使用 Java 客户端中的 REST API 将附件上传到 SharePoint 列表项

Question

以下 Java 代码是将文件附件上传到 SharePoint 2013 列表项的示例。

    String uploadquery =siteurl+ _api/web/Lists/GetByTitle('ListName')/items(1)/AttachmentFiles/add(FileName='File1.txt')";

    HttpPost httppost = new HttpPost(uploadquery);
    httppost.addHeader("Accept", "application/json;odata=verbose");
    httppost.addHeader("X-RequestDigest", FormDigestValue);
    httppost.addHeader("X-HTTP-Method", "PUT");
    httppost.addHeader("If-Match", "*");

    StringEntity se = new StringEntity("This is a Body");
    httppost.setEntity(se);
    HttpResponse response = httpClient.execute(httppost, localContext);

它使用内容创建文件。但它在响应中返回以下错误。

{"error":{"code":"-1, Microsoft.SharePoint.Client.InvalidClientQueryException","message":{"lang":"en-US","value":"The type SP.File does not support HTTP PATCH method."}}}

是什么导致了这个问题？

在上面的代码中，我上传了简单的文本内容。但是如何将其他文件类型如excel/ppt或图像上传到共享点列表项？

Answer 1

根据Working with folders and files with REST，必须指定以下属性才能为列表项创建文件附件：

• POST HTTP 请求方法
• X-RequestDigest 带有 FormDigest 值的标头
• HTTP 请求 body 和 content length

伪例子：

url: http://site url/_api/web/lists/getbytitle('list title')/items(item id)/AttachmentFiles/ add(FileName='file name')
method: POST
headers:
    Authorization: "Bearer " + accessToken
    body: "Contents of file."
    X-RequestDigest: form digest value
    content-length:length of post body 

C# 示例

以下 C# 示例演示如何使用 Network API 将创建文件附件上传到 SharePoint Online (SPO)：

var fileName = Path.GetFileName(uploadFilePath);
var requestUrl = string.Format("{0}/_api/web/Lists/GetByTitle('{1}')/items({2})/AttachmentFiles/add(FileName='{3}')", webUrl, listTitle, itemId,fileName);
var request = (HttpWebRequest)WebRequest.Create(requestUrl);
request.Credentials = credentials;  //SharePointOnlineCredentials object 
request.Headers.Add("X-FORMS_BASED_AUTH_ACCEPTED", "f");

request.Method = "POST";
request.Headers.Add("X-RequestDigest", requestDigest);

var fileContent = System.IO.File.ReadAllBytes(uploadFilePath);
request.ContentLength = fileContent.Length;
using (var requestStream = request.GetRequestStream())
{
    requestStream.Write(fileContent, 0, fileContent.Length);
}

var response = (HttpWebResponse)request.GetResponse();

我相信只要不费吹灰之力，它就可以转换成 Java 版本。

Answer 2

我使用了以下 URL 和下面的相关代码为我工作

https://[your_domain].sharepoint.com/_api/web/GetFolderByServerRelativeUrl('/Shared%20Documents/[FolderName]')/Files/Add(url='" + [文件名] + "',overwrite=true)

public String putRecordInSharePoint(File file) throws ClientProtocolException, IOException
{
    /* Token variable declaration */
    String token = getSharePointAccessToken();
    /* Null or fail check */
    if (!token.equalsIgnoreCase(RcConstants.OAUTH_FAIL_MESSAGE))
    {
        /* Upload path and file name declaration */
        String Url_parameter = "Add(url='" + file.getName() + "',overwrite=true)";
        String url = RcConstants.UPLOAD_FOLDER_URL + Url_parameter;


        /* Building URL */
        HttpClient client = HttpClientBuilder.create().build();
        HttpPost post = new HttpPost(url);
        post.setHeader("Authorization", "Bearer " + token);
        post.setHeader("accept", "application/json;odata=verbose");
        /* Declaring File Entity */
        post.setEntity(new FileEntity(file));

        /* Executing the post request */
        HttpResponse response = client.execute(post);
        logger.debug("Response Code : " + response.getStatusLine().getStatusCode());

        if (response.getStatusLine().getStatusCode() == HttpStatus.OK.value()
                || response.getStatusLine().getStatusCode() == HttpStatus.ACCEPTED.value())
        {
            /* Returning Success Message */
            return RcConstants.UPLOAD_SUCCESS_MESSAGE;
        }
        else
        {
            /* Returning Failure Message */
            return RcConstants.UPLOAD_FAIL_MESSAGE;
        }
    }
    return token;
}