{"id":122,"date":"2007-08-10T21:55:00","date_gmt":"2007-08-10T21:55:00","guid":{"rendered":"https:\/\/zofxare.com\/zofxare\/blog\/2007\/08\/10\/how-to-get-user-defined-environment-variable-in-java\/"},"modified":"2007-08-10T21:55:00","modified_gmt":"2007-08-10T21:55:00","slug":"how-to-get-user-defined-environment-variable-in-java","status":"publish","type":"post","link":"https:\/\/zofxare.com\/zofxare\/blog\/2007\/08\/10\/how-to-get-user-defined-environment-variable-in-java\/","title":{"rendered":"How to get user defined environment variable in Java"},"content":{"rendered":"

I’m porting a C++ library over to Java 1.4.2 and I need to get the setting for a user defined environment variable. There used to be a very easy way, but it turns out some brilliant people decided to deprecate – get rid of – System.getenv for java 1.4. There must have been complaints because for Java 1.5 System.getenv is undeprecated. Unfortunately, I can’t guarantee the users of my java software will be using java 1.5. Fortunately, there are people much smarter than I. I did some searching and found a website with some code which determines what system you are on and then calls the corresponding function to get all environment variables. You can then make a call to get the value of the environment variable you need. Here’s the link <\/a>to the site and the code itself:<\/p>\n

import java.io.*;
import java.util.*;<\/p>\n

public class ReadEnv {
public static Properties getEnvVars() throws Throwable {
Process p = null;
Properties envVars = new Properties();
Runtime r = Runtime.getRuntime();
String OS = System.getProperty(“os.name”).toLowerCase();
\/\/ System.out.println(OS);
if (OS.indexOf(“windows 9”) > -1) {
p = r.exec( “command.com \/c set” );
}
else if ( (OS.indexOf(“nt”) > -1)
|| (OS.indexOf(“windows 2000”) > -1 )
|| (OS.indexOf(“windows xp”) > -1) ) {
\/\/ thanks to JuanFran for the xp fix!
p = r.exec( “cmd.exe \/c set” );
}
else {
\/\/ our last hope, we assume Unix (thanks to H. Ware for the fix)
p = r.exec( “env” );
}
BufferedReader br = new BufferedReader
( new InputStreamReader( p.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 );
\/\/ System.out.println( key + ” = ” + value );
}
return envVars;
}<\/p>\n

public static void main(String args[]) {
try {
Properties p = ReadEnv.getEnvVars();
System.out.println(“the current value of TEMP is : ” +
p.getProperty(“TEMP”));
}
catch (Throwable e) {
e.printStackTrace();
}
}
}<\/p>\n

Java Resources<\/a>\"\"<\/p>\n","protected":false},"excerpt":{"rendered":"

I’m porting a C++ library over to Java 1.4.2 and I need to get the setting for a user defined environment variable. There used to be a very easy way, but it turns out some brilliant people decided to deprecate – get rid of – System.getenv for java 1.4. There must have been complaints because […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"nf_dc_page":"","om_disable_all_campaigns":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[261],"tags":[],"class_list":["post-122","post","type-post","status-publish","format-standard","hentry","category-how-to-get-user-defined-environment-variable-in-java"],"yoast_head":"\nHow to get user defined environment variable in Java - Zofxare Blog Home<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/zofxare.com\/zofxare\/blog\/2007\/08\/10\/how-to-get-user-defined-environment-variable-in-java\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to get user defined environment variable in Java - Zofxare Blog Home\" \/>\n<meta property=\"og:description\" content=\"I’m porting a C++ library over to Java 1.4.2 and I need to get the setting for a user defined environment variable. There used to be a very easy way, but it turns out some brilliant people decided to deprecate – get rid of – System.getenv for java 1.4. 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