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 Settings/Owner.LEGEND-A7R5PDTM
SESSIONNAME=Console
TMP=C:/DOCUME~1/OWNER~1.LEG/LOCALS~1/Temp
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 Settings/Owner.LEGEND-A7R5PDTM
PATHEXT=.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH
CommonProgramFiles=C:/Program Files/Common Files
NUMBER_OF_PROCESSORS=1
ComSpec=C:/WINDOWS/system32/cmd.exe
COMPUTERNAME=ZZ3Z100
OS=Windows_NT
USERNAME=Owner
CLIENTNAME=Console
=ExitCode=00000000
TEMP=C:/DOCUME~1/OWNER~1.LEG/LOCALS~1/Temp
USERDOMAIN=ZZ3Z100
ALLUSERSPROFILE=C:/Documents and Settings/All Users.WINDOWS
PROCESSOR_LEVEL=15
SystemRoot=C:/WINDOWS
classpath=c:/jdk1.5/lib;c:/java
=C:=C:/java
APPDATA=C:/Documents and Settings/Owner.LEGEND-A7R5PDTM/Application Data
Path=C:/WINDOWS/system32;C:/WINDOWS;C:/WINDOWS/System32/Wbem;
c:/jdk1.5/bin;c:/ant1.6/bin
PROMPT=$P$G
PROCESSOR_REVISION=0204
ProgramFiles=C:/Program Files
C:/java>