如何获取以MB为单位的文件大小(兆字节)? [英] How to get the size of a file in MB (Megabytes)?

问题描述

我在服务器上有一个zip文件.

I have a zip file on a server.

如何检查文件大小是否大于27 MB?

How can I check if the file size is larger than 27 MB?

File file = new File("U:\intranet_root\intranet\R1112B2.zip");
if (file > 27) {
   //do something
}

推荐答案

使用 File 类的 length()方法返回文件大小(以字节为单位)

Use the length() method of the File class to return the size of the file in bytes.

// Get file from file name
File file = new File("U:\intranet_root\intranet\R1112B2.zip");

// Get length of file in bytes
long fileSizeInBytes = file.length();
// Convert the bytes to Kilobytes (1 KB = 1024 Bytes)
long fileSizeInKB = fileSizeInBytes / 1024;
// Convert the KB to MegaBytes (1 MB = 1024 KBytes)
long fileSizeInMB = fileSizeInKB / 1024;

if (fileSizeInMB > 27) {
  ...
}

您可以将转换合并为一个步骤，但是我试图充分说明这一过程.

You could combine the conversion into one step, but I've tried to fully illustrate the process.

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