Zip decompression in Android

Zip decompression in Android

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;/*** Android Zip compression and decompression */public class Unzip {private static final int BUFF_SIZE = 1024*1024; // 1 M Byte/*** batch compressed file (folder) ** @ param resFileList file to be compressed (folder) list * @ param zipFile: the compressed file generated * @ throws IOException thrown when the compression process fails */public static void zipFiles (Collection
 
  
ResFileList, File zipFile) throws IOException {ZipOutputStream zipout = new ZipOutputStream (new BufferedOutputStream (new FileOutputStream (zipFile), BUFF_SIZE); for (File resFile: resFileList) {zipFile, zipout, "");} zipout. close ();}/*** batch compressed file (folder) ** @ param resFileList file to be compressed (folder) list * @ param zipFile generated compressed file * @ param comment comments of compressed file * @ throws IOException thrown when the compression process fails */public static void zipFiles (Collection
  
   
ResFileList, File zipFile, String comment) throws IOException {ZipOutputStream zipout = new ZipOutputStream (new BufferedOutputStream (new FileOutputStream (zipFile), BUFF_SIZE); for (File resFile: resFileList) {zipFile (resFile, zipout, "");} zipout. setComment (comment); zipout. close ();}/*** decompress a file ** @ param zipFile compressed file * @ param folderPath decompressed target directory * @ param isDelete * @ throws IOException when resolving When an error occurs during the compression process, */public static void upZipFile (File zipFile, String folderPath, boolean isDelete) {String strZipName = zipFile is thrown. getName (); folderPath + = "/" + strZipName. substring (0, strZipName. lastIndexOf (". "); File desDir = new File (folderPath); if (! DesDir. exists () {desDir. mkdirs ();} ZipFile zf; try {zf = new ZipFile (zipFile); for (Enumeration
   Entries = zf. entries (); entries. hasMoreElements ();) {ZipEntry entry = (ZipEntry) entries. nextElement (); if (entry. isDirectory () {String dirstr = entry. getName (); dirstr = new String (dirstr. getBytes ("8859_1"), "GB2312"); File f = new File (dirstr); f. mkdir (); continue;} InputStream in = zf. getInputStream (entry); String str = folderPath + File. separator + entry. getName (); str = new String (str. getByt Es ("8859_1"), "GB2312"); File desFile = new File (str); if (! DesFile. exists () {File fileParentDir = desFile. getParentFile (); if (! FileParentDir. exists () {fileParentDir. mkdirs ();} desFile. createNewFile ();} OutputStream out = new FileOutputStream (desFile); byte buffer [] = new byte [BUFF_SIZE]; int realLength; while (realLength = in. read (buffer)> 0) {out. write (buffer, 0, realLength);} in. close (); out. close () ;}if (isDelete) {zipFile. delete () ;}} catch (ZipException e) {e. printStackTrace ();} catch (IOException e) {e. printStackTrace ();}} /*** extract the file name containing the input text ** @ param zipFile compressed file * @ param folderPath destination folder * @ param nameContains imported file matching name * @ throws ZipException compression format * @ throws IOException IO thrown by mistake */public static ArrayList
   
    
UpZipSelectedFile (File zipFile, String folderPath, String nameContains) throws ZipException, IOException {ArrayList
    
     
FileList = new ArrayList
     
      
(); File desDir = new File (folderPath); if (! DesDir. exists () {desDir. mkdir ();} ZipFile zf = new ZipFile (zipFile); for (Enumeration
      Entries = zf. entries (); entries. hasMoreElements ();) {ZipEntry entry = (ZipEntry) entries. nextElement (); if (entry. getName (). contains (nameContains) {InputStream in = zf. getInputStream (entry); String str = folderPath + File. separator + entry. getName (); str = new String (str. getBytes ("8859_1"), "GB2312"); // str. getBytes ("GB2312"), "8859_1" output // str. getBytes ("8859_1"), "GB2312", input File desFile = new File (str); if (! DesFile. exists () {File fileParentDir = desFile. getParentFile (); if (! FileParentDir. exists () {fileParentDir. mkdirs ();} desFile. createNewFile ();} OutputStream out = new FileOutputStream (desFile); byte buffer [] = new byte [BUFF_SIZE]; int realLength; while (realLength = in. read (buffer)> 0) {out. write (buffer, 0, realLength);} in. close (); out. close (); fileList. add (desFile) ;}} return fileList ;} /*** get the file list in the compressed file ** @ param zipFile ZIP file * @ return the file name in the compressed file * @ throws ZipException: if the format of the compressed file is incorrect, throw * @ throws IOException when when an error occurs during decompression */public static ArrayList
      
        GetEntriesNames (File zipFile) throws ZipException, IOException {ArrayList
       
         EntryNames = new ArrayList
        
          (); Enumeration
         Entries = getEntriesEnumeration (zipFile); while (entries. hasMoreElements () {ZipEntry entry = (ZipEntry) entries. nextElement (); entryNames. add (new String (getEntryName (entry ). getBytes ("GB2312"), "8859_1");} return entryNames ;} /*** obtain the compressed file object in the compressed file to obtain its attributes ** @ param zipFile compressed file * @ return returns a compressed file list * @ throws ZipException thrown when the compressed file format is incorrect * @ throws IOException when the IO operation is incorrect */public static Enumeration
         GetEntriesEnumeration (File zipFile) throws ZipException, IOException {ZipFile zf = new ZipFile (zipFile); return zf. entries ();} /*** get the annotation of the compressed file object ** @ param entry compresses the file object * @ return the annotation of the compressed file object * @ throws UnsupportedEncodingException */public static String getEntryComment (ZipEntry entry) throws UnsupportedEncodingException {return new String (entry. getComment (). getBytes ("GB2312"), "8859_1");}/*** get Name of the compressed file object ** @ param entry: name of the compressed file object * @ return: name of the compressed file object * @ throws UnsupportedEncodingException */public static String getEntryName (ZipEntry entry) throws UnsupportedEncodingException {return new String (entry. getName (). getBytes ("GB2312"), "8859_1");}/*** compressed file ** @ param resFile the file to be compressed (folder) * @ param zipout: the target file to be compressed * @ param rootpath: the compressed file path * @ throws FileNotFoundException throws * @ throws IOExce Ption throws */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"), "GB2312"); if (resFile. isDirectory () {File [] fileList = resFile. listFiles (); for (File file: fileList) {zipFile (file, zipout, rootpath) ;}} else {byte buffer [] = new byte [BUFF_SIZE]; bufferedInputStream in = new BufferedInputStream (new FileInputStream (resFile), BUFF_SIZE); zipout. putNextEntry (new Zip Entry (rootpath); int realLength; while (realLength = in. read (buffer ))! =-1) {zipout. write (buffer, 0, realLength);} in. close (); zipout. flush (); zipout. closeEntry ();}}}