Example usage for java.util.zip GZIPInputStream GZIPInputStream

Introduction

In this page you can find the example usage for java.util.zip GZIPInputStream GZIPInputStream.

Prototype

public GZIPInputStream(InputStream in) throws IOException

Source Link

Document

Creates a new input stream with a default buffer size.

Usage

From source file:Main.java

protected static ByteArrayOutputStream inflate(final ByteArrayOutputStream pOutCompressed) throws IOException {
    final ByteArrayOutputStream uncompressed = new ByteArrayOutputStream(ONE_MB);
    final GZIPInputStream zin = new GZIPInputStream(new ByteArrayInputStream(pOutCompressed.toByteArray()));

    int read;//from ww  w  .ja va  2  s . com
    final byte[] buf = new byte[ONE_MB];
    while ((read = zin.read(buf)) != -1) {
        uncompressed.write(buf, 0, read);
    }

    return uncompressed;
}

From source file:Main.java

public static String decompress(String hexString) throws UnsupportedEncodingException {
    final byte[] byteArray = new byte[hexString.length() / 2];
    int k = 0;// w  w  w  .  jav  a2 s .co m
    for (int i = 0; i < byteArray.length; i++) {
        byte high = (byte) (Character.digit(hexString.charAt(k), 16) & 0xff);
        byte low = (byte) (Character.digit(hexString.charAt(k + 1), 16) & 0xff);
        byteArray[i] = (byte) (high << 4 | low);
        k += 2;
    }

    ByteArrayOutputStream out = new ByteArrayOutputStream();
    ByteArrayInputStream in = new ByteArrayInputStream(byteArray);

    try {
        GZIPInputStream gunzip = new GZIPInputStream(in);
        byte[] buffer = new byte[256];
        int n;
        while ((n = gunzip.read(buffer)) >= 0) {
            out.write(buffer, 0, n);
        }
    } catch (IOException e) {
        e.printStackTrace();
    }

    return out.toString();
}

From source file:Main.java

static String downloadHtml(String urlString) {
    StringBuffer buffer = new StringBuffer();

    try {/*from ww w .j  a  v a  2  s .  com*/
        URL url = new URL(urlString);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        HttpURLConnection.setFollowRedirects(true);
        conn.setRequestProperty("Accept-Encoding", "gzip, deflate");
        String encoding = conn.getContentEncoding();
        InputStream inStr = null;

        if (encoding != null && encoding.equalsIgnoreCase("gzip")) {
            inStr = new GZIPInputStream(conn.getInputStream());
        } else if (encoding != null && encoding.equalsIgnoreCase("deflate")) {
            inStr = new InflaterInputStream(conn.getInputStream(), new Inflater(true));
        } else {
            inStr = conn.getInputStream();
        }
        int ptr = 0;
        InputStreamReader inStrReader = new InputStreamReader(inStr, Charset.forName("GB2312"));

        while ((ptr = inStrReader.read()) != -1) {
            buffer.append((char) ptr);
        }
        inStrReader.close();
        conn.disconnect();
        inStr.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
    return buffer.toString();
}

From source file:Main.java

public static String gzipToString(final HttpEntity entity, final String defaultCharset)
        throws IOException, ParseException {
    if (entity == null) {
        throw new IllegalArgumentException("HTTP entity may not be null");
    }/* ww w  .  j  av  a2s.  c  o m*/
    InputStream instream = entity.getContent();
    if (instream == null) {
        return "";
    }
    // gzip logic start
    if (entity.getContentEncoding().getValue().contains("gzip")) {
        instream = new GZIPInputStream(instream);
    }
    // gzip logic end
    if (entity.getContentLength() > Integer.MAX_VALUE) {
        throw new IllegalArgumentException("HTTP entity too large to be buffered in memory");
    }
    int i = (int) entity.getContentLength();
    if (i < 0) {
        i = 4096;
    }
    String charset = EntityUtils.getContentCharSet(entity);
    if (charset == null) {
        charset = defaultCharset;
    }
    if (charset == null) {
        charset = HTTP.DEFAULT_CONTENT_CHARSET;
    }
    Reader reader = new InputStreamReader(instream, charset);
    CharArrayBuffer buffer = new CharArrayBuffer(i);
    try {
        char[] tmp = new char[1024];
        int l;
        while ((l = reader.read(tmp)) != -1) {
            buffer.append(tmp, 0, l);
        }
    } finally {
        reader.close();
    }
    return buffer.toString();
}

From source file:Main.java

public static String toString(final File file, final boolean gzip, final Charset charset) throws IOException {
    InputStream is = new FileInputStream(file);
    if (gzip)// w w w.  ja v  a2 s . com
        is = new GZIPInputStream(is);
    return toString(is, charset);
}

From source file:Main.java

public static void unzip(InputStream is, OutputStream os) {
    GZIPInputStream gzip = null;// w ww .  j  av a2 s. c  o  m
    try {
        gzip = new GZIPInputStream(is);
        byte[] buf = new byte[1024];
        int len;
        while ((len = gzip.read(buf)) != -1) {
            os.write(buf, 0, len);
        }
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        closeIO(gzip, os);
    }
}

From source file:Main.java

public static void unzip(InputStream is, OutputStream os) {
    GZIPInputStream gzip = null;/*from   w w  w  .jav a2  s  .  c om*/
    try {
        gzip = new GZIPInputStream(is);
        byte[] buf = new byte[1024];
        int len;
        while ((len = gzip.read(buf)) != -1) {
            os.write(buf, 0, len);
        }
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        closeIO(gzip);
        closeIO(os);
    }
}

From source file:Main.java

protected static String getResponseAsString(HttpURLConnection conn, boolean responseError) throws IOException {
    String charset = getResponseCharset(conn.getContentType());
    String header = conn.getHeaderField("Content-Encoding");
    boolean isGzip = false;
    if (header != null && header.toLowerCase().contains("gzip")) {
        isGzip = true;/*w w  w .  ja v a 2s. com*/
    }
    InputStream es = conn.getErrorStream();
    if (es == null) {
        InputStream input = conn.getInputStream();
        if (isGzip) {
            input = new GZIPInputStream(input);
        }
        return getStreamAsString(input, charset);
    } else {
        if (isGzip) {
            es = new GZIPInputStream(es);
        }
        String msg = getStreamAsString(es, charset);
        if (TextUtils.isEmpty(msg)) {
            throw new IOException(conn.getResponseCode() + ":" + conn.getResponseMessage());
        } else if (responseError) {
            return msg;
        } else {
            throw new IOException(msg);
        }
    }
}

From source file:ZipDemo.java

public static final String uncompress(final byte[] compressed) throws IOException {
    String uncompressed = "";

    try {/*w w  w  .  jav  a2s . c  o m*/
        ByteArrayInputStream bais = new ByteArrayInputStream(compressed);
        GZIPInputStream zis = new GZIPInputStream(bais);

        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        int numBytesRead = 0;
        byte[] tempBytes = new byte[DEFAULT_BUFFER_SIZE];
        while ((numBytesRead = zis.read(tempBytes, 0, tempBytes.length)) != -1) {
            baos.write(tempBytes, 0, numBytesRead);
        }

        uncompressed = new String(baos.toByteArray());
    } catch (ZipException e) {
        e.printStackTrace(System.err);
    }

    return uncompressed;
}

From source file:Util.java

public static Object decompress(byte[] data) {
    if (data == null) {
        return null;
    }//  www  .  j  a v a  2s .  co m
    try {
        ByteArrayInputStream bais = new ByteArrayInputStream(data);
        GZIPInputStream gin = new GZIPInputStream(bais);
        ObjectInputStream ois = new ObjectInputStream(gin);
        return ois.readObject();
    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;
}