JS实现文件下载

HTML5的download属性

<a href="具体url(后端将文件以流形式返回)" rel="external nofollow" rel="external nofollow" rel="external nofollow" download="测试.xlsx（文件类型）" >下载</a>

效果如下图所示：

后端代码：

public static void writeFile(HttpServletResponse resp, InputStream inputStream) {
		OutputStream out = null;
		try {
			out = resp.getOutputStream();
			int len = 0;
			byte[] b = new byte[1024];
			while ((len = inputStream.read(b)) != -1) {
				out.write(b, 0, len);
			}
			out.flush();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			try {
				if (out != null) {
					out.close();
				}
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}