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一、字符串流
@PostMapping("returnStream") public void returnStream(HttpServletResponse response) throws IOException { String message = "我是一段等待已流形式返回的文字"; // 以流的形式返回 ServletOutputStream out = null; ByteArrayOutputStream baos = null; try { InputStream inStream = new ByteArrayInputStream(message.getBytes()); 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 { Objects.requireNonNull(baos).flush(); baos.close(); Objects.requireNonNull(out).flush(); out.close(); } }
二、文件流
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(); }