public ZipOutputStream(OutputStream out) 
{
                     
        super(out, new Deflater(Deflater.DEFAULT_COMPRESSION, true));
        usesDefaultDeflater = true;
}

Creates a new ZIP output stream.

Parameters:

out - the actual output stream

 public  void close() throws IOException 
{
        if (!closed) {
            super.close();
            closed = true;
        }
}

Closes the ZIP output stream as well as the stream being filtered.

 public  void closeEntry() throws IOException 
{
        ensureOpen();
        if (current != null) {
            ZipEntry e = current.entry;
            switch (e.method) {
            case DEFLATED:
                def.finish();
                while (!def.finished()) {
                    deflate();
                }
                if ((current.flag & 8) == 0) {
                    // verify size, compressed size, and crc-32 settings
                    if (e.size != def.getBytesRead()) {
                        throw new ZipException(
                            "invalid entry size (expected " + e.size +
                            " but got " + def.getBytesRead() + " bytes)");
                    }
                    if (e.csize != def.getBytesWritten()) {
                        throw new ZipException(
                            "invalid entry compressed size (expected " +
                            e.csize + " but got " + def.getBytesWritten() + " bytes)");
                    }
                    if (e.crc != crc.getValue()) {
                        throw new ZipException(
                            "invalid entry CRC-32 (expected 0x" +
                            Long.toHexString(e.crc) + " but got 0x" +
                            Long.toHexString(crc.getValue()) + ")");
                    }
                } else {
                    e.size  = def.getBytesRead();
                    e.csize = def.getBytesWritten();
                    e.crc = crc.getValue();
                    writeEXT(e);
                }
                def.reset();
                written += e.csize;
                break;
            case STORED:
                // we already know that both e.size and e.csize are the same
                if (e.size != written - locoff) {
                    throw new ZipException(
                        "invalid entry size (expected " + e.size +
                        " but got " + (written - locoff) + " bytes)");
                }
                if (e.crc != crc.getValue()) {
                    throw new ZipException(
                         "invalid entry crc-32 (expected 0x" +
                         Long.toHexString(e.crc) + " but got 0x" +
                         Long.toHexString(crc.getValue()) + ")");
                }
                break;
            default:
                throw new ZipException("invalid compression method");
            }
            crc.reset();
            current = null;
        }
}

Closes the current ZIP entry and positions the stream for writing the next entry.

 public  void finish() throws IOException 
{
        ensureOpen();
        if (finished) {
            return;
        }
        if (current != null) {
            closeEntry();
        }
        if (xentries.size() <  1) {
            throw new ZipException("ZIP file must have at least one entry");
        }
        // write central directory
        long off = written;
        for (XEntry xentry : xentries)
            writeCEN(xentry);
        writeEND(off, written - off);
        finished = true;
}

Finishes writing the contents of the ZIP output stream without closing the underlying stream. Use this method when applying multiple filters in succession to the same output stream.

 static int getUTF8Length(String s) 
{
        int count = 0;
        for (int i = 0; i <  s.length(); i++) {
            char ch = s.charAt(i);
            if (ch < = 0x7f) {
                count++;
            } else if (ch < = 0x7ff) {
                count += 2;
            } else {
                count += 3;
            }
        }
        return count;
}

 public  void putNextEntry(ZipEntry e) throws IOException 
{
        ensureOpen();
        if (current != null) {
            closeEntry();       // close previous entry
        }
        if (e.time == -1) {
            e.setTime(System.currentTimeMillis());
        }
        if (e.method == -1) {
            e.method = method;  // use default method
        }
        switch (e.method) {
        case DEFLATED:
            break;
        case STORED:
            // compressed size, uncompressed size, and crc-32 must all be
            // set for entries using STORED compression method
            if (e.size == -1) {
                e.size = e.csize;
            } else if (e.csize == -1) {
                e.csize = e.size;
            } else if (e.size != e.csize) {
                throw new ZipException(
                    "STORED entry where compressed != uncompressed size");
            }
            if (e.size == -1 || e.crc == -1) {
                throw new ZipException(
                    "STORED entry missing size, compressed size, or crc-32");
            }
            break;
        default:
            throw new ZipException("unsupported compression method");
        }
        if (! names.add(e.name)) {
            throw new ZipException("duplicate entry: " + e.name);
        }
        current = new XEntry(e, written);
        xentries.add(current);
        writeLOC(current);
}

Begins writing a new ZIP file entry and positions the stream to the start of the entry data. Closes the current entry if still active. The default compression method will be used if no compression method was specified for the entry, and the current time will be used if the entry has no set modification time.

 public  void setComment(String comment) 
{
        if (comment != null && comment.length()  > 0xffff/3
                                           && getUTF8Length(comment)  > 0xffff) {
            throw new IllegalArgumentException("ZIP file comment too long.");
        }
        this.comment = comment;
}

Sets the ZIP file comment.

 public  void setLevel(int level) 
{
        def.setLevel(level);
}

Sets the compression level for subsequent entries which are DEFLATED. The default setting is DEFAULT_COMPRESSION.

 public  void setMethod(int method) 
{
        if (method != DEFLATED && method != STORED) {
            throw new IllegalArgumentException("invalid compression method");
        }
        this.method = method;
}

Sets the default compression method for subsequent entries. This default will be used whenever the compression method is not specified for an individual ZIP file entry, and is initially set to DEFLATED.

 public synchronized  void write(byte[] b,
    int off,
    int len) throws IOException 
{
        ensureOpen();
        if (off <  0 || len <  0 || off  > b.length - len) {
            throw new IndexOutOfBoundsException();
        } else if (len == 0) {
            return;
        }
        if (current == null) {
            throw new ZipException("no current ZIP entry");
        }
        ZipEntry entry = current.entry;
        switch (entry.method) {
        case DEFLATED:
            super.write(b, off, len);
            break;
        case STORED:
            written += len;
            if (written - locoff  > entry.size) {
                throw new ZipException(
                    "attempt to write past end of STORED entry");
            }
            out.write(b, off, len);
            break;
        default:
            throw new ZipException("invalid compression method");
        }
        crc.update(b, off, len);
}

Writes an array of bytes to the current ZIP entry data. This method will block until all the bytes are written.