以字节为单位获取文件的总大小[重复]

Possible Duplicate:
java get file size efficiently

可能重复：java有效地获取文件大小

I have a File called filename which is located in E://file.txt.

我有一个名为filename的文件，它位于E：//file.txt中。

FileInputStream fileinputstream = new FileInputStream(filename);

What I want to do is to calculate the size of this file in bytes. How can I have this done?

我想要做的是以字节为单位计算此文件的大小。我怎么能这样做？

4 个解决方案

#1

171

You can use the length() method on File which returns the size in bytes.

您可以在File上使用length（）方法，该方法返回以字节为单位的大小。

#2

You don't need FileInputStream to calculate file size, new File(path_to_file).length() is enough. Or, if you insist, use fileinputstream.getChannel().size().

您不需要FileInputStream来计算文件大小，新文件（path_to_file）.length（）就足够了。或者，如果你坚持，使用fileinputstream.getChannel（）。size（）。

#3

You can do that simple with Files.size(new File(filename).toPath()).

你可以使用Files.size（new File（filename）.toPath（））来做到这一点。

#4

public static void main(String[] args) {
        try {
            File file = new File("test.txt");
            System.out.println(file.length());
        } catch (Exception e) {
        }
    }

#1

171