What is .mime.types file?

.mime.types is a configuration file stored in user's home directory to provide custom mapping between file MIME types and file name extension.

For example, the following .mime.types file in the "fyicenter" home directory maps two MIME types to different file name extensions. Fields in .mime.types file are separated by white spaces.

fyicenter> type c:\users\fyicenter\.mime.types 

text/plain   txt text TXT TEXT java
image/jpeg   jpg jpeg JPG JPEG

If you run the JAF sample progam, ActivationTest.java, given in the previous tutorial with the above ".mime.types" file in the home directory, you will see:

fyicenter> java -version
java version "17.0.5" 2022-10-18 LTS

fyicenter> javac -classpath .:javax.activation-1.2.0.jar ActivationTest.java

fyicenter> java -classpath .:javax.activation-1.2.0.jar ActivationTest ActivationTest.java
getName() = ActivationTest.java
getContentType() = text/plain

The output shows that the MIME type of "ActivationTest.java" is "text/plain", according to mappings given the ".mime.types" file.

⇒ JAF 1.2.0 JAR File - javax.activation-1.2.0.jar

⇐ Test Program on java.activation.DataSource

⇑ Downloading activation.jar - JavaBeans Activation Framework

⇑⇑ activation.jar - JAF (JavaBeans Activation Framework)