Question

我有一个PDF资源的URL，但它没有用它的文件名标识。请求如下所示：

<option *ngFor = "let paquete of paquetes">{{ paquete.nombre}} / {{ paquete.precio | currency}}</option>

响应是：

GET /api/docs/12345
Accept: application/pdf

当我使用Postman调用api时，它会提示使用默认文件名＆＃34; response＆＃34;保存文件。因此，文件保存为＆＃34; response.pdf＆＃34;。我需要使用RestTemplate客户端以编程方式执行此操作。我如何捕获响应，因此我可以提取文件名（如上面的响应，它是sample.pdf），我可以相应地保存文件而不是通用文件名，如＆＃34; response.pdf＆＃34; < / p>

Answer 1

    RestTemplate restTemplate = new RestTemplate();
    restTemplate.getMessageConverters().add(new ByteArrayHttpMessageConverter());

    HttpHeaders headers = new HttpHeaders();
    //headers.add("Authorization", "Bearer SOME_BEARER_TOKEN"); //if requires some token
    headers.setAccept(Arrays.asList(MediaType.APPLICATION_PDF));

    HttpEntity<String> entity = new HttpEntity<>(headers);

    try {
        ResponseEntity<Resource> response = restTemplate.exchange(
                "https://SOME_API.COM/api/docs/12345",
                HttpMethod.GET, entity, Resource.class);


        if (response.getStatusCode() == HttpStatus.OK) {
            String disposition =  response.getHeaders().get("Content-Disposition").get(0);
            String fileName = disposition.replaceFirst("(?i)^.*filename=\"?([^\"]+)\"?.*$", "$1");//get the filename from the Content-Disposition header
            fileName = URLDecoder.decode(fileName, String.valueOf(StandardCharsets.ISO_8859_1));

            //save to examine file
            File targetFile = new File("c:/temp/" + fileName);
            FileUtils.copyInputStreamToFile(response.getBody().getInputStream(), targetFile);
        }
    } catch (RestClientException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

Answer 2

使用spring boot可以通过以下方式获取文件名：

response.getHeaders().getContentDisposition().getFilename()

在以下情况下：

    public void retrieveFile() {
    RestTemplate restTemplate = new RestTemplate();
    HttpHeaders headers = new HttpHeaders();
    headers.setAccept(Arrays.asList(MediaType.APPLICATION_OCTET_STREAM));
    HttpEntity<String> entity = new HttpEntity<>(headers);


    ResponseEntity<byte[]> response = restTemplate.exchange(Url, HttpMethod.GET, entity, byte[].class, "1");

    if(response.getStatusCode().equals(HttpStatus.OK))
    {
        byte[] scenarioBytesFile = response.getBody();
        String fileName = response.getHeaders().getContentDisposition().getFilename();

        // Do Someting with your file and name 
    }
}

下载PDF文件并捕获文件名

2 个答案: