如何使用swing代码中的正则表达式验证电子邮件ID的JTextField？

Question

我已经尝试了很多这个验证,但我没有得到以下代码的位置

String expression="^[\\w\\-]([\\.\\w])+[\\w]+@([\\w\\-]+\\.)+[A-Z]{2,4}$";.

请帮帮我.

Answer 1

我希望这将有所帮助.单击SWING UI上的"提交"按钮时,在actionListener中编写验证代码.

   Emailvalidator emailValidator = new Emailvalidator();
   if(!emailValidator.validate(emailField.getText().trim())) {
        System.out.print("Invalid Email ID");
        /*
           Action that you want to take. For ex. make email id field red
           or give message box saying invalid email id.
        */
   }

这是单独的类EmailValidator

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();

    }
}

另外,这将使您输入的电子邮件ID格式正确.如果要验证ID,请发送包含确认号的电子邮件,并要求用户在UI上输入该号码,然后继续.