new MailcapCommandMap()
import javax.activation.CommandInfo; import javax.activation.MailcapCommandMap; public class Main { public static void main(String[] args) { MailcapCommandMap mailcapCommandMap = new MailcapCommandMap(); String[] mimeTypes = mailcapCommandMap.getMimeTypes(); for (String mimeType : mimeTypes) { System.out.println(mimeType); CommandInfo[] commandInfos = mailcapCommandMap.getAllCommands(mimeType); for (CommandInfo info : commandInfos) { System.out.println(" " + info.getCommandName() + " : " + info.getCommandClass()); } } } }