如何从批处理脚本检查 Java 安装？
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How to check Java installation from batch script?
提问by Ma99uS
I need to write a batch script to find out if Java is installed, and if it is, then under what path? I feel it has to be something similar to this:
我需要写一个批处理脚本来找出是否安装了Java，如果是，那么在什么路径下？我觉得它必须与此类似：
for /f %%j in ("java.exe") do (
set JAVA_HOME=..........
)
but I can not figure it out.
但我想不通。
P.S. It has to work with path with spaces two. Like if java is installed into "Program Files".
PS 它必须与带有空格两个的路径一起使用。就像 java 安装到“程序文件”中一样。
Thanks.
谢谢。
回答by Photodeus
Using reg[.exe] you can query possible JRE candidates that are installed on the system. There could be none or could be several.
使用 reg[.exe] 您可以查询系统上安装的可能的 JRE 候选对象。可能没有，也可能有几个。
On a test set-up, running inside the command shell:
在测试设置中，在命令外壳内运行：
reg query "HKLM\Software\JavaSoft\Java Runtime Environment"
reg query "HKLM\Software\JavaSoft\Java Runtime Environment"
I get three result lines, of which the first is
CurrentVersion REG_SZ 1.6
我得到三个结果行，其中第一个是
CurrentVersion REG_SZ 1.6
Based on that, querying
基于此，查询
reg query "HKLM\Software\JavaSoft\Java Runtime Environment.6\"
Gives me JavaHome REG_SZ C:\Program Files\Java\jre6
给我 JavaHome REG_SZ C:\Program Files\Java\jre6
It's much more efficient than scan a file system to find a java binary.
这比扫描文件系统以查找 Java 二进制文件要高效得多。
This was tested under a virtual installation of Windows XP 32-bit.
这是在 Windows XP 32 位虚拟安装下测试的。
回答by javamonkey79
Couldn't you use the 'where' command? As in:
你不能使用'where'命令吗？如：
>where java
And test against this?
并对此进行测试？
Example:
例子：
C:\Users\myname>where java
C:\Program Files (x86)\Java\jdk1.6.0_17\bin\java.exe
C:\Users\myname>where foo
INFO: Could not find files for the given pattern(s).
回答by JamesG
回答by Federico Destefanis
I would (using batch)
我会（使用批处理）
::get javaw.exe from the latest properly installed jre
for /f tokens^=2^ delims^=^" %%i in ('reg query HKEY_CLASSES_ROOT\jarfile\shell\open\command /ve') do set JAVAW_PATH=%%i
::if reg entry is not found, java is not installed
if "%JAVAW_PATH%"=="" goto YOUR_ERROR
::then strip "\javaw.exe" from the JAVAW_PATH obtained above
set JAVA_HOME=%JAVAW_PATH:\javaw.exe=%
This should work with jre 1.6 and 1.7 installed in windows xp and seven and be way more faster than searching the filesystem.
这应该适用于安装在 windows xp 和 7 中的 jre 1.6 和 1.7，并且比搜索文件系统要快得多。
