Java:统计目录下文件的信息（名称和大小）

package pipi1;

import java.io.*;

import java.text.DecimalFormat;

 

public class DirInfo {

       private static void ShowDirInformation(File list[]) {

              try {

                     DecimalFormat formatTool = new DecimalFormat("#.00");

                     //文件的大小保留两位小数

                     FileWriter fw = new FileWriter("E://aillo.txt");

                     //将统计后的信息写入E://aillo.txt文件中

                     PrintWriter pw = new PrintWriter(new BufferedWriter(fw));

                     double size = 0.00000;

                     for (int i = 0; i < list.length; i++) {

                            if (!list[i].isDirectory()) {

                                   //判断是目录，还是文件

                                   pw.print(list[i].getName());

                                   size = list[i].length();

                                   pw.println(":  " + formatTool.format(size / 1024)+" KB");

                                   //   "size/1024"文件大小以KB为单位

                            }

                     }

                     pw.close();// 关闭输出流

              }

              catch (Exception e) {

                     System.out.println(e);

              }

       }

       public static void main(String args[]) {

              File dir_path = new File("F://");//统计F盘根目录下的文件信息

              if (dir_path.exists())

                     ShowDirInformation(dir_path.listFiles());

              else

                     System.out.println("The directory is not exist!");

       }

}