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 printFileStore(FileStore store)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 main(String[] args)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