记录一下springboot利用excel4j在服务器发布上生产文件之后，以流的形式传给前端_springboot workbook转为流

FileOutputStream temp = new FileOutputStream(new File(“C1.xlsx”));

    // List<NoTemplateSheetWrapper> sheets = new ArrayList<>();

    try {
		//前面生成xlsx的就不写了，太简单了，重点记录一下这里（发布到服务器上也可以用）
        ExcelUtils.getInstance().noTemplateSheet2Excel(sheets, temp);
    } catch (Excel4JException e) {
        e.printStackTrace();
    }
  //  ByteArrayOutputStream   baos=new   ByteArrayOutputStream();
 //   baos=(ByteArrayOutputStream) temp;
  //  ByteArrayInputStream swapStream = new ByteArrayInputStream(baos.toByteArray());


    System.out.println("上面那个的长的"+temp.toString().indexOf(2,9));

    ByteArrayOutputStream out = null;
    File file = new File("C1.xlsx");
    try {
        FileInputStream in = new FileInputStream(file);
        out = new ByteArrayOutputStream();
        byte[] b = new byte[1024];
        int i = 0;
        while ((i = in.read(b)) != -1) {

            out.write(b, 0, b.length);
        }
        out.close();
        in.close();
    } catch (FileNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    System.out.println("下面的Arr"+out.size());

    HttpHeaders httpHeaders = new HttpHeaders();
    String fileName = new String("C1.xlsx".getBytes("UTF-8"), "iso-8859-1");
    httpHeaders.setContentDispositionFormData("attachment", fileName);
    httpHeaders.setContentType(MediaType.APPLICATION_OCTET_STREAM);
    ResponseEntity<byte[]> filebyte = new ResponseEntity<>(out.toByteArray(), httpHeaders, HttpStatus.CREATED);

    return filebyte;
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