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How to determine whether the email is legal in java

coldplay.xixi
coldplay.xixiOriginal
2020-09-02 14:47:525791browse

java判断邮箱是否合法的方法:可以使用正则表达式来判断。具体代码为【boolean b=matcher.matches();if (b) {System.out.println(mail+"有效的邮箱地址!");】。

How to determine whether the email is legal in java

java判断邮箱是否合法的方法:

【相关学习推荐:java课程

使用了正则表达式来进行判断,代码实现如下:

public class Test {
    public static void main(String[] args) {
        //电子邮件
         String check = "^([a-z0-9A-Z]+[-|\\.]?)+[a-z0-9A-Z]@([a-z0-9A-Z]+(-[a-z0-9A-Z]+)?\\.)+[a-zA-Z]{2,}$";
         Pattern regex = Pattern.compile(check);
         Matcher matcher = regex.matcher("dffdfdf@qq.com");
         boolean isMatched = matcher.matches();
         System.out.println(isMatched);
    }
    public static void main(String[] args) {
        Scanner scanner=new Scanner(System.in);
        String mail=null;
        System.out.println("请输入E-Mail:");
        mail=scanner.next();
        Pattern pattern=Pattern.compile("\\w+@(\\w+.)+[a-z]{2,3}");//\w表示a-z,A-Z,0-9(\\转义符)
        Matcher matcher=pattern.matcher(mail);
        boolean b=matcher.matches();
        if (b) {
            System.out.println(mail+"有效的邮箱地址!");
        }else {
            System.out.println(mail+"的格式错误!!");
        }
    }

javascript电子邮箱的合法性验证

  /**
    *
    */
    function isEmail(email)
      {
            var srt=/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/;
              if(srt.test(email))
              {
                  //不合法时
                  return false;
              }
              else
              {
                  //合法时
                return true;
              }
      }
}
public static boolean validateEmail(String email) {
   boolean flag = false;
   int pos = email.indexOf("@");
   if (pos == -1 || pos == 0 || pos == email.length() - 1) {
     return false;
   }
   String[] strings = email.split("@");
   if (strings.length != 2) {// 如果邮箱不是xxx@xxx格式
     return false;
   }
   CharSequence cs = strings[0];
   for (int i = 0; i < cs.length(); i++) {
     char c = cs.charAt(i);
     if (!Character.isLetter(c) && !Character.isDigit(c)) {
       return false;
     }
   }
   pos = strings[1].indexOf(".");// 如果@后面没有.,则是错误的邮箱。
   if (pos == -1 || pos == 0 || pos == email.length() - 1) {
     return false;
   }
   strings = strings[1].split(".");
   for (int j = 0; j < strings.length; j++) {
     cs = strings[j];
     if (cs.length() == 0) {
     return false;
     }
     for (int i = 0; i < cs.length(); i++) {//如果保护不规则的字符,表示错误
       char c = cs.charAt(i);
       if (!Character.isLetter(c) && !Character.isDigit(c)) {
       return false;
       }
     }
   }
   return true;

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