@echo off

 ::设定环境变量

 echo 设定环境变量

 echo.

 set "javahome=D:\Ruanjian\Java\jdk1.8.0_141"

 set "classpath=.;"

 set "pathpath=%%JAVA_HOME%%\BIN"

 set "ev_javahome=JAVA_HOME"

 set "ev_classpath=CLASSPATH"

 ::检查JAVA_HOME

 wmic ENVIRONMENT where "name='%ev_javahome%'" get VariableValue|findstr /i /c:"VariableValue">nul&&(goto ENV_CREATEJAVAHOEM)

 echo %env_path1%环境变量未创建

 echo 创建环境变量

 wmic ENVIRONMENT create name="%ev_javahome%",username="<system>",VariableValue="%javahome%"

 :ENV_CREATEJAVAHOEM

 echo %ev_javahome%环境变量已创建

 echo.

 ::检查CLASSPATH

 wmic ENVIRONMENT where "name='%ev_classpath%'" get VariableValue|findstr /i /c:"VariableValue">nul&&(goto ENV_CREATECLASSPATH)

 echo %ev_classpath%环境变量未创建

 echo 创建环境变量

 wmic ENVIRONMENT create name="%ev_classpath%",username="<system>",VariableValue="%classpath%"

 :ENV_CREATECLASSPATH

 echo %ev_classpath%环境变量已创建

 echo.

 ::检查PATH中是否已添加%JAVA_HOME%\BIN

 wmic ENVIRONMENT where "name='PATH'" get VariableValue|findstr /i /c:"%pathpath%">nul&&(goto PATH_EXIST)

 echo PATH环境变量中未添加: %pathpath%

 set "set_val=%pathpath%;%PATH%"

 wmic ENVIRONMENT where "name='PATH' and username='<system>'" set VariableValue="%set_val%"

 :PATH_EXIST

 echo PATH环境变量中已添加: %pathpath%

 pause>nul

 @echo off

 echo 添加JAVA_HOME(亲试win764位)

 set regpath=HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Environment

 set evname=JAVA_HOME

 set evpath=%javahome%

 reg add "%regpath%" /v %evname% /d %evpath% /f

 ::添加环境变量CLASSPATH(亲试win764位)

 echo 添加CLASSPATH

 set regpath=HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Environment

 set evname=CLASSPATH

 set evpath=%classpath%

 reg add "%regpath%" /v %evname% /d %evpath% /f

 ::删除环境变量JAVA_HOME（未测试）

 @echo off

 echo 删除java环境变量

 set regpath=HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Environment

 set evname=JAVA_HOME

 reg delete "%regpath%" /v "%evname%" /f

 pause>nul

 ::是否存在（未测试）

 @echo off

   @set Path_=D:\Program Files

   for,/f,"skip=4 tokens=1,2,*",%%a,in,('reg query "HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Session Manager\Environment" /v 

 Path'),do,(

   @set PathAll_=%%c

   )

   echo %PathAll_%|find /i "%Path_%" && set IsNull=true|| set IsNull=false

   if not %IsNull%==true (

      reg add "HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Session Manager\Environment" /v Path /t REG_EXPAND_SZ /d "%PathAll_%;%Path_%" 

 /f

   )

 pause