我应该如何验证电子邮件地址的域名部分？我需要先在Java类中列出现有的域名，还是Java的InternetAddress.validate()会自动执行？我已经使用了以下代码：
public static boolean verifyEmailAddress(String regEmail) {
boolean result = true;
try {
InternetAddress emailAddr = new InternetAddress(regEmail);
emailAddr.validate();
} catch (AddressException ex) {
result = false;
}
return result;
}
我认为您从错误的角度来看待了这个问题。从您的应用程序的角度来看，如果一个电子邮件地址可以接收到邮件，它应该被视为 有效（更好，有用）。这就是为什么所有那些论坛都会不断给您发送激活电子邮件的原因 :) 您应该向每个新的电子邮件地址发送一些随机字符串，并将其保留在 隔离 状态，直到用户可以证明他已阅读该密钥。
这是因为域名可能存在，或者DNS中可能存在该域名的MX记录，但这些条件都不能保证该地址是 有效 的 - 再次强调，当您 验证 某些内容时，其实是在声明它可以在以后的代码中用于某些目的，而邮箱地址的目的就是接收邮件。
我认为没有确切有效的方法来验证它。我们所能做的就是验证模式，或者更多地验证邮件域名，例如hhhgggmail.com。但是你如何验证“san@hhhgggmail.com存在”呢？
SMTP确实有一个“VEFY”命令，但几乎所有SMTP服务器都不实现此命令，出于安全原因。
哦，你想验证域名。所有SMTP服务器都需要一个MX DNS记录。您可以使用dnsjava模块进行验证。代码如下：
public static MXRecord digOptimalMxRecords(String domainName) throws TextParseException {
List<MXRecord> records = DNSHelper.digMxRecords(domainName);
if (CollectionUtils.isNotEmpty(records)) {
Collections.sort(records, new Comparator<MXRecord>() {
@Override
public int compare(MXRecord o1, MXRecord o2) {
return o2.getPriority() - o1.getPriority();
}
});
return records.get(0);
}
return null;
}
public static List<MXRecord> digMxRecords(String domainName) throws TextParseException {
List<MXRecord> list = new ArrayList<MXRecord>();
Lookup mxLookupper = new Lookup(domainName, Type.MX);
mxLookupper.run();
if (mxLookupper.getResult() == Lookup.SUCCESSFUL) {
Record[] answers = mxLookupper.getAnswers();
for (Record record : answers) {
list.add((MXRecord) record);
}
}
return list;
}
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.Scanner;
public class EmailValidator {
public static void main(String[] args) {
recursion();
}
static void recursion () {
Scanner scanner = new Scanner(System.in);
System.out.println("Welcome to the game of typing a correct email address!");
System.out.println();
System.out.println("As the game says, enter a correct email address.");
System.out.println();
String snow = scanner.nextLine();
String[] sssp = snow.split("@");
if (sssp.length != 2) {
System.out.println();
System.out.println("This is not a correct email address.");
System.out.println();
recursion();
} else {
String regex = "[^a-z0-9._]";
String regex1 = "^\\.|\\.$";
String regex2 = "\s";
String regex3 = "^$";
String regex7 = "\\._|_\\.";
String regex39 = "__";
String regex19 = "\\.\\.";
String regex20 = "^_|_$";
Pattern pattern = Pattern.compile(regex, Pattern.CASE_INSENSITIVE);
Pattern pattern1 = Pattern.compile(regex1, Pattern.CASE_INSENSITIVE);
Pattern pattern2 = Pattern.compile(regex2, Pattern.CASE_INSENSITIVE);
Pattern pattern3 = Pattern.compile(regex3, Pattern.CASE_INSENSITIVE);
Pattern pattern11 = Pattern.compile(regex7, Pattern.CASE_INSENSITIVE);
Pattern pattern12 = Pattern.compile(regex19, Pattern.CASE_INSENSITIVE);
Pattern pattern13 = Pattern.compile(regex20, Pattern.CASE_INSENSITIVE);
Pattern pattern14 = Pattern.compile(regex39, Pattern.CASE_INSENSITIVE);
Matcher matcher = pattern.matcher(sssp[0]);
Matcher matcher1 = pattern1.matcher(sssp[0]);
Matcher matcher2 = pattern2.matcher(sssp[0]);
Matcher matcher3 = pattern3.matcher(sssp[0]);
Matcher matcher11 = pattern11.matcher(sssp[0]);
Matcher matcher12 = pattern12.matcher(sssp[0]);
Matcher matcher13 = pattern13.matcher(sssp[0]);
Matcher matcher14 = pattern14.matcher(sssp[0]);
boolean matchFound = matcher.find();
boolean matchFound1 = matcher1.find();
boolean matchFound2 = matcher2.find();
boolean matchFound3 = matcher3.find();
boolean matchFound10 = matcher11.find();
boolean matchFound11 = matcher12.find();
boolean matchFound12 = matcher13.find();
boolean matchFound13 = matcher14.find();
String hello = sssp[1];
String[] whoop = hello.split("\\.", 2);
if (whoop.length != 2) {
System.out.println();
System.out.println("This is not a correct email address.");
System.out.println();
recursion();
} else {
String regex4 = "[^a-z]";
String regex5 = "^$";
String regex6 = "\s";
Pattern pattern4 = Pattern.compile(regex4, Pattern.CASE_INSENSITIVE);
Pattern pattern5 = Pattern.compile(regex5, Pattern.CASE_INSENSITIVE);
Pattern pattern6 = Pattern.compile(regex6, Pattern.CASE_INSENSITIVE);
Matcher matcher4 = pattern4.matcher(whoop[0]);
Matcher matcher5 = pattern5.matcher(whoop[0]);
Matcher matcher6 = pattern6.matcher(whoop[0]);
boolean matchFound4 = matcher4.find();
boolean matchFound5 = matcher5.find();
boolean matchFound6 = matcher6.find();
Pattern pattern7 = Pattern.compile(regex4, Pattern.CASE_INSENSITIVE);
Pattern pattern8 = Pattern.compile(regex5, Pattern.CASE_INSENSITIVE);
Pattern pattern9 = Pattern.compile(regex6, Pattern.CASE_INSENSITIVE);
Matcher matcher7 = pattern7.matcher(whoop[1]);
Matcher matcher8 = pattern8.matcher(whoop[1]);
Matcher matcher9 = pattern9.matcher(whoop[1]);
boolean matchFound7 = matcher7.find();
boolean matchFound8 = matcher8.find();
boolean matchFound9 = matcher9.find();
System.out.println();
if(matchFound || matchFound1 || matchFound2 || matchFound3 || matchFound4 || matchFound5 || matchFound6 || matchFound7 || matchFound8 || matchFound9 || matchFound10 || matchFound11 || matchFound12 || matchFound13) {
System.out.println("This is not a correct email address.");
System.out.println();
recursion();
} else {
System.out.println("This is a correct email address.");
System.out.println();
System.out.println("Do you still want to play? (say yes to play) ");
System.out.println();
Scanner scanner1 = new Scanner(System.in);
String snow1 = scanner1.nextLine();
if (snow1.equalsIgnoreCase("yes")) {
System.out.println();
recursion();
} else {
System.out.println();
System.out.println("Okay, then.");
scanner.close();
scanner1.close();
}
}
}
}
}
}