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How to create a zip file with java.util.zip package |
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java.util.zip package gives facilities for creating Zip files.
The example below creates a Zip file from a normal text file:
import java.io.*;
import java.util.zip.*;
class makeZipFile {
public static void main(String[] args) {
if (args.length != 2) {
System.out.println(
"Usage: java makeZipFile [files to be zipped] [filename after zip] ");
return;
}
try {
String filename = args[0];
String zipfilename = args[1];
makeZipFile list = new makeZipFile( );
list.doZip(filename,zipfilename);
} catch (Exception e) {
e.printStackTrace();
}
}
public void doZip(String filename,String zipfilename) {
try {
byte[] buf = new byte[1024];
FileInputStream fis = new FileInputStream(filename);
fis.read(buf,0,buf.length);
CRC32 crc = new CRC32();
ZipOutputStream s = new ZipOutputStream(
(OutputStream)new FileOutputStream(zipfilename));
s.setLevel(6);
ZipEntry entry = new ZipEntry(filename);
entry.setSize((long)buf.length);
crc.reset();
crc.update(buf);
entry.setCrc( crc.getValue());
s.putNextEntry(entry);
s.write(buf, 0, buf.length);
s.finish();
s.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
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