用于检查 Java 主页并比较 Java 版本的批处理脚本

Question

您好，我需要一个批处理脚本来检查系统中是否有 java home 和脚本来比较 java 版本

我的要求是

1.) 脚本需要检查系统中是否设置了 java home。我认​​为“echo %JAVA_HOME%”会这样做。但是如果 Java Home 不可用，它需要显示一条消息显示“Java home is not可用。请在计算机>属性>变量路径中设置java主页。

2.) 需要检查系统中的java版本，如果java版本高于1.6_445则需要显示“Java版本高于MR工具将无法安装。（我认为对于这个，它需要创建一个数组并存储 Java 版本的值，并且需要比较这些值。但我不知道如何为它编写代码）由于 Java 版本包含下划线，所以我认为比较将是一项艰巨的任务.

目前我正在使用下面的脚本，但它根本不能满足我的要求。谁能帮我制作一个满足上述要求的脚本。提前致谢

回声 setlocal enableextensions disableddelayedexpansion

:: possible locations under HKLM\SOFTWARE of JavaSoft registry data
set "javaNativeVersion="
set "java32ON64=Wow6432Node\"

:: for variables
::    %%k = HKLM\SOFTWARE subkeys where to search for JavaSoft key
::    %%j = full path of "Java Runtime Environment" key under %%k
::    %%v = current java version
::    %%e = path to java

set "javaDir="
set "javaVersion="
for %%k in ( "%javaNativeVersion%" "%java32ON64%") do if not defined javaDir (
    for %%j in (
        "HKLM\SOFTWARE\%%~kJavaSoft\Java Runtime Environment"
    ) do for /f "tokens=3" %%v in (
        'reg query "%%~j" /v "CurrentVersion" 2^>nul ^| find /i "CurrentVersion"'
    ) do for /f "tokens=2,*" %%d in (
        'reg query "%%~j\%%v" /v "JavaHome"   2^>nul ^| find /i "JavaHome"'
    ) do ( set "javaDir=%%~e" & set "javaVersion=%%v" )
)

if not defined javaDir (
    echo Java not found
) else (
    echo JAVA_HOME="%javaDir%"
    echo JAVA_VERSION="%javaVersion%"
)

endlocal
pause

Answer 1

 @echo off
:: possible locations under HKLM\SOFTWARE of JavaSoft registry data
set "javaNativeVersion="
set "java32ON64=Wow6432Node\"

:: for variables
::    %%k = HKLM\SOFTWARE subkeys where to search for JavaSoft key
::    %%j = full path of "Java Runtime Environment" key under %%k
::    %%v = current java version
::    %%e = path to java

set "javaDir="
set "javaVersion="
for %%k in ( "%javaNativeVersion%" "%java32ON64%") do if not defined javaDir (
    for %%j in ("HKLM\SOFTWARE\%%~kJavaSoft\Java Runtime Environment"
    ) do for /f "tokens=3" %%v in (
        'reg query "%%~j" /v "CurrentVersion" 2^>nul ^| find /i "CurrentVersion"'
    ) do for /f "tokens=2,*" %%d in (
        'reg query "%%~j\%%v" /v "JavaHome"   2^>nul ^| find /i "JavaHome"'
    ) do ( set "javaDir=%%~e" & set "javaVersion=%%v" )
)

if not defined javaDir (
    echo Java not found
    exit /b 1
) else (
    echo JAVA_HOME=%javaDir%
    set JAVA_HOME=%javaDir%
    PATH %JAVA_HOME%\bin;%PATH%
    java.exe >nul 2>&1 || (
        setx JAVA_HOME %JAVA_HOME%
        setx PATH %PATH%
    )
    echo  JAVA_VERSION=%javaVersion%
)

for /f tokens^=2-5^ delims^=.-_^" %%j in ('java -fullversion 2^>^&1') do @set "jver=%%j%%k%%l%%m"
echo full java version %jver%
if %jver% GTR  16445 (
    echo "Java version is higher MR tool will not able to install"
    exit /b 2
)