使用ServletOutputStream将音频流输出到客户端、代码莫名其妙执行两次

[woshixiaoxiaoqi]

public void test(HttpServletResponse response) throws IOException {
		System.out.println("111");
		// 使用response获得字节输出
		ServletOutputStream out = response.getOutputStream();
		//OutputStream out = new FileOutputStream("D://111_copy.mp3");
		int i = 0;
 
		InputStream fis = new FileInputStream("D://111.mp3");
 
		
		byte[] buffer = new byte[fis.available()];
		/*while ((len = in.read(buffer)) > 0) {
			System.out.println("count:" + (i++) + "   len:" + len);
			out.write(buffer, 0, len);
		}*/
		fis.read(buffer);
		out.write(buffer);
 
		System.out.println("222");
		fis.close();
		System.out.println("333");
		out.close();
		System.out.println("444");
	}

运行结果：

代码跑了两次，很莫名其妙，有大神知道原因吗？