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javalearner

java1.5中访问环境变量，使用System.getenv()可以访问环境变量。如：

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：  
  
   
   
   

   
  

  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:jdk1.5in;c:ant1.6in
PROMPT=$P$G
PROCESSOR_REVISION=0204
ProgramFiles=C:Program Files

C:java>