UploadFileUtils.java

package cn.com.polysoft.utils;

import java.text.DecimalFormat;

public class UploadFileUtils {

    //计算文件大小
    public static String getFileSize(long filesize){
        String size = "";
        DecimalFormat df = new DecimalFormat("#.00");
        if (filesize < 1024) {
            size = df.format((double) filesize) + "BT";
        } else if (filesize < 1048576) {
            size = df.format((double) filesize / 1024) + "KB";
        } else if (filesize < 1073741824) {
            size = df.format((double) filesize / 1048576) + "MB";
        } else {
            size = df.format((double) filesize / 1073741824) + "GB";
        }
        return size;
    }
}