Java Windows 中的 JRE 安装目录
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JRE installation directory in Windows
提问by Ankur
Is there any command to check the active (since the machine can have more than 1 JRE installed) JRE installation directory under Windows. For linux, the corresponding command is
有没有什么命令可以查看windows下的active（因为机器可以安装1个以上的JRE）JRE安装目录。对于linux，对应的命令是
which java
Is there any Windows equivalent ?
是否有任何 Windows 等价物？
采纳答案by Ian Dallas
where javaworks for me to list all java exe but java -verbosetells you which rt.jaris used and thus which jre (full path):
where java适用于我列出所有 java exe，但会java -verbose告诉您rt.jar使用了哪个 jre（完整路径）：
[Opened C:\Program Files\Java\jre6\lib\rt.jar]
...
Edit: win7 and java:
编辑：win7 和 java：
java version "1.6.0_20"
Java(TM) SE Runtime Environment (build 1.6.0_20-b02)
Java HotSpot(TM) 64-Bit Server VM (build 16.3-b01, mixed mode)
回答by Ian Dallas
In the command line you can type java -version
在命令行中，您可以键入 java -version
回答by Michael Mao
回答by glob
Not as a command, but this information is in the registry:
不是作为命令，但此信息在注册表中：
- Open the key
HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Runtime Environment - Read the
CurrentVersionREG_SZ - Open the subkey under
Java Runtime Environmentnamed with theCurrentVersionvalue - Read the
JavaHomeREG_SZ to get the path
- 打开钥匙
HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Runtime Environment - 读取
CurrentVersionREG_SZ - 打开
Java Runtime Environmentnamed下的子CurrentVersion键值 - 读取
JavaHomeREG_SZ 以获取路径
For example on my workstation i have
例如在我的工作站上我有
HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Runtime Environment
CurrentVersion = "1.6"
HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Runtime Environment.5
JavaHome = "C:\Program Files\Java\jre1.5.0_20"
HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Runtime Environment.6
JavaHome = "C:\Program Files\Java\jre6"
So my current JRE is in C:\Program Files\Java\jre6
所以我目前的 JRE 在 C:\Program Files\Java\jre6
回答by glob
Following on from my other comment, here's a batch file which displays the current JRE or JDK based on the registry values.
继我的其他评论之后，这里有一个批处理文件，它根据注册表值显示当前的 JRE 或 JDK。
It's different from the other solutions in instances where java is installed, but not on the PATH.
在安装 java 的情况下，它与其他解决方案不同，但在PATH.
@ECHO off
SET KIT=JavaSoft\Java Runtime Environment
call:ReadRegValue VER "HKLM\Software\%KIT%" "CurrentVersion"
IF "%VER%" NEQ "" GOTO FoundJRE
SET KIT=Wow6432Node\JavaSoft\Java Runtime Environment
call:ReadRegValue VER "HKLM\Software\%KIT%" "CurrentVersion"
IF "%VER%" NEQ "" GOTO FoundJRE
SET KIT=JavaSoft\Java Development Kit
call:ReadRegValue VER "HKLM\Software\%KIT%" "CurrentVersion"
IF "%VER%" NEQ "" GOTO FoundJRE
SET KIT=Wow6432Node\JavaSoft\Java Development Kit
call:ReadRegValue VER "HKLM\Software\%KIT%" "CurrentVersion"
IF "%VER%" NEQ "" GOTO FoundJRE
ECHO Failed to find Java
GOTO :EOF
:FoundJRE
call:ReadRegValue JAVAPATH "HKLM\Software\%KIT%\%VER%" "JavaHome"
ECHO %JAVAPATH%
GOTO :EOF
:ReadRegValue
SET key=%2%
SET name=%3%
SET "%~1="
SET reg=reg
IF DEFINED ProgramFiles(x86) (
IF EXIST %WINDIR%\sysnative\reg.exe SET reg=%WINDIR%\sysnative\reg.exe
)
FOR /F "usebackq tokens=3* skip=1" %%A IN (`%reg% QUERY %key% /v %name% 2^>NUL`) DO SET "%~1=%%A %%B"
GOTO :EOF
