zip壓縮/解壓縮帶空資料夾的檔案

2011年07月21日 20:04:54 flex_work 閱讀數：7152 標籤： filestringbytebuffernullinclude 更多

個人分類： Flex And Java

       在EncryptZip的專案中對Zip的加密/解密沒有包含帶子資料夾的需求, 只有一層的關係. 

在此文中給出普通的zip壓縮/解壓縮的Java程式碼,  壓縮時遞迴壓縮檔案,包含檔案及檔案下的空資料夾. 若Flex端需要類似的功能, 可以參考本文中的zipFileWithTier 和unZipFileWithTier方法.

  程式碼如下:

1. public class ZipFileWithTier {

2.  

3. private static final String zipPath = "C:\\temp\\Lemur\\empty.zip";

4. private static final String unzipPath = "C:\\temp\\Lemur\\";

5. private static final String srcFiles = "C:\\temp\\Lemur\\empty";

6.  

7. @Test

8. public void zipFile(){

9. File file = new File(zipPath);

10. if(file.exists())

11. file.delete();

12. zipFileWithTier(srcFiles, zipPath);

13. }

14.  

15. @Test

16. public void upZipFile(){

17. try {

18. unzipFilesWithTier(readFileByte(zipPath), unzipPath + File.separator);

19. } catch (IOException e) {

20.  

21. e.printStackTrace();

22. }

23. }

24.  

25. /*

26. * Compress the specify file that contains sub-folders and store them to a zipfile.

27. * @param srcFiles: the file will be compressed

28. * @param zipPath: the location which stores the zipfile.

29. */

30. public static void zipFileWithTier(String srcFiles, String zipPath) {

31. try {

32.  

33. FileOutputStream zipFile = new FileOutputStream(zipPath);

34. BufferedOutputStream buffer = new BufferedOutputStream(zipFile);

35. ZipOutputStream out = new ZipOutputStream(buffer);

36. zipFiles(srcFiles, out, "");

37. out.close();

38. } catch (IOException e) {

39. // TODO Auto-generated catch block

40. e.printStackTrace();

41. }

42. }

43.  

44. /*

45. * Recursive the specify file also contains the folder which may don't include any file.

46. * @param filePath: compress file

47. * @param ZipOutputStream: the zipfile's outputStream.

48. * @param prefix: the prefix indicates the parent folder name of the file that makes the tier relation.

49. */

50. public static void zipFiles(String filePath, ZipOutputStream out, String prefix)

51. throws IOException {

52. File file = new File(filePath);

53. if (file.isDirectory()) {

54. if (file.listFiles().length == 0) {

55. ZipEntry zipEntry = new ZipEntry(prefix + file.getName() + "/");

56. out.putNextEntry(zipEntry);

57. out.closeEntry();

58. } else {

59. prefix += file.getName() + File.separator;

60. for (File f : file.listFiles())

61. zipFiles(f.getAbsolutePath(), out, prefix);

62. }

63. } else {

64. FileInputStream in = new FileInputStream(file);

65. ZipEntry zipEntry = new ZipEntry(prefix + file.getName());

66. out.putNextEntry(zipEntry);

67. byte[] buf = new byte[1024];

68. int len;

69. while ((len = in.read(buf)) > 0) {

70. out.write(buf, 0, len);

71. }

72. out.closeEntry();

73. in.close();

74. }

75.  

76. }

77.  

78. /*

79. * Unzip the file also contains the folder which the listFiles's length is 0.

80. * @param bytes: the content of the zipfile by byte array. *

81. * @param prefix: the prefix is the root of the store path.

82. * @IOExcetion: the ioexception during unzipFiles.

83. */

84. public static void unzipFilesWithTier(byte[] bytes, String prefix) throws IOException {

85.  

86. InputStream bais = new ByteArrayInputStream(bytes);

87. ZipInputStream zin = new ZipInputStream(bais);

88. ZipEntry ze;

89. while ((ze = zin.getNextEntry()) != null) {

90. if (ze.isDirectory()) {

91. File file = new File(prefix + ze.getName());

92. if (!file.exists())

93. file.mkdirs();

94. continue;

95. }

96. File file = new File(prefix + ze.getName());

97. if (!file.getParentFile().exists())

98. file.getParentFile().mkdirs();

99. ByteArrayOutputStream toScan = new ByteArrayOutputStream();

100. byte[] buf = new byte[1024];

101. int len;

102. while ((len = zin.read(buf)) > 0) {

103. toScan.write(buf, 0, len);

104. }

105. byte[] fileOut = toScan.toByteArray();

106. toScan.close();

107. writeByteFile(fileOut, new File(prefix + ze.getName()));

108. }

109. zin.close();

110. bais.close();

111. }

112.  

113. public static byte[] readFileByte(String filename) throws IOException {

114.  

115. if (filename == null || filename.equals("")) {

116. throw new NullPointerException("File is not exist!");

117. }

118. File file = new File(filename);

119. long len = file.length();

120. byte[] bytes = new byte[(int) len];

121.  

122. BufferedInputStream bufferedInputStream = new BufferedInputStream(

123. new FileInputStream(file));

124. int r = bufferedInputStream.read(bytes);

125. if (r != len)

126. throw new IOException("Read file failure!");

127. bufferedInputStream.close();

128.  

129. return bytes;

130.  

131. }

132.  

133. public static String writeByteFile(byte[] bytes, File file) {

134. FileOutputStream fos = null;

135. try {

136. fos = new FileOutputStream(file);

137. fos.write(bytes);

138. } catch (FileNotFoundException e) {

139. e.printStackTrace();

140.  

141. } catch (IOException e) {

142. e.printStackTrace();

143. } finally {

144. if (fos != null) {

145. try {

146. fos.close();

147. } catch (IOException e) {

148. e.printStackTrace();

149. }

150. }

151. }

152. return "success";

153. }

154.  
155.  
156.  

157. }

(轉貼請註明出處) 

Author:David

   Mail:[email protected]

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