Batch file to extract portable version of java jre or jdk from installer

java_extract.bat

@echo off
rem Batch file that extracts java from installer
rem Original topic on stackoverflow:
rem http://stackoverflow.com/questions/1619662/how-can-i-get-the-latest-jre-jdk-as-a-zip-file-rather-than-exe-or-msi-installe

setlocal
if [%1]==[] goto usage
set fn=%~n1
7z.exe e %1 .rsrc\1033\JAVA_CAB10\111
if errorlevel 1 goto err

del %1
7z.exe e 111 tools.zip
if errorlevel 1 goto err

del 111
7z.exe x tools.zip -o%fn%
if errorlevel 1 goto err

del tools.zip
for /r %%i in (*.pack) do (
    %fn%\bin\unpack200.exe %%i %%~pi%%~ni.jar
    if errorlevel 1 goto err
    del %%i
)
echo.
echo All done!
goto end

:usage
echo Usage: %0 ^<JDK/JRE filename^>
echo Note: 7z.exe is required in the folder or in PATH
echo.
echo Example: %0 jdk-8u121-windows-x64.exe
goto end

:err
echo.
echo An error occured, operation aborted

:end
endlocal