How do I upload a document to SharePoint with Java?

Question

I\'m creating some big files (DB exports) with Java and I need to put them somewhere on our SharePoint server. Right now, I\'m doing this with IE but I\'d like to automate t

Answer 1

I think my approach might help you.

Initially i have created sharepoint account and followed the procedure in this link (http://www.ktskumar.com/2017/01/access-sharepoint-online-using-postman/) to get needed credentials for REST API's. once i got the credentials all i needed was the following dependency and code:

        org.apache.httpcomponents
        httpclient
        4.5

Since i used OAUTH2 authentication, the code to get access token helps for other CRUD operations.

/* OAuth2 authentication to get access token */
public String getSharePointAccessToken() throws ClientProtocolException, IOException
{
    /* Initializing variables */
    String grant_type = RcConstants.GRANT_TYPE;
    String client_id = RcConstants.CLIENT_ID;
    String client_secret = RcConstants.CLIENT_SECRET;
    String resource = RcConstants.RESOURCE;
    String url = RcConstants.OAUTH_URL + RcConstants.URL_PARAMETER + "/tokens/OAuth/2";

    /*
     * NOTE: RcConstants.OAUTH_URL =
     * https://accounts.accesscontrol.windows.net/ RcConstants.URL_PARAMETER
     * = Bearer Realm from
     * (http://www.ktskumar.com/2017/01/access-sharepoint-online-using-
     * postman/) Figure 6.
     */

    /* Building URL */
    HttpClient client = HttpClientBuilder.create().build();
    HttpPost post = new HttpPost(url);
    post.setHeader("Content-Type", "application/x-www-form-urlencoded");

    /* Adding URL Parameters */
    List urlParameters = new ArrayList();
    urlParameters.add(new BasicNameValuePair("grant_type", grant_type));
    urlParameters.add(new BasicNameValuePair("client_id", client_id));
    urlParameters.add(new BasicNameValuePair("client_secret", client_secret));
    urlParameters.add(new BasicNameValuePair("resource", resource));
    post.setEntity(new UrlEncodedFormEntity(urlParameters));

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

    String json_string = EntityUtils.toString(response.getEntity());
    JSONObject temp1 = new JSONObject(json_string);  
    if (temp1 != null)
    {
        /* Returning access token */
        return temp1.get("access_token").toString();
    }
    return RcConstants.OAUTH_FAIL_MESSAGE;
}

Once we get access token we can upload using following method:

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;
        /*
         * NOTE: RcConstants.UPLOAD_FOLDER_URL =
         * https://.sharepoint.com/_api/web/
         * GetFolderByServerRelativeUrl('/Shared%20Documents/')/
         * Files/
         */

        /* 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;
}