java 如何将属性从 Powershell 传递给 jar？
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How to pass Properties to jar from Powershell?
提问by jgran
I've been using Powershell-1.0 for command line needs for a while, instead of cmd.exe. Unfortunately, there are still some caveats when using Java. I need to pass a property to a jar, like that:
我一直在使用 Powershell-1.0 来满足命令行需求，而不是 cmd.exe。不幸的是，在使用 Java 时仍有一些注意事项。我需要将一个属性传递给一个 jar，如下所示：
java -jar -Duser.language=en any.jar
This line works fine in cmd.exe, but not in Powershell as it searches for another jar:
此行在 cmd.exe 中工作正常，但在 Powershell 中无法正常工作，因为它会搜索另一个 jar：
Unable to access jarfile user.language=en
无法访问 jarfile user.language=en
Using quotes doesn't help.
使用引号没有帮助。
Is it doable in Powershell-1.0, or do I miss something in Java?
它在 Powershell-1.0 中是否可行，或者我是否遗漏了 Java 中的某些内容？
回答by Keith Hill
Take a look at my answer to this question. Note how you can use echoargs.exe to diagnose these sort of problems. Most likely the fix would be to quote the parameter e.g.:
看看我对这个问题的回答。请注意如何使用 echoargs.exe 来诊断此类问题。最有可能的解决方法是引用参数，例如：
java -jar "-Duser.language=en" any.jar
You can test that using echoargs (from PowerShell Community Extensions):
您可以使用 echoargs（来自PowerShell Community Extensions）进行测试：
echoargs -jar "-Duser.language=en" any.jar
Arg 0 is <-jar>
Arg 1 is <-Duser.language=en>
Arg 2 is <any.jar>
回答by mmuller
Using quotes works fine for me in PowerShell on Windows 7.
在 Windows 7 上的 PowerShell 中使用引号对我来说效果很好。
java "-Dmy.property=value" -jar myjar.jar
Be careful: the jar name must be placed right after -jar, and arguments placed after -jar myjar.jarwill be passed to the program insidethe jarFile.
注意：jar 名称必须紧跟在 之后-jar，放在之后的参数-jar myjar.jar将传递给jarFile内的程序。
回答by Adam Batkin
Try launching instead using the following pattern:
尝试使用以下模式启动：
java -Duser.language=en -jar any.jar
That assumes that user.language is meant as a system property. If you meant it as a command line argument, change that to:
假设 user.language 是系统属性。如果您将其作为命令行参数，请将其更改为：
java -jar any.jar -Duser.language=en
I am actually surprised that the command line you mentioned works at all outside of powershell (though I have confirmed that it works fine for me too, even on Linux) and it is also a little strange that things would work differently inside and outside of powershell.
我实际上很惊讶你提到的命令行在 powershell 之外完全有效（尽管我已经确认它对我来说也很好用，即使在 Linux 上也是如此）而且有点奇怪的是，在 powershell 内部和外部的工作方式不同.
From java -help:
来自java -help：
Usage: java [-options] class [args...]
(to execute a class)
or java [-options] -jar jarfile [args...]
(to execute a jar file)
where options include:
...
-D<name>=<value>
set a system property
...
So basically you should always put the JAR filename directly after the -jarcommand line option, and any JVM options (such as setting system properties with -D) before.
所以基本上你应该总是把 JAR 文件名直接放在-jar命令行选项之后，任何 JVM 选项（比如用 设置系统属性-D）之前。
