如何通过 Ant - Swing 传递 jvm 参数

Question

I want to pass the JVM argument -Dfile.encoding=UTF-8 to my swing application using Ant script, I'm using eclipse and I'm looking for the minimum Ant script content to do this. this is my first use of ant buildfile.

Answer 1

If you are using ant's java task to launch app, then see its <jvmarg >.. options. You have to set fork to true, so that application runs under a new process with appropriate system properties set.

Answer 2

I assume you want to build a jar file containing your application. It is however not possible to specify a run-time system property when doing so. For an overview of JAR structure, see http://docs.oracle.com/javase/7/docs/technotes/guides/jar/jar.html - though it is possible to specify a main class of your application, it is not possible to set any parameters for it.

To set the system property to JVM upon your application start, you can do one of:

Set the property in code, eg in a static initialization code on your main class:

static {
 System.setProperty("file.encoding", "UTF-8"); }

Or, pass it as a command line parameter when starting your JAR:

java -Dfile.encoding=UTF-8 -jar yourapp.jar 

Answer 3

just in case anyone is using run.xml then add this line to pass argument to jar file, <jvmarg value="-Dfile.encoding=UTF-8"/> inside the Java node.