[英]How do I invoke a Java process from Windows Powershell?
I am having trouble running a Java program with Windows Powershell 2.0. 我在使用Windows Powershell 2.0运行Java程序时遇到问题。 Any help on this would be greatly appreciated.
任何有关这方面的帮助将不胜感激。 I want the string "Hello World!"
我想要字符串“Hello World!” to print to the main Powershell console window.
打印到Powershell主控制台窗口。 Instead, its getting printed to a separate process window that opens then suddenly closes.
相反,它被打印到一个单独的进程窗口然后突然关闭。 I don't know exactly how to tell the powershell to redirect the stdout of the spawned java process to the current powershell console.
我不知道如何告诉powershell将生成的java进程的stdout重定向到当前的PowerShell控制台。 Basically, i want behavior just like what I get when running java under a DOS shell.
基本上,我想要的行为就像我在DOS shell下运行java时所获得的那样。
My test class is: 我的测试类是:
class HelloWorldApp {
public static void main(String[] args) {
System.out.println("Hello World!"); //Display the string.
}
}
My PowerShell 2.0 code is this: 我的PowerShell 2.0代码是这样的:
set-item -path Env:CLASSPATH -value C:\Test
"CLASSPATH = $Env:CLASSPATH"
[Diagnostics.Process]::Start('java.exe','-classpath $Env:CLASSPATH C:\
Test\HelloWorldApp')
Alternatively, I tried to run it like so, as I would with a regular DOS shell, with the hope that the output shows in the same console : 或者,我尝试像这样运行它,就像我使用常规DOS shell一样,希望输出显示在同一个控制台中:
java.exe -classpath $Env:CLASSPATH C:\Test\HelloWorldApp
It causes an error. 它会导致错误。 I get this error:
我收到此错误:
PS >C:\Test\Test.ps1
CLASSPATH = C:\Test
java.exe : java.lang.NoClassDefFoundError: C:\Test\HelloWorldApp
At C:\Test\Site.ps1:3 char:5
+ java <<<< -classpath $Env:CLASSPATH C:\Test\HelloWorldApp
+ CategoryInfo : NotSpecified: (java.lang.NoCla...e\HelloWorldApp:
String) [], RemoteException
+ FullyQualifiedErrorId : NativeCommandError
Exception in thread "main"
As far as I can tell, my args are correct because here is what the PCEX ( http://pscx.codeplex.com ) echoargs cmdlet tells me: 据我所知,我的args是正确的,因为这是PCEX( http://pscx.codeplex.com )echoargs cmdlet告诉我的:
PS >echoargs java.exe -classpath $Env:CLASSPATH C:\Test\HelloWorldApp
Arg 0 is <java.exe>
Arg 1 is <-classpath>
Arg 2 is <C:\Test>
Arg 3 is <C:\Test\HelloWorldApp>
Im convinced there is a way to get this to work because this code works: 我相信有一种方法可以让它工作,因为这段代码有效:
## Test.ps1
cd C:\PSJustice
java.exe -classpath . HelloWorldApp
Also, this works: 此外,这有效:
cd C:\
java.exe -classpath C:\Test HelloWorldApp
I finally figured it out. 我终于弄明白了。 It was the smallest typo :
这是最小的拼写错误:
cd c:\
set-item -path Env:CLASSPATH -value C:\Test
"CLASSPATH = $Env:CLASSPATH"
java.exe -classpath $Env:CLASSPATH HelloWorldApp
When specifying the Class name it cannot include the absolute path prefixing the class name. 指定类名时,它不能包含前缀类名的绝对路径。 Oops.
哎呀。
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