Java JAR - 提取特定文件
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JAR - extracting specific files
提问by user3521479
I have .class and .java files in JAR archive. Is there any way to extract only .java files from it? I've tried this command but it doesn't work:
我在 JAR 存档中有 .class 和 .java 文件。有没有办法只提取 .java 文件？我试过这个命令，但它不起作用：
jar xf jar-file.jar *.java
采纳答案by Pierre Rust
You can use the unzipcommand which accepts wildcards in its arguments (which is not the case of the jarcommand). Something like this should do the trick ( disclaimer : not tested)
您可以使用unzip在其参数中接受通配符的命令（该jar命令不是这种情况）。这样的事情应该可以解决问题（免责声明：未经测试）
unzip youFile.jar "*.java"
回答by Anders R. Bystrup
From the source:
从来源：
To extract only certain files from a jar file, supply their filenames:
C:\Java> jar xf myFile.jar foo bar
要仅从 jar 文件中提取某些文件，请提供它们的文件名：
C:\Java> jar xf myFile.jar foo bar
Using wildcards is a shell thing, and you should not expect it to work when extractingfrom a JAR file (which, as you've realized, is the case).
使用通配符是 shell 的事情，在从 JAR 文件中提取时，您不应该期望它起作用（正如您已经意识到的那样）。
What you cando, is supply a list of the files you want to extract, via the @modifier:
您可以做的是通过@修饰符提供要提取的文件列表：
jar xf my.jar @myfiles.lst
where myfiles.lstwould be:
在哪里myfiles.lst：
com/my/MyClass.java
com/my/MySecondClass.java
This file could easily be created automatically with creative use of jar tvf, awkand your desired extraction pattern. I'll leave that as an exercise and/or another SO question :-)
通过创造性地使用和您想要的提取模式jar tvf，可以轻松地自动创建此文件awk。我将把它作为练习和/或另一个 SO 问题:-)
Or you could use unzip- a JAR file is basically a zip-file.
或者您可以使用unzip- JAR 文件基本上是一个 zip 文件。
Cheers,
干杯，
回答by Adrian Ng
There shouldn't be any *.java files in a jar, only class files. You can check the content of the jar first by running:
jar 中不应该有任何 *.java 文件，只有类文件。您可以先通过运行来检查 jar 的内容：
jar tvf jar-file.jar
