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      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 /*
     33  * This source code is provided to illustrate the usage of a given feature
     34  * or technique and has been deliberately simplified. Additional steps
     35  * required for a production-quality application, such as security checks,
     36  * input validation and proper error handling, might not be present in
     37  * this sample code.
     38  */
     39 
     40 
     41 import java.nio.file.*;
     42 import java.nio.file.attribute.*;
     43 import java.io.IOException;
     44 
     45 /**
     46  * Example utility that works like the df(1M) program to print out disk space
     47  * information
     48  */
     49 
     50 public class DiskUsage {
     51 
     52     static final long K = 1024;
     53 
     54     static void printFileStore(FileStore store) throws IOException {
     55         long total = store.getTotalSpace() / K;
     56         long used = (store.getTotalSpace() - store.getUnallocatedSpace()) / K;
     57         long avail = store.getUsableSpace() / K;
     58 
     59         String s = store.toString();
     60         if (s.length() > 20) {
     61             System.out.println(s);
     62             s = "";
     63         }
     64         System.out.format("%-20s %12d %12d %12d\n", s, total, used, avail);
     65     }
     66 
     67     public static void main(String[] args) throws IOException {
     68         System.out.format("%-20s %12s %12s %12s\n", "Filesystem", "kbytes", "used", "avail");
     69         if (args.length == 0) {
     70             FileSystem fs = FileSystems.getDefault();
     71             for (FileStore store: fs.getFileStores()) {
     72                 printFileStore(store);
     73             }
     74         } else {
     75             for (String file: args) {
     76                 FileStore store = Files.getFileStore(Paths.get(file));
     77                 printFileStore(store);
     78             }
     79         }
     80     }
     81 }
     82