Java decompression file Simple instance

package com.cwqi.demo;/** * @author  cwqi *2015-8-26 Morning 9:59:12 */import  java.io.bufferedinputstream;import java.io.bufferedoutputstream;import java.io.file;import  java.io.fileinputstream;import java.io.fileoutputstream;import java.io.ioexception;import  java.io.inputstream;import java.io.outputstream;import java.util.enumeration;import  org.apache.tools.ant.project;import org.apache.tools.ant.taskdefs.zip;import  org.apache.tools.ant.types.fileset;import org.apache.tools.zip.zipentry;import  Org.apache.tools.zip.zipfile;import org.apache.tools.zip.zipoutputstream;public class zipdemo  {/** *  decompression  *  @param  zipfilepath: Compressed file path  */public static void  Unzip (String zipfilepath)  {unzipfile (zipfilepath, null);} Public static file buildfile (string filename, boolean isdirectory)  {File  target = new file (FileName);if  (isdirectory)  {target.mkdirs ();  else {if  (!target.getparentfile (). exists ())  {target.getparentfile (). Mkdirs ();} Return target;} /** *  Unzip  *  @param  zipfilepath zip file path  *  @param  targetPath    Unzip to the location, if null or an empty string then the default decompression to the same directory as the ZIP package with the same name as the ZIP package under the folder  */public static void unzipfile ( String zipfilepath, string targetpath)  {outputstream os = null;inputstream  is = null; Zipfile zipfile = null;try {zipfile = new zipfile (ZipFilePath); string directorypath =  "";if  (null == targetpath | |   ". Equals (TargetPath))  {directorypath = zipfilepath.substring (0,zipfilepath.lastindexof (" ."));}  else {directorypath = targetpath;} @SuppressWarnings ("unchecked") Enumeration<zipentry> entryenum = zipfile.getentriES ();if  (null != entryenum)  {ZipEntry zipEntry = null;while  ( Entryenum.hasmoreelements ())  {zipentry = entryenum.nextelement ();if  (ZipEntry.isDirectory ( ))  {new file (Directorypath + file.separator+ zipentry.getname ()). Mkdirs (); continue;} if  (Zipentry.getsize ()  > 0)  {//  file file targetfile =  Zipdemo.buildfile (Directorypath+ file.separator + zipentry.getname (),  false); os =  new bufferedoutputstream (New fileoutputstream (targetfile));is =  Zipfile.getinputstream (zipentry); byte[] buffer = new byte[4096];int readlen =  0;while  ((Readlen = is.read (buffer, 0, 4096))  >= 0)  {os.write (Buffer, 0, readlen);} Os.flush (); Os.close ();}  else {//  Empty Directory Zipdemo.buildfile (Directorypath + file.separator+ zipentry.getname ( ), &nbsp, true);}}}  catch  (Ioexception ex)  {ex.printstacktrace ();}  finally {if  (Null != zipfile)  {zipfile = null;} if  (Null != is)  {try {is.close ();}  catch  (ioexception e)  {e.printstacktrace ();}} if  (Null != os)  {try {os.close ();}  catch  (ioexception e)  {e.printstacktrace ();}}} static final int buffer = 2048;/** *  compression  *  @param  sourcefile   The file or file directory to compress  *  @param  targetFile  the path and file name for the zip file to be generated, such as "D:\\downloads.zip"  */ Public static void zipfiles (String sourcedir, string targetfile)  {File  sourcefile = new file (SourceDir); File zfile = new file (targetfile); zipoutputstream zos = null;try {outputstream os;os = new  FileOutputStream (Zfile); bufferedoutputstream bos  = new bufferedoutputstream (OS); Zos = new zipoutputstream (BOS); string basepath = null;if  (Sourcefile.isdirectory ())  {basePath =  Sourcefile.getpath ();}  else {basepath = sourcefile.getparent ();} ZipFile (Sourcefile, basepath, zos);}  catch  (ioexception e)  {e.printstacktrace ();}  finally {if  (Zos != null)  {try {zos.close ();}  catch  (ioexception e)  {e.printstacktrace ();}}} Private static void zipfile (File sourcefile, string basepath,zipoutputstream  zos)  throws IOException {File[] files = null;if  ( Sourcefile.isdirectory ())  {files = sourcefile.listfiles ();}  else {files = new file[] { sourcefile };} inputstream is = null; bufferedinputstream bis = null; string pathname;byte[] buf = new byte[buffer];int length = 0;try {for  (File file :  files)  {if  (File.isdirectory ())  {pathname = file.getpath (). SUBSTRING ( Basepath.length ()  + 1) +  "/"; Zos.putnextentry (New zipentry (PathName)); ZipFile (file,  Basepath, zos);}  else {pathname = file.getpath (). substring (basepath.length ()  + 1); is =  new fileinputstream (file); Bis = new bufferedinputstream (is); Zos.putnextentry (new  zipentry (PathName));while  ((Length = bis.read (BUF))  != -1)  {zos.write (buf,  0, length);}}}  finally {if  (Bis != null)  {bis.close ();} if  (Is != null)  {is.close ();}} /** *  using ant compression  *  @param  srcPathName *  @param  destPathName */  Public static void zipbyant (string srcpathname,string destPathName)  {file srcdir = new file (srcpathname);if  (!srcdir.exists ()) {throw  New runtimeexception (srcpathname +  "no exist!");} Project project = new project (); Zip zip = new zip (); Zip.setproject (project); File zipfile = new file (Destpathname); Zip.setdestfile (ZipFile); Fileset fileset = new fileset (); Fileset.setproject (project); Fileset.setdir (srcdir);//  fileset.setincludes ("**/*.java");// fileset.setexcludes (*.txt);  zip.addfileset (FileSet); Zip.execute ();} /** *  Test  *  @param  args */public static void main (string[]  args)  {unzipfile ("D:\\downloads.zip",  "d:\\downloads");//zipfiles ("D:\\downloads",  "D:\\ Downloads.zip ");//zipbyant (" D:\\downloads ", " D:\\downloads.zip ");}}

Java decompression file Simple instance