读取jar/war文件中的maven.properties文件 [英] Read maven.properties file inside jar/war file

问题描述

是否可以使用Java读取jar/war文件中文件(maven.properties)的内容?当不使用文件时(在内存中)，我需要从磁盘读取文件.有关如何执行此操作的任何建议?

Is there a way to read the content of a file (maven.properties) inside a jar/war file with Java? I need to read the file from disk, when it's not used (in memory). Any advise on how to do this?

关于， 约翰·基斯(Johan-Kees)

Regards, Johan-Kees

推荐答案

首先要解决的问题:从技术上讲，它不是文件. JAR/WAR是一个文件，您正在寻找的是归档文件中的一个条目(又称为资源).

One thing first: technically, it's not a file. The JAR / WAR is a file, what you are looking for is an entry within an archive (AKA a resource).

由于它不是文件，因此您需要将其作为InputStream

And because it's not a file, you will need to get it as an InputStream

1. 如果JAR/WAR位于 classpath，您可以执行SomeClass.class.getResourceAsStream("/path/from/the/jar/to/maven.properties")，其中SomeClass是JAR/WAR中的任何类

1. If the JAR / WAR is on the classpath, you can do SomeClass.class.getResourceAsStream("/path/from/the/jar/to/maven.properties"), where SomeClass is any class inside that JAR / WAR

// these are equivalent:
SomeClass.class.getResourceAsStream("/abc/def");
SomeClass.class.getClassLoader().getResourceAsStream("abc/def");
// note the missing slash in the second version

否则，您将必须像这样阅读JAR/WAR:

If not, you will have to read the JAR / WAR like this:

JarFile jarFile = new JarFile(file);
InputStream inputStream =
    jarFile.getInputStream(jarFile.getEntry("path/to/maven.properties"));

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现在您可能想将InputStream加载到Properties对象中

---

Now you probably want to load the InputStream into a Properties object:

Properties props = new Properties();
// or: Properties props = System.getProperties();
props.load(inputStream);

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或者您可以将InputStream读取为字符串.如果您使用类似

---

Or you can read the InputStream to a String. This is much easier if you use a library like

• Apache Commons/IO

String str = IOUtils.toString(inputStream)

Google番石榴

String str = CharStreams.toString(new InputStreamReader(inputStream));

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