這個方法就是把文件的大小 formet成常用的文件格式,其實之間轉化就是1024的轉化
package com.zhangkeinfo.test;
import java.text.DecimalFormat;
/**
* 格式化文件文件大小
* @author spring sky
*
*/
public class FileSize {
public static void main(String[] args)throws Exception {
System.out.println(FormetFileSize(100));
System.out.println(FormetFileSize(1000));
System.out.println(FormetFileSize(10000));
System.out.println(FormetFileSize(100000));
System.out.println(FormetFileSize(1000000));
System.out.println(FormetFileSize(100000000));
System.out.println(FormetFileSize(1900000000));
}
/**得到文件的大小 */
public static String FormetFileSize(long fileS) {//轉換文件大小
DecimalFormat dfaaa = new DecimalFormat("#.00");
String fileSizeString = "";
if (fileS < 1024) {
fileSizeString = dfaaa.format((double) fileS) + "B";
} else if (fileS < 1048576) {
fileSizeString = dfaaa.format((double) fileS / 1024) + "K";
} else if (fileS < 1073741824) {
fileSizeString = dfaaa.format((double) fileS / 1048576) + "M";
} else {
fileSizeString = dfaaa.format((double) fileS / 1073741824) + "G";
}
return fileSizeString;
}
}
運行結果: