File Operations. Simple compression and decompression

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. ArrayList;
Import java. util. Enumeration;
Import java. util. List;
Import java.util.zip. ZipEntry;
Import java.util.zip. ZipFile;
Import java.util.zip. ZipOutputStream;

Public class ziptofile {

Public static final string zip_filename = "C :\\ xjpda.zip"; // name of the file to be decompressed
Public static final string zip_dir = "C :\\ xjpda \"; // folder to be compressed
Public static final string un_zip_dir = "C :\\"; // directory of the file to be decompressed
Public static final int buffer = 1024; // cache size

/**
* Zip compression function.
* Compress all files in the basedir (Folder directory), including subdirectories.
* @ Throws exception
*/
Public static void zipfile (string basedir, string filename) throws exception {
List filelist = getsubfiles (new file (basedir ));
ZipOutputStream zos = new ZipOutputStream (new FileOutputStream (fileName ));
ZipEntry ze = null;
Byte [] buf = new byte [BUFFER];
Int readLen = 0;
For (int I = 0; I <fileList. size (); I ++ ){
File f = (File) fileList. get (I );
Ze = new ZipEntry (getAbsFileName (baseDir, f ));
Ze. setSize (f. length ());
Ze. setTime (f. lastModified ());
Zos. putNextEntry (ze );
InputStream is = new BufferedInputStream (new FileInputStream (f ));
While (readLen = is. read (buf, 0, BUFFER ))! =-1 ){
Zos. write (buf, 0, readLen );
}
Is. close ();
}
Zos. close ();
}

/**
* If the root directory is specified, the relative path of another file name is returned for the zip file.
* @ Param basedir java. Lang. String root directory
* @ Param realfilename actual file name of Java. Io. File
* @ Return relative file name
*/
Private Static string getabsfilename (string basedir, file realfilename ){
File real = realfilename;
File base = new file (basedir );
String ret = real. getname ();
While (true ){
Real = real. getparentfile ();
If (real = NULL)
Break;
If (Real. Equals (base ))
Break;
Else
Ret = real. getname () + "/" + ret;
}
Return ret;
}

/**
* Obtain the list of all objects in the specified directory, including subdirectories.
* @ Param basedir file specifies the Directory
* @ Return List containing java. io. File
*/
Private static List getSubFiles (File baseDir ){
List ret = new ArrayList ();
File [] tmp = baseDir. listFiles ();
For (int I = 0; I <tmp. length; I ++ ){
If (tmp [I]. isFile ())
Ret. add (tmp [I]);
If (tmp [I]. isDirectory ())
Ret. addAll (getSubFiles (tmp [I]);
}
Return ret;
}

/**
* Decompression function.
* Decompress the ZIP_FILENAME file to the ZIP_DIR directory.
* @ Throws Exception
*/
Public static void upZipFile () throws Exception {
ZipFile zfile = new ZipFile (ZIP_FILENAME );
Enumeration zList = zfile. entries ();
ZipEntry ze = null;
Byte [] buf = new byte [1, 1024];
While (zList. hasMoreElements ()){
Ze = (ZipEntry) zList. nextElement ();
If (ze. isDirectory ()){
File f = new File (ZIP_DIR + ze. getName ());
F. mkdir ();
Continue;
}
OutputStream OS = new BufferedOutputStream (new FileOutputStream (getRealFileName (ZIP_DIR, ze. getName ())));
InputStream is = new BufferedInputStream (zfile. getInputStream (ze ));
Int readLen = 0;
While (readLen = is. read (buf, 0, 1024 ))! =-1 ){
OS. write (buf, 0, readLen );
}
Is. close ();
OS. close ();
}
Zfile. close ();
}

/**
* If the root directory is specified, the actual file name corresponding to a relative path is returned.
* @ Param baseDir specify the root directory
* @ Param absFileName relative path name, from name in ZipEntry
* @ Return java. io. File actual File
*/
Public static File getRealFileName (String baseDir, String absFileName ){
String [] dirs = absFileName. split ("/");
File ret = new File (baseDir );
If (dirs. length> 1 ){
For (int I = 0; I <dirs. length-1; I ++ ){
Ret = new File (ret, dirs [I]);
}
If (! Ret. exists ())
Ret. mkdirs ();
Ret = new File (ret, dirs [dirs. length-1]);
Return ret;
}
Return ret;
}

}

However, there are Chinese problems above.
This is because the format conversion in java.util.zip is incorrect.
Set
Import java.util.zip. ZipEntry;
Import java.util.zip. ZipFile;
Import java.util.zip. ZipOutputStream;
Change
Import org.apache.tools.zip .*;
You can!
Apache corrected this phenomenon.