如何檢測Java是通過REGEDIT.exe從批處理文件安裝的？

Question

我正在查找以某種方式讀取Windows註冊表並檢測Windows系統上的哪個Java JDK的批處理文件片段，然後詢問用戶要使用哪一個並記住該選項。

這是我到目前爲止...需要一些修改。該腳本僅查找第一個JDK ...它不處理倍數。

@echo off 
SETLOCAL EnableDelayedExpansion 
:: findJDK.bat 
start /w regedit /e reg1.txt "HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Development Kit" 
type reg1.txt | find "JavaHome" > reg2.txt 
if errorlevel 1 goto ERROR 
for /f "tokens=2 delims==" %%x in (reg2.txt) do (
    set JavaTemp=%%~x 
    echo Regedit: JAVA_HOME path : !JavaTemp! 
) 
if errorlevel 1 goto ERROR 
echo. 
set JAVA_HOME=%JavaTemp% 
set JAVA_HOME=%JAVA_HOME:\\=\% 
echo JAVA_HOME was found to be %JAVA_HOME% 
goto END 
:ERROR 
echo reg1.txt is: & type reg1.txt 
echo reg2.txt is: & type reg2.txt 
echo 
:END 
del reg2.txt 
del reg1.txt 
pause>nul 

Answer 1

好吧，我終於想出了答案。它花了一段時間，這段代碼真的很粗糙，但它的工作原理。如果有人想改善它，我會給他們回答點：

@ECHO off 
SET TITLE=detectJDK.bat 
TITLE=%TITLE% 
SETLOCAL ENABLEDELAYEDEXPANSION 
IF EXIST jdkhome.txt (
    ECHO JDK home already set in jdkhome.txt file. 
    GOTO :END 
) 
ECHO. 2>merged.txt 
ECHO. 2>list.txt 
ECHO. 2>uniquelist.txt 
IF NOT EXIST reg32.txt ECHO. 2>reg32.txt 
IF NOT EXIST reg64.txt ECHO. 2>reg64.txt 
START /w REGEDIT /e reg32.txt "HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\JavaSoft\Java Development Kit" 
TYPE reg32.txt | FIND "JavaHome" > merged.txt 
START /w REGEDIT /e reg64.txt "HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Development Kit" 
TYPE reg64.txt | FIND "JavaHome" >> merged.txt 
FOR /f "tokens=2 delims==" %%x IN (merged.txt) DO (
    CALL :STRIP "%%~x" >>list.txt 
) 

FOR /F "tokens=* delims= " %%a IN (list.txt) DO (
    SET str=%%a 
    FIND /I ^"!str!^" list.txt>nul 
    FIND /I ^"!str!^" uniquelist.txt>nul 
    IF ERRORLEVEL 1 ECHO !str!>>uniquelist.txt 
) 

ECHO Select a JDK from the list: 
SET /A COUNT=0 
FOR /f "tokens=1,* delims=" %%y IN (uniquelist.txt) DO (
    SET /A COUNT += 1 
    ECHO !COUNT!: %%~y 
) 
SET /P NUMBER=Type a number here: 
SET /A COUNT=0 
FOR /f "tokens=1,* delims=" %%z IN (uniquelist.txt) DO (
    SET /A COUNT += 1 
    IF !COUNT!==!NUMBER! (
    SET JAVA_HOME=%%~z 
) 
) 
ECHO. 
ECHO JAVA_HOME was found to be %JAVA_HOME% 
ECHO %JAVA_HOME%>jdkhome.txt 
GOTO CLEANUP 

:CLEANUP 
DEL /Q merged.txt 
DEL /Q list.txt 
DEL /Q uniquelist.txt 
DEL /Q reg32.txt 
DEL /Q reg64.txt 
GOTO :END 

:: Strip quotes and extra backslash from string 
:STRIP 
SET n=%~1 
SET n=%n:\\=\% 
SET n=%n:"=% 
IF NOT "%n%"=="" ECHO %n% 
GOTO :EOF 

:END 
FOR /l %%a in (5,-1,1) do (TITLE %TITLE% -- Closing in %%as&ping -n 2 -w 1 127.0.0.1>NUL) 
:: end 

Answer 2

你可以檢查註冊表

Answer 3

下HKEY_LOCAL_MACHINE \ SOFTWARE項\ JavaSoft的\ Java運行時環境是否真的需要使用Windows註冊表？如果不是，您可以檢查是否存在JAVA_HOME和/或JDK_HOME環境變量。如果它們存在，那麼它們指向Java安裝的安裝目錄，並且可以假定它們指向的Java安裝是用戶想要使用的安裝目錄。