Java 如何在 WAR 应用程序中读取 MANIFEST.MF？
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How to read MANIFEST.MF inside WAR application?
提问by yegor256
I would like to read MANIFEST.MFof my WARapplication. How can I find its file name?
我想阅读MANIFEST.MF我的WAR申请。我怎样才能找到它的文件名？
采纳答案by BalusC
How can I find its file name?
我怎样才能找到它的文件名？
You already have it. Maybe you meant to find the absolute file location? You can use ServletContext#getRealPath()for this.
你已经拥有了。也许你想找到绝对文件位置？您可以ServletContext#getRealPath()为此使用。
String relativeWARPath = "/META-INF/MANIFEST.MF";
String absoluteDiskPath = getServletContext().getRealPath(relativeWARPath);
File file = new File(absoluteDiskPath);
// ...
Or if you want to get it as InputStreamdirectly, use ServletContext#getResourceAsStream().
或者，如果您想InputStream直接获取它，请使用ServletContext#getResourceAsStream().
InputStream input = getServletContext().getResourceAsStream("/META-INF/MANIFEST.MF");
// ...
回答by yegor256
I had the same problem in every application and decided to create a component with a utility class in it: jcabi-manifests. Now it's easy to load any attribute from one of available MANIFEST.MFin classpath:
我在每个应用程序中都遇到了同样的问题，并决定创建一个包含实用程序类的组件：jcabi-manifests。现在可以很容易地从MANIFEST.MF类路径中的可用属性之一加载任何属性：
import com.jcabi.manifests.Manifests;
String value = Manifests.read("My-Version");
Also, check this out: http://www.yegor256.com/2014/07/03/how-to-read-manifest-mf.html
另外，看看这个：http: //www.yegor256.com/2014/07/03/how-to-read-manifest-mf.html
回答by wonhee
There are a few ways to do it, and the chosen answer is only works when you want to read Manifiest files on Servlet/SpringMVC layer or whatever layer you can access to ServletContext.
有几种方法可以做到这一点，所选择的答案仅在您想要读取 Servlet/SpringMVC 层或您可以访问 ServletContext 的任何层上的 Manifyingt 文件时才有效。
However, if you want to read a value like "version" even before Servlet starts up, like during logback configuration or something else, you might need to do some old-way classloading or Manifest file manipulation.
但是，如果您想在 Servlet 启动之前读取“version”之类的值，例如在 logback 配置或其他期间，您可能需要执行一些旧的类加载或 Manifest 文件操作。
I found this github repository(not mine) and it includes 4 different way to read information from Manifest file. If your situation is not accessible to ServletContext, check these out.
我找到了这个 github 存储库（不是我的），它包含 4 种从清单文件中读取信息的不同方式。如果 ServletContext 无法访问您的情况，请查看这些。
