zip压缩/解压缩带空文件夹的文件

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本文提供了一段Java代码，用于实现ZIP文件的压缩与解压缩功能，特别强调了如何处理和保留文件结构中的空文件夹。通过递归方式，该方法能够完整地保存目录层级，确保在解压缩后文件夹结构得以还原。

zip压缩/解压缩带空文件夹的文件

2011年07月21日 20:04:54 flex_work 阅读数：7152 标签： file string byte buffer null include 更多

个人分类： Flex And Java

在EncryptZip的项目中对Zip的加密/解密没有包含带子文件夹的需求, 只有一层的关系.

在此文中给出普通的zip压缩/解压缩的Java代码, 压缩时递归压缩文件,包含文件及文件下的空文件夹. 若Flex端需要类似的功能, 可以参考本文中的zipFileWithTier 和unZipFileWithTier方法.

代码如下:

public class ZipFileWithTier {
private static final String zipPath = "C:\\temp\\Lemur\\empty.zip";
private static final String unzipPath = "C:\\temp\\Lemur\\";
private static final String srcFiles = "C:\\temp\\Lemur\\empty";
@Test
public void zipFile(){
File file = new File(zipPath);
if(file.exists())
file.delete();
zipFileWithTier(srcFiles, zipPath);
}
@Test
public void upZipFile(){
try {
unzipFilesWithTier(readFileByte(zipPath), unzipPath + File.separator);
} catch (IOException e) {
e.printStackTrace();
}
}
/*
* Compress the specify file that contains sub-folders and store them to a zipfile.
* @param srcFiles: the file will be compressed
* @param zipPath: the location which stores the zipfile.
*/
public static void zipFileWithTier(String srcFiles, String zipPath) {
try {
FileOutputStream zipFile = new FileOutputStream(zipPath);
BufferedOutputStream buffer = new BufferedOutputStream(zipFile);
ZipOutputStream out = new ZipOutputStream(buffer);
zipFiles(srcFiles, out, "");
out.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/*
* Recursive the specify file also contains the folder which may don't include any file.
* @param filePath: compress file
* @param ZipOutputStream: the zipfile's outputStream.
* @param prefix: the prefix indicates the parent folder name of the file that makes the tier relation.
*/
public static void zipFiles(String filePath, ZipOutputStream out, String prefix)
throws IOException {
File file = new File(filePath);
if (file.isDirectory()) {
if (file.listFiles().length == 0) {
ZipEntry zipEntry = new ZipEntry(prefix + file.getName() + "/");
out.putNextEntry(zipEntry);
out.closeEntry();
} else {
prefix += file.getName() + File.separator;
for (File f : file.listFiles())
zipFiles(f.getAbsolutePath(), out, prefix);
}
} else {
FileInputStream in = new FileInputStream(file);
ZipEntry zipEntry = new ZipEntry(prefix + file.getName());
out.putNextEntry(zipEntry);
byte[] buf = new byte[1024];
int len;
while ((len = in.read(buf)) > 0) {
out.write(buf, 0, len);
}
out.closeEntry();
in.close();
}
}
/*
* Unzip the file also contains the folder which the listFiles's length is 0.
* @param bytes: the content of the zipfile by byte array. *
* @param prefix: the prefix is the root of the store path.
* @IOExcetion: the ioexception during unzipFiles.
*/
public static void unzipFilesWithTier(byte[] bytes, String prefix) throws IOException {
InputStream bais = new ByteArrayInputStream(bytes);
ZipInputStream zin = new ZipInputStream(bais);
ZipEntry ze;
while ((ze = zin.getNextEntry()) != null) {
if (ze.isDirectory()) {
File file = new File(prefix + ze.getName());
if (!file.exists())
file.mkdirs();
continue;
}
File file = new File(prefix + ze.getName());
if (!file.getParentFile().exists())
file.getParentFile().mkdirs();
ByteArrayOutputStream toScan = new ByteArrayOutputStream();
byte[] buf = new byte[1024];
int len;
while ((len = zin.read(buf)) > 0) {
toScan.write(buf, 0, len);
}
byte[] fileOut = toScan.toByteArray();
toScan.close();
writeByteFile(fileOut, new File(prefix + ze.getName()));
}
zin.close();
bais.close();
}
public static byte[] readFileByte(String filename) throws IOException {
if (filename == null || filename.equals("")) {
throw new NullPointerException("File is not exist!");
}
File file = new File(filename);
long len = file.length();
byte[] bytes = new byte[(int) len];
BufferedInputStream bufferedInputStream = new BufferedInputStream(
new FileInputStream(file));
int r = bufferedInputStream.read(bytes);
if (r != len)
throw new IOException("Read file failure!");
bufferedInputStream.close();
return bytes;
}
public static String writeByteFile(byte[] bytes, File file) {
FileOutputStream fos = null;
try {
fos = new FileOutputStream(file);
fos.write(bytes);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (fos != null) {
try {
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return "success";
}
}