How to compress and decompress files in Android
- 2021-07-18 09:04:24
- OfStack
Needless to say, post java code directly to everyone. The specific code is as follows:
Java code
package com.maidong.utils;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipException;
import java.util.zip.ZipFile;
import java.util.zip.ZipOutputStream;
import org.apache.http.protocol.HTTP;
public class ZipUtils {
private static final int BUFF_SIZE = 1024 * 1024; // 1M Byte
/**
* Batch compressed files (folders)
*
* @param resFileList
* List of files (folders) to compress
* @param zipFile
* Generated compressed file
* @throws IOException
* Thrown when there is an error in the compression process
*/
public static void zipFiles(Collection<File> resFileList, File zipFile) throws IOException {
ZipOutputStream zipout = null;
try {
zipout = new ZipOutputStream(new BufferedOutputStream(new FileOutputStream(zipFile), BUFF_SIZE));
for (File resFile : resFileList) {
zipFile(resFile, zipout, "");
}
} finally {
if (zipout != null)
zipout.close();
}
}
/**
* Batch compressed files (folders)
*
* @param resFileList
* List of files (folders) to compress
* @param zipFile
* Generated compressed file
* @param comment
* Comments on compressed files
* @throws IOException
* Thrown when there is an error in the compression process
*/
public static void zipFiles(Collection<File> resFileList, File zipFile, String comment) throws IOException {
ZipOutputStream zipout = null;
try {
zipout = new ZipOutputStream(new BufferedOutputStream(new FileOutputStream(zipFile), BUFF_SIZE));
for (File resFile : resFileList) {
zipFile(resFile, zipout, "");
}
zipout.setComment(comment);
} finally {
if (zipout != null)
zipout.close();
}
}
/**
* Decompression 1 Files
*
* @param zipFile
* Zip file
* @param folderPath
* Extracted target directory
* @throws IOException
* Thrown when an error occurs in the decompression process
*/
public static void upZipFile(File zipFile, String folderPath) throws ZipException, IOException {
File desDir = new File(folderPath);
if (!desDir.exists()) {
desDir.mkdirs();
}
ZipFile zf = new ZipFile(zipFile);
InputStream in = null;
OutputStream out = null;
try {
for (Enumeration<?> entries = zf.entries(); entries.hasMoreElements();) {
ZipEntry entry = ((ZipEntry) entries.nextElement());
in = zf.getInputStream(entry);
String str = folderPath + File.separator + entry.getName();
str = new String(str.getBytes("8859_1"), HTTP.UTF_8);
File desFile = new File(str);
if (!desFile.exists()) {
File fileParentDir = desFile.getParentFile();
if (!fileParentDir.exists()) {
fileParentDir.mkdirs();
}
desFile.createNewFile();
}
out = new FileOutputStream(desFile);
byte buffer[] = new byte[BUFF_SIZE];
int realLength;
while ((realLength = in.read(buffer)) > 0) {
out.write(buffer, 0, realLength);
}
}
} finally {
if (in != null)
in.close();
if (out != null)
out.close();
}
}
/**
* Unzip a file whose name contains the incoming text
*
* @param zipFile
* Zip file
* @param folderPath
* Destination folder
* @param nameContains
* File matching name passed in
* @throws ZipException
* Thrown when the compression format is incorrect
* @throws IOException
* IO Thrown when an error occurs
*/
public static ArrayList<File> upZipSelectedFile(File zipFile, String folderPath, String nameContains) throws ZipException,
IOException {
ArrayList<File> fileList = new ArrayList<File>();
File desDir = new File(folderPath);
if (!desDir.exists()) {
desDir.mkdir();
}
ZipFile zf = new ZipFile(zipFile);
InputStream in = null;
OutputStream out = null;
try {
for (Enumeration<?> entries = zf.entries(); entries.hasMoreElements();) {
ZipEntry entry = ((ZipEntry) entries.nextElement());
if (entry.getName().contains(nameContains)) {
in = zf.getInputStream(entry);
String str = folderPath + File.separator + entry.getName();
str = new String(str.getBytes("8859_1"), HTTP.UTF_8);
// str.getBytes(AppConstans.UTF_8),"8859_1" Output
// str.getBytes("8859_1"),AppConstans.UTF_8 Input
File desFile = new File(str);
if (!desFile.exists()) {
File fileParentDir = desFile.getParentFile();
if (!fileParentDir.exists()) {
fileParentDir.mkdirs();
}
desFile.createNewFile();
}
out = new FileOutputStream(desFile);
byte buffer[] = new byte[BUFF_SIZE];
int realLength;
while ((realLength = in.read(buffer)) > 0) {
out.write(buffer, 0, realLength);
}
fileList.add(desFile);
}
}
} finally {
if (in != null)
in.close();
if (out != null)
out.close();
}
return fileList;
}
/**
* Get the list of files in the compressed file
*
* @param zipFile
* Zip file
* @return File name in compressed file
* @throws ZipException
* Thrown when the compressed file format is incorrect
* @throws IOException
* Thrown when an error occurs in the decompression process
*/
public static ArrayList<String> getEntriesNames(File zipFile) throws ZipException, IOException {
ArrayList<String> entryNames = new ArrayList<String>();
Enumeration<?> entries = getEntriesEnumeration(zipFile);
while (entries.hasMoreElements()) {
ZipEntry entry = ((ZipEntry) entries.nextElement());
entryNames.add(new String(getEntryName(entry).getBytes(HTTP.UTF_8), "8859_1"));
}
return entryNames;
}
/**
* Get the zip file object within the zip file to get its properties
*
* @param zipFile
* Zip file
* @return Return 1 List of compressed files
* @throws ZipException
* Thrown when the compressed file format is incorrect
* @throws IOException
* IO Thrown when the operation is incorrect
*/
public static Enumeration<?> getEntriesEnumeration(File zipFile) throws ZipException, IOException {
ZipFile zf = new ZipFile(zipFile);
return zf.entries();
}
/**
* Gets the comment for the zip file object
*
* @param entry
* Compressed file object
* @return Comments on zip file objects
* @throws UnsupportedEncodingException
*/
public static String getEntryComment(ZipEntry entry) throws UnsupportedEncodingException {
return new String(entry.getComment().getBytes(HTTP.UTF_8), "8859_1");
}
/**
* Gets the name of the zip file object
*
* @param entry
* Compressed file object
* @return The name of the zip file object
* @throws UnsupportedEncodingException
*/
public static String getEntryName(ZipEntry entry) throws UnsupportedEncodingException {
return new String(entry.getName().getBytes(HTTP.UTF_8), "8859_1");
}
/**
* Zip file
*
* @param resFile
* Files (folders) to be compressed
* @param zipout
* Compressed destination file
* @param rootpath
* Compressed file path
* @throws FileNotFoundException
* Thrown when the file cannot be found
* @throws IOException
* Thrown when there is an error in the compression process
*/
private static void zipFile(File resFile, ZipOutputStream zipout, String rootpath) throws FileNotFoundException, IOException {
rootpath = rootpath + (rootpath.trim().length() == 0 ? "" : File.separator) + resFile.getName();
rootpath = new String(rootpath.getBytes("8859_1"), HTTP.UTF_8);
BufferedInputStream in = null;
try {
if (resFile.isDirectory()) {
File[] fileList = resFile.listFiles();
for (File file : fileList) {
zipFile(file, zipout, rootpath);
}
} else {
byte buffer[] = new byte[BUFF_SIZE];
in = new BufferedInputStream(new FileInputStream(resFile), BUFF_SIZE);
zipout.putNextEntry(new ZipEntry(rootpath));
int realLength;
while ((realLength = in.read(buffer)) != -1) {
zipout.write(buffer, 0, realLength);
}
in.close();
zipout.flush();
zipout.closeEntry();
}
} finally {
if (in != null)
in.close();
// if (zipout != null);
// zipout.close();
}
}
}
This is the end of the code, about Android compression and decompression of the full content of the file to give you so much, I hope to help you!