1 | /** |
---|
2 | * $Id: FileCopy2.java,v 1.1 2001/01/15 15:38:47 pn Exp $ |
---|
3 | * Taken from Fred Lavigne (fred.lavigne.com), who evidently borrowed it |
---|
4 | * from Jamie Hall. |
---|
5 | */ |
---|
6 | |
---|
7 | package flafi.util; |
---|
8 | |
---|
9 | import java.io.*; |
---|
10 | |
---|
11 | /** |
---|
12 | * This class can be used for copying files and/or directories in Java. |
---|
13 | * I wrote it because, for some reason, there is no java.io.File.copy() |
---|
14 | * method. It can be used to copy file->file, file->directory, or |
---|
15 | * directory->directory. The copy method is static, and thus this class |
---|
16 | * should not be instantiated.<p> |
---|
17 | * |
---|
18 | * You may study, use, modify, and distribute this code for any purpose. |
---|
19 | * This code is provided <b>WITHOUT WARRANTY</b> either expressed or |
---|
20 | * implied.<p> |
---|
21 | * |
---|
22 | * Download the <a href="FileCopy.java">source</a>, or the compiled |
---|
23 | * <a href="FileCopy.class">class</a>.<p> |
---|
24 | * |
---|
25 | * <i>Jamie Hall</i>, copyright (c) 1996.<br> |
---|
26 | * <a href="mailto:jamihall@mhv.net">jamihall@mhv.net</a><br> |
---|
27 | * <a href="http://www.mhv.net/~jamihall">http://www.mhv.net/~jamihall</a> |
---|
28 | * |
---|
29 | * @version 1.1, January 1, 1996 |
---|
30 | * @author Jamie Hall |
---|
31 | */ |
---|
32 | |
---|
33 | final public class FileCopy2 { |
---|
34 | |
---|
35 | |
---|
36 | /** |
---|
37 | * This class shouldn't be instantiated. |
---|
38 | */ |
---|
39 | private FileCopy2() { |
---|
40 | } |
---|
41 | |
---|
42 | |
---|
43 | /** |
---|
44 | * Copy files and/or directories. |
---|
45 | * |
---|
46 | * @param src source file or directory |
---|
47 | * @param dest destination file or directory |
---|
48 | * @exception IOException if operation fails |
---|
49 | */ |
---|
50 | public static void copy(File src, File dest) throws IOException { |
---|
51 | |
---|
52 | FileInputStream source = null; |
---|
53 | FileOutputStream destination = null; |
---|
54 | byte[] buffer; |
---|
55 | int bytes_read; |
---|
56 | |
---|
57 | // Make sure the specified source exists and is readable. |
---|
58 | if (!src.exists()) |
---|
59 | throw new IOException("source not found: " + src); |
---|
60 | if (!src.canRead()) |
---|
61 | throw new IOException("source is unreadable: " + src); |
---|
62 | |
---|
63 | if (src.isFile()) { |
---|
64 | if (!dest.exists()) { |
---|
65 | File parentdir = parent(dest); |
---|
66 | if (!parentdir.exists()) |
---|
67 | parentdir.mkdirs(); // Make all directories, and not just the immediate parent |
---|
68 | } |
---|
69 | else if (dest.isDirectory()) { |
---|
70 | dest = new File(dest + File.separator + src); |
---|
71 | } |
---|
72 | } |
---|
73 | else if (src.isDirectory()) { |
---|
74 | if (dest.isFile()) |
---|
75 | throw new IOException("cannot copy directory " + src + " to file " + dest); |
---|
76 | if (!dest.exists()) |
---|
77 | dest.mkdirs(); // Make all directories, and not just the immediate parent |
---|
78 | } |
---|
79 | |
---|
80 | // The following line requires that the file already |
---|
81 | // exists!! Thanks to Scott Downey (downey@telestream.com) |
---|
82 | // for pointing this out. Someday, maybe I'll find out |
---|
83 | // why java.io.File.canWrite() behaves like this. Is it |
---|
84 | // intentional for some odd reason? |
---|
85 | //if (!dest.canWrite()) |
---|
86 | //throw new IOException("destination is unwriteable: " + dest); |
---|
87 | |
---|
88 | // If we've gotten this far everything is OK and we can copy. |
---|
89 | if (src.isFile()) { |
---|
90 | try { |
---|
91 | source = new FileInputStream(src); |
---|
92 | destination = new FileOutputStream(dest); |
---|
93 | buffer = new byte[1024]; |
---|
94 | while(true) { |
---|
95 | bytes_read = source.read(buffer); |
---|
96 | if (bytes_read == -1) break; |
---|
97 | destination.write(buffer, 0, bytes_read); |
---|
98 | } |
---|
99 | } |
---|
100 | finally { |
---|
101 | if (source != null) |
---|
102 | try { source.close(); } catch (IOException e) { ; } |
---|
103 | if (destination != null) |
---|
104 | try { destination.close(); } catch (IOException e) { ; } |
---|
105 | } |
---|
106 | } |
---|
107 | else if (src.isDirectory()) { |
---|
108 | String targetfile, target, targetdest; |
---|
109 | String[] files = src.list(); |
---|
110 | |
---|
111 | for (int i = 0; i < files.length; i++) { |
---|
112 | targetfile = files[i]; |
---|
113 | target = src + File.separator + targetfile; |
---|
114 | targetdest = dest + File.separator + targetfile; |
---|
115 | |
---|
116 | |
---|
117 | if ((new File(target)).isDirectory()) { |
---|
118 | copy(new File(target), new File(targetdest)); |
---|
119 | } |
---|
120 | else { |
---|
121 | |
---|
122 | try { |
---|
123 | source = new FileInputStream(target); |
---|
124 | destination = new FileOutputStream(targetdest); |
---|
125 | buffer = new byte[1024]; |
---|
126 | |
---|
127 | while(true) { |
---|
128 | bytes_read = source.read(buffer); |
---|
129 | if (bytes_read == -1) break; |
---|
130 | destination.write(buffer, 0, bytes_read); |
---|
131 | } |
---|
132 | } |
---|
133 | finally { |
---|
134 | if (source != null) |
---|
135 | try { source.close(); } catch (IOException e) { ; } |
---|
136 | if (destination != null) |
---|
137 | try { destination.close(); } catch (IOException e) { ; } |
---|
138 | } |
---|
139 | } |
---|
140 | } |
---|
141 | } |
---|
142 | } |
---|
143 | |
---|
144 | |
---|
145 | /** |
---|
146 | * File.getParent() can return null when the file is specified without |
---|
147 | * a directory or is in the root directory. This method handles those cases. |
---|
148 | * |
---|
149 | * @param f the target File to analyze |
---|
150 | * @return the parent directory as a File |
---|
151 | */ |
---|
152 | private static File parent(File f) { |
---|
153 | String dirname = f.getParent(); |
---|
154 | if (dirname == null) { |
---|
155 | if (f.isAbsolute()) return new File(File.separator); |
---|
156 | else return new File(System.getProperty("user.dir")); |
---|
157 | } |
---|
158 | return new File(dirname); |
---|
159 | } |
---|
160 | |
---|
161 | } |
---|