java 如何从jar文件中获取java主类
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How to get java main class from jar file
提问by Yaz
I have an executable jar and i want to know the name of java main classfrom this jar
我有一个可执行的 jar，我想main class从这个 jar 中知道 java 的名称
My question are if there is a java cmdto get this from jar metadata ?
我的问题是是否java cmd可以从 jar 元数据中获取此信息？
回答by sauumum
You can use unix command :
unzip -p XXX.jar META-INF/MANIFEST.MF
您可以使用 unix 命令：
unzip -p XXX.jar META-INF/MANIFEST.MF
or you can use jar commad
jar tf XXX.jarand see the content of MANIFEST.MF.
或者您可以使用 jar 命令
jar tf XXX.jar并查看MANIFEST.MF.
回答by larsgrefer
Technically a jar file can contain more than one main class.
从技术上讲，一个 jar 文件可以包含多个主类。
When java executes a jar file, it looks in the META-INF/MANIFEST.MFfile inside the jar to find the entrypoint.
当java执行一个jar文件时，它会在META-INF/MANIFEST.MFjar内部的文件中查找入口点。
There is no direct command to get this information, but you can unpack the jar (it's just a zip file) and look into the manifest yourself.
没有直接命令来获取此信息，但您可以解压缩 jar（它只是一个 zip 文件）并自己查看清单。
More about the manifest: https://docs.oracle.com/javase/tutorial/deployment/jar/defman.html
有关清单的更多信息：https: //docs.oracle.com/javase/tutorial/deployment/jar/defman.html
More about application entrypoints: https://docs.oracle.com/javase/tutorial/deployment/jar/appman.html
有关应用程序入口点的更多信息：https: //docs.oracle.com/javase/tutorial/deployment/jar/appman.html
