Java REST客户端接收和保存excel响应时出错（字节数组）

我让SpringREST服务以字节数组的形式返回excel文件（XLS），并且需要编写适当的客户端代码来接收此响应并保存该文件。无法获取字节数组响应，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:头签名无效；读取0x000506000100809，应为0xE11AB1A1E011CFD0-您的文件似乎不是有效的OLE2文档

我尝试了以下方法，但没有成功

在返回响应之前，通过将文件保存在服务中来验证该文件是否有效

尝试发送InputStream而不是字节数组

尝试使用ResponseEntity 等

服务端代码

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

            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();

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();
    }

---

非常感谢您的帮助。

找到问题并解决

服务器端代码

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

            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();

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();
    }

客户端代码

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

            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();

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();
    }

stringuri=//uri
RestTemplate RestTemplate=新RestTemplate（）；
//输入对象
ResponseEntity结果=restTemplate.postForEntity（uri，输入，字节[].class）；
如果（结果！=null&&result.getStatusCodeValue（）==200&&result.getBody（）！=null&&result.getBody（）.length>0）
{
ByteArrayInputStream inputStream=新建ByteArrayInputStream（result.getBody（））；
HSSF工作簿=新的HSSF工作簿（inputStream）；
FileOutputStream outputStream=新的FileOutputStream（“output\\download.xls”）；
workbook.write（outputStream）；
inputStream.close（）；
workbook.close（）；
outputStream.close（）；
}