使用Java识别文件扩展名 [英] identify the file extension using java

问题描述

我在数据库中有不同的格式文件.我想复制到我的本地计算机上.

i have different format files in DB. i want to copy to my local machine.

我如何识别文件格式(doc，xls等...)

how can i identify the file format (doc, xls, etc...)

关于，克里希纳

感谢您提供建议...根据您的建议，我编写了代码&我完成了...

Thanks, for providing suggestions... based on your suggestions i had written the code & i am completed...

请查看我的博客..我在此处发布了代码...

please look into my blog.. i posted the code over here...

http://muralie39.wordpress.com/java-program-to-copy-files-from-oracle-to-localhost/

谢谢你们.

谢谢，克里希纳

推荐答案

如果文件是按照约定命名的，则只需解析文件名即可:

If your files are named according to convention, you can just parse the filename:

String filename = "yourFileName";
int dotPosition = filename.lastIndexOf(".");
String extension = "";
if (dotPosition != -1) {
    extension = filename.substring(dotPosition);
}
System.out.println("The file is of type: " + extension);

这是最简单的方法，假设您的文件是使用某种标准命名约定来命名的.扩展可能是您系统专有的，即使它们遵循约定也可以使用.

That's the simplest approach, assuming your files are named using some kind of standard naming convention. The extensions could be proprietary to your system, even, as long as they follow a convention this will work.

如果您需要实际扫描文件以获取格式信息，则需要对文档格式进行更多调查.

If you need to actually scan the file to get the format information, you will need to do some more investigation into document formats.

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