java根据字节数B转成合适的单位，工具类

Posted 2022-08-23 爱米酱

public class beautifySizeUtil 
  public static String beautifySize(double size) 
    if (size <= 0) return "0";
    final String[] units = new String[]"B", "KB", "MB", "GB", "TB";
    int digitGroups = (int) (Math.log10(size) / Math.log10(1024));
    return new DecimalFormat("#,##0.#").format(size / Math.pow(1024, digitGroups)) + "" + units[digitGroups];
  
  
  public static String beautifySize(long size) 
    if (size <= 0) return "0";
    final String[] units = new String[]"B", "KB", "MB", "GB", "TB";
    int digitGroups = (int) (Math.log10(size) / Math.log10(1024));
    return new DecimalFormat("#,##0.#").format(size / Math.pow(1024, digitGroups)) + "" + units[digitGroups];
  
  
  //返回该B对应的美化单位
  public static String beautifyUnit(long size) 
    if (size <= 0) return "B";
    final String[] units = new String[]"B", "KB", "MB", "GB", "TB";
    int digitGroups = (int) (Math.log10(size) / Math.log10(1024));
    return  units[digitGroups];
  
  
  
  //B转KB
  public static String beautifyKb(long size) 
    DecimalFormat df = new DecimalFormat("#.00");
    String beauSize = "";
    beauSize = df.format((double) size / 1024);
    return beauSize;
  
  //B转MB
  public static String beautifyMb(long size) 
    DecimalFormat df = new DecimalFormat("#.00");
    String beauSize = "";
    beauSize = df.format((double) size / 1048576);
    return beauSize;
  
  //B转GB
  public static String beautifyGb(long size) 
    DecimalFormat df = new DecimalFormat("#.00");
    String beauSize = "";
    beauSize = df.format((double) size / 1073741824);
    return beauSize;
  
  //B转TB
  public static String beautifyTb(long size) 
    DecimalFormat df = new DecimalFormat("#.00");
    String beauSize = "";
    beauSize = df.format((double) size / 1099511627776L);
    return beauSize;
  
  
  public static void main(String[] args) 
    System.out.println(beautifySize(1));
    System.out.println(beautifySize(2048));
      System.out.println(beautifySize(200000));
      System.out.println(beautifySize(200000000));
      System.out.println(beautifySize(2000000000));
  

执行结果：