this.url = savePath + "/" + this.fileName;
BASE64Decoder decoder = new BASE64Decoder();
try {
File outFile = new File(this.getPhysicalPath(this.url));
OutputStream ro = new FileOutputStream(outFile);
byte[] b = decoder.decodeBuffer(base64Data);
for (int i = 0; i < b.length; ++i) {
if (b[i] < 0) {
b[i] += 256;
}
}