(Java) SharePoint -- Update the Contents of a File (PUT)

Demonstrates how to update the contents of a SharePoint file.

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import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    //  This requires the Chilkat API to have been previously unlocked.
    //  See Global Unlock Sample for sample code.

    CkHttp http = new CkHttp();

    //  If SharePoint Windows classic authentication is used, then set the
    //  Login, Password, LoginDomain, and NtlmAuth properties.
    http.put_Login("SHAREPOINT_USERNAME");
    http.put_Password("SHAREPOINT_PASSWORD");
    http.put_LoginDomain("SHAREPOINT_NTLM_DOMAIN");
    http.put_NtlmAuth(true);

    //  The more common case is to use SharePoint Online authentication (via the SPOIDCRL cookie).
    //  If so, do not set Login, Password, LoginDomain, and NtlmAuth, and instead
    //  establish the cookie as shown at SharePoint Online Authentication

    //  Indicate that we want a JSON reply
    http.put_Accept("application/json;odata=verbose");

    //  Update /Documents/ChilkatTest/sample.docx with new content...
    CkHttpRequest req = new CkHttpRequest();
    req.put_HttpVerb("POST");
    req.put_Path("/_api/web/GetFileByServerRelativeUrl('/Documents/ChilkatTest/sample.docx')/$value");
    //  Give the location of the file to be uploaded.
    //  Note: The file is not loaded into memory at this point.  It is never fully loaded
    //  into memory.  Instead, the file data is streamed directly from the file when
    //  when the upload occurs.
    req.StreamBodyFromFile("qa_data/msword/sample.docx");

    //  We need to add a form digest value in the X-RequestDigest header field.
    //  See this example for details on
    //  how to get (and cache) a form digest value
    req.AddHeader("X-RequestDigest","SHAREPOINT_FORM_DIGEST");

    //  Also need to add this header..
    req.AddHeader("X-HTTP-Method","PUT");

    //  Upload..
    boolean bUseTls = true;
    CkHttpResponse resp = http.SynchronousRequest("SHAREPOINT_HTTPS_DOMAIN",443,bUseTls,req);
    if (http.get_LastMethodSuccess() != true) {
        System.out.println(http.lastErrorText());
        return;
        }

    //  A successful update will return a 204 status code with an empty body.
    //  A non-successful update will return a JSON response body..
    if (resp.get_StatusCode() != 204) {
        System.out.println("Response status code = " + resp.get_StatusCode());
        CkJsonObject json = new CkJsonObject();
        json.Load(resp.bodyStr());
        json.put_EmitCompact(false);
        System.out.println(json.emit());
        System.out.println("Failed");

        return;
        }

    System.out.println("Success.");
  }
}