通过批处理bat设置系统环境变量的实现代码

set JAVA_HOME=C:\Program Files\Java2\jdk1.6.0_45
set PATH=%JAVA_HOME%/bin;%JAVA_HOME%/jre/bin 
set CLASSPATH=.;%JAVA_HOME%\lib\dt.jar;%JAVA_HOME%\lib\tools.jar; 

start """F:\Program Files (x86)\Jaspersoft\iReport-5.6.0\bin\ireport.exe"

# ${HOME} will be replaced by user home directory according to platform
default_userdir="${HOME}/.${APPNAME}/5.6.0"
default_mac_userdir="${HOME}/Library/Application Support/${APPNAME}/5.6.0"

# options used by the launcher by default, can be overridden by explicit
# command line switches
default_options="-J-Xms256m -J-Xmx512m -J-Dorg.netbeans.ProxyClassLoader.level=1000 -J-XX:MaxPermSize=512m -J-Dapple.laf.useScreenMenuBar=true -J-Dapple.awt.graphics.UseQuartz=true -J-Dnetbeans.exception.report.min.level=99999 "
# for development purposes you may wish to append: -J-Dnetbeans.logger.console=true -J-ea

# default location of JDK/JRE, can be overridden by using --jdkhome <dir> switch
jdkhome="C:\Program Files\Java2\jdk1.6.0_45"

# clusters' paths separated by path.separator (semicolon on Windows, colon on Unices)
#extra_clusters=

ireport.conf

::添加环境变量JAVA_HOME
@echo off
echo 添加java环境变量
set regpath=HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Environment
set evname=JAVA_HOME
set javapath=c:\java\jdk
reg add "%regpath%" /v %evname% /d %javapath% /f
pause>nul
 
 
::删除环境变量JAVA_HOME
@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

@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