DHorse系列文章之maven打包
插件打包
这种方式是平时最常用的，首先要下载并安装maven环境，然后在被打包的项目中引入插件，有各种各样的打包插件，比如springboot自带插件：
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<version>2.5.6</version>
<configuration>
<classifier>execute</classifier>
<mainClass>com.test.Application</mainClass>
</configuration>
<executions>
<execution>
<goals>
<goal>repackage</goal>
</goals>
</execution>
</executions>
</plugin>
再比如，通用的打包插件：
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<version>3.8.2</version>
<configuration>
<appendAssemblyId>false</appendAssemblyId>
<descriptors>
<descriptor>src/main/resources/assemble.xml</descriptor>
</descriptors>
<outputDirectory>../target</outputDirectory>
</configuration>
<executions>
<execution>
<id>make-assembly</id>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>
等等。然后再通过运行mvn clean package命令进行打包。
DHorse的技术选型
在《DHorse系列文章之镜像制作》这篇文章里已经说过，DHorse作为一个简单易用的DevOps开发平台，在一开始设计时就考虑到了对外部环境的依赖性。无论是从安装还是从使用的角度，都应该尽量减少对外部环境的依赖。
同样，打包时也应该去除对maven环境的依赖。那么，如何实现呢？
可以使用嵌入式maven插件maven-embedder来实现，首先在平台项目里引入依赖，如下：
<dependency>
<groupId>org.apache.maven</groupId>
<artifactId>maven-embedder</artifactId>
<version>3.8.1</version>
</dependency>
<dependency>
<groupId>org.apache.maven</groupId>
<artifactId>maven-compat</artifactId>
<version>3.8.1</version>
</dependency>
<dependency>
<groupId>org.apache.maven.resolver</groupId>
<artifactId>maven-resolver-connector-basic</artifactId>
<version>1.7.1</version>
</dependency>
<dependency>
<groupId>org.apache.maven.resolver</groupId>
<artifactId>maven-resolver-transport-http</artifactId>
<version>1.7.1</version>
</dependency>
运行如下代码，就可以对hello项目进行打包了：
String[] commands = new String[] { "clean", "package", "-Dmaven.test.skip" };
String pomPath = "D:/hello/pom.xml";
MavenCli cli = new MavenCli();
try {
cli.doMain(commands, pomPath, System.out, System.out);
} catch (Exception e) {
e.printStackTrace();
}
但是，一般情况下，我们通过maven的settings文件还会做一些配置，比如配置工作目录、nexus私服地址、Jdk版本、编码方式等等，如下：
<?xml version="1.0" encoding="UTF-8"?>
<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0 http://maven.apache.org/xsd/settings-1.0.0.xsd">
<localRepository>C:/m2/repository</localRepository>
<profiles>
<profile>
<id>myNexus</id>
<repositories>
<repository>
<id>nexus</id>
<name>nexus</name>
<url>https://repo.maven.apache.org/maven2</url>
<releases>
<enabled>true</enabled>
</releases>
<snapshots>
<enabled>true</enabled>
</snapshots>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>nexus</id>
<name>nexus</name>
<url>https://repo.maven.apache.org/maven2</url>
<releases>
<enabled>true</enabled>
</releases>
<snapshots>
<enabled>true</enabled>
</snapshots>
</pluginRepository>
</pluginRepositories>
</profile>
<profile>
<id>java11</id>
<activation>
<activeByDefault>true</activeByDefault>
<jdk>11</jdk>
</activation>
<properties>
<maven.compiler.source>11</maven.compiler.source>
<maven.compiler.target>11</maven.compiler.target>
<maven.compiler.compilerVersion>11</maven.compiler.compilerVersion>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.build.outputEncoding>UTF-8</project.build.outputEncoding>
</properties>
</profile>
</profiles>
<activeProfiles>
<activeProfile>myNexus</activeProfile>
</activeProfiles>
</settings>
通过查看MavenCli类发现，doMain(CliRequest cliRequest)方法有比较丰富的参数，CliRequest的代码如下：
package org.apache.maven.cli;
public class CliRequest
{
String[] args;
CommandLine commandLine;
ClassWorld classWorld;
String workingDirectory;
File multiModuleProjectDirectory;
boolean debug;
boolean quiet;
boolean showErrors = true;
Properties userProperties = new Properties();
Properties systemProperties = new Properties();
MavenExecutionRequest request;
CliRequest( String[] args, ClassWorld classWorld )
{
this.args = args;
this.classWorld = classWorld;
this.request = new DefaultMavenExecutionRequest();
}
public String[] getArgs()
{
return args;
}
public CommandLine getCommandLine()
{
return commandLine;
}
public ClassWorld getClassWorld()
{
return classWorld;
}
public String getWorkingDirectory()
{
return workingDirectory;
}
public File getMultiModuleProjectDirectory()
{
return multiModuleProjectDirectory;
}
public boolean isDebug()
{
return debug;
}
public boolean isQuiet()
{
return quiet;
}
public boolean isShowErrors()
{
return showErrors;
}
public Properties getUserProperties()
{
return userProperties;
}
public Properties getSystemProperties()
{
return systemProperties;
}
public MavenExecutionRequest getRequest()
{
return request;
}
public void setUserProperties( Properties properties )
{
this.userProperties.putAll( properties );
}
}
可以看出，这些参数非常丰富，也许可以满足我们的需求，但是CliRequest只有一个默认修饰符的构造方法，也就说只有位于org.apache.maven.cli包下的类才有访问CliRequest构造方法的权限，我们可以在平台项目里新建一个包org.apache.maven.cli，然后再创建一个类（如：DefaultCliRequest）继承自CliRequest，然后实现一个public的构造方法，就可以在任何包里使用该类了，如下代码：
package org.apache.maven.cli;
import org.codehaus.plexus.classworlds.ClassWorld;
public class DefaultCliRequest extends CliRequest{
public DefaultCliRequest(String[] args, ClassWorld classWorld) {
super(args, classWorld);
}
public void setWorkingDirectory(String directory) {
this.workingDirectory = directory;
}
}
定义好参数类型DefaultCliRequest后，我们再来看看打包的代码：
public void doPackage() {
String[] commands = new String[] { "clean", "package", "-Dmaven.test.skip" };
DefaultCliRequest request = new DefaultCliRequest(commands, null);
request.setWorkingDirectory("D:/hello/pom.xml");
Repository repository = new Repository();
repository.setId("nexus");
repository.setName("nexus");
repository.setUrl("https://repo.maven.apache.org/maven2");
RepositoryPolicy policy = new RepositoryPolicy();
policy.setEnabled(true);
policy.setUpdatePolicy("always");
policy.setChecksumPolicy("fail");
repository.setReleases(policy);
repository.setSnapshots(policy);
String javaVesion = "11";
Profile profile = new Profile();
profile.setId("java11");
Activation activation = new Activation();
activation.setActiveByDefault(true);
activation.setJdk(javaVesion);
profile.setActivation(activation);
profile.setRepositories(Arrays.asList(repository));
profile.setPluginRepositories(Arrays.asList(repository));
Properties properties = new Properties();
properties.put("java.home", "D:/java/jdk-11.0.16.2");
properties.put("java.version", javaVesion);
properties.put("maven.compiler.source", javaVesion);
properties.put("maven.compiler.target", javaVesion);
properties.put("maven.compiler.compilerVersion", javaVesion);
properties.put("project.build.sourceEncoding", "UTF-8");
properties.put("project.reporting.outputEncoding", "UTF-8");
profile.setProperties(properties);
MavenExecutionRequest executionRequest = request.getRequest();
executionRequest.setProfiles(Arrays.asList(profile));
MavenCli cli = new MavenCli();
try {
cli.doMain(request);
} catch (Exception e) {
e.printStackTrace();
}
}
如果需要设置其他参数，也可以通过以上参数自行添加。
