Passing on command line arguments to runnable JAR

Question

I built a runnable JAR from an Eclipse project that processes a given XML file and extracts the plain text   However  this version requires that the file be hard-coded in the code   Is there a way to do something like this  java -jar wiki2txt enwiki-20111007-pages-articles xml   and have the jar execute on the xml file   I ve done some looking around  and all the examples given have to do with compiling the JAR on the command line  and none deal with passing in arguments

User · Answer

You can pass program arguments on the command line and get them in your Java app like this:

public static void main(String[] args) {
  String pathToXml = args[0];
....
}

Alternatively you pass a system property by changing the command line to:

java -Dpath-to-xml=enwiki-20111007-pages-articles.xml -jar wiki2txt

and your main class to:

public static void main(String[] args) {
  String pathToXml = System.getProperty("path-to-xml");
....
}

User · Answer

When you run your application this way  the java excecutable read the MANIFEST inside your jar and find the main class you defined  In this class you have a static method called main  In this method you may use the command line arguments

User · Answer

You can also set a Java property  i e  environment variable  on the command line and easily use it anywhere in your code   The command line would be done this way      c    java -jar -Dmyvar enwiki-20111007-pages-articles xml wiki2txt    and the java code accesses the value like this   String context   System getProperty  myvar       See this question about argument passing in Java

User · Answer

Why not    Just modify your Main-Class to receive arguments and act upon the argument   public class wiki2txt        public static void main String   args               String fileName   args 0                 Use FileInputStream  BufferedReader etc here             Specify the full path in the commandline   java -jar wiki2txt  home bla enwiki-    xml

[java] Passing on command line arguments to runnable JAR

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