Java-如何列出依赖项 [英] Java - How to list the dependencies

问题描述

我希望我的Java程序先记录依赖项.我知道mvn dependency:tree命令，但是创建的Jar文件将不会在具有Maven的计算机上执行.

I want my Java program to log the dependencies before anything. I am aware of the mvn dependency:tree command, but the Jar file created will not be executed on a computer with Maven.

在程序执行过程中如何获取依赖项列表?

How could we get the dependencies list during the execution of the program ?

推荐答案

您可以编写自己的parser，因此可以定义自定义格式.

You could just write your own parser, so you can define your custom formatting.

一个非常基本的(仅使用jdk内置库)可能看起来像这样:

A very basic one (using only jdk built-in libraries) might look like this:

import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
import javax.xml.parsers.DocumentBuilder;
// other imports...

public static void printPomDependencies() throws IOException, SAXException, ParserConfigurationException {
    // pom relative to your project directory
    final File pomFile = new File("./pom.xml");

    DocumentBuilder dBuilder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
    Document doc = dBuilder.parse(pomFile);
    doc.getDocumentElement().normalize();
    final NodeList dependencyNodes = doc.getElementsByTagName("dependency");

    for (int i = 0; i < dependencyNodes.getLength(); i++) {
        final Node n = dependencyNodes.item(i);

        final NodeList list = n.getChildNodes();

        System.out.println("----------------------------------");
        for (int j = 0; j < list.getLength(); j++) {
            final Node n2 = list.item(j);
            // do not print empty text nodes or others...
            if (n2.getNodeType() != Node.ELEMENT_NODE) continue;


            System.out.println(n2.getNodeName() + ":" + n2.getTextContent());

        }
    }
} 

例如，此解析器将输出以下输出:

For instance this parser prints the following output:

----------------------------------
groupId:io.spring.platform
artifactId:platform-bom
version:Brussels-SR6
type:pom
scope:import
----------------------------------
groupId:org.springframework.boot
artifactId:spring-boot-starter-web
----------------------------------
groupId:org.springframework
artifactId:spring-context
version:5.0.2.RELEASE
----------------------------------
groupId:org.springframework.data
artifactId:spring-data-jpa
version:2.0.2.RELEASE

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