wmic ENVIRONMENT where "name='JAVA_HOME'" delete 2>&1 >nul
wmic ENVIRONMENT where "name='CLASSPATH'" delete 2>&1 >nul
wmic ENVIRONMENT create name="JAVA_HOME",username="<system>",VariableValue="%jh%"
wmic ENVIRONMENT where "name='Path' and username='<system>'" set VariableValue="%JAVA_HOME%\bin;%JAVA_HOME%\jre\bin;%Path%"
wmic ENVIRONMENT create name="CLASSPATH",username="<system>",VariableValue=".;%JAVA_HOME%\lib\tools.jar;%JAVA_HOME%\lib\dt.jar;%JAVA_HOME%\jre\lib\rt.jar"
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$REG = [Ordered]@{
	Path1 = "HKLM:\SOFTWARE\JavaSoft";
	Path2 = "HKLM:\SOFTWARE\WOW6432Node\JavaSoft";
	Path3 = "HKCU:\SOFTWARE\JavaSoft";
	Path4 = "HKCU:\SOFTWARE\WOW6432Node\JavaSoft";
};

$Arr = @(
	$REG.Values | Foreach {
		if (Test-Path $_) { LS $_ -rec | ? { if ( (gp registry::$_).JavaHome ) { $_ } } };
	}
);

$JAVA_HOME = (GP registry::$($Arr[0].Name)).JavaHome; #设置要添加的环境变量路径
$ClassPath = "%JAVA_HOME%\lib;%JAVA_HOME%\lib\dt.jar;%JAVA_HOME%\lib\tools.jar";

$directory = Split-Path $JAVA_HOME -Leaf;
$REF = $env:Path -Split ';' -NotMatch $directory -Join ';';
$Path = $REF + ';' + "%JAVA_HOME%\bin;";

Write-Host '$JAVA_HOME='$JAVA_HOME
Write-Host '$ClassPath='$ClassPath

[Environment]::SetEnvironmentVariable('JAVA_HOME', $JAVA_HOME, 'Machine');
[Environment]::SetEnvironmentVariable('ClassPath', $ClassPath, 'Machine');
[Environment]::SetEnvironmentVariable('Path', $Path, 'Machine');

pause;
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