Android的 - 一些解压缩文件有大小为0(空) [英] Android - some unzipped files have 0 size (are empty)
问题描述
我现在面临的一个问题,在Android的解压文件。这里是code片断:
i'm facing a problem with unzipping files in Android. Here is the code snippet:
public void unzip() {
try {
FileInputStream fin = new FileInputStream(_zipFile);
BufferedInputStream in = new BufferedInputStream(fin);
ZipInputStream zin = new ZipInputStream(in);
ZipEntry ze = null;
while ((ze = zin.getNextEntry()) != null) {
Log.v("Decompress", "Unzipping " + ze.getName());
if(ze.isDirectory()) {
_dirChecker(ze.getName());
} else {
FileOutputStream fout = new FileOutputStream(_location + ze.getName());
BufferedOutputStream out = new BufferedOutputStream(fout);
byte[] buffer = new byte[1024];
int length;
while ((length = zin.read(buffer,0,1024)) >= 0) {
out.write(buffer,0,length);
}
/* while ((length = zin.read(buffer))>0) {
out.write(buffer, 0, length);
}*/
/*for (int c = zin.read(); c != -1; c = zin.read()) {
fout.write(c);
}*/
zin.closeEntry();
fout.close();
}
}
zin.close();
} catch(Exception e) {
Log.e("Decompress", "unzip", e);
}
}
较小的文件(10KB比小)将解压缩像空 - 大小为0(HTML文件,JPG格式)。其他文件都OK。如果我使用同样的code,但没有缓冲区中的所有文件都OK - ofcourse,无需解压的缓冲区是出了问题,因为它运行太长。文件存储在真实设备的SD卡上。我已经尝试设置较小的缓冲区大小(甚至是新的字节[2])。在此先感谢...
Smaller files (smaller than 10kB) are unzipped like empty - size 0 (html files, .jpg). Other files are ok. If I use this same code, but without buffers all the files are ok - ofcourse, unzipping without buffers is out of the question since it runs too long. Files are stored on SD card on real device. I have already tried setting smaller buffer size ( even new byte[2]). Thanks in advance...
推荐答案
试试这个code代替,
Try this code instead,
public void doUnzip(String inputZipFile, String destinationDirectory)
throws IOException {
int BUFFER = 2048;
List zipFiles = new ArrayList();
File sourceZipFile = new File(inputZip);
File unzipDestinationDirectory = new File(destinationDirectory);
unzipDestinationDirectory.mkdir();
ZipFile zipFile;
// Open Zip file for reading
zipFile = new ZipFile(sourceZipFile, ZipFile.OPEN_READ);
// Create an enumeration of the entries in the zip file
Enumeration zipFileEntries = zipFile.entries();
// Process each entry
while (zipFileEntries.hasMoreElements()) {
// grab a zip file entry
ZipEntry entry = (ZipEntry) zipFileEntries.nextElement();
String currentEntry = entry.getName();
File destFile = new File(unzipDestinationDirectory, currentEntry);
// destFile = new File(unzipDestinationDirectory, destFile.getName());
if (currentEntry.endsWith(".zip")) {
zipFiles.add(destFile.getAbsolutePath());
}
// grab file's parent directory structure
File destinationParent = destFile.getParentFile();
// create the parent directory structure if needed
destinationParent.mkdirs();
try {
// extract file if not a directory
if (!entry.isDirectory()) {
BufferedInputStream is =
new BufferedInputStream(zipFile.getInputStream(entry));
int currentByte;
// establish buffer for writing file
byte data[] = new byte[BUFFER];
// write the current file to disk
FileOutputStream fos = new FileOutputStream(destFile);
BufferedOutputStream dest =
new BufferedOutputStream(fos, BUFFER);
// read and write until last byte is encountered
while ((currentByte = is.read(data, 0, BUFFER)) != -1) {
dest.write(data, 0, currentByte);
}
dest.flush();
dest.close();
is.close();
}
} catch (IOException ioe) {
ioe.printStackTrace();
}
}
zipFile.close();
for (Iterator iter = zipFiles.iterator(); iter.hasNext();) {
String zipName = (String)iter.next();
doUnzip(
zipName,
destinationDirectory +
File.separatorChar +
zipName.substring(0,zipName.lastIndexOf(".zip"))
);
}
}
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