如何在 Windows 批处理文件中获取 Java 程序的退出状态
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How to get the exit status of a Java program in Windows batch file
提问by pugmarx
Analogous to the $?in Linux, is there a way to get the exit status of a program in a Windows batch file (.bat)?
Say for example the program has a System.exit(0)upon successful execution, and a System.exit(1)upon a failure, how do I trap these exit values in a .batfile?
与$?Linux 中的类似，有没有办法在 Windows 批处理文件 ( .bat) 中获取程序的退出状态？
例如，程序System.exit(0)在成功执行System.exit(1)时有一个，在失败时有一个，我如何将这些退出值捕获到.bat文件中？
采纳答案by Matthew Flaschen
Use %ERRORLEVEL%. Don't you love how batch files are clear and concise? :)
使用%ERRORLEVEL%。您不喜欢批处理文件的简洁明了吗？:)
回答by Jon Skeet
Something like:
就像是：
java Foo
set exitcode=%ERRORLEVEL%
echo %exitcode%
It's important to make this the absolute next line of the batch file, to avoid the error level being overwritten :)
将其作为批处理文件的绝对下一行很重要，以避免错误级别被覆盖:)
Note that if you use the
请注意，如果您使用
IF ERRORLEVEL number
"feature" of batch files, it means "if the error level is greater than or equal to number" - it's not based on equality. I've been bitten by that before now :)
批处理文件的“特征”，这意味着“如果错误级别大于或等于number” - 它不是基于相等性。我以前被那个咬过:)
回答by dfa
Most of the usual external command operations return ERRORLEVEL0 and this usually (but NOT invariably) indicates that no error was encountered:
大多数常用的外部命令操作返回ERRORLEVEL0，这通常（但并非总是）表示没有遇到错误：
c:\> dir
...
c:\> echo %ERRORLEVEL%
回答by JesperE
Raymond Chen has a good blog post named ERRORLEVEL is not %ERRORLEVEL%. Worth checking out.
Raymond Chen 有一篇名为ERRORLEVEL is not %ERRORLEVEL%的好博文。值得一试。
Also worth noting is that the REM command which most people think of as comments, really aren't. The REM command is a nop command which always succeeds. After a REM, the error level is always 0. So
另外值得注意的是，大多数人认为是注释的 REM 命令实际上不是。REM 命令是一个总是成功的 nop 命令。在 REM 之后，错误级别始终为 0。所以
willalwaysfail.bat
REM unless you insert a comment after it
if errorlevel 1 goto fail
will never fail...
永远不会失败...
回答by user85421
mostly answering bulgar's question, but complementing the other answers:
主要回答bulgar的问题，但补充了其他答案：
for %ERRORLEVEL% to work you need to have the command extensionsactivated in Windows (it's the default).
For one session:
要使 %ERRORLEVEL% 工作，您需要在 Windows 中激活命令扩展（这是默认设置）。
对于一个会话：
cmd /E:on
or permanently in the registry
或永久在注册表中
HKEY_LOCAL_MACHINE\Software\Microsoft\Command Processor\EnableExtensions = 0x01
for more details:
更多细节：
cmd /?
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