emailchecker.CheckEmailObj.java Source code

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Here is the source code for emailchecker.CheckEmailObj.java

Source

/*
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 */
package emailchecker;

import java.io.IOException;

import org.apache.commons.net.smtp.SMTPClient;
import org.apache.commons.net.smtp.SMTPReply;
import org.xbill.DNS.Lookup;
import org.xbill.DNS.Record;
import org.xbill.DNS.Type;

/**
 *
 * @author zhongyu
 */

public class CheckEmailObj {

    String log = "";

    public boolean checkEmail(String email) {
        if (!email.matches("[\\w\\.\\-]+@([\\w\\-]+\\.)+[\\w\\-]+")) {
            System.err.println("Format error");
            return false;
        }

        //        String log = "";
        String host = "";
        String hostName = email.split("@")[1];
        Record[] result = null;
        SMTPClient client = new SMTPClient();

        try {
            // MX
            Lookup lookup = new Lookup(hostName, Type.MX);
            lookup.run();
            if (lookup.getResult() != Lookup.SUCCESSFUL) {
                log += "?MX\n";
                return false;
            } else {
                result = lookup.getAnswers();
            }

            // ?
            for (int i = 0; i < result.length; i++) {
                host = result[i].getAdditionalName().toString();
                client.connect(host);
                if (!SMTPReply.isPositiveCompletion(client.getReplyCode())) {
                    client.disconnect();
                    continue;
                } else {
                    log += "MX record about " + hostName + " exists.\n";
                    log += "Connection succeeded to " + host + "\n";
                    break;
                }
            }
            log += client.getReplyString();

            // HELO cyou-inc.com
            client.login("cyou-inc.com");
            log += ">HELO cyou-inc.com\n";
            log += "=" + client.getReplyString();

            // MAIL FROM: <zhaojinglun@cyou-inc.com>
            client.setSender("zhaojinglun@cyou-inc.com");
            log += ">MAIL FROM: <zhaojinglun@cyou-inc.com>\n";
            log += "=" + client.getReplyString();

            // RCPT TO: <$email>
            client.addRecipient(email);
            log += ">RCPT TO: <" + email + ">\n";
            log += "=" + client.getReplyString() + "\n\n";

            if (250 == client.getReplyCode()) {
                return true;
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                client.disconnect();
            } catch (IOException e) {
            }
            // ?

            //  System.err.println(log);

        }
        return false;
    }

}