[转贴]Compress files using the Java ZIP API

http://www.java2s.com/Code/Java/File-Input-Output/CompressfilesusingtheJavaZIPAPI.htm

Compress files using the Java ZIP API

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.GZIPOutputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

public class Compress {
  public static void gzipFile(String from, String to) throws IOException {
  FileInputStream in = new FileInputStream(from);
  GZIPOutputStream out = new GZIPOutputStream(new FileOutputStream(to));
  byte[] buffer = new byte[4096];
  int bytesRead;
  while ((bytesRead = in.read(buffer)) != -1)
  out.write(buffer, 0, bytesRead);
  in.close();
  out.close();
  }

  /** Zip the contents of the directory, and save it in the zipfile */
  public static void zipDirectory(String dir, String zipfile)
  throws IOException, IllegalArgumentException {
  // Check that the directory is a directory, and get its contents
  File d = new File(dir);
  if (!d.isDirectory())
  throw new IllegalArgumentException("Not a directory: "
  + dir);
  String[] entries = d.list();
  byte[] buffer = new byte[4096]; // Create a buffer for copying
  int bytesRead;

  ZipOutputStream out = new ZipOutputStream(new FileOutputStream(zipfile));

  for (int i = 0; i < entries.length; i++) {
  File f = new File(d, entries[i]);
  if (f.isDirectory())
  continue;//Ignore directory
  FileInputStream in = new FileInputStream(f); // Stream to read file
  ZipEntry entry = new ZipEntry(f.getPath()); // Make a ZipEntry
  out.putNextEntry(entry); // Store entry
  while ((bytesRead = in.read(buffer)) != -1)
  out.write(buffer, 0, bytesRead);
  in.close(); 
  }
  out.close();
  }

  public static void main(String args[]) throws IOException {
  String from = ".";
  File f = new File(from);
  boolean directory = f.isDirectory(); // Is it a file or directory?

  Compress.zipDirectory(from, from + ".zip");
  Compress.gzipFile(from, from + ".gz");
  }
}