[其他] 帮我看看这个批处理是什么意思？

if "%OS%"=="Windows_NT" setlocal 

if not ""=="%1" ( 
set JAVA_HOME=%1 
goto CheckENV 
) 

if exist ..\ufjdk\bin\java.exe ( 
set JAVA_HOME=..\ufjdk 
goto INSTALL 
) 

if ""=="%JAVA_HOME%" ( 
echo Please set JAVA_HOME environment variable first . 
goto QUIT 
) 

:CheckENV 
if not exist %JAVA_HOME%\bin\java.exe ( 
echo Please set a valid JAVA_HOME environment. "%1" is invalid . 
goto QUIT 
) 

if not exist "%JAVA_HOME%\bin\jconsole.exe" ( 
echo JAVA_HOME environment not is 1.5 version of JDK . 
goto QUIT 
) 

:INSTALL 
echo Setting JAVA_HOME environment variable with %JAVA_HOME% . 

for %%i in (.\ext\*.jar) do call cpappend.bat %%i 
set _CLASSPATH=.;.\install.jar;.\xmlstream.jar;.\treecreator.jar;%_LIB_JARS% 

"%JAVA_HOME%\bin\java" -classpath %_CLASSPATH% -Dinstall.batchfile.copyall=false nc.newinstall.Install 

UIT 

if "%OS%"=="Windows_NT" endlocal 
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