在Windows中使用cmd设置环境变量 [英] setting environmental variable in windows using cmd

问题描述

要在Windows中启动我的项目，我必须使用以下命令在cmd中设置Java环境变量

To start the my project in windows i have to set the java environmental variable in cmd using below command

set JAVA_HOME = D:\Java\jdk1.7.0

但它没有设置环境变量，我不知道是什么问题。在等待了几个小时后，我发现了由于 = 符号两边的空白而导致的原因。由于未设置此环境变量，我通过命令将其更改为

but it didn't set the environment variable, i don't know what the issue.After pending couple hours i find the reason that is due to white space on both side of = symbol.Because of this environmental variable not getting set and i changed by command to

set JAVA_HOME=D:\Java\jdk1.7.0

之后它可以正常工作。

我的问题是为什么这两个命令不相等？

My question is why this both command are not equal?

推荐答案

set 命令知道空格。发出命令时

The set command is aware of spaces. When you issue the command

set JAVA_HOME = D:\Java\jdk1.7.0

您实际上将变量JAVA_HOME␣设置为值␣ D：\Java\jdk1.7.0 。请注意以下空格：␣！

you actually set the variable JAVA_HOME␣ to value ␣D:\Java\jdk1.7.0. Note the spaces: ␣!

您可以使用以下方式进行检查：

You can check it using the following way:

> echo [%JAVA_HOME%]
[%JAVA_HOME%]
> echo [%JAVA_HOME %]
[ D:\Java\jdk1.7.0]

包含括号是为了突出显示空格，它们本身并不重要。

The brackets are included in order to highlight spaces, they are not important by themselves.

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