Printing the Windows environment variables and their values to System Console (and file) using Java
Kushal Paudyal February 16th, 2012.This post has 172 views
In the following Java tool, I have demonstrated two things:
- How to print all the Windows Variables using Java runtime onto the System Console. (You can modify this code to print those variables and their values to a file. See our previous tutorial for some help on printing String to file)
- How to get the value of a specific windows variable using Java runtime
This program is capable of identifying few variations of Windows OS. The following OS are supported by this code:
- Windows NT
- Windows 2000
- Windows XP
- Windows 9* (e.g. Windows 95, Windows 98
Here is the source code:
package com.kushal.tools;
/**
* @Author Kushal Paudyal
* Created on 2012-01-30
* Last Modified on 2012-01-30
*
* Tool to print the windows environment variables.
* Can also be used to print the value of a specific
* windows variable.
*/
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Properties;
public class WindowsEnvironmentVariablesPrinter {
public static void main(String[] args) {
Properties prop = WindowsEnvironmentVariablesPrinter
.getEnvironmentVariables();
/**
* Print out all the properties to System Console
*/
prop.list(System.out);
/**
* Print the value of a specific variable.
* In this case, we will be printing the value of "TEMP"
* variable.
*/
System.out.println("\n\nValue of varible TEMP is : "
+ prop.getProperty("TEMP"));
}
public static Properties getEnvironmentVariables() {
Process myProcess = null;
Properties envVars = new Properties();
try {
/**Get a runtime**/
Runtime runtime = Runtime.getRuntime();
/**Get the String value of operating system name*/
String operatingSystem = System.getProperty("os.name").toLowerCase();
/**
* If it is Windows 9 Operating System, execute the command
* 'command.com /c set'
*/
if (operatingSystem.indexOf("windows 9") > -1) {
myProcess = runtime.exec("command.com /c set");
}
/**
* If it is Windows NT or Windows 2000 or Windows XP, execute the command
* 'cmd.exe /c set'
*/
else if ((operatingSystem.indexOf("nt") > -1)
|| (operatingSystem.indexOf("windows 2000") > -1)
|| (operatingSystem.indexOf("windows xp") > -1)) {
myProcess = runtime.exec("cmd.exe /c set");
}
/**
* If does not match any of those, just run the command
* 'env'
*/
else {
myProcess = runtime.exec("env");
}
/**
* The following block reads the output and creates a
* key value pair for the environment variables.
*/
BufferedReader br = new BufferedReader(new InputStreamReader(
myProcess.getInputStream()));
String line;
while ((line = br.readLine()) != null) {
int idx = line.indexOf('=');
String key = line.substring(0, idx);
String value = line.substring(idx + 1);
envVars.setProperty(key, value);
}
} catch (Throwable e) {
e.printStackTrace();
}
return envVars;
}
}
The output of this program when I ran this on my PC:
-- listing properties -- UATDATA=C:\WINXP\system32\CCM\UATData\D9F8C39... CLIENTNAME=Console PROCESSOR_ARCHITECTURE=x86 NUT_SUFFIXED_SEARCHING=1 TSMPATH=C:\Program Files\ThinkPad\UltraNav Ut... FP_NO_HOST_CHECK=NO RATL_RTHOME=C:\Program Files\Rational\Rational Test DB2TEMPDIR=C:\PROGRA~1\IBM\SQLLIB\ ANT_HOME=C:\build2\tools\apache-ant-1.7.1 TVTPYDIR=C:\Program Files\Common Files\Lenovo\... MQ_JAVA_INSTALL_PATH=C:\Program Files\IBM\WebSphere MQ\Java TMP=C:\DOCUME~1\billgates\LOCALS~1\Temp TVT=C:\Program Files\Lenovo CLEARCASE_PRIMARY_GROUP=NWIE\UG$ICAClearUsers COMPUTERNAME=BILLGATESCOMPUTER M2=C:\maven\bin OS=Windows_NT IBMLDAP_ALTHOME=C:\Program Files\Rational\common\codeset RR=C:\Program Files\Lenovo\Rescue and Re... PROMPT=$P$G notestmp1=C:\DOCUME~1\billgates\LOCALS~1\Temp\not... SystemDrive=C: TPTP_AC_HOME=C:\Program Files\IBM\SDPShared\plugin... HOMEDRIVE=C: LOGONSERVER=\\PMM0201 PROCESSOR_IDENTIFIER=x86 Family 6 Model 37 Stepping 5, Gen... ProgramFiles=C:\Program Files DB2INSTANCE=DB2 NUMBER_OF_PROCESSORS=4 TEMP=C:\DOCUME~1\billgates\LOCALS~1\Temp USERDOMAIN=MSOFT M2_HOME=C:\maven INCLUDE=C:\PROGRA~1\IBM\SQLLIB\INCLUDE;C:\PRO... NUTSUFFIX=1 HOME=C:\Documents and Settings\billgates MQ_JAVA_DATA_PATH=C:\Program Files\IBM\WebSphere MQ TMPDIR=C:\DOCUME~1\billgates\LOCALS~1\Temp SMA=C:\Program Files\ThinkVantage\SMA\ IBM_JAVA_COMMAND_LINE=C:\Program Files\IBM\SDP\jdk\jre\bin\... PROCESSOR_LEVEL=6 USERDNSDOMAIN=NWIE.NET VSEDEFLOGDIR=C:\Documents and Settings\All Users\A... Path=C:\Program Files\IBM\WebSphere MQ\Jav... SESSIONNAME=Console USERNAME=billgates LIB=;C:\PROGRA~1\IBM\SQLLIB\LIB PATHEXT=.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JS... DEFLOGDIR=C:\Documents and Settings\All Users\A... ComSpec=C:\WINXP\system32\cmd.exe SystemRoot=C:\WINXP TVTCOMMON=C:\Program Files\Common Files\Lenovo windir=C:\WINXP PROBEKIT_HOME=C:\Program Files\IBM\SDPShared\plugin... PROCESSOR_REVISION=2505 USERPROFILE=C:\Documents and Settings\billgates CommonProgramFiles=C:\Program Files\Common Files APPDATA=C:\Documents and Settings\billgates\App... HOMEPATH=\Documents and Settings\billgates TISDIR=C:\Program Files\Rational\common JAVA_HOME=C:\Program Files\IBM\SDP\runtimes\bas... ALLUSERSPROFILE=C:\Documents and Settings\All Users CLASSPATH=C:\Program Files\IBM\WebSphere MQ\Jav... SWSHARE=C:\SWSHARE Value of varible TEMP is : C:\DOCUME~1\billgates\LOCALS~1\Temp
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