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dilipkkp2412
Contributor

Overview:


Here we will see

  • Using SAP-PI UDF (Java), we consume SharePoint REST to write a File into SharePoint.

  • A business requirement, where employee’s pending item counts need to be updated in SharePoint in file format.

  • Employee's Pending Count will be fetched from one system's REST service and resulted string will be posted into a file format in SharePoint.

  • Fetching Employee's Pending Count via respective REST service will be handled in separate UDF-1 and its result will be supplied to this SharePoint UDF-2.

  • Here we focus on java coding of "SharePoint UDF-2"

  • To access SharePoint, we need to fetch AccessToken first which can be get by following link help:



 

JavaCode to Create a file in SharePoint:

  • Here we try to write a constant string into SharePoint in FileFormat

  • This constant string can be replaced by desired strings like employee's pendingCount data as described in Overview section

  • AccessToken required for SharePoint authentication which can be found from above mentioned link.


/*
Sharepoint REST details to create a file:
url: http://<siteUrl>/_api/web/GetFolderByServerRelativeUrl('/<FolderName>')/Files/add(url='<fileName>',overwrite=true)
method: POST
headers:
Authorization: "Bearer " + accessToken
body: "Contents of file"
*/

//Frame Sharepoint REST URL to create a File
String siteURL = "https://<host>/<siteURL_path>"; //here <siteURL_path> is '/teams/SPdev/AlertsCount'
String wsUrl = siteUrl + "/_api/web/GetFolderByServerRelativeUrl('Shared%20Documents')/Files/add(url='File1.txt',overwrite=true)";

//Data to be written in File
String request = "Create a File with raw string !!!";

//Create HttpURLConnection
URL url = new URL(wsUrl);
URLConnection connection = url.openConnection();
HttpURLConnection httpConn = (HttpURLConnection) connection;

//Set Header
httpConn.setDoOutput(true);
httpConn.setDoInput(true);
httpConn.setRequestMethod("POST");
httpConn.setRequestProperty("Authorization", "Bearer " + accessToken);

//Send Request
DataOutputStream wr = new DataOutputStream(httpConn.getOutputStream ());
wr.writeBytes(request);
wr.flush();
wr.close();

//Read the response.
String responseStr = "";
if (httpConn.getResponseCode() == 200) {
responseStr = "File has been written successfully. ResponseCode: "+ httpConn.getResponseCode();
}else{
responseStr += "Error while writing file, ResponseCode: " + httpConn.getResponseCode() + " " + httpConn.getResponseMessage();
}

//System.out.println(httpResponseStr); //Print response


 

Testing Status in SharePoint:





 

 

Blog updated on 24-Jul2018 with following contents:

Lets see how we can read files present in some specific folder in SharePoint.

Here, in following examples, we will read files from default folder 'Documents' which while accessing referred as 'Shared Documents'.

[1] JavaCode to retrieve all files of a folder from SharePoint:
/*
Sharepoint REST details to retrieve all of the files in a folder
url: http://site url/_api/web/GetFolderByServerRelativeUrl('/Folder Name')/Files
method: GET
headers:
Authorization: "Bearer " + accessToken
accept: "application/json;odata=verbose" or "application/atom+xml"
*/
try {
//Frame SharePoint siteURL
String siteURL = "https://<host>/<siteURL_path>";

//Frame SharePoint URL to retrieve all of the files in a folder
String wsUrl = siteURL + "/_api/web/GetFolderByServerRelativeUrl('Shared%20Documents')/Files";

//Create HttpURLConnection
URL url = new URL(wsUrl);
URLConnection connection = url.openConnection();
HttpURLConnection httpConn = (HttpURLConnection) connection;

//Set Header
httpConn.setRequestMethod("GET");
httpConn.setRequestProperty("Authorization", "Bearer " + accessToken);
httpConn.setRequestProperty("accept", "application/json;odata=verbose"); //To get response in JSON
//httpConn.setRequestProperty("accept", "application/atom+xml"); //To get response in XML

//Read the response
String httpResponseStr = "";
InputStreamReader isr = null;
if (httpConn.getResponseCode() == 200) {
isr = new InputStreamReader(httpConn.getInputStream());
} else {
isr = new InputStreamReader(httpConn.getErrorStream());
}
BufferedReader in = new BufferedReader(isr);
String strLine = "";
while ((strLine = in.readLine()) != null) {
httpResponseStr = httpResponseStr + strLine;
}
//System.out.println(httpResponseStr); //Print response
} catch (Exception e) {
//System.out.println("Error while reading file: " + e.getMessage());
}

 

[2] JavaCode to retrieve a specific file from SharePoint:
/*
Sharepoint REST details to retrieve a specific file
url: http://site url/_api/web/GetFolderByServerRelativeUrl('/Folder Name')/Files('file name')/$value
method: GET
headers:
Authorization: "Bearer " + accessToken
*/

try {
//Frame SharePoint siteURL
String siteURL = "https://<host>/<path>";

//Frame SharePoint URL to retrieve all of the files in a folder
String wsUrl = siteURL + "/_api/web/GetFolderByServerRelativeUrl('Shared%20Documents')/Files('XYZ.txt')/$value";

//Create HttpURLConnection
URL url = new URL(wsUrl);
URLConnection connection = url.openConnection();
HttpURLConnection httpConn = (HttpURLConnection) connection;

//Set Header
httpConn.setRequestMethod("GET");
httpConn.setRequestProperty("Authorization", "Bearer " + accessToken);

//Read the response
String httpResponseStr = "";
InputStreamReader isr = null;
if (httpConn.getResponseCode() == 200) {
isr = new InputStreamReader(httpConn.getInputStream());
} else {
isr = new InputStreamReader(httpConn.getErrorStream());
}
BufferedReader in = new BufferedReader(isr);
String strLine = "";
while ((strLine = in.readLine()) != null) {
httpResponseStr = httpResponseStr + strLine;
}
//System.out.println(httpResponseStr); //Print response
} catch (Exception e) {
//System.out.println("Error while reading file: " + e.getMessage());
}

 

[3] JavaCode to retrieve a specific file from SharePoint when you know file's URL:
/*
Sharepoint REST details to retrieve a file with its URL
url: http://site url/_api/web/GetFileByServerRelativeUrl('/Folder Name/file name')/$value
method: GET
headers:
Authorization: "Bearer " + accessToken
*/

try {
//Frame SharePoint siteURL
String siteURL = "https://<host>/<siteURL_path>";

//Frame SharePoint URL to retrieve all of the files in a folder
//URL-Type-1
String wsUrl = siteURL + "/_api/web/GetFileByServerRelativeUrl('/<siteURL_path>/Shared%20Documents/XYZ.txt')/$value";

//URL-Type-2
//String wsUrl = siteURL + "/_api/Web/GetFileByServerRelativePath(decodedurl='/<siteURL_path>/Shared%20Documents/XYZ.txt')/$value";

//Create HttpURLConnection
URL url = new URL(wsUrl);
URLConnection connection = url.openConnection();
HttpURLConnection httpConn = (HttpURLConnection) connection;

//Set Header
httpConn.setRequestMethod("GET");
httpConn.setRequestProperty("Authorization", "Bearer " + accessToken);

//Read the response
String httpResponseStr = "";
InputStreamReader isr = null;
if (httpConn.getResponseCode() == 200) {
isr = new InputStreamReader(httpConn.getInputStream());
} else {
isr = new InputStreamReader(httpConn.getErrorStream());
}
BufferedReader in = new BufferedReader(isr);
String strLine = "";
while ((strLine = in.readLine()) != null) {
httpResponseStr = httpResponseStr + strLine;
}
//System.out.println(httpResponseStr); //Print response
} catch (Exception e) {
//System.out.println("Error while reading file: " + e.getMessage());
}

 




<<<<< Parent blog reference…..  Integrate SharePoint using SAP PI
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