A sample program of ZipOutputStream and ZipInputStream. This code is ported from Hishidama's Java Zip File Memo. See http://www.ne.jp/asahi/hishidama/home/tech/java/zip.html

zip.scala

import java.io._
import java.util.zip.ZipEntry
import java.util.zip.ZipOutputStream
import java.util.zip.ZipInputStream

def encode(zos: ZipOutputStream, files: Seq[File]) {
  for (f <- files) {
    if (f.isDirectory) {
      encode(zos, f.listFiles)
    } else {
      val ze = new ZipEntry(f.getPath.replace('\\','/'))
      zos.putNextEntry(ze)
      val is = new BufferedInputStream(new FileInputStream(f))
      val buf = new Array[Byte](1024)
      var len = is.read(buf)
      while (len >= 0) {
        zos.write(buf, 0 ,len)
        len = is.read(buf)
      }
      is.close
    }
  }
}

def zip(destPath: String, srcPath: String) {
  val destFile = new File(destPath)
  val srcFiles = Array(new File(srcPath))
  val zos = new ZipOutputStream(new FileOutputStream(destFile))

  try {
    encode(zos, srcFiles)
  }
  finally {
    zos.close
  }
}

def unzip(srcPath:String) {
  val zis = new ZipInputStream(new FileInputStream(srcPath))
  val buf = new Array[Byte](1024)
  var len = 0

  var ze = zis.getNextEntry
  while (ze != null) {
    if (ze.isDirectory) {
      var dir = new File(ze.getName)
      dir.mkdir
    }
    else {
      var file = new File(ze.getName)
      var os = new BufferedOutputStream(new FileOutputStream(file))
      try {
        len = zis.read(buf)
        while (len >= 0) {
          os.write(buf, 0, len)
          len = zis.read(buf)
        }
      }
      finally {
        os.close
      }
    }

    ze = zis.getNextEntry
  }

  zis.close
}