我有一个被密码保护的zip压缩格式视频文件,保存在安卓模拟器的SD卡上。现在我想通过代码解压那个保存在SD卡上的视频文件。我该怎么做?需要帮助或者代码。 提前致谢。
我有一个被密码保护的zip压缩格式视频文件,保存在安卓模拟器的SD卡上。现在我想通过代码解压那个保存在SD卡上的视频文件。我该怎么做?需要帮助或者代码。 提前致谢。
import android.util.Log;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
/**
*
* @author jon
*/
public class Decompress {
private String _zipFile;
private String _location;
public Decompress(String zipFile, String location) {
_zipFile = zipFile;
_location = location;
_dirChecker("");
}
public void unzip() {
try {
FileInputStream fin = new FileInputStream(_zipFile);
ZipInputStream zin = new ZipInputStream(fin);
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());
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);
}
}
private void _dirChecker(String dir) {
File f = new File(_location + dir);
if(!f.isDirectory()) {
f.mkdirs();
}
}
}
在您的情况下:String zipFilename = Environment.getExternalStorageDirectory() + "/files.zip";
String unzipLocation = Environment.getExternalStorageDirectory() + "/unzipped/";
Decompress d = new Decompress(zipFilename, unzipLocation);
d.unzip();
byte[] buffer = new byte[4096]; for (int c = zin.read(buffer); c != -1; c = zin.read(buffer)) { fout.write(buffer, 0, c); }
- Rafael Nobre要解压受密码保护的文件,请使用此库:
http://www.lingala.net/zip4j/download.php
非常简单易操作。
ZipFile zipFile = new ZipFile(YourZipFile);
if(zipFile.isEncrypted())
zipFile.setPassword(Password);
zipFile.extractAll(Destination);
其他的答案并不能解决在KitKat及以上版本中对SD卡(Environment.getExternalStorageDirectory() != SDCARD)的访问问题。但是你可以使用以下代码来实现API 21及以上版本的访问!如果需要更多帮助以获取zipDocumentFile,请阅读这篇文章:
/**
* @return true->successful
*/
public static Boolean unzip(Context context, DocumentFile zipDocumentFile) {
try {
InputStream inputStream = context.getContentResolver().openInputStream(zipDocumentFile.getUri());
assert inputStream != null;
ZipInputStream zipInputStream = new ZipInputStream(new BufferedInputStream(inputStream, BUFFER_SIZE));
ZipEntry ze;
while ((ze = zipInputStream.getNextEntry()) != null) {
if (ze.isDirectory()) {
String[] paths = ze.getName().split("/");
DocumentFile documentFile = null;
for (String path : paths) {
if (documentFile == null) {
documentFile = zipDocumentFile.getParentFile().findFile(path);
if (documentFile == null)
documentFile = zipDocumentFile.getParentFile().createDirectory(path);
} else {
DocumentFile newDocumentFile = documentFile.findFile(path);
if (newDocumentFile == null) {
documentFile = documentFile.createDirectory(path);
} else {
documentFile = newDocumentFile;
}
}
}
if (documentFile == null || !documentFile.exists())
return false;
} else {
String[] paths = ze.getName().split("/");
//Make Folders
DocumentFile documentFile = null;
for (int i = 0; i < paths.length - 1; i++) {
if (documentFile == null) {
documentFile = zipDocumentFile.getParentFile().findFile(paths[i]);
if (documentFile == null)
documentFile = zipDocumentFile.getParentFile().createDirectory(paths[i]);
} else {
DocumentFile newDocumentFile = documentFile.findFile(paths[i]);
if (newDocumentFile == null) {
documentFile = documentFile.createDirectory(paths[i]);
} else {
documentFile = newDocumentFile;
}
}
}
DocumentFile unzipDocumentFile;
if (documentFile == null) {
unzipDocumentFile = zipDocumentFile.getParentFile().createFile(URLConnection.guessContentTypeFromName(ze.getName()), paths[paths.length - 1]);
} else {
unzipDocumentFile = documentFile.createFile(URLConnection.guessContentTypeFromName(ze.getName()), paths[paths.length - 1]);
}
// unzip the file
OutputStream outputStream = context.getContentResolver().openOutputStream(unzipDocumentFile.getUri());
int read;
byte[] data = new byte[BUFFER_SIZE];
assert outputStream != null;
while ((read = zipInputStream.read(data, 0, BUFFER_SIZE)) != -1)
outputStream.write(data, 0, read);
zipInputStream.closeEntry();
}
}
return true;
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
这是Samir代码的稍微更简洁的版本,使用Apache的IOUtils.copy()
来复制文件和finally
块。如果您在归档中有大文件,则最好使用IOUtils.copyLarge()
。
import org.apache.commons.io.IOUtils;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
public class ZipUtils {
public static void unzip(InputStream is, File path) {
checkDir(path);
ZipInputStream zis = null;
FileOutputStream fos = null;
try {
zis = new ZipInputStream(is);
ZipEntry ze;
while ((ze = zis.getNextEntry()) != null) {
File entryFile = new File(path, ze.getName());
if (ze.isDirectory()) {
checkDir(entryFile);
} else {
fos = new FileOutputStream(entryFile);
IOUtils.copy(zis, fos);
fos.close();
fos = null;
}
zis.closeEntry();
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if (zis != null) {
try {
zis.close();
} catch (IOException ignore) {
}
}
if (fos != null) {
try {
fos.close();
} catch (IOException ignore) {
}
}
}
}
private static void checkDir(File path) {
if (!path.exists()) {
path.mkdirs();
} else if (!path.isDirectory()) {
throw new IllegalArgumentException("Path is not directory");
}
}
}