外部引用插件

<plugin>
    <groupId>cn.pl</groupId>
    <artifactId>common-doc</artifactId>
    <version>1.0-SNAPSHOT</version>
    <configuration>
        <classPath>${basedir}\target\classes</classPath>
        <libDir>${basedir}\target\${artifactId}\WEB-INF\lib</libDir>
        <basePackage>${basedir}\target/classes\cn\pl</basePackage>
        <targetFile>${basedir}\src\main\webapp\open-api.html</targetFile>
    </configuration>
    <executions>
        <execution>
            <phase>compile</phase>
            <goals>
                <goal>com-doc</goal>
            </goals>
        </execution>
    </executions>
</plugin>

<configuration> 節點的參數，能夠在繼承與AbstractMojo 的類中接受，須要添加註解,例如:
<execution> 子節點 
<phase>compile</phase> 表示運行在哪一個階段 
<goals> <goal>com-doc</goal> </goals> 表示插件的標識 同AbstractMojo 的子類註解保持一致。

自定義maven 插件已完結

掃描類

package cn.pl;

import org.apache.maven.plugin.AbstractMojo;
import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugin.MojoFailureException;

import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.net.URLClassLoader;
import java.net.URLStreamHandler;
import java.util.ArrayList;
import java.util.List;

/**
 * @goal com-doc
 * @phase compile
 */
public class DocProduct extends AbstractMojo{
    /**
     * @parameter expression="${classPath}"
     */
    private String classPath;
    /**
     * @parameter expression="${libDir}"
     */
    private String libDir;
    /**
     * @parameter expression="${basePackage}"
     */
    private String basePackage;
    /**
     * @parameter expression="${targetFile}"
     */
    private String targetFile;
    private URLClassLoader loader;

    public void execute() throws MojoExecutionException, MojoFailureException {
        this.getLog().info("進入自定義插件");

        try {
            String libDir = (new URL("file",null,new File(this.libDir).getCanonicalPath()+File.separator)).toString();
            String baseDir = (new URL("file",null,new File(this.classPath).getCanonicalPath()+File.separator)).toString();

            File libDirFile = new File(libDir.replaceAll("file",""));
            URLStreamHandler us = null;
            List<URL> libs = new ArrayList<URL>();
            if(null != libDirFile.listFiles()){
                for (File jar: libDirFile.listFiles()) {
                    libs.add(new URL(null,libDir+jar.getName(),us));
                }
            }
            libs.add(new URL(null,baseDir,us));

            loader = new URLClassLoader(libs.toArray(new URL[libs.size()]),Thread.currentThread().getContextClassLoader());

            File dir = new File(basePackage);

            List<Class<?>> classes = new ArrayList<Class<?>>();
            scanner(classes,dir);

            this.getLog().info(String.valueOf(classes.size()));
            for (Class clazz: classes) {
                this.getLog().info("-------------"+clazz.getName());
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * 掃面配置基礎類
     * @param dir
     * @return
     */
    public void scanner( List<Class<?>> classes,File dir){

        File[] files = dir.listFiles();
        for (File file: files) {
            if(file.isDirectory()){
                scanner(classes,file);
            }else {
                if (!file.getName().endsWith(".class")){
                    continue;
                }
                String path = file.getPath();
                String className = getClassName(path);
                try {
                    classes.add(Class.forName(className,true,loader));
                    this.getLog().info("加載進入的："+className);
                } catch (ClassNotFoundException e) {
                    e.printStackTrace();
                    continue;
                }
            }
        }
    }

    public String getClassName(String path){
        classPath = (classPath==null?"":classPath);
        String classDir = path.replaceAll("\\\\","/")
                .replaceAll(classPath.replaceAll("\\\\","/"),"")
                .replaceAll("/",".")
                .replaceAll("\\.class","");
        String className = classDir.substring(1,classDir.length());
        return className;
    }
}