Java基礎知識：如何獲取當前打開的Java工程路徑（以及更多系統屬性）

一個例子

獲取當前IDE打開的helloword工程路徑：

String dir = System.getProperty("user.dir");
String java = System.getProperty("java.home");
String os = System.getProperty("os.name");
System.out.println(dir);
System.out.println(java);
System.out.println(os);

打印結果：

C:\workspace\study\project\helloworld
C:\Program Files\Java\jdk1.8.0_202\jre
Windows 10

更多系統屬性

java.version

Java version number

java.vendor

Java vendor specific string

java.vendor.url

Java vendor URL

java.home

Java installation directory

java.class.version

Java class version number

java.class.path

Java classpath

os.name

Operating System Name

os.arch

Operating System Architecture

os.version

Operating System Version

file.separator

File separator ("/" on Unix)

path.separator

Path separator (":" on Unix)

line.separator

Line separator ("\n" on Unix)

user.name

User account name

user.home

User home directory

user.dir

User's current working directory