Java

Get a MIME Header Field Attribute

Demonstrates the Chilkat Mime.GetHeaderFieldAttribute method, which returns an attribute value parsed from a header field. The first argument is the header field name and the second is the attribute name. Surrounding quotes are removed.

Note: The file path is relative to the application's current working directory. Absolute paths may also be used. Supply the path to your own file.

Background: Many MIME headers pack extra parameters after the main value — Content-Type: multipart/mixed; boundary="xyz" or Content-Disposition: attachment; filename="report.pdf". This method extracts one of those named attributes directly, saving you from parsing the header string yourself and correctly stripping quotes and handling encoded values.

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Chilkat2 Java

import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.Mime;

public class ChilkatExample {

    public static void main(String[] args) {
        Mime mime = new Mime();
        try {
            mime.loadMimeFile("qa_data/message.eml");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Return an attribute value parsed from a header field.  The 1st argument is the header field
        // name and the 2nd is the attribute name.  For example, the "boundary" attribute of the
        // Content-Type header, or the "filename" attribute of Content-Disposition.
        String boundary = mime.getHeaderFieldAttribute("Content-Type", "boundary");
        if (boundary == null) {
            System.out.println(mime.getLastErrorText());
            return;
        }

        System.out.println("Content-Type boundary: " + boundary);
    }
}