Java验证邮箱是否真实存在有效

import ;

import ;
import ;
import ;
import ;
import ;

public class CheckEmailObj {
public static 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 {
// 查找MX记录
Lookup lookup = new Lookup(hostName, Type.MX);
lookup.run();
if (lookup.getResult() != Lookup.SUCCESSFUL) {
log += "找不到MX记录\n";
return false;
} else {
result = lookup.getAnswers();
}

// 连接到邮箱服务器
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
client.login("");
log += ">HELO \n";
log += "=" + client.getReplyString();

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

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

if (250 == client.getReplyCode()) {
return true;
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
client.disconnect();
} catch (IOException e) {
}
// 打印日志
System.err.println(log);
}
return false;
}

public static void main(String[] args) {
System.err.println("Outcome: "
+ CheckEmailObj.checkEmail("pandajj0703@"));
}
}