如：

复制代码 代码如下:

public class EnvTest {

public static void main(String args[]) {

System.out.println(System.getenv(args[0]));

}

}

运行结果：

C:java>java EnvTest OS

Windows_NT

又如：

复制代码 代码如下:

import java.util.Map;

public class EnvDump {

public static void main(String args[]) {

for (Map.Entry entry: System.getenv().entrySet()) {

System.out.println(entry.getKey() + "=" + entry.getValue());

}

}

}

运行结果：

C:java>java EnvDump

PROCESSOR_ARCHITECTURE=x86

LOGONSERVER=ZZ3Z100

HOMEDRIVE=C:

HOMEPATH=Documents and SettingsOwner.LEGEND-A7R5PDTM

SESSIONNAME=Console

TMP=C:DOCUME~1OWNER~1.LEGLOCALS~1Temp

java_home=c:jdk1.5

windir=C:WINDOWS

ant_home=c:ant1.6

PROCESSOR_IDENTIFIER=x86 Family 15 Model 2 Stepping 4, GenuineIntel

SystemDrive=C:

USERPROFILE=C:Documents and SettingsOwner.LEGEND-A7R5PDTM

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

CommonProgramFiles=C:Program FilesCommon Files

NUMBER_OF_PROCESSORS=1

ComSpec=C:WINDOWSsystem32cmd.exe

COMPUTERNAME=ZZ3Z100

OS=Windows_NT

USERNAME=Owner

CLIENTNAME=Console

=ExitCode=00000000

TEMP=C:DOCUME~1OWNER~1.LEGLOCALS~1Temp

USERDOMAIN=ZZ3Z100

ALLUSERSPROFILE=C:Documents and SettingsAll Users.WINDOWS

PROCESSOR_LEVEL=15

SystemRoot=C:WINDOWS

classpath=c:jdk1.5lib;c:java

=C:=C:java

APPDATA=C:Documents and SettingsOwner.LEGEND-A7R5PDTMApplication Data

Path=C:WINDOWSsystem32;C:WINDOWS;C:WINDOWSSystem32Wbem;

c:jdk1.5bin;c:ant1.6bin

PROMPT=$P$G

PROCESSOR_REVISION=0204

ProgramFiles=C:Program Files

C:java>