Java Function Code 7 -- Java creates zip and jar files

7. Create zip and jar files in Java

If (ARGs. length <2) {<br/> system. err. println ("Usage: Java zipit zip.zip file1 file2 file3"); <br/> system. exit (-1); <br/>}< br/> file zipfile = new file (ARGs [0]); <br/> If (zipfile. exists () {<br/> system. err. println ("zip file already exists, please try another"); <br/> system. exit (-2); <br/>}< br/> fileoutputstream Fos = new fileoutputstream (zipfile); <br/> zipoutputstream ZOS = new zipoutputstream (fo S); <br/> int bytesread; <br/> byte [] buffer = new byte [1024]; <br/> CRC32 CRC = new CRC32 (); <br/> for (INT I = 1, n = args. length; I <n; I ++) {<br/> string name = ARGs [I]; <br/> file = new file (name ); <br/> If (! File. exists () {<br/> system. err. println ("Skipping:" + name); <br/> continue; <br/>}< br/> bufferedinputstream Bis = new bufferedinputstream (<br/> New fileinputstream (File); <br/> CRC. reset (); <br/> while (bytesread = bis. read (buffer ))! =-1) {<br/> CRC. update (buffer, 0, bytesread); <br/>}< br/> bis. close (); <br/> // reset to beginning of input stream <br/> Bis = new bufferedinputstream (New fileinputstream (File )); <br/> zipentry entry = new zipentry (name); <br/> entry. setmethod (zipentry. stored); <br/> entry. setcompressedsize (file. length (); <br/> entry. setsize (file. length (); <br/> entry. setcrc (CRC. getvalue (); <br/> ZOS. putnextentry (Entry ); <Br/> while (bytesread = bis. Read (buffer ))! =-1) {<br/> ZOS. write (buffer, 0, bytesread); <br/>}< br/> bis. close (); <br/>}< br/> ZOS. close ();