如何使用RestTemplate发布Atom条目和文件

问题描述

我正在尝试使用RestTemplate发布具有多部分/相关请求的Atom xml和文件。 问题是-是否可以更改零件的标题，例如原子部分边界后显示的Content-Type或在文件部分中添加Content-ID，或者在这种情况下如何正确创建发布请求。 我的请求应如下所示：

POST /app/psw HTTP/1.1 
User-Agent: curl/7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 NSS/3.14.0.0 zlib/1.2.3 libidn/1.18 libssh2/1.4.2 
Host: localhost 
Accept: */* 
Authorization: Basic YWdzOmFnczEyMw== 
Content-Type: multipart/related;boundary===9B752C681081408==;type=application/atom+xml 
Content-Length: 7019 
Expect: 100-continue 

--==9B752C681081408== 
Content-Type: application/atom+xml 

<?xml version="1.0" encoding="utf-8"?>
<atom:entry ...>
...
</atom:entry>

--==9B752C681081408== 
Content-Type: video/mp2t 
Content-ID: <[e-mail]>

123f3242e34...binary data...12313ed
--==9B752C681081408==--

我必须使用RestTemplate或Spring WebClient。

现在看起来像下面所示，但是带有原子的部分具有Content-Type：application / xml而不是application / atom + xml

RestTemplate restTemplate = new RestTemplate();

restTemplate.getMessageConverters().stream()
        .filter(FormHttpMessageConverter.class::isinstance)
        .map(FormHttpMessageConverter.class::cast)
        .findFirst()
        .ifPresent(formHttpMessageConverter -> {
            List<MediaType> supportedMediaTypes = new ArrayList<>(formHttpMessageConverter.getSupportedMediaTypes());
            supportedMediaTypes.add(new MediaType("multipart","related"));
            formHttpMessageConverter.setSupportedMediaTypes(supportedMediaTypes);
        });

ResponseEntity<String> response;
LinkedMultiValueMap<String,Object> map = new LinkedMultiValueMap<>();
        
map.add("atom",e); //e is xml object created with javax.xml.bind package
map.add("file",new FileSystemResource(file));

HttpHeaders headers = new HttpHeaders();
headers.set("Content-Type","multipart/related;type=\"application/atom+xml\"");

httpentity<LinkedMultiValueMap<String,Object>> request = new httpentity<>(map,headers);

response = restTemplate.postForEntity(url,request,String.class);

提前谢谢

解决方法

好的，我找到了适合我的解决方案。我将尝试逐步解释我是如何做到的。

1. 准备RestTemplate

private RestTemplate prepareRestTemplate() {
    SimpleClientHttpRequestFactory requestFactory = new SimpleClientHttpRequestFactory();
    requestFactory.setBufferRequestBody(false);
    RestTemplate template = new RestTemplate(requestFactory);

    template.getMessageConverters().stream()
            .filter(FormHttpMessageConverter.class::isInstance)
            .map(FormHttpMessageConverter.class::cast)
            .findFirst()
            .ifPresent(formHttpMessageConverter -> {
                List<MediaType> supportedMediaTypes = new ArrayList<>(formHttpMessageConverter.getSupportedMediaTypes());
                supportedMediaTypes.add(new MediaType("multipart","related"));
                formHttpMessageConverter.setSupportedMediaTypes(supportedMediaTypes);
            });

    return template;
}

1. 创建标题

private HttpHeaders createHeaders() {
    HttpHeaders headers = new HttpHeaders();
    headers.set("Content-Type","multipart/related;type=\"application/atom+xml\"");
    headers.setBasicAuth(properties.getProperty("service.login"),properties.getProperty("service.password"));

    return headers;
}

1. 创建atom xml部件。

private HttpEntity<String> createAtomPart(String xml) {
    MultiValueMap<String,String> atomMap = new LinkedMultiValueMap<>();
    atomMap.add(HttpHeaders.CONTENT_TYPE,"application/atom+xml");

    return new HttpEntity<>(xml,atomMap);
}

1. 创建文件部分

private HttpEntity<InputStreamResource> createFilePart(InputStream file,String contentId,String contentType) {
    MultiValueMap<String,String> fileMap = new LinkedMultiValueMap<>();
    fileMap.add(HttpHeaders.CONTENT_TYPE,contentType);
    fileMap.add("Content-ID",contentId);

    return new HttpEntity<>(new InputStreamResource(file),fileMap);
}

1. 准备您的请求

private HttpEntity<MultiValueMap<String,Object>> prepareRequest(InputStream file,String xml,Object> bodyMap = new LinkedMultiValueMap<>();

    bodyMap.add("atom",createAtomPart(xml));
    bodyMap.add("file",createFilePart(file,contentId,contentType));

    return new HttpEntity<>(bodyMap,createHeaders());
}

1. 发布

public ResponseEntity<String> sendPostRequest(InputStream file,String contentType) throws ClientException {
    HttpEntity<MultiValueMap<String,Object>> request = prepareRequest(file,xml,contentType);
    ResponseEntity<String> response;

    try {
        response = restTemplate.postForEntity(uri,request,String.class);
    } catch (HttpServerErrorException e) {
        log.info("Error occurred on server side,reason:",e);
        return new ResponseEntity<>(e.getResponseBodyAsString(),e.getStatusCode());
    } catch (HttpClientErrorException e) {
        throw new ClientException(e.getStatusCode(),e.getResponseBodyAsString(),e);
    }

    return response;
}