拷貝InputStream

    public void testIOCopy (CloseableHttpResponse response){ //流只能讀取一遍，以下方法可以實現流的復用
        try { HttpEntity entity = response.getEntity(); InputStream in = entity.getContent(); ByteArrayOutputStream out = new ByteArrayOutputStream(); byte[] buffer = new byte[1024]; int len; while ((len = in.read(buffer)) > -1 ) { out.write(buffer, 0, len); } out.flush(); out.close(); in.close(); response.close(); //獲取照片流
            byte[] byteArray = out.toByteArray(); InputStream inputStream1 = new ByteArrayInputStream(byteArray); InputStream inputStream2 = new ByteArrayInputStream(byteArray); } catch (Exception e) { // TODO: handle exception
 } }