package com.mini.mybigscreen.utils;

import java.util.Random;

public class KeyUtil {

    public static String ObjKey(int length, int type) {
        Random random = new Random();
        StringBuffer key = new StringBuffer();
        if (type == 1) {
            String str = "0123456789";
            for (int i = 0; i < length; ++i) {
                //从62个的数字或字母中选择
                int number = random.nextInt(10);
                //将产生的数字通过length次承载到key中
                key.append(str.charAt(number));
            }
            return key.toString();
        } else if (type == 2) {
            String str = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
            for (int i = 0; i < length; ++i) {
                //从62个的数字或字母中选择
                int number = random.nextInt(36);
                //将产生的数字通过length次承载到key中
                key.append(str.charAt(number));
            }
            return key.toString();
        } else if (type == 3) {
            String str = "abcdefghijklmnopqrstuvwxyz0123456789";
            for (int i = 0; i < length; ++i) {
                //从62个的数字或字母中选择
                int number = random.nextInt(36);
                //将产生的数字通过length次承载到key中
                key.append(str.charAt(number));
            }
            return key.toString();
        } else {
            String str = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
            for (int i = 0; i < length; ++i) {
                //从62个的数字或字母中选择
                int number = random.nextInt(62);
                //将产生的数字通过length次承载到key中
                key.append(str.charAt(number));
            }
            return key.toString();
        }
    }
}