Sample code for 30+ languages & platforms
Java

SharePoint -- Recycle File (Move File to Recycle Bin)

Moves the file to the Recycle Bin and returns the identifier of the new Recycle Bin item.

Chilkat Java Downloads

Java
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[])
  {
    boolean success = false;

    //  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

    CkHttpRequest req = new CkHttpRequest();
    req.put_HttpVerb("POST");
    req.put_Path("/_api/web/GetFileByServerRelativeUrl('/ChilkatDocLibrary/sample.docx')/recycle");

    //  We must 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");

    //  Send the request to move the file to the recycle bin.
    boolean bUseTls = true;
    CkHttpResponse resp = new CkHttpResponse();
    success = http.HttpSReq("SHAREPOINT_HTTPS_DOMAIN",443,bUseTls,req,resp);
    if (success == false) {
        System.out.println(http.lastErrorText());
        return;
        }

    CkXml xml = new CkXml();
    xml.LoadXml(resp.bodyStr());

    //  A successful response will return the 200 status code.
    if (resp.get_StatusCode() != 200) {
        System.out.println("Response status code = " + resp.get_StatusCode());
        System.out.println(xml.getXml());
        System.out.println("Failed");
        return;
        }

    //  Show the XML response.
    System.out.println(xml.getXml());

    //  The GUID (identifier) of the item in the recycle bin is just the content
    //  of the single-node XML that is returned:
    String guid = xml.content();
    System.out.println("GUID of recycle item = " + guid);

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

    //  A successful XML response looks like this:

    //  <?xml version="1.0" encoding="utf-8" ?>
    //  <d:Recycle xmlns:d="http://schemas.microsoft.com/ado/2007/08/dataservices"
    //   xmlns:m="http://schemas.microsoft.com/ado/2007/08/dataservices/metadata"
    //   xmlns:georss="http://www.georss.org/georss"
    //   xmlns:gml="http://www.opengis.net/gml"
    //   m:type="Edm.Guid">
    //      63b9924d-e9c1-4d7b-b1c2-e921ad85aa1c
    //  </d:Recycle>
  }
}