FileCopy xref

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FileCopy xref

1   /*
2    * Copyright 2000-2001,2004 The Apache Software Foundation.
3    * 
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    * 
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    * 
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  
17  package org.apache.jetspeed.util;
18  
19  import java.io.*;
20  import java.net.URL;
21  
22  /*
23   * File Copy Utilities. Some utilities that java.io doesn't give us.
24   *
25   *    copy() - copies one file source to another file destination.
26   *    copyFromURL)() - copies from a URL source to a file destination.
27   *
28   *  @author David S. Taylor <a href="mailto:taylor@apache.org">David Sean Taylor</a>
29   */
30  
31  public class FileCopy {
32  
33      public static final int BUFFER_SIZE = 4096;
34  
35      /*
36       *  Copies one file source to another file destination. 
37       *
38       * @param source The source file.
39       * @param destination The destination file.
40       * @throws IOException When an IO error occurs, this exception is thrown.
41       */
42      public static final void copy(String source, String destination)
43                  throws IOException
44      {
45          byte[] buffer = new byte[BUFFER_SIZE];    
46          BufferedInputStream input;
47          BufferedOutputStream output;
48  
49          input = new BufferedInputStream(new FileInputStream(source));
50          output = new BufferedOutputStream(new FileOutputStream(destination));
51  
52          copyStream(input, output, buffer);
53  
54          input.close();
55          output.close();
56      }
57  
58      /*
59       *  Copies from a URL source to a file destination.
60       *
61       * @param source The source URL.
62       * @param destination The destination file.
63       * @throws IOException When an IO error occurs, this exception is thrown.
64       */
65      public static final void copyFromURL(String source, String destination)
66                throws IOException
67      {
68          byte[] buffer = new byte[BUFFER_SIZE];    
69          URL url = new URL(source);
70            BufferedInputStream input;
71            BufferedOutputStream output;
72          
73          
74          input = new BufferedInputStream(new DataInputStream(url.openStream()));
75          output = new BufferedOutputStream(new FileOutputStream(destination));
76          
77          copyStream(input, output, buffer);
78          
79          input.close();
80          output.close();
81      }
82  
83      /*
84       *  Generic copy from a input stream to an output stream.
85       *
86       * @param input The source input stream.
87       * @param output The destination output stream.
88       * @param buffer The user provided buffer.
89       * @throws IOException When an IO error occurs, this exception is thrown.
90       */
91      public static final void copyStream(InputStream input,
92                                          OutputStream output,
93                                          byte[] buffer)
94                  throws IOException
95      {
96          int bytesRead;
97  
98          while((bytesRead = input.read(buffer)) != -1)
99              output.write(buffer, 0, bytesRead);
100     }
101 
102 }