Recetas Código: Java

De Daniel Pecos

Funciones para comprimir/descomprimir cadenas con GZIP

public static byte[] compressString(String str) {
        byte[] compressedStr = null;
       
        if (str != null && str != "") {
                GZIPOutputStream gzos = null;
                try {
                        ByteArrayOutputStream baos = new ByteArrayOutputStream();
                        gzos = new GZIPOutputStream(baos);
                       
                        gzos.write(str.getBytes());
                        gzos.flush();
                        gzos.close();
                       
                        compressedStr = baos.toByteArray();
                } catch (IOException ioe) {
                        System.out.println("Error I/O en la compresion");
                        try {
                                gzos.close();
                        } catch (IOException io) {
                                System.out.println("Error I/O al cerrar el stream");
                        }
                }
        }
       
        return compressedStr;
}

public static String uncompressString(byte [] compressedStr) {
        String str = null;
       
        if (compressedStr != null && compressedStr.length > 0) {
                GZIPInputStream gzis = null;
                try {
                        ByteArrayInputStream bais = new ByteArrayInputStream(compressedStr);
                        gzis = new GZIPInputStream(bais);
                        ByteArrayOutputStream baos  = new ByteArrayOutputStream();
                       
                        byte[] buffer = new byte[1024];
                        int size = 0;
                        while ((size = gzis.read(buffer)) > 0) {
                                baos.write(buffer, 0, size);
                        }
                        gzis.close();
                       
                        baos.close();
                        str = new String (baos.toByteArray());
                } catch (IOException ioe) {
                        System.out.println("Error I/O en la descompresion");
                        try {
                                gzis.close();
                        } catch (IOException io) {
                                System.out.println("Error I/O al cerrar el stream");
                        }
                }
        }
       
        return str;
}