如何在运行时编辑maven POM？

Question

我需要在运行时编辑POM。我用Dom4j读取pom，然后设置一些数据。但我需要知道是否存在另一种形式来做到这一点。存在一个Maven实用程序？

Answer 1

根据你的变化，可能会有maven插件。例如，maven release插件更新pom.xml中的版本信息并检查更改为版本控制。

尝试搜索您要完成的特定任务（例如“maven插件版本号更新”），而不是更通用的“修改pom.xml”。

Answer 2

使用MavenXpp3Reader来读取并且MavenXpp3Writer来写Model对象。简单的例子：

String baseDir = "/your/project/basedir/"; 

//Reading 
MavenXpp3Reader reader = new MavenXpp3Reader(); 
Model model = reader.read(new FileInputStream(new File(baseDir, "/pom.xml"))); 

//Editing 
model.setUrl("http://stackoverflow.com"); 

//Writing 
MavenXpp3Writer writer = new MavenXpp3Writer(); 
writer.write(new FileOutputStream(new File(baseDir, "/pom.xml")), model); 

并注意到任何评论，额外的空白或行将被从文件中删除。

Answer 3

此代码的工作对我来说：

package or.jrichardsz; 

import java.io.FileReader; 
import java.io.FileWriter; 
import java.io.Writer; 

import org.apache.maven.model.Model; 
import org.apache.maven.model.Plugin; 
import org.apache.maven.model.io.xpp3.MavenXpp3Reader; 
import org.apache.maven.model.io.xpp3.MavenXpp3Writer; 

public class TestMavenPomEdit { 

    public static void main(String[] args) throws Exception { 

     //read initial pom 
     Model model = parsePomXmlFileToMavenPomModel("C:\\Users\\User\\Desktop\\initial_pom.xml"); 

     //add some pom modification 
     Plugin plugin = new Plugin(); 
     plugin.setGroupId("com.jelastic"); 

     model.getBuild().addPlugin(plugin); 

     //write new pom 
     parseMavenPomModelToXmlString("C:\\Users\\User\\Desktop\\final_pom.xml", model); 

    } 

    public static Model parsePomXmlFileToMavenPomModel(String path) throws Exception { 

     Model model = null; 
     FileReader reader = null; 
     MavenXpp3Reader mavenreader = new MavenXpp3Reader(); 
     reader = new FileReader(path); 
      model = mavenreader.read(reader); 
     return model; 

    } 

    public static void parseMavenPomModelToXmlString(String path,Model model) throws Exception { 
     MavenXpp3Writer mavenWriter = new MavenXpp3Writer(); 
     Writer writer = new FileWriter(path); 
     mavenWriter.write(writer, model); 
    }  

} 

TestMavenPomEdit.java

HTH