1 /*
   2  * Copyright (c) 2008, 2011, Oracle and/or its affiliates. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  *
   8  *   - Redistributions of source code must retain the above copyright
   9  *     notice, this list of conditions and the following disclaimer.
  10  *
  11  *   - Redistributions in binary form must reproduce the above copyright
  12  *     notice, this list of conditions and the following disclaimer in the
  13  *     documentation and/or other materials provided with the distribution.
  14  *
  15  *   - Neither the name of Oracle nor the names of its
  16  *     contributors may be used to endorse or promote products derived
  17  *     from this software without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
  20  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  21  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  23  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  24  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  25  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  26  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  27  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  28  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  29  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  */
  31 
  32 import java.nio.file.*;
  33 import java.nio.file.attribute.*;
  34 import java.io.IOException;
  35 
  36 /**
  37  * Example utility that works like the df(1M) program to print out disk space
  38  * information
  39  */
  40 
  41 public class DiskUsage {
  42 
  43     static final long K = 1024;
  44 
  45     static void printFileStore(FileStore store) throws IOException {
  46         long total = store.getTotalSpace() / K;
  47         long used = (store.getTotalSpace() - store.getUnallocatedSpace()) / K;
  48         long avail = store.getUsableSpace() / K;
  49 
  50         String s = store.toString();
  51         if (s.length() > 20) {
  52             System.out.println(s);
  53             s = "";
  54         }
  55         System.out.format("%-20s %12d %12d %12d\n", s, total, used, avail);
  56     }
  57 
  58     public static void main(String[] args) throws IOException {
  59         System.out.format("%-20s %12s %12s %12s\n", "Filesystem", "kbytes", "used", "avail");
  60         if (args.length == 0) {
  61             FileSystem fs = FileSystems.getDefault();
  62             for (FileStore store: fs.getFileStores()) {
  63                 printFileStore(store);
  64             }
  65         } else {
  66             for (String file: args) {
  67                 FileStore store = Files.getFileStore(Paths.get(file));
  68                 printFileStore(store);
  69             }
  70         }
  71     }
  72 }