Java – How to get a file’s Media Type (MIME type)

javamime

How do you get a Media Type (MIME type) from a file using Java? So far I've tried JMimeMagic & Mime-Util. The first gave me memory exceptions, the second doesn't close its streams properly.

How would you probe the file to determine its actual type (not merely based on the extension)?

Best Answer

In Java 7 you can now just use Files.probeContentType(path).

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Java – How to efficiently iterate over each entry in a Java Map

Map<String, String> map = ...
for (Map.Entry<String, String> entry : map.entrySet()) {
    System.out.println(entry.getKey() + "/" + entry.getValue());
}

On Java 10+:

for (var entry : map.entrySet()) {
    System.out.println(entry.getKey() + "/" + entry.getValue());
}

Java – Does a finally block always get executed in Java

Yes, finally will be called after the execution of the try or catch code blocks.

The only times finally won't be called are:

If you invoke System.exit()
If you invoke Runtime.getRuntime().halt(exitStatus)
If the JVM crashes first
If the JVM reaches an infinite loop (or some other non-interruptable, non-terminating statement) in the try or catch block
If the OS forcibly terminates the JVM process; e.g., kill -9 <pid> on UNIX
If the host system dies; e.g., power failure, hardware error, OS panic, et cetera
If the finally block is going to be executed by a daemon thread and all other non-daemon threads exit before finally is called

Best Answer

Related Solutions

Java – How to efficiently iterate over each entry in a Java Map

Java – Does a finally block always get executed in Java

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