批次檔 IF EXIST,所有迴圈都被執行

批次檔 IF EXIST,所有迴圈都被執行

我正在執行一個批次文件,該文件檢查 Java\jre6 是否存在,然後將執行一種類型的命令,最後是一個 else 語句,但我發現所有 stmts 一起執行。

echo.
echo. 
GOTO:Java

:Java
IF EXIST C:\Program Files\Java\jre6(
echo. Java Version 1.6 present
start /wait /d "%CD%\Message" cscript MessageBox.vbs  "Java 6 thereeee"

if "%PROCESSOR_ARCHITECTURE%"=="x86" (
XCOPY "%CD%\Sec\*.*"  "%ProgramFiles%\Java\jre6\lib\security\" /s /Y
XCOPY "%CD%\Jar\*.*"  "%ProgramFiles%\Java\jre6\lib\ext\" /s /Y
)
else(
XCOPY "%CD%\Sec\*.*"  "%ProgramFiles(x86)%\Java\jre6\lib\security\" /s /Y
XCOPY "%CD%\Jar\*.*"  "%ProgramFiles(x86)%\Java\jre6\lib\ext\" /s /Y
)
start /wait /d "%CD%\Message" cscript MessageBox.vbs  "Your Settings have been installed successfully for 6"
)

IF EXIST C:\Program Files\Java\jre7(
echo. Java Version 1.7 present
start /wait /d "%CD%\Message" cscript MessageBox.vbs  "Java 7 thereeee"
if "%PROCESSOR_ARCHITECTURE%"=="x86" (
XCOPY "%CD%\Jar\*.*"  "%ProgramFiles%\Java\jre7\lib\ext\" /s /Y
XCOPY "%CD%\Sec7\*.*"  "%ProgramFiles%\Java\jre7\lib\security\" /s /Y
)
else
(
XCOPY "%CD%\Jar\*.*"  "%ProgramFiles(x86)%\Java\jre7\lib\ext\" /s /Y
XCOPY "%CD%\Sec7\*.*"  "%ProgramFiles(x86)%\Java\jre7\lib\security\" /s /Y
)
start /wait /d "%CD%\Message" cscript MessageBox.vbs  "Your Settings have been installed successfully for 7"
)

IF EXIST C:\Program Files\Java\jre8(
echo. Java Version 1.8 present
start /wait /d "%CD%\Message" cscript MessageBox.vbs  "Java 8 thereeee"
if "%PROCESSOR_ARCHITECTURE%"=="x86" (
XCOPY "%CD%\Sec\*.*"  "%ProgramFiles%\Java\jre8\lib\security\" /s /Y
XCOPY "%CD%\Jar\*.*"  "%ProgramFiles%\Java\jre8\lib\ext\" /s /Y
)
else(
XCOPY "%CD%\Sec\*.*"  "%ProgramFiles(x86)%\Java\jre8\lib\security\" /s /Y
XCOPY "%CD%\Jar\*.*"  "%ProgramFiles(x86)%\Java\jre8\lib\ext\" /s /Y
)
start /wait /d "%CD%\Message" cscript MessageBox.vbs  "Your Settings have been installed successfully for 8"
) 
ELSE (
echo. Java NOT present
start /wait /d "%CD%\Message" cscript MessageBox.vbs  "Java is not Installed In your system , install Java 1.8 and try to execute settings again"
GOTO:EXIT
)

:EXIT

答案1

必須解決的關鍵問題:

  • 如果 IF EXIST 檔案名稱包含空格(或有毒字符,如&),則必須用引號引起來。
  • (開始一段程式碼之前必須有一個空格
  • )ELSE、 和(必須全部出現在同一行
  • 你的邏輯是錯誤的 - 除非版本 1.8 存在,否則它將始終執行“Java NOT Present”程式碼。您必須使整個構造成為一個大 IF ... ELSE IF ... 鏈,或在每個 IF 區塊末尾使用 GOTO :SomeLabel

附加建議:

  • ECHO.不可靠。在某些不尋常的情況下,它可能會失敗。最好養成使用的習慣ECHO(,因為它總是有效的。我知道它看起來“錯誤”,就像它會混淆程式碼區塊一樣,但它實際上非常可靠。
  • ECHO(僅當您除了 ECHO 的空白(或可能只有空白)之外沒有任何內容時才需要。但始終使用這種形式肯定沒有什麼壞處。
  • 可在同一台電腦上安裝多個 JRE 版本。您可以考慮顛倒順序,以便它始終準備好找到的最新版本。
  • 除非您有其他程式碼未顯示在頂部附近,否則不需要 GOTO :JAVA
  • 除非您在 :EXIT 之後有其他程式碼,否則最好使用GOTO :EOFEXIT /B直接退出腳本,而無需在底部使用標籤。
  • 縮排是你的朋友。它有助於查看程式碼的邏輯 - 使其更容易理解。
echo(
echo( 
GOTO:Java

REM Presumably the GOTO above is conditional, and there is more code that goes here

:Java
IF EXIST "C:\Program Files\Java\jre6" (
  echo( Java Version 1.6 present
  start /wait /d "%CD%\Message" cscript MessageBox.vbs  "Java 6 thereeee"

  if "%PROCESSOR_ARCHITECTURE%"=="x86" (
    XCOPY "%CD%\Sec\*.*"  "%ProgramFiles%\Java\jre6\lib\security\" /s /Y
    XCOPY "%CD%\Jar\*.*"  "%ProgramFiles%\Java\jre6\lib\ext\" /s /Y
  ) else (
    XCOPY "%CD%\Sec\*.*"  "%ProgramFiles(x86)%\Java\jre6\lib\security\" /s /Y
    XCOPY "%CD%\Jar\*.*"  "%ProgramFiles(x86)%\Java\jre6\lib\ext\" /s /Y
  )
  start /wait /d "%CD%\Message" cscript MessageBox.vbs  "Your Settings have been installed successfully for 6"
) else IF EXIST "C:\Program Files\Java\jre7" (
  echo( Java Version 1.7 present
  start /wait /d "%CD%\Message" cscript MessageBox.vbs  "Java 7 thereeee"
  if "%PROCESSOR_ARCHITECTURE%"=="x86" (
    XCOPY "%CD%\Jar\*.*"  "%ProgramFiles%\Java\jre7\lib\ext\" /s /Y
    XCOPY "%CD%\Sec7\*.*"  "%ProgramFiles%\Java\jre7\lib\security\" /s /Y
  ) else (
    XCOPY "%CD%\Jar\*.*"  "%ProgramFiles(x86)%\Java\jre7\lib\ext\" /s /Y
    XCOPY "%CD%\Sec7\*.*"  "%ProgramFiles(x86)%\Java\jre7\lib\security\" /s /Y
  )
  start /wait /d "%CD%\Message" cscript MessageBox.vbs  "Your Settings have been installed successfully for 7"
) else IF EXIST "C:\Program Files\Java\jre8" (
  echo( Java Version 1.8 present
  start /wait /d "%CD%\Message" cscript MessageBox.vbs  "Java 8 thereeee"
  if "%PROCESSOR_ARCHITECTURE%"=="x86" (
    XCOPY "%CD%\Sec\*.*"  "%ProgramFiles%\Java\jre8\lib\security\" /s /Y
    XCOPY "%CD%\Jar\*.*"  "%ProgramFiles%\Java\jre8\lib\ext\" /s /Y
  ) else (
    XCOPY "%CD%\Sec\*.*"  "%ProgramFiles(x86)%\Java\jre8\lib\security\" /s /Y
    XCOPY "%CD%\Jar\*.*"  "%ProgramFiles(x86)%\Java\jre8\lib\ext\" /s /Y
  )
  start /wait /d "%CD%\Message" cscript MessageBox.vbs  "Your Settings have been installed successfully for 8"
) ELSE (
  echo( Java NOT present
  start /wait /d "%CD%\Message" cscript MessageBox.vbs  "Java is not Installed In your system , install Java 1.8 and try to execute settings again"
  goto :EXIT
)
REM Presumably there is more code here

:EXIT
REM Presumably there is cleanup code here

我還可以做很多事情來改進程式碼,但現在就足夠了。

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