getting environment variable's value in java?

Question

I have set an environment variable in windows by name "sample". Can I get this environment variable's value using below code?

System.getProperty("sample");

in UAT environment I have LINUX OS. Can I set the same environment variable in LINUX OS and retrieve the same using System.getProperty("sample")?

I mean does System.getProperty("sample"); retrieves irrespective of the operating system?

Also, I would like to get the environment variable's value in JSP.I know it is not recommended to keep logic in jsp but still, I need to use it. Can I use System.getProperty("sample"); in jsp? Please help me.

score 16 · Answer 1 · edited May 23 '17 at 12:09

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Use System.getenv() to retrieve environment variables, not System.getProperty(). The latter is for (as the name implies) system properties.

What's the difference? Java system properties and environment variables

If you need to access an environment variable in a JSP, you're doing something wrong. At the very least, use a servlet. More reading: How to avoid Java code in JSP files?

edited May 23 '17 at 12:09

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answered May 05 '12 at 15:35

Matt Ball

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Hi Matt, Thanks for your reply. what is difference between system properties and environment variables? Thanks! – user1016403 May 05 '12 at 15:39

score 1 · Accepted Answer · answered May 05 '12 at 15:35

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yes this is irrespective of OS and you can use it in JSP.

answered May 05 '12 at 15:35

Satya

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Hi Satya, Thanks for your reply. which one is irrespective of OS> System.getenv() or System.getProperty()? Thanks! – user1016403 May 05 '12 at 15:41
@user1016403 they **both** are. Java is meant to be completely OS-independent. – Matt Ball May 05 '12 at 15:42

getting environment variable's value in java?

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