在运行时获取jar版本 [英] Get jar version in runtime

问题描述

我想知道是否有可能在运行时检索来自该类的jar的版本号？

I'm wondering if it is possible to retrieve, in runtime, a version number of a jar from which the class comes from?

我知道它可以找到罐子从中类来自：。

I know its possible to find jar from which the class comes from:

MyClass.class.getProtectionDomain().getCodeSource().getLocation().getPath();

但版本怎么样？

（假设它不在文件名中:)）

(assuming its not in the file name:) )

推荐答案

import javax.mail.internet.InternetAddress;

/**
Display package name and version information for javax.mail.internet.
*/
public final class ReadVersion {
  public static void main(String... aArgs){
    ReadVersion readVersion = new ReadVersion();
    readVersion.readVersionInfoInManifest();
  }

  public void readVersionInfoInManifest(){
    InternetAddress object = new InternetAddress();
    Package objPackage = object.getClass().getPackage();
    //examine the package object 
    String name = objPackage.getSpecificationTitle();
    String version = objPackage.getSpecificationVersion();
    //some jars may use 'Implementation Version' entries in the manifest instead
    System.out.println("Package name: " + name);
    System.out.println("Package version: " + version);
  }
}

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