JAVA -D命令选项

最新推荐文章于 2024-12-10 17:16:16 发布

helloxielan

最新推荐文章于 2024-12-10 17:16:16 发布

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文章标签： java python

原文链接：https://my.oschina.net/u/138995/blog/192570

本文介绍了如何使用Java的-D选项来设置系统属性，并给出了具体的示例。此外还对比了-D选项与-d选项的区别，强调了大小写的重要性。文章列举了一些默认已设置的系统属性。

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2019独角兽企业重金招聘Python工程师标准>>>

A JVM runs with a number of system properties. You can configure system properties by using the -D option, pronounced with an upper case 'D'

All you have to do i suse the -D flag, and provide the system prperty name immediately following the D, and equals sign, and then the value to be assigned to the property. For example, to set the file.encoding property of the Java runtime to utf-8, you could set the following property:

java -Dfile.encoding=utf-8

You can then grab the value programatically as follows:

System.getProperty("file.encoding"); /*this method is overloaded, as per previous post*/

System geProperty JavaDoc

Don't confuse the -D switch with the -d switch. Both are tested on the SCJA exam, but both do different things. Casing is important!

Some of the default properties that are supposed to have already been set include: file.encoding, file.separator, java.home and java.version.

转载于:https://my.oschina.net/u/138995/blog/192570