Java验证邮箱是否真实存在有效

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 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 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: client.setSender("[email protected]"); log += ">MAIL FROM: \n"; log += "=" + client.getReplyString(); // RCPT TO: <$email> client.addRecipient(email); log += ">RCPT TO: <" + email + ">\n"; log += "=" + client.getReplyString(); if (250 == client.getReplyCode()) { return true; } } catch (Exception e) { e.printStackTrace(); } finally { try { client.disconnect(); } catch (IOException e) { } // 打印日志 System.err.println(log); } return false; } public static void main(String[] args) { System.err.println("Outcome: " + CheckEmailObj.checkEmail("[email protected]")); } } import java.io.IOException; import org.apache.commons.net.smtp.SMTPClient; import org.apache.commons.net.smtp.SMTPReply; import org.xbill.DNS.Lookup; import org.xbill.DNS.Record; import org.xbill.DNS.Type; public class CheckEmailObj { public static boolean checkEmail(String email) { if (!email.matches("[\\w\\.\\-]+@([\\w\\-]+\\.)+[\\w\\-]+")) { System.err.println("Format error"); return false; } String log = ""; String host = ""; String hostName = email.split("@")[1]; Record[] result = null; SMTPClient client = new SMTPClient(); try { // 查找MX记录 Lookup lookup = new Lookup(hostName, Type.MX); lookup.run(); if (lookup.getResult() != Lookup.SUCCESSFUL) { log += "找不到MX记录\n"; return false; } else { result = lookup.getAnswers(); } // 连接到邮箱服务器 for (int i = 0; i < result.length; i++) { host = result[i].getAdditionalName().toString(); client.connect(host); if (!SMTPReply.isPositiveCompletion(client.getReplyCode())) { client.disconnect(); continue; } else { log += "MX record about " + hostName + " exists.\n"; log += "Connection succeeded to " + host + "\n"; break; } } log += client.getReplyString(); // HELO cyou-inc.com client.login("cyou-inc.com"); log += ">HELO cyou-inc.com\n"; log += "=" + client.getReplyString(); // MAIL FROM: client.setSender("[email protected]"); log += ">MAIL FROM: \n"; log += "=" + client.getReplyString(); // RCPT TO: <$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("[email protected]")); } } 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: =250 2.1.0 OK p37si6502151gvf.9 >RCPT TO: =250 2.1.5 OK p37si6502151gvf.9 Outcome: true 或者通过webservice实现： JAVA CODE :CheckEmailWS.java 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 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 = "" + "" + "" + " " + " " + " " + email + "" + " " + " " + ""; 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; } }