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(Java) Xero Get Attachment (Download a Xero Attachment)

Demonstrates how to get the content of an attachment in Xero.

Note: This example requires Chilkat v9.5.0.64 or greater.

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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[])
  {
    // Note: Requires Chilkat v9.5.0.64 or greater.

    // This requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkRest rest = new CkRest();
    boolean success;

    // Before sending REST API calls, the REST object needs to be
    // initialized for OAuth1.
    // See Xero 2-Legged OAuth1 Setup for sample code.

    // Assuming the REST object's OAuth1 authenticator is setup, and the initial
    // connection was made, we may now send REST HTTP requests..

    // --------------------------------------------------------------
    // First get a list of attachments for a given document (in this case a Receipt).

    String endPoint = "Receipts";
    String receiptID = "c4f40e59-c390-0001-caff-ce731c707d00";

    CkStringBuilder sbPath = new CkStringBuilder();
    sbPath.Append("/api.xro/2.0/{Endpoint}/{Guid}/Attachments/");
    int numReplaced = sbPath.Replace("{Endpoint}",endPoint);
    numReplaced = sbPath.Replace("{Guid}",receiptID);

    String responseXml = rest.fullRequestNoBody("GET",sbPath.getAsString());
    if (rest.get_LastMethodSuccess() != true) {
        System.out.println(rest.lastErrorText());
        return;
        }

    // A 200 response is expected for actual success.
    if (rest.get_ResponseStatusCode() != 200) {
        System.out.println(responseXml);
        return;
        }

    // Examine the response.
    System.out.println(responseXml);

    // A sample response looks like this:

    // 	<Response xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    // 	  <Id>b235646f-34ac-4b15-90ce-d63267f7cd33</Id>
    // 	  <Status>OK</Status>
    // 	  <ProviderName>ChilkatPrivate</ProviderName>
    // 	  <DateTimeUTC>2016-11-11T14:32:17.0908971Z</DateTimeUTC>
    // 	  <Attachments>
    // 	    <Attachment>
    // 	      <AttachmentID>0edcddc8-325f-40c7-b950-8c71f14afc7c</AttachmentID>
    // 	      <FileName>penguins.jpg</FileName>
    // 	      <Url>http://api.xero.com/api.xro/2.0/Receipts/c4f40e59-c390-0001-caff-ce731c707d00/Attachments/penguins.jpg</Url>
    // 	      <MimeType>image/jpg</MimeType>
    // 	      <ContentLength>777835</ContentLength>
    // 	    </Attachment>
    // 	    <Attachment>
    // 	      <AttachmentID>0adffdc8-325f-65c7-b950-4391f14af908</AttachmentID>
    // 	      <FileName>starfish.jpg</FileName>
    // 	      <Url>http://api.xero.com/api.xro/2.0/Receipts/c4f40e59-c390-0001-caff-ce731c707d00/Attachments/starfish.jpg</Url>
    // 	      <MimeType>image/jpg</MimeType>
    // 	      <ContentLength>24537</ContentLength>
    // 	    </Attachment>
    // 	  </Attachments>
    // 	</Response>

    CkXml xml = new CkXml();
    xml.LoadXml(responseXml);

    // Iterate over the attachments and download each.
    int numRecords = xml.NumChildrenAt("Attachments");
    System.out.println("Number of Attachments = " + numRecords);

    CkStringBuilder sbSaveFilePath = new CkStringBuilder();
    CkStringBuilder sbAttachmentPath = new CkStringBuilder();
    CkBinData attachmentData = new CkBinData();
    int i = 0;
    while (i < numRecords) {
        xml.put_I(i);
        String attachmentID = xml.getChildContent("Attachments|Attachment[i]|AttachmentID");
        String filename = xml.getChildContent("Attachments|Attachment[i]|FileName");

        System.out.println("AttachmentID: " + attachmentID);
        System.out.println("Filename: " + filename);
        System.out.println("----");

        // Download this attachment.
        // First build the path for this particular attachment by appending the FileName to the path used to get the list of attachments.
        sbAttachmentPath.Clear();
        sbAttachmentPath.AppendSb(sbPath);
        sbAttachmentPath.Append(filename);

        // Send the GET request in one call, and then get the response in the next two.
        success = rest.SendReqNoBody("GET",sbAttachmentPath.getAsString());
        if (success != true) {
            System.out.println(rest.lastErrorText());
            return;
            }

        // Get the response header.  If it's not a 200 success status code, then the response body does NOT contain
        // the attachment data.
        int statusCode = rest.ReadResponseHeader();
        if (statusCode == -1) {
            // We didn't get any response..
            System.out.println(rest.lastErrorText());
            return;
            }

        if (statusCode != 200) {
            System.out.println("Response Status: " + statusCode);
            String responseBody = rest.readRespBodyString();
            if (rest.get_LastMethodSuccess() != true) {
                System.out.println("Failed to read the response body.");
                }
            else {
                System.out.println(responseBody);
                }

            System.out.println("Failed.");
            return;
            }

        // OK, the response header indicates the attachment content is forthcoming...
        // There are a few ways to get the response body. If it is a very large attachment, it can be streamed directly
        // to a file.  We'll assume it's not, so we'll get the response into a BinData object, and then save it to a file.
        attachmentData.Clear();
        success = rest.ReadRespBd(attachmentData);
        if (success != true) {
            System.out.println(rest.lastErrorText());
            return;
            }

        // Save the data to the file.
        sbSaveFilePath.SetString("qa_output/");
        sbSaveFilePath.Append(filename);
        success = attachmentData.WriteFile(sbSaveFilePath.getAsString());
        if (success != true) {
            System.out.println("Failed to save to output file.");
            }
        else {
            System.out.println("Saved to " + sbSaveFilePath.getAsString());
            }

        i = i+1;
        }
  }
}

 

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