java - Java REST 客户端接收和保存 excel 响应(字节数组)时出错

Question

我让 Spring REST 服务返回 excel 文件 (XLS) 作为字节数组，需要编写适当的客户端代码来接收此响应并保存文件。能够获得字节数组响应，但在将其转换为 excel 工作簿 (HSSFWorkbook) 时出现以下错误

org.apache.poi.poifs.filesystem.NotOLE2FileException: Invalid header signature; read 0x0005060000100809, expected 0xE11AB1A1E011CFD0 - Your file appears not to be a valid OLE2 document.

我尝试了以下但没有成功

1. 通过在返回响应之前将文件保存在服务中来验证该文件是否有效。
2. 试图发送 InputStream 而不是字节数组
3. 尝试使用 ResponseEntity 等等

服务端代码

HSSFWorkbook workbook = //code to generate the workbook
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
workbook.write(outputStream);
byte[] response = outputStream.toByteArray();

非常感谢任何帮助。

Answer 1

找到问题并修复它。

服务端代码

            HSSFWorkbook workbook = //workbook creation call
            ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
            workbook.write(outputStream);
            response = outputStream.toByteArray();
            headers = new HttpHeaders();
            headers.setAccessControlExposeHeaders(Collections.singletonList("Content-Disposition"));
            headers.set("Content-Disposition", "attachment; filename=download.xls");
            headers.setAccessControlExposeHeaders(Collections.singletonList("Content-Type"));
            headers.set("Content-Type","application/vnd.ms-excel");
            outputStream.close();

客户端代码

String uri = //URI
    RestTemplate restTemplate = new RestTemplate();
        //input object
    ResponseEntity<byte[]> result = restTemplate.postForEntity(uri, input, byte[].class);
    if(result!=null && result.getStatusCodeValue() == 200 && result.getBody()!=null && result.getBody().length>0)
    {
        ByteArrayInputStream inputStream = new ByteArrayInputStream(result.getBody());
        HSSFWorkbook workbook = new HSSFWorkbook(inputStream);
        FileOutputStream outputStream = new FileOutputStream("output\\download.xls");
        workbook.write(outputStream);
        inputStream.close();
        workbook.close();
        outputStream.close();
    }