ClassLoader bladeClassLoader = BladeCLI.class.getClassLoader(); URL url = bladeClassLoader.getResource("/libs/blade.jar"); JarURLConnection jarUrlConnection = (JarURLConnection)url.openConnection(); JarEntry jarEntry = jarUrlConnection.getJarEntry(); Long bladeJarTimestamp = jarEntry.getTime();
1. 先得到改Jar包的URL
2.然后通过JarUrlConnection得到JarEntry
3.然后再通过JarEntry得到时间戳
Note: 直接通过JarUrlConnection只能得到该Jar包的时间戳,不能得到其内嵌Jar包的时间戳。