java中的System.getProperty()和getenv()方法

Java system.getproperty(String name)获取系统属性

属性说明：

public class test{

    public static void main(String[] args) {

        System.out.println("Java Runtime Environment version = "

                + System.getProperty("java.version"));

        System.out.println("Java Runtime Environment vendor = "

                + System.getProperty("java.vendor"));

        System.out.println("Java vendor URL = "

                + System.getProperty("java.vendor.url"));

        System.out.println("Java installation directory = "

                + System.getProperty("java.home"));

        System.out.println("Java Virtual Machine specification version = "

                + System.getProperty("java.vm.specification.version"));

        System.out.println("Java Runtime Environment specification  version = "

                + System.getProperty("java.specification.version"));

        System.out.println("Java class format version number = "

                + System.getProperty("java.class.version"));

        System.out.println("Java class path = "

                + System.getProperty("java.class.path"));

        System.out.println("Operating system name = "

                + System.getProperty("os.name"));

        System.out.println("Operating system architecture = "

                + System.getProperty("os.arch"));

        System.out.println("File separator ('/' on UNIX) = "

                + System.getProperty("file.separator"));

        System.out.println("User's account name = "

                + System.getProperty("user.name"));

        System.out.println("User's home directory = "

                + System.getProperty("user.home"));

        System.out.println("User's current working directory = "

                + System.getProperty("user.dir"));

}    

Java system.getenv(String name)获取环境变量

System.out.println(System.getenv("Java_Home"));