|
1 package de.java2html.util;
2
3 import java.io.BufferedInputStream  ;
4 import java.io.BufferedOutputStream ;
5 import java.io.ByteArrayOutputStream ;
6 import java.io.File ;
7 import java.io.FileInputStream ;
8 import java.io.FileOutputStream ;
9 import java.io.IOException ;
10 import java.io.InputStream ;
11 import java.io.OutputStream ;
12 import java.io.Reader ;
13 import java.io.Writer ;
14
15
18 public class IoUtilities {
19 private IoUtilities() {
20 }
22
23 public static byte[] readBytes(InputStream inputStream) throws IOException {
24 ByteArrayOutputStream byteOut = new ByteArrayOutputStream ();
25 copyStream(inputStream, byteOut);
26 return byteOut.toByteArray();
27 }
28
29 public static void copyStream(InputStream in, OutputStream out) throws IOException {
30 byte[] buffer = new byte[4096];
31 while (true) {
32 int bytesRead = in.read(buffer);
33 if (bytesRead == -1) {
34 break;
35 }
36 out.write(buffer, 0, bytesRead);
37 }
38 }
39
40 public static void close(OutputStream outputStream) {
41 if (outputStream != null) {
42 try {
43 outputStream.close();
44 }
45 catch (IOException e) {
46 }
48 }
49 }
50
51 public static void close(InputStream inputStream) {
52 if (inputStream != null) {
53 try {
54 inputStream.close();
55 }
56 catch (IOException e) {
57 }
59 }
60 }
61
62 public static void close(Writer writer) {
63 if (writer != null) {
64 try {
65 writer.close();
66 }
67 catch (IOException e) {
68 }
70 }
71 }
72
73 public static void close(Reader reader) {
74 if (reader != null) {
75 try {
76 reader.close();
77 }
78 catch (IOException e) {
79 }
81 }
82 }
83
84 public static void copy(File sourceFile, File destinationFile) throws IOException {
85 if (!ensureFoldersExist(destinationFile.getParentFile())) {
86 throw new IOException ("Unable to create necessary output directory " + destinationFile.getParentFile());
88 }
89 BufferedInputStream bis = null;
90 BufferedOutputStream bos = null;
91 try {
92 bis = new BufferedInputStream (new FileInputStream (sourceFile));
93 bos = new BufferedOutputStream (new FileOutputStream (destinationFile));
94 copyStream(bis, bos);
95 }
96 finally {
97 close(bis);
98 close(bos);
99 }
100 }
101
102 public static boolean ensureFoldersExist(File folder) {
103 if (folder.exists()) {
104 return true;
105 }
106 return folder.mkdirs();
107 }
108
109 public static File exchangeFileExtension(File file, String newFileExtension) {
110 String fileName = file.getAbsolutePath();
111 int index = fileName.lastIndexOf('.');
112 if (index == -1) {
113 throw new IllegalStateException ("Unable to determine file extension from file name '" + fileName
115 + "'"); }
117 return new File (fileName.substring(0, index + 1) + newFileExtension);
118 }
119 } |
Popular Tags |
Java API By Example, From Geeks To Geeks.