bash Java 无法获取环境变量（系统属性）
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/28002327/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Java cannot get environment variable (system property)
提问by quarks
I need that my code can get the environment variable when running test with IntelliJ:
我需要在使用 IntelliJ 运行测试时我的代码可以获取环境变量：
private String sdkDir = System.getProperty("sdk.root");
The problem is that this is always null, I have set both in bashrcand also with bash_profilebut not really works with Ubuntu.
问题是，这始终是null，我已经在Ubuntu 中进行了设置bashrc，bash_profile但并没有真正适用于 Ubuntu。
bashrcand bash_profileboth have this:
bashrc并且bash_profile都有这个：
export JAVA_HOME=/home/xybrek/zulu1.8.0_25-8.4.0.1-x86lx64
export JAVA_OPTIONS="-Dsdk.root=/home/xybrek/java-sdk-1.9.17"
export PATH=$PATH:/home/xybrek/zulu1.8.0_25-8.4.0.1-x86lx64/bin
export PATH
What could be missing with my configuration?
我的配置可能缺少什么？
Update:
更新：
I cannot change the Java code: System.getProperty("sdk.root");as this is coming from a compiled Arquillian container I can't modify.
我无法更改 Java 代码：System.getProperty("sdk.root");因为它来自已编译的 Arquillian 容器，我无法修改。
What I need would be a proper way of having this System.getPropertymethod to get the value.
我需要的是使用此System.getProperty方法获取值的正确方法。
Where to put this "sdk.root" for IntelliJ to pick it up? In a properties file or bash?
把这个“sdk.root”放在哪里让 IntelliJ 捡起来？在属性文件或 bash 中？
回答by laune
You have to use
你必须使用
String val = System.getenv( "PATH" );
for the value of an environment variable. A property value has nothing to do with the Environment of a process.
对于环境变量的值。属性值与进程的环境无关。
String val = System.getProperty( "sdk.root");
is for properties.
是为属性。
There should be a way of setting command line arguments in the dialog for preparing the execution of a Java program in your IDE. This is where you should define -Dsdk.root=....
应该有一种方法可以在对话框中设置命令行参数，以准备在 IDE 中执行 Java 程序。这是您应该定义 -Dsdk.root=... 的地方。
