package com.leyou.common.Utils;

import com.sun.corba.se.impl.orbutil.ObjectStreamClassUtil_1_3;
import org.junit.Test;

import java.util.Random;

/*
 * @author iCopper
 * @ 2018/9/23 --21:37
 */
public class MixNumberCharacterUtils {
    public static final String ALLCHAR = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
    public static final String LETTERCHAR = "abcdefghijkllmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
    public static final String NUMBERCHAR = "0123456789";

    /**
     * 返回一个定长的随机字符串(只包含大小写字母、数字)
     *
     * @param length
     *            随机字符串长度
     * @return 随机字符串
     */
    public static String generateString(int length) {
        StringBuffer sb = new StringBuffer();
        Random random = new Random();
        for (int i = 0; i < length; i++) {
            sb.append(ALLCHAR.charAt(random.nextInt(ALLCHAR.length())));
        }
        return sb.toString();
    }


    @Test
    public void testDemo() {
        String code = this.generateString(6);
        System.out.println(code);
    }
}