java 获取文件夹大小，文件大小，文件个数

拼搏现实的明天。 2022-05-14 03:49 273阅读 0赞

http://blog.sina.com.cn/s/blog\_45096c6a0100btse.html

package tony;
    
    
    import java.io.File;
    import java.text.DecimalFormat;
    import java.io.FileInputStream;
    
    public class GetFileSize
    {
        public long getFileSizes(File f) throws Exception{//取得文件大小
            long s=0;
            if (f.exists()) {
                FileInputStream fis = null;
                fis = new FileInputStream(f);
               s= fis.available();
            } else {
                f.createNewFile();
                System.out.println("文件不存在");
            }
            return s;
        }
        // 递归
        public long getFileSize(File f)throws Exception//取得文件夹大小
        {
            long size = 0;
            File flist[] = f.listFiles();
            for (int i = 0; i < flist.length; i++)
            {
                if (flist[i].isDirectory())
                {
                    size = size + getFileSize(flist[i]);
                } else
                {
                    size = size + flist[i].length();
                }
            }
            return size;
        }
    
        public String FormetFileSize(long fileS) {//转换文件大小
            DecimalFormat df = new DecimalFormat("#.00");
            String fileSizeString = "";
            if (fileS < 1024) {
                fileSizeString = df.format((double) fileS) + "B";
            } else if (fileS < 1048576) {
                fileSizeString = df.format((double) fileS / 1024) + "K";
            } else if (fileS < 1073741824) {
                fileSizeString = df.format((double) fileS / 1048576) + "M";
            } else {
                fileSizeString = df.format((double) fileS / 1073741824) + "G";
            }
            return fileSizeString;
        }
       
        public long getlist(File f){//递归求取目录文件个数
            long size = 0;
            File flist[] = f.listFiles();
            size=flist.length;
            for (int i = 0; i < flist.length; i++) {
                if (flist[i].isDirectory()) {
                    size = size + getlist(flist[i]);
                    size--;
                }
            }
            return size;
    
        }
       
        public static void main(String args[])
        {
            GetFileSize g = new GetFileSize();
            long startTime = System.currentTimeMillis();
            try
            {
                long l = 0;
                String path = "C:\\WINDOWS";
                File ff = new File(path);
                if (ff.isDirectory()) { //如果路径是文件夹的时候
                    System.out.println("文件个数           " + g.getlist(ff));
                    System.out.println("目录");
                    l = g.getFileSize(ff);
                    System.out.println(path + "目录的大小为：" + g.FormetFileSize(l));
                } else {
                    System.out.println("     文件个数           1");
                    System.out.println("文件");
                    l = g.getFileSizes(ff);
                    System.out.println(path + "文件的大小为：" + g.FormetFileSize(l));
                }
               
            } catch (Exception e)
            {
                e.printStackTrace();
            }
            long endTime = System.currentTimeMillis();
            System.out.println("总共花费时间为：" + (endTime - startTime) + "毫秒...");
        }
    }

[用java删除文件夹里的所有文件][java]

import java.io.File;
    
    public class Test
    {
       public static void main(String args[]){
           Test t = new Test();
           delFolder("c:/bb");
           System.out.println("deleted");
    }
    
    //删除文件夹
    //param folderPath 文件夹完整绝对路径
    
         public static void delFolder(String folderPath) {
         try {
            delAllFile(folderPath); //删除完里面所有内容
            String filePath = folderPath;
            filePath = filePath.toString();
            java.io.File myFilePath = new java.io.File(filePath);
            myFilePath.delete(); //删除空文件夹
         } catch (Exception e) {
           e.printStackTrace(); 
         }
    }
    
    //删除指定文件夹下所有文件
    //param path 文件夹完整绝对路径
       public static boolean delAllFile(String path) {
           boolean flag = false;
           File file = new File(path);
           if (!file.exists()) {
             return flag;
           }
           if (!file.isDirectory()) {
             return flag;
           }
           String[] tempList = file.list();
           File temp = null;
           for (int i = 0; i < tempList.length; i++) {
              if (path.endsWith(File.separator)) {
                 temp = new File(path + tempList[i]);
              } else {
                  temp = new File(path + File.separator + tempList[i]);
              }
              if (temp.isFile()) {
                 temp.delete();
              }
              if (temp.isDirectory()) {
                 delAllFile(path + "/" + tempList[i]);//先删除文件夹里面的文件
                 delFolder(path + "/" + tempList[i]);//再删除空文件夹
                 flag = true;
              }
           }
           return flag;
         }
    }

[java]: http://www.blogjava.net/mrcmd/archive/2007/10/12/139003.html