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Repository: chroblert/JC-jEnv
Branch: master
Commit: a6b3388822a3
Files: 3
Total size: 11.6 KB

Directory structure:
gitextract_e5idpx28/

├── README.md
├── jEnv.bat
└── null

================================================
FILE CONTENTS
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================================================
FILE: README.md
================================================
# JC-jEnv

> Author: JC0o0l,Jerrybird
> 
> GitHub: https://github.com/chroblert/JC-jEnv.git
> 
> WeChat: JC_SecNotes(Zer0ne安全研究)

## 0x00 用途
Java版本切换工具,可以很方便的在java的多个版本之间切换。可以设置只在当前的终端中生效还是在全局都生效。

## 0x01 原理：

- 通过reg,set,setx等命令修改或刷新JAVA_HOME,PATH,`<alias>`等环境变量以及注册表。

- 将添加的`<alias>`保存到用户环境变量JC_jEnv中

- 通过call来达到多重嵌套的效果

- 通过doskey来设置命令别名

## 0x02 效果：

`jenv -h`

![1611209361297.png](img/1611209361297.png)

`jenv local java9`

![1611210131816.png](img/1611210131816.png)

`jenv version`

![1611210177545.png](img/1611210177545.png)

`jenv del java9`

![1611210266710.png](img/1611210266710.png)

`jenv add d:\11-java\jdk-9.0.4 java9`

![1611210250119.png](img/1611210250119.png)




## 0x03 参数说明：

`jenv [options]`

options如下
- version 
  - 显示当前设置的所有的java版本
- local `<alias>` 
   - 设置java版本，只在当前shell下起作用
- global `<alias>`
   - 设置java版本，在全局下都起作用
- add <目录> `<alias>`
   - 添加一个版本的java。
   - 如：`jenv add d:\java\jdk-9.0.4 java9`
- del `<alias>`   
   - 删除一个版本的java
   - 如：`jenv del java9`

## 0x04 使用说明：

1. 将该bat脚本添加到PATH系统环境变量中

    这样使用的时候，可以直接输入`jenv`
2. 用户环境变量PATH中使用%JAVA_HOME%\bin
    
    path环境变量中不能有具体的java路径，要使用%JAVA_HOME%\bin的方式,无论系统环境变量还是用户环境变量

3. 删除系统环境变量中的JAVA_HOME
   因为生成path环境变量的时候，系统变量中的path>用户环境变量中的path。而要修改系统环境变量，需要管理员权限，所以该程序只修改了用户环境变量。

注：
> - 系统环境变量中PATH值中的路径下不能有java.exe。如：C:\windows\system32路径下有8版本的java.exe，则全局无法生效，即：即使jenv global java13,但每次新创建的cmd下运行的java都是C:\windows\system32路径下的那个。
> - 该脚本使用用户环境变量，因而系统环境变量中不能有JAVA_HOME变量

## 0x05 测试环境

|序号|系统|版本|是否支持|
|---|-|--|--------|
|1|Windows 10|专业版|支持|
|2|  |  |  |
|3|  |  |  |
|4|  |  |  |


##  参考资料：

参考资料：[windows系统一键配置修改环境变量](https://www.jianshu.com/p/7d90042f644f)

参考资料：[Windows设置cmd别名](https://blog.csdn.net/YiRanZhiLiPoSui/article/details/83116819)

参考资料：[setx设置永久环境变量](https://blog.csdn.net/fm0517/article/details/52450940)

参考资料：[刷新环境变量](https://github.com/chocolatey/choco/blob/master/src/chocolatey.resources/redirects/RefreshEnv.cmd)

参考资料：[batch之变量延迟](https://www.cnblogs.com/ini_always/archive/2012/02/16/2355031.html)

参考资料：[was unexpect at this time](https://stackoom.com/question/2pffV/%E8%9D%99%E8%9D%A0-Set%E5%91%BD%E4%BB%A4%E5%9C%A8%E6%8B%AC%E5%8F%B7%E5%86%85%E4%B8%8D%E8%B5%B7%E4%BD%9C%E7%94%A8)

参考资料：[批处理变量多重嵌套](https://www.cnblogs.com/xxcanghai/p/4584042.html)

参考资料：[环境变量中特殊字符()的问题](https://qastack.cn/superuser/119610/spaces-and-parenthesis-in-windows-path-variable-screws-up-batch-files)

参考资料：[setx1024个字符限制的解决方法](https://qastack.cn/superuser/387619/overcoming-the-1024-character-limit-with-setx)

================================================
FILE: jEnv.bat
================================================
@echo off
chcp 65001
@REM AUTHOR: JC0o0l,Jerrybird
@REM description: java环境切换管理工具
@REM Repo: https://github.com/Chroblert/JC-jEnv.git

@REM set JC_jEnv=JC_jEnv

if "%1" == "local" (
    echo |set /p JCOut=" [+] jenv local alias"
    echo.
    goto switch_local 
)

if "%1" == "global" (
    echo | set /p JCOut=" [+] jenv global alias"
    echo.
    goto switch_global 
)

if "%1" == "add" (
    echo | set /p JCOut=" [+] jenv add jdk_dir alias"
    echo.
    goto addjdk
)
if "%1" == "del" (
    echo | set /p JCOut=" [+] jenv del alias"
    echo.
    goto deljdk
)

if "%1" == "version" (
    goto version
)

:usage
    @REM echo | set /p JCOut=" ================================================"
    echo ================================================
    @REM echo.
    echo | set /p JCOut=" | JC-jEnv"
    echo.
    echo | set /p JCOut=" | Despt:  windows Java环境管理工具"
    echo.
    echo | set /p JCOut=" | Author: JC0o0l,Jerrybird"
    echo.
    echo | set /p JCOut=" | Repo:   https://github.com/chroblert/JC-jEnv.git"
    echo.
    @REM echo | set /p JCOut=" ================================================"
    echo ================================================
    echo.
    echo | set /p JCOut=" 使用说明"
    echo.
    echo | set /p JCOut="  jenv [options]"
    echo.
    echo | set /p JCOut="       version "
    echo.
    echo | set /p JCOut="         - 显示当前所有的java版本"
    echo.
    echo | set /p JCOut="       local alias "
    echo.
    echo | set /p JCOut="         - 设置java版本，只在当前shell下起作用"
    echo.
    echo | set /p JCOut="       global alias "
    echo.
    echo | set /p JCOut="         - 设置java版本，在全局下都起作用"
    echo.
    echo | set /p JCOut="       add 目录 alias"
    echo.
    echo | set /p JCOut="         - add a version "
    echo.
    echo | set /p JCOut="       del alias     "
    echo.
    echo | set /p JCOut="         - delete a version"
    echo.
    goto end

:version
    if "%JC_jEnv%" == "" (
        echo | set /p JCOut=" 当前没有设置任何版本"
        echo.
        goto usage
    )
    @REM 枚举JC_jEnv环境变量中的值
    echo.
    echo | set /p JCOut=" all version:"
    echo.
    set remain=%JC_jEnv%
    setlocal enabledelayedexpansion
:loop
    for /f "delims=;, tokens=1*" %%i in ("%remain%") do (
        @REM echo | set /p JCOut=" %%i"
        @REM echo.
        set jenv_name=%%i
        set value=!%%i!
        if /i "!value!" equ "%JAVA_HOME%" (
            echo | set /p JCOut=" * !jenv_name! !value!"
            echo.
        ) else (
            echo | set /p JCOut="   !jenv_name! !value!"
            echo.
        )
        set remain=%%j
    )
    if defined remain goto :loop
    setlocal disabledelayedexpansion
    goto end
@REM 导出配置到文件
:export
    goto end

@REM 导入配置文件
:import
    goto end
:switch_local
    @REM call refreshenv
    set Java_env=%2
    @REM 多重变量嵌套
    call set TMP_JAVAHOME=%%%Java_env%%%
    set java_path=
    if NOT "%2" == "" (
        set java_path=%TMP_JAVAHOME%\bin
    ) 
    if "%java_path%" == "" (
        @REM 将(,)转义为^(,^)
        goto end
    )
    set "path=%java_path%;%path%"
    set "JAVA_HOME=%TMP_JAVAHOME%"
    echo | set /p JCOut="  已切换到%2 %java_path%"
    echo.
    @REM rem 设置别名
    %SystemRoot%\system32\doskey %2=%JAVA_HOME%\bin\java.exe $*   >null
    set java_path=
    set TMP_JAVAHOME=
    goto end

:switch_global
    @REM call refreshenv
    set Java_env=%2
    @REM 多重变量嵌套
    call set TMP_JAVAHOME=%%%Java_env%%%
    set java_path=
    if "%2" == "" (
        goto end
    ) 
    set java_path=%TMP_JAVAHOME%\bin
    if "%java_path%" == "" (
        goto end
    )
    REM 设置java_home环境变量
    reg delete HKCU\Environment /v JAVA_HOME /f >null
    echo | set /p JCOut="  .使用reg删除以前的JAVA_HOME %JAVA_HOME%"
    echo.
    reg add HKCU\Environment  /v JAVA_HOME /t REG_SZ /d %TMP_JAVAHOME%  /f >null
    echo | set /p JCOut="  .使用reg创建新的JAVA_HOME %TMP_JAVAHOME%"
    echo.
    setx JAVA_HOME %TMP_JAVAHOME% >null
    echo | set /p JCOut="  .使用setx更新JAVA_HOME"
    echo.
    @REM 更新本shell中path
    set "path=%java_path%;%path%"
    set "JAVA_HOME=%TMP_JAVAHOME%"
    @REM rem 设置别名
    %SystemRoot%\system32\doskey %2=%JAVA_HOME%\bin\java.exe $*   >null
    @REM echo | set /p JCOut=" "%path%""
    @REM echo.
    set java_path=
    set TMP_JAVAHOME=
    goto end

:setpathusereg
    echo | set /p JCOut=" 使用注册表设置PATH环境变量"
    echo.
    echo | set /p JCOut=" %~1   %~2"
    echo.
    reg delete HKCU\Environment /v %~1 /f
    reg add HKCU\Environment  /v %~1 /t REG_SZ /d "%~2"  /f
    call refreshenv
    goto :EOF
    @REM reg add "HKLM\System\CurrentControlSet\Control\Session Manager\Environment" /v JAVA_HOME /t REG_SZ /d "%~1" /f

:deljdk
    if NOT "%~2" == "" (
        @REM 删除某个版本的jdk
        reg delete HKCU\Environment /v %~2 /f >null
    )
    call set t_JC_jEnv=%%JC_jEnv:;%~2=%%
    call setx JC_jEnv %%t_JC_jEnv:%~2;=%%
    call set JC_jEnv=%%t_JC_jEnv:%~2;=%%
    set %~2=
    goto refreshenv
:addjdk
    rem echo | set /p JCOut=" [+] jenv add jdk_dir alias"
    rem echo.
    if [%2] == [] (
        echo | set /p JCOut=" 请设置JDK路径"
        echo.
        goto end
    )
    if [%3] == [] (
        echo | set /p JCOut=" 请设置JDK别名"
        echo.
        goto end
    )
    if %2 == "" (
        echo | set /p JCOut=" 请设置JDK路径"
        echo.
        goto end
    )
    if %3 == "" (
        echo | set /p JCOut=" 请设置JDK别名"
        echo.
        goto end
    )
    set JDK_ALIAS=%3
    set JDK_DIR=%2
    @REM 判断是否存在JDK_ALIAS别名
    call set t_temp=%%%JDK_ALIAS%%%
    if NOT "%t_temp%" == "" (
        echo | set /p JCOut=" %JDK_ALIAS%已经存在"
        echo.
        goto end
    )
    rem 添加至用户环境变量中
    %SystemRoot%\system32\setx %JDK_ALIAS% %JDK_DIR% >null
    @REM echo | set /p JCOut="/%SystemRoot%\system32\setx %JDK_ALIAS% %JDK_DIR% >>f:/JC_jEnv.cmd"
    @REM echo.
    echo | set /p JCOut="%JC_jEnv%"|%SystemRoot%\system32\findstr "%JDK_ALIAS%" >nul
    echo.
    set notexist=%errorlevel%
    @REM 环境变量JC_jEnv中已存在当前要添加JAVA_ALIAS
    if %notexist% == 0 (
        echo | set /p JCOut=" 已设置过该版本的java"
        echo.
        goto end
    )
    @REM 保存添加的环境变量到JC_jEnv中
    if "%JC_jEnv%" == "" (
        echo | set /p JCOut=" 用户环境变量中没有JC_jEnv"
        echo.
        %SystemRoot%\system32\setx JC_jEnv "%JDK_ALIAS%" >null
        @REM echo | set /p JCOut="/%SystemRoot%\system32\setx JC_jEnv "%JDK_ALIAS%" >>f:/JC_jEnv.cmd"
        @REM echo.
    ) else (
        %SystemRoot%\system32\setx JC_jEnv "%JDK_ALIAS%;%JC_jEnv%" >null
        @REM echo | set /p JCOut="/%SystemRoot%\system32\setx JC_jEnv "%JDK_ALIAS%;%JC_jEnv%" >>f:/JC_jEnv.cmd"
        @REM echo.
    )
    @REM rem 设置别名
    %SystemRoot%\system32\doskey %JDK_ALIAS%=%JDK_DIR%\bin\java.exe $*   >null
    @REM echo | set /p JCOut="/%SystemRoot%\system32\doskey %JDK_ALIAS%=%JDK_DIR%\bin\java.exe $* >>f:/JC_jEnv.cmd"
    @REM echo.

    echo | set /p JCOut=" 已为%JDK_DIR%\bin\java.exe设置别名%JDK_ALIAS%"
    echo.
    @REM 清空定义的变量
    @REM set JDK_ALIAS=
    set JDK_DIR=
    @REM 刷新环境变量
    goto refreshenv

:refreshenv
@echo off
::
:: RefreshEnv.cmd
::
:: Batch file to read environment variables from registry and
:: set session variables to these values.
::
:: With this batch file, there should be no need to reload command
:: environment every time you want environment changes to propagate

::echo "RefreshEnv.cmd only works from cmd.exe, please install the Chocolatey Profile to take advantage of refreshenv from PowerShell"
echo | set /p dummy="Refreshing environment variables from registry for cmd.exe. Please wait..."

goto main

:: Set one environment variable from registry key
:SetFromReg
    "%WinDir%\System32\Reg" QUERY "%~1" /v "%~2" > "%TEMP%\_envset.tmp" 2>NUL
    for /f "usebackq skip=2 tokens=2,*" %%A IN ("%TEMP%\_envset.tmp") do (
        echo/set "%~3=%%B"
    )
    goto :EOF

:: Get a list of environment variables from registry
:GetRegEnv
    "%WinDir%\System32\Reg" QUERY "%~1" > "%TEMP%\_envget.tmp"
    for /f "usebackq skip=2" %%A IN ("%TEMP%\_envget.tmp") do (
        if /I not "%%~A"=="Path" (
            call :SetFromReg "%~1" "%%~A" "%%~A"
        )
    )
    goto :EOF

:main
    echo/@echo off >"%TEMP%\_env.cmd"

    :: Slowly generating final file
    call :GetRegEnv "HKLM\System\CurrentControlSet\Control\Session Manager\Environment" >> "%TEMP%\_env.cmd"
    call :GetRegEnv "HKCU\Environment">>"%TEMP%\_env.cmd" >> "%TEMP%\_env.cmd"

    :: Special handling for PATH - mix both User and System
    call :SetFromReg "HKLM\System\CurrentControlSet\Control\Session Manager\Environment" Path Path_HKLM >> "%TEMP%\_env.cmd"
    call :SetFromReg "HKCU\Environment" Path Path_HKCU >> "%TEMP%\_env.cmd"

    :: Caution: do not insert space-chars before >> redirection sign
    echo/set "Path=%%Path_HKLM%%;%%Path_HKCU%%" >> "%TEMP%\_env.cmd"

    :: Cleanup
    del /f /q "%TEMP%\_envset.tmp" 2>nul
    del /f /q "%TEMP%\_envget.tmp" 2>nul

    :: capture user / architecture
    SET "OriginalUserName=%USERNAME%"
    SET "OriginalArchitecture=%PROCESSOR_ARCHITECTURE%"

    :: Set these variables
    call "%TEMP%\_env.cmd"

    :: Cleanup
    del /f /q "%TEMP%\_env.cmd" 2>nul

    :: reset user / architecture
    SET "USERNAME=%OriginalUserName%"
    SET "PROCESSOR_ARCHITECTURE=%OriginalArchitecture%"

    echo | set /p dummy="Finished."
    echo .
    goto :EOF


:end
    echo.
    echo Done


================================================
FILE: null
================================================
Download .txt 
gitextract_e5idpx28/

├── README.md
├── jEnv.bat
└── null
Download .json
Condensed preview — 3 files, each showing path, character count, and a content snippet. Download the .json file or copy for the full structured content (14K chars). 
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    "preview": "@echo off\nchcp 65001\n@REM AUTHOR: JC0o0l,Jerrybird\n@REM description: java环境切换管理工具\n@REM Repo: https://github.com/Chrobler"
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