java - 在 Java 中验证电子邮件

Question

我有一张注册表，上面有姓名、电子邮件和密码。确认链接会发送到用户注册时的电子邮件地址。但在发送链接之前，我需要验证电子邮件地址。我用过:

public static boolean verifyEmailAddress(String regEmail) {
    boolean result = true;
    try {
        InternetAddress emailAddr = new InternetAddress(regEmail);
        emailAddr.validate();
    } catch (AddressException ex) {
        result = false;
    }
    return result;
}

它显示有效的任何电子邮件，例如 yutr6767868@huymail.com、k999////@sdmail.com

我从 request.getParameter 获取的电子邮件并将其存储在 regEmail 中。

我到底需要做什么才能让它发挥作用？

Answer 1

好的，这里有 3 个例子 http://www.mkyong.com/regular-expressions/how-to-validate-email-address-with-regular-expression/

我想你需要的是

package com.mkyong.regex;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class EmailValidator{

  private Pattern pattern;
  private Matcher matcher;

  private static final String EMAIL_PATTERN = 
               "^[_A-Za-z0-9-]+(\\.[_A-Za-z0-9-]+)*@
               [A-Za-z0-9]+(\\.[A-Za-z0-9]+)*(\\.[A-Za-z]{2,})$";

  public EmailValidator(){
      pattern = Pattern.compile(EMAIL_PATTERN);
  }

  /**
   * Validate hex with regular expression
   * @param hex hex for validation
   * @return true valid hex, false invalid hex
   */
  public boolean validate(final String hex){

      matcher = pattern.matcher(hex);
      return matcher.matches();

  }

整个组合意味着，电子邮件地址必须以“_A-Za-z0-9-”开头，可选后跟“.[_A-Za-z0-9-]”，并以“@”符号结尾。电子邮件的域名必须以“A-Za-z0-9”开头，后跟一级 Tld(.com、.net)“.[A-Za-z0-9]”，可选后跟二级 Tld ( .com.au, .com.my) “\.[A-Za-z]{2,}”，其中二级 Tld 必须以点“.”开头并且长度必须等于或大于 2 个字符。

例子

package com.mkyong.regex;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class EmailValidator{

  private Pattern pattern;
  private Matcher matcher;

  private static final String EMAIL_PATTERN = 
               "^[_A-Za-z0-9-]+(\\.[_A-Za-z0-9-]+)*@
               [A-Za-z0-9]+(\\.[A-Za-z0-9]+)*(\\.[A-Za-z]{2,})$";

  public EmailValidator(){
      pattern = Pattern.compile(EMAIL_PATTERN);
  }

  /**
   * Validate hex with regular expression
   * @param hex hex for validation
   * @return true valid hex, false invalid hex
   */
  public boolean validate(final String hex){

      matcher = pattern.matcher(hex);
      return matcher.matches();

  }