Windows批处理循环设置环境变量命令 [英] windows batch command for loop set environment variable

问题描述

我正在尝试寻找一种动态构建环境变量的方法，该环境变量包含应用程序的WEB-INF/lib文件夹下的JAR文件列表.

I'm trying to find a way to dynamically build en environment variable that contains a list of JAR files under my app's WEB-INF/lib folder.

到目前为止，这是我所拥有的，但是每次都会覆盖自身，因此，当您到达循环末尾时，只需在变量中设置循环中的最后一个文件即可.

This is what I have so far, but it's over-writing itself each time, so when you reach the end of the loop, you just have the last file from the loop set in the variable.

 SETLOCAL ENABLEDELAYEDEXPANSION

for %%f IN (WEB-INF/lib/*.jar) DO (

  SET JAR_LIST=%JAR_LIST%;%%f

)

ECHO JAR_LIST -- %JAR_LIST%

所以这产生了...

C:\ apache \ Tomcat6.0 \ webapps \ myapp>(SET JAR_LIST = .; xsltcbrazil.jar)

C:\apache\Tomcat6.0\webapps\myapp>(SET JAR_LIST=.;xsltcbrazil.jar )

C:\ apache \ Tomcat6.0 \ webapps \ myapp>(SET JAR_LIST = .; xsltcejb.jar)

C:\apache\Tomcat6.0\webapps\myapp>(SET JAR_LIST=.;xsltcejb.jar )

C:\ apache \ Tomcat6.0 \ webapps \ myapp>(SET JAR_LIST = .; xsltcservlet.jar)

C:\apache\Tomcat6.0\webapps\myapp>(SET JAR_LIST=.;xsltcservlet.jar )

C:\ apache \ Tomcat6.0 \ webapps \ myapp> ECHO JAR_LIST-.; xsltcservlet.jar

C:\apache\Tomcat6.0\webapps\myapp>ECHO JAR_LIST -- .;xsltcservlet.jar

JAR_LIST-.; xsltcservlet.jar

JAR_LIST -- .;xsltcservlet.jar

推荐答案

更改

SET JAR_LIST=%JAR_LIST%;%%f

到

SET JAR_LIST=!JAR_LIST!;%%f

这将使用运行时值而不是加载时值. 最好这样做以避免领先；

This will use the run-time value instead of the load-time value. It might be better to do this to avoid the leading ;

SETLOCAL ENABLEDELAYEDEXPANSION
SET "JAR_LIST="
for %%f IN (WEB-INF/lib/*.jar) DO (
if "!JAR_LIST!"=="" (SET JAR_LIST=%%f) ELSE (SET JAR_LIST=!JAR_LIST!;%%f)
)
ECHO JAR_LIST -- %JAR_LIST%

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