本地图片Base64编码及文件转流

• Z时代
• 2024-01-10
• 分类：综合

/**
 * 本地图片base64编码" title="图片base64编码">图片base64编码
 */
public static String base64Img(String path) {
  InputStream is = null;
  ByteArrayOutputStream outStream = null;
  try {
    is = new FileInputStream(path);
    outStream = new ByteArrayOutputStream();
    byte[] buffer = new byte[1024];
    int len = 0;
    while ((len = is.read(buffer)) != -1) {
      outStream.write(buffer, 0, len);
    }
    is.close();
  } catch (IOException e) {
    e.printStackTrace();
  }
  return new BASE64Encoder().encode(outStream.toByteArray())
      .replace("data/image/jpeg/base64/", "");
}
/** 
* 本地文件以流方式处理 
*/
public static void downloadByStream(HttpServletResponse response, HttpServletRequest request,
    String fileName, String filePath) {
  byte[] buffer = new byte[1024];
  FileInputStream fis = null;
  BufferedInputStream bis = null;
  try {
    /* 解决中文文件名称的问题 */
    File file = ResourceUtils.getFile(filePath);
    String filenameIso = encodeName(request, fileName);
    /* 设置文件名 */
    response.addHeader("Content-Disposition", "attachment;fileName=" + filenameIso);
    fis = new FileInputStream(file);
    bis = new BufferedInputStream(fis);
    OutputStream os = response.getOutputStream();
    int i = bis.read(buffer);
    while (i != -1) {
      os.write(buffer, 0, i);
      i = bis.read(buffer);
    }
  } catch (Exception e) {
    throw new AppException(ErrorCode.UNEXCEPTED, e.getMessage());
  } finally {
    /* 关闭流 */
    IOUtils.closeQuietly(bis);
    IOUtils.closeQuietly(fis);
  }
}

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