package com.hxkj.common.utils;

import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.util.Random;
import java.util.UUID;

public class ToolsUtil {

    /**
     * 制作UUID
     *
     * @author fzr
     * @return String
     */
    public static String makeUUID(){
        return UUID.randomUUID().toString().replaceAll("-","").substring(0,32);
    }

    /**
     * 制作MD5
     *
     * @author fzr
     * @param data 需加密的数据
     * @return String
     */
    public static String makeMd5(String data){
        try {
            MessageDigest md5 = MessageDigest.getInstance("MD5");
            byte [] array = md5.digest(data.getBytes(StandardCharsets.UTF_8));
            StringBuilder sb = new StringBuilder();
            for (byte item : array) {
                sb.append(Integer.toHexString((item & 0xFF) | 0x100).substring(1, 3));
            }
            return sb.toString();
        }catch (Exception e){
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 返回随机字符串
     *
     * @author fzr
     * @param length 要生成的长度
     * @return String
     */
    public static String randomString(int length) {
        Random random = new Random();
        StringBuilder stringBuffer = new StringBuilder();
        String str = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
        int strLength = str.length();
        for (int i = 0; i < length; i++) {
            int index = random.nextInt(strLength);
            stringBuffer.append(str.charAt(index));
        }
        return stringBuffer.toString();
    }

    /**
     * 返回随机数字字符串
     *
     * @author fzr
     * @param length 要生成的长度
     * @return String
     */
    public static String randomInt(int length) {
        Random random = new Random();
        StringBuilder stringBuffer = new StringBuilder();
        String str = "0123456789";
        for (int i = 0; i < length; i++) {
            int index = random.nextInt(10);
            stringBuffer.append(str.charAt(index));
        }
        return stringBuffer.toString();
    }

}