Zip Decompression in Android

Tag:android    compression    zip    decompression    

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 decompression */public class Unzip {private static Final int buff_size = 1024 * 1024; 1M Byte/** * Bulk Compressed file (clip) * * @param resfilelist file to compress (clip) list * @param zipfile generated compressed file * @throws I Oexception thrown when the compression process is faulted */public static void Zipfiles (Collection<file> resfilelist, File zipfile) throws Ioexc                eption {Zipoutputstream zipout = new Zipoutputstream (New Bufferedoutputstream ( ZipFile), buff_size));        for (File resfile:resfilelist) {zipfile (resfile, ZipOut, "");    } zipout.close (); }/** * Bulk compressed file (clip) * * @param resfilelist files to be Compressed (clip) list * @param zipfile generated compressed file * @param Comment Compressed text Note * @throws IOException when the compression process is faulted */public static void Zipfiles (collection<file> resfilelist, File Z Ipfile, String comment) throws IOException {Zipoutputstream zipout = new Zipoutputstream (New Bufferedou        Tputstream (New FileOutputStream (ZipFile), buff_size));        for (File resfile:resfilelist) {zipfile (resfile, ZipOut, "");        } zipout.setcomment (comment);    Zipout.close (); /** * Unzip a file * * @param zipfile Compressed file * @param folderpath extracted target directory * @param isdelete * @thr         oWS IOException Thrown when the decompression process is faulted */public static void Upzipfile (File zipfile, String FolderPath, Boolean isdelete) { String Strzipname = ZipFIle.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.hasmoreelemen TS ();)            {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.getbytes ("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 ();} /** * Unzip the file name containing the incoming text files * * @param zipfile Compressed Files * @param folderpath destination folder * @param namecontains incoming  File Match name * @throws zipexception compression format thrown * @throws IOException IO Error when thrown * */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); 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 = n                EW 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 a list of files within a compressed file * * @param zipfile Compressed file * @return file name in compressed file * @throws zipexception Compressed file format is incorrect when thrown * @throws IOException Thrown when an error occurs during decompression process */public static arraylist<string> Getentriesnames (File zipfile) throw        S 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 ("GB2312"), "8859_1"));    } return entrynames; /** * Get compressed file inside compressed file object to get its properties * * @param zipfile Compressed file * @return return a list of compressed files * @throws zipexception compression Thrown when file format is incorrect * @throws ioexception IO operation is incorrect when thrown */public static enumeration<?> getentriesenumeration (file ZipF        Ile) throws Zipexception, IOException {zipfile ZF = new ZipFile (ZipFile);     return Zf.entries (); /** * Get comments on compressed file objects * * @param entry Compressed File object * @return Compressed file Object comments * @throws UNSUPPORTEDENCODINGEXCEP tion */public static String Getentrycomment (ZipEntry entry) throws Unsupportedencodingexception {return NE    W String (Entry.getcomment (). GetBytes ("GB2312"), "8859_1"); /** * Gets the name of the compressed file object * * @param entry Compressed File object * @return The name of the compressed file object * @throws unsupportedencodingexcep tion */public static STRing Getentryname (zipentry entry) throws Unsupportedencodingexception {return new String (Entry.getname (). GetBytes ("    GB2312 ")," 8859_1 ");  }/** * Compressed file * * @param resfile Required compressed file (clip) * @param zipout Compressed file * @param rootpath Compressed path * @throws FileNotFoundException * @throws Thrown when a file is not found IOException when the compression process is faulted */private static void ZipFile (file re SFile, Zipoutputstream zipout, String rootpath) throws FileNotFoundException, IOException {RootPath = R Ootpath + (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 ZipEntry (RootPath));            int reallength;            while ((Reallength = in.read (buffer))! =-1) {zipout.write (buffer, 0, reallength);            } in.close ();            Zipout.flush ();        Zipout.closeentry (); }    }}

Zip Decompression in Android