如何在Java中使用FileNameMap接口? [英] How to use FileNameMap interface in Java?

问题描述

此接口提供一种方法，即getContentTypeFor(String fileName).但是，我不知道如何使用它.我在Eclipse中实现了界面并以:

This interface provides one method, namely getContentTypeFor(String fileName). However, I have no idea how to use it. I implemented interface in Eclipse and ended with:

import java.net.FileNameMap;

public class Fnam implements FileNameMap {

public static void main(String[] args) {

}

@Override
public String getContentTypeFor(String fileName) {
    return null;
}
}

该方法返回null.我应该如何更改它以获得MIME类型?

The method returns null. How should I change it to get the MIME type ?

推荐答案

它是JDK内部实现的接口，在大多数情况下，您应该仅使用接口实现，而不是接口本身.

It is interface for inner implementation of JDK, and in most cases you should use just interface implementation, not interface itself.

以下是简单的用法示例:

Here simple sample of usage:

public class Main {
    private static FileNameMap fileNameMap = URLConnection.getFileNameMap();

    public static void main(String... str) {
        System.out.print(fileNameMap.getContentTypeFor("my_file.xml"));
    }

}

打印:

application/xml

和似乎仅只是JDK中该接口的当前实现.

And seems only MimeTable is only current implementation of that interface in JDK.

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