JAVA读取文本文件内容以流的形式返回到前端

此方法放Controller

		ServletOutputStream out = null;
		ByteArrayOutputStream baos = null;
		try {
			File file=new File(filename);
			InputStream inStream=new FileInputStream(file);
			byte[] buffer = new byte[1024];
			int len;
			baos = new ByteArrayOutputStream();
			while ((len = inStream.read(buffer)) != -1) {
				baos.write(buffer, 0, len);
			}
			out = response.getOutputStream();
			out.write(baos.toByteArray());
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			baos.flush();
			baos.close();
			out.flush();
			out.close();
		}