CODEWITHSUNDEEP
java
Andy
Andy

Reputation: 3682

How to get the name of a Java program?

I'm creating an application that could be either an .exe or a .jar and I need to know which it is. Does anyone know how I can get the file name/extension of a program running in Java please? I can get the path of the program running but I can't get the name.

Upvotes: 12

Views: 24771

Answers (3)

Augusto Zumbi Rodrigues
Augusto Zumbi Rodrigues

Reputation: 1

This snippet below should do the trick:

try {
    Class cls = Class.forName(getClass().getCanonicalName());
    ClassLoader cLoader = cls.getClassLoader();
    String nomeDaClasse=cls.getCanonicalName().replace(".", "/").concat(".class");
    System.out.println("nomeDaClasse = "+ nomeDaClasse);
    String urlClasseJava = cLoader.getSystemResource(nomeDaClasse).toString();
    _nomeArquivoJava=urlClasseJava.substring("jar:file:".length(), urlClasseJava.indexOf("!/"));
    System.out.println("_nomeArquivoJava = "+ _nomeArquivoJava);  
}
catch(Exception e) {
    e.printStackTrace();
}

The output will look like this:

$ java -jar CasaInformatizada-0.1.4.jar  
dez 03, 2020 5:27:49 PM br.com.cvra.monitorArduino.Principal subirEscrivao
INFORMAÇÕES: /var/tmp/monitorArduino.xml
nomeDaClasse = br/com/cvra/monitorArduino/Principal.class
_nomeArquivoJava = /var/tmp/CasaInformatizada-0.1.4.jar

This is based upon the follow sources:

https://www.infoworld.com/article/2077485/java-tip-120--execute-self-extracting-jars.html https://www.tutorialspoint.com/java/lang/classloader_getsystemresource.htm

Upvotes: 0

Michael Borgwardt
Michael Borgwardt

Reputation: 346260

The actual program running the JAR file would be java.exe.

I suggest you approach the problem from a completely different angle and have the exe wrapper set a system property that the program queries. Or you could have it and the JAR manifest specify different main classes.

Upvotes: 5

Victor Sorokin
Victor Sorokin

Reputation: 11996

Make 'name of program' a property that is passed to your program via '-D' command-line switch, like so

java -Dprogram.name=myApp.jar -jar myApp.jar

Read it in your code like so

if ("myApp.jar".equals(System.getProperty("program.name"))) {
   // perform appropriate actions...
}

Upvotes: 5

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