java.lang.System.getProperties() 方法确定当前系统属性。当前设置用于通过getProperty(String)方法使用系统属性返回一个Properties对象。

如果没有当前系统属性的集合，那么它首先创建并初始化系统属性的集合。这套系统属性包括以下键的值：

Key	关联值的说明
java.version	Java Runtime Environment version
java.vendor	Java Runtime Environment vendor
java.vendor.url	Java vendor URL
java.home	Java installation directory
java.vm.specification.version	Java Virtual Machine specification version
java.vm.specification.vendor	Java Virtual Machine specification vendor
java.vm.specification.name	Java Virtual Machine specification name
java.vm.version	Java Virtual Machine implementation version
java.vm.vendor	Java Virtual Machine implementation vendor
java.vm.name	Java Virtual Machine implementation name
java.specification.version	Java Runtime Environment specification version
java.specification.vendor	Java Runtime Environment specification vendor
java.specification.name	Java Runtime Environment specification name
java.class.version	Java class format version number
java.class.path	Java class path
java.library.path	List of paths to search when loading libraries
java.io.tmpdir	Default temp file path
java.compiler	Name of JIT compiler to use
java.ext.dirs	Path of extension directory or directories
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 (" " on UNIX)
user.name	User's account name
user.home	User's home directory
user.dir	User's current working directory

声明

以下是java.lang.System.getProperties()方法的声明

public static Properties getProperties()

参数

• NA

返回值

此方法返回系统属性。

异常

• SecurityException -- 如果安全管理器存在并且其checkPermission方法不允许访问过程中的环境。

例子

下面的例子显示java.lang.System.getProperties()方法的使用。

package com.yiibai;

import java.lang.*;

public class SystemDemo {

   public static void main(String[] args) {

      // this will list the current system properties
      Properties p = System.getProperties();
      p.list(System.out);
  }
} 

让我们来编译和运行上面的程序，这将产生以下结果：

-- listing properties --
java.runtime.name=Java(TM) SE Runtime Environment
sun.boot.library.path=C:Program FilesJavajdk1.6.0_06jre...
java.vm.version=10.0-b22
java.vm.vendor=Sun Microsystems Inc.
java.vendor.url=http://java.sun.com/
path.separator=;
java.vm.name=Java HotSpot(TM) Client VM
file.encoding.pkg=sun.io
user.country=US
sun.java.launcher=SUN_STANDARD
sun.os.patch.level=Service Pack 2
java.vm.specification.name=Java Virtual Machine Specification
user.dir=C:Program FilesJavajdk1.6.0_06in
java.runtime.version=1.6.0_06-b02
java.awt.graphicsenv=sun.awt.Win32GraphicsEnvironment
java.endorsed.dirs=C:Program FilesJavajdk1.6.0_06jre...
os.arch=x86
java.io.tmpdir=C:DOCUME~1AMIT~1.AMILOCALS~1Temp
line.separator=

java.vm.specification.vendor=Sun Microsystems Inc.
user.variant=
os.name=Windows XP
sun.jnu.encoding=Cp1252
java.library.path=C:Program FilesJavajdk1.6.0_06in...
java.specification.name=Java Platform API Specification
java.class.version=50.0
sun.management.compiler=HotSpot Client Compiler
os.version=5.1
user.home=C:Documents and Settingsamit.AMIT-4...
user.timezone=
java.awt.printerjob=sun.awt.windows.WPrinterJob
file.encoding=Cp1252
java.specification.version=1.6
user.name=amit
java.class.path=.
java.vm.specification.version=1.0
sun.arch.data.model=32
java.home=C:Program FilesJavajdk1.6.0_06jre
java.specification.vendor=Sun Microsystems Inc.
user.language=en
awt.toolkit=sun.awt.windows.WToolkit
java.vm.info=mixed mode, sharing
java.version=1.6.0_06
java.ext.dirs=C:Program FilesJavajdk1.6.0_06jre...
sun.boot.class.path=C:Program FilesJavajdk1.6.0_06jre...
java.vendor=Sun Microsystems Inc.
file.separator=
java.vendor.url.bug=http://java.sun.com/cgi-bin/bugreport...
sun.cpu.endian=little
sun.io.unicode.encoding=UnicodeLittle
sun.desktop=windows
sun.cpu.isalist=