Java工具类--手机号生成与正则校验

package utils;
import java.util.Random;
import java.util.regex.Pattern;
/**
 * Created with IntelliJ IDEA.
 * Description:
 *         手机号正则: ^1[3456789][0-9]{9}
 *         生成手机号工具类
 *
 * @author
 *         Date: 2017-11-09
 *         Time: 10:24
 */
public class PhoneNoGeneratorUtil {
    private static String firstNum = "1";
    private static String[] secondNumArray = {"3", "4", "5", "6", "7", "8", "9"};
    /**
     * 调用一次生成一个手机号，手机号后9位数字通过循环生成
     */
    public String getPhoneNo() {
        StringBuffer sb = new StringBuffer();
        Random random = new Random();
        String secondNum = secondNumArray[random.nextInt(secondNumArray.length)];
        sb.append(firstNum);
        sb.append(secondNum);
        for (int i = 0; i < 9; i++) {
            Integer thirdNum = random.nextInt(10);
            sb.append(thirdNum.toString());
        }
        return sb.toString();
    }
    /**
     * 当需要生成较大量的手机号时调用该方法
     * 后9位数字随机生成，长度不足时则补0
     */
    public String getMultiPhoneNo() {
        StringBuffer sb = new StringBuffer();
        Random random = new Random();
        String secondNum = secondNumArray[random.nextInt(secondNumArray.length)];
        sb.append(firstNum);
        sb.append(secondNum);
        Integer thirdNum = 1 + random.nextInt(999999999);
        if (thirdNum.toString().length() <= 9) {
            sb.append(thirdNum);
            for (int i = 1; i <= 9 - thirdNum.toString().length(); i++) {
                sb.append(0);
            }
        } else {
            sb.append(thirdNum.toString());
        }
        return sb.toString();
    }
    /**
     * 手机号校验
     */
    public boolean checkPhoneNo(String phoneNum) {
        // 定义手机号的规则
        String phoneNumPattern = "^1[3456789][0-9]{9}";
        // 比对phoneNum是否符合定义的规则
        boolean result = Pattern.matches(phoneNumPattern, phoneNum);
        return result;
    }
}