Java验证邮箱是否真实存在有效

最新推荐文章于 2024-01-31 20:17:52 发布

guo_yang

最新推荐文章于 2024-01-31 20:17:52 发布

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本文链接：https://blog.youkuaiyun.com/guo_yang/article/details/82186119

本文介绍如何使用Java编程验证电子邮件地址是否真实有效，探讨相关技术和方法，包括SMTP验证和正则表达式验证。

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Java验证邮箱是否真实存在有效

要检测邮箱是否真实存在，必须了解两方面知识：
1. MX记录，winodws的nslookup命令。查看学习
2. SMTP协议，如何通过telnet发送邮件。查看学习

有个网站可以校验， http://verify-email.org/，不过一小时只允许验证10次。

直接上代码：

JAVA CODE :CheckEmailObj

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;

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 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();

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@gmail.com"));
}
}

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; 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 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(); 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@gmail.com")); } }

需要的两个jar包：
http://www.dnsjava.org/download/
http://apache.etoak.com /commons/net/binaries/commons-net-2.0.zip

执行结果：
MX record about gmail.com exists.
Connection succeeded to alt2.gmail-smtp-in.l.google.com.
220 mx.google.com ESMTP p37si6502151gvf.9
>HELO cyou-inc.com
=250 mx.google.com at your service
>MAIL FROM: <zhaojinglun@cyou-inc.com>
=250 2.1.0 OK p37si6502151gvf.9
>RCPT TO: <pandajj0703@gmail.com>
=250 2.1.5 OK p37si6502151gvf.9

Outcome: true

或者通过webservice实现：

JAVA CODE :CheckEmailWS.java

import java.io.PrintWriter;
import java.net.URL;
import java.net.URLConnection;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.w3c.dom.Document;

public class CheckEmailWS {
public static boolean checkEmail(String email) {
  String soapRequestData = ""
+ "<?xml version=\"1.0\" encoding=\"utf-8\"?>"
+ "<soap:Envelope xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns:soap=\"http://www.w3.org/2003/05/soap-envelope\">"
+ "  <soap:Body>"
+ "   <IsValidEmail xmlns=\"http://www.webservicex.net\">"
+ "    <Email>" + email + "</Email>" + "   </IsValidEmail>"
+ "  </soap:Body>" + "</soap:Envelope>";

try {
   URL u = new URL(
"http://www.webservicex.net/ValidateEmail.asmx?op=IsValidEmail");
   URLConnection uc = u.openConnection();
   uc.setDoOutput(true);
   uc.setRequestProperty("Content-Type",
"application/soap+xml; charset=utf-8");
   PrintWriter pw = new PrintWriter(uc.getOutputStream());
   pw.println(soapRequestData);
   pw.close();

   DocumentBuilderFactory bf = DocumentBuilderFactory.newInstance();
   DocumentBuilder db = bf.newDocumentBuilder();
   Document document = db.parse(uc.getInputStream());

   String res = document.getElementsByTagName("IsValidEmailResult")
.item(0).getTextContent();

return Boolean.parseBoolean(res);
} catch (Exception e) {
   e.printStackTrace();
return false;
}
}