Example usage for java.util.zip DeflaterOutputStream write

Introduction

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

Prototype

public void write(byte[] b, int off, int len) throws IOException 

Source Link

Document

Writes an array of bytes to the compressed output stream.

Usage

From source file:util.RequestUtil.java

/**
 * Generates an encoded and compressed String from the specified XML-formatted
 * String. The String is encoded in the following order:
 * <p>/*from   w w  w .j ava2s.  c  o m*/
 * 1. URL encode <br>
 * 2. Base64 encode <br>
 * 3. Deflate <br>
 * 
 * @param xmlString XML-formatted String that is to be encoded
 * @return String containing the encoded contents of the specified XML String
 */
public static String encodeMessage(String xmlString) throws IOException, UnsupportedEncodingException {
    // first DEFLATE compress the document (saml-bindings-2.0,
    // section 3.4.4.1)
    byte[] xmlBytes = xmlString.getBytes("UTF-8");
    ByteArrayOutputStream byteOutputStream = new ByteArrayOutputStream();
    DeflaterOutputStream deflaterOutputStream = new DeflaterOutputStream(byteOutputStream);
    deflaterOutputStream.write(xmlBytes, 0, xmlBytes.length);
    deflaterOutputStream.close();

    // next, base64 encode it
    Base64 base64Encoder = new Base64();
    byte[] base64EncodedByteArray = base64Encoder.encode(byteOutputStream.toByteArray());
    String base64EncodedMessage = new String(base64EncodedByteArray);

    // finally, URL encode it
    String urlEncodedMessage = URLEncoder.encode(base64EncodedMessage, "UTF-8");

    return urlEncodedMessage;
}

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