How to write a simple test program on java.activation.DataSource? I want to try the JAF (JavaBeans Activation Framework) included in JDK.

JAF (JavaBeans Activation Framework) API 1.1 has been included in JDK since 1.6. You use the following simple test program, DataSourceTest.java, to try it:

// Copyright (c) 2015 FYIcenter.com
import javax.activation.*;
public class DataSourceTest {
   public static void main(String[] args) 
      throws Exception {
      String filename = args[0];
      DataSource ds = new FileDataSource(filename);
      System.out.println("getName() = "+ds.getName() );
      System.out.println("getContentType() = "
         +ds.getContentType() );
   }
}

Compile and run with only JDK and no activation.jar:

\fyicenter>java -version
java version "1.7.0_45"

\fyicenter>javac -classpath . DataSourceTest.java

\fyicenter>java -classpath . DataSourceTest
getName() = DataSourceTest.java
getContentType() = application/octet-stream

The above session shows that my JAF configuration does not recognize *.java files as text files. Here is how to change the JAF configuration:

Edit .mime.types in my home folder c:\users\fyicenter and add the following line. Then run the test program again:

\fyicenter>edit c:\users\fyicenter\.mime.types 
text/plain		txt text TXT TEXT java

\fyicenter>java -classpath . DataSourceTest
getName() = DataSourceTest.java
getContentType() = text/plain

Note that the .mime.types file defines mapping of a MIME types with file extensions with a tab character.

Back to FAQ for JAF (JavaBeans Activation Framework).