你可以简单地实现自己的 maven-plugin
,它将为您处理此事。
以下是具有以下结构的示例:
.
|-- pom.xml
|-- plugin
| `-- pom.xml
| `-- src
| `-- main
| `-- java
`-- app
`-- pom.xml
`-- src
`-- main
`-- java
你需要创建一个Mojo,将属性文件作为输入,并将属性传播到
app
的
pom.xml
中。实际上,
pom.xml
不会被更新,只是其中的项目数据会被更新。
pom.xml
。
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.stackoverflow</groupId>
<artifactId>Q12082277</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>pom</packaging>
<name>${project.artifactId}-${project.version}</name>
<modules>
<module>plugin</module>
<module>app</module>
</modules>
</project>
plugin/pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>com.stackoverflow</groupId>
<artifactId>Q12082277</artifactId>
<version>1.0-SNAPSHOT</version>
</parent>
<artifactId>Q12082277-plugin</artifactId>
<packaging>maven-plugin</packaging>
<name>${project.artifactId}-${project.version}</name>
<dependencies>
<dependency>
<groupId>org.apache.maven</groupId>
<artifactId>maven-plugin-api</artifactId>
<version>3.0.4</version>
</dependency>
<dependency>
<groupId>org.apache.maven</groupId>
<artifactId>maven-project</artifactId>
<version>2.2.1</version>
</dependency>
</dependencies>
</project>
plugin/src/main/java/com/stackoverflow/Q12082277/plugin/PropertiesMojo.java
package com.stackoverflow.Q12082277.plugin;
import org.apache.maven.plugin.AbstractMojo;
import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugin.MojoFailureException;
import org.apache.maven.plugin.logging.Log;
import org.apache.maven.project.MavenProject;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Properties;
public class PropertiesMojo extends AbstractMojo {
private Log log;
private MavenProject project;
private File propertiesFile;
@Override
public void execute() throws MojoExecutionException, MojoFailureException {
log.info("Executing PropertiesMojo on " + propertiesFile.getAbsolutePath());
try {
Properties fileProperties = new Properties();
fileProperties.load(new FileInputStream(propertiesFile));
Properties projectProperties = project.getProperties();
for (Object key : fileProperties.keySet()) {
projectProperties.setProperty((String)key, (String) fileProperties.get(key));
}
project.getProperties().list(System.out);
} catch (FileNotFoundException e) {
throw new MojoFailureException("The file " + propertiesFile.getAbsolutePath() + " was not found!", e);
} catch (IOException e) {
log.error("");
}
}
@Override
public void setLog(Log log) {
this.log = log;
}
}
您将从以下的
app/pom.xml
文件中使用此插件。
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>com.stackoverflow</groupId>
<artifactId>Q12082277</artifactId>
<version>1.0-SNAPSHOT</version>
</parent>
<artifactId>Q12082277-app</artifactId>
<name>${project.artifactId}-${project.version}</name>
<build>
<plugins>
<plugin>
<groupId>com.stackoverflow</groupId>
<artifactId>Q12082277-plugin</artifactId>
<version>1.0-SNAPSHOT</version>
<executions>
<execution>
<phase>initialize</phase>
<goals>
<goal>extract</goal>
</goals>
<configuration>
<propertiesFile>${user.home}/my.properties</propertiesFile>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.2.1</version>
<executions>
<execution>
<goals>
<goal>java</goal>
</goals>
</execution>
</executions>
<configuration>
<mainClass>com.stackoverflow.Q12082277.App</mainClass>
</configuration>
</plugin>
</plugins>
<resources>
<resource>
<directory>src/main/resources</directory>
<filtering>true</filtering>
</resource>
</resources>
</build>
</project>
然后你需要添加以下的app.properties
文件,它将作为一个模板来接收我们刚刚从文件中读取的值,并设置这些值并创建一个具体的app.properties
文件,该文件可从jar包内部访问。
app/src/main/resources/app.properties
res.dir=${res.dir}
resource.dir=${resource.dir}
bin.dir=${bin.dir}
cfg.dir=${cfg.dir}
最后,这里有一个测试应用程序,它只从类路径中加载app.properties
文件并打印结果。
app/src/main/java/com/stackoverflow/Q12082277/App.java
package com.stackoverflow.Q12082277;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
public class App {
public static void main(String[] args) throws IOException {
ClassLoader loader = App.class.getClassLoader();
InputStream in = loader.getResourceAsStream("app.properties");
Properties properties = new Properties();
properties.load(in);
properties.list(System.out);
}
}
现在您可以站在顶级目录并执行。
mvn install
接下来进入app
文件夹并执行命令。
mvn exec:java
它将打印
-- listing properties --
resource.dir=C://my/stuff/here
cfg.dir=C://my/stuff/here/config
bin.dir=C://my/stuff/here/bin
res.dir=/my/stuff/here
这正是你想要的。