base64转图片

/**
 * 
 * @param base64Str
 * @param path
 * @return
 */
public static File base642File(String base64Str, String path) {
   if (!StringUtils.isNotBlank(base64Str)) {
      return null;
   }
   if (!StringUtils.isNotBlank(path)) {
      return null;
   }
   BASE64Decoder decoder = new BASE64Decoder();
   byte[] b = new byte[0];
   try {
      b = decoder.decodeBuffer(base64Str);
      for (int i = 0; i < b.length; ++i) {
         if (b[i] < 0) {
            b[i] += 256;
         }
      }
      OutputStream out = new FileOutputStream(path);
      out.write(b);
      out.flush();
      out.close();
      log.info("根据base64字符串 生成图片成功。");
      return new File(path);
   } catch (IOException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
   }

   return null;
}