Java獲取特殊目錄或特殊值

 public static void main(String[] args) {

		
		Properties properties = System.getProperties()  ;
		
		for(Map.Entry<?, ?> entry : properties.entrySet()){
			System.out.println( entry.getKey() 
					 + "-->" + entry.getValue() ); 
		}
		System.out.println( System.getProperty("##########################") ); 
		Map<String , String> map = System.getenv() ; 
		for(Map.Entry<?, ?> entry : map.entrySet()){
			System.out.println( entry.getKey() 
					 + "-->" + entry.getValue() ) ;  
		} 
	}

系統輸出這樣的結果：
java.runtime.name-->Java(TM) SE Runtime Environment

sun.boot.library.path-->E:softJAVAjdk1.6.0_21jrebin

java.vm.version-->17.0-b17

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

sun.java.launcher-->SUN_STANDARD

user.country-->CN

sun.os.patch.level-->Service Pack 3

java.vm.specification.name-->Java Virtual Machine Specification

user.dir-->F:httpclient

java.runtime.version-->1.6.0_21-b07

java.awt.graphicsenv-->sun.awt.Win32GraphicsEnvironment

java.endorsed.dirs-->E:softJAVAjdk1.6.0_21jrelibendorsed

os.arch-->x86

java.io.tmpdir-->C:DOCUME~1ADMINI~1LOCALS~1Temp

line.separator-->

java.vm.specification.vendor-->Sun Microsystems Inc.

user.variant-->

os.name-->Windows XP

sun.jnu.encoding-->GBK

java.library.path-->E:softJAVAjdk1.6.0_21bin;.;C:WINDOWSSunJavabin;C:WINDOWSsystem32;C:WINDOWS;C:WINDOWSsystem32;C:WINDOWS;C:WINDOWSSystem32Wbem;E:softJAVAjdk1.6.0_21bin;E:softapache-maven-3.0.4bin;

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 SettingsAdministrator

user.timezone-->

java.awt.printerjob-->sun.awt.windows.WPrinterJob

file.encoding-->GBK

java.specification.version-->1.6

java.class.path-->F:httpclientWebRootWEB-INFclasses

user.name-->Administrator

java.vm.specification.version-->1.0

java.home-->E:softJAVAjdk1.6.0_21jre

sun.arch.data.model-->32

user.language-->zh

java.specification.vendor-->Sun Microsystems Inc.

awt.toolkit-->sun.awt.windows.WToolkit

java.vm.info-->mixed mode

java.version-->1.6.0_21

java.ext.dirs-->E:softJAVAjdk1.6.0_21jrelibext;C:WINDOWSSunJavalibext

sun.boot.class.path-->E:softJAVAjdk1.6.0_21jrelibresources.jar;E:softJAVAjdk1.6.0_21jrelibrt.jar;E:softJAVAjdk1.6.0_21jrelibsunrsasign.jar;E:softJAVAjdk1.6.0_21jrelibjsse.jar;E:softJAVAjdk1.6.0_21jrelibjce.jar;E:softJAVAjdk1.6.0_21jrelibcharsets.jar;E:softJAVAjdk1.6.0_21jreclasses;E:softJAVAMyEclipsemyeclipseeclipsepluginscom.genuitec.eclipse.j2eedt.core_6.5.0.zmyeclipse650200806datalibraryset1.4activation.jar;E:softJAVAMyEclipsemyeclipseeclipsepluginscom.genuitec.eclipse.j2eedt.core_6.5.0.zmyeclipse650200806datalibraryset1.4javax.servlet.jar;E:softJAVAMyEclipsemyeclipseeclipsepluginscom.genuitec.eclipse.j2eedt.core_6.5.0.zmyeclipse650200806datalibraryset1.4javax.servlet.jsp.jar;E:softJAVAMyEclipsemyeclipseeclipsepluginscom.genuitec.eclipse.j2eedt.core_6.5.0.zmyeclipse650200806datalibraryset1.4jboss-j2ee.jar;E:softJAVAMyEclipsemyeclipseeclipsepluginscom.genuitec.eclipse.j2eedt.core_6.5.0.zmyeclipse650200806datalibraryset1.4jboss-jaxrpc.jar;E:softJAVAMyEclipsemyeclipseeclipsepluginscom.genuitec.eclipse.j2eedt.core_6.5.0.zmyeclipse650200806datalibraryset1.4jboss-jsr77.jar;E:softJAVAMyEclipsemyeclipseeclipsepluginscom.genuitec.eclipse.j2eedt.core_6.5.0.zmyeclipse650200806datalibraryset1.4jboss-saaj.jar;E:softJAVAMyEclipsemyeclipseeclipsepluginscom.genuitec.eclipse.j2eedt.core_6.5.0.zmyeclipse650200806datalibraryset1.4mail.jar;E:softJAVAMyEclipsemyeclipseeclipsepluginscom.genuitec.eclipse.j2eedt.core_6.5.0.zmyeclipse650200806datalibraryset1.4namespace.jar;E:softJAVAMyEclipsemyeclipseeclipsepluginscom.genuitec.eclipse.j2eedt.core_6.5.0.zmyeclipse650200806datalibraryset1.4xml-apis.jar

java.vendor-->Sun Microsystems Inc.

file.separator-->

java.vendor.url.bug-->http://java.sun.com/cgi-bin/bugreport.cgi

sun.io.unicode.encoding-->UnicodeLittle

sun.cpu.endian-->little

sun.desktop-->windows

sun.cpu.isalist-->pentium_pro+mmx pentium_pro pentium+mmx pentium i486 i386 i86

null

USERPROFILE-->C:Documents and SettingsAdministrator

PATHEXT-->.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH

ORACLE_HOME-->E:softOra10InstantClient

JAVA_HOME-->E:softJAVAjdk1.6.0_21

MAVEN_HOME-->E:softapache-maven-3.0.4

TEMP-->C:DOCUME~1ADMINI~1LOCALS~1Temp

SystemDrive-->C:

MOZ_PLUGIN_PATH-->E:softFoxitplugins

ProgramFiles-->C:Program Files

Path-->C:WINDOWSsystem32;C:WINDOWS;C:WINDOWSSystem32Wbem;E:softJAVAjdk1.6.0_21bin;E:softapache-maven-3.0.4bin;

HOMEDRIVE-->C:

PROCESSOR_REVISION-->0f0d

TNS_ADMIN-->E:softOra10InstantClient

CLIENTNAME-->Console

USERDOMAIN-->ELECTRUM006

ALLUSERSPROFILE-->C:Documents and SettingsAll Users

PROCESSOR_IDENTIFIER-->x86 Family 6 Model 15 Stepping 13, GenuineIntel

SESSIONNAME-->Console

TMP-->C:DOCUME~1ADMINI~1LOCALS~1Temp

LOGONSERVER-->ELECTRUM006

CommonProgramFiles-->C:Program FilesCommon Files

PROCESSOR_ARCHITECTURE-->x86

FP_NO_HOST_CHECK-->NO

OS-->Windows_NT

HOMEPATH-->Documents and SettingsAdministrator

PROCESSOR_LEVEL-->6

1830B7BD-F7A3-4c4d-989B-C004DE465EDE-->1f4:bd918

COMPUTERNAME-->ELECTRUM006

windir-->C:WINDOWS

SystemRoot-->C:WINDOWS

NUMBER_OF_PROCESSORS-->2

USERNAME-->Administrator

NLS_LANG-->SIMPLIFIED CHINESE_CHINA.ZHS16GBK

ComSpec-->C:WINDOWSsystem32cmd.exe

APPDATA-->C:Documents and SettingsAdministratorApplication Data