java如何在下载期间显示用户友好的格式化输出关于带宽速度 [英] java how to show user friendly formatted output regarding bandwidth speed during download

问题描述

想要在下载期间显示带宽速度的格式良好的输出

Want to show nicely formatted output regarding bandwidth speed during download

下面我有这个计算，谢谢@Tomasz Nurkiewicz，它显示

当我下载一个文件时，每秒的兆字节 *兆字节。

I have this calculation below thanks to @Tomasz Nurkiewicz, and it show
mega*bytes* per second when i download a file.

long start = System.nanoTime();
long totalRead = 0;
final double NANOS_PER_SECOND = 1000000000.0;
final double BYTES_PER_MIB = 1024 * 1024;

    while ((val = bis.read(buffer, 0, 1024)) > 0) {
        //...
        totalRead += val;
        double speed = NANOS_PER_SECOND / BYTES_PER_MIB * totalRead / (System.nanoTime() - start + 1)
    }

希望像这样。我从
计算得到mega * 字节 *，从那里我输入一个 if语句在
上选择KByte / s，MBit / s（不确定）或就像普通FTP客户端显示速度一样。

Would like it to be like this. I get mega*bytes* per second from the calculation and from that i enter a if statement to select on KByte/s, MBit/s (not sure) or just like a normal FTP client show speed.

if( KByte/s something) {
   System.out.print(your current speed xx KB/s);
}else if(MByte/s something){
   System.out.print(your current speed xx MB/s);
}

我的问题是我在if语句中添加什么？

My problem is what do i put in the if statement?.

希望你明白我想做什么

推荐答案

Apache Commons IO 中的FileUtils.byteCountToDisplaySize（） 方法：

There is a FileUtils.byteCountToDisplaySize() method in Apache Commons IO:

System.out.println(
  "your current speed is " + FileUtils.byteCountToDisplaySize(12345) + "/s"
)

// your current speed is 12 KB/s

另请参阅（可能的重复）：

Also see (possible duplicates):

• 如何在java中将字节大小转换为人类可读格式？


• 将文件大小格式化为MB，GB等

• How to convert byte size into human readable format in java?
• Format file size as MB, GB etc

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