base64简单实现用户密码加密、解密，将汉字转为拼音（全小写）

package cn.piesat.informationtransfer.utils;


import net.sourceforge.pinyin4j.PinyinHelper;
import net.sourceforge.pinyin4j.format.HanyuPinyinCaseType;
import net.sourceforge.pinyin4j.format.HanyuPinyinOutputFormat;
import net.sourceforge.pinyin4j.format.HanyuPinyinToneType;
import net.sourceforge.pinyin4j.format.HanyuPinyinVCharType;
import net.sourceforge.pinyin4j.format.exception.BadHanyuPinyinOutputFormatCombination;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.util.Base64;


/**
 * cn.piesat.informationtransfer.utils
 *
 * @author 
 * @date 2020/4/24 0024 下午 3:55
 * @description 加密，解密
 */
public class UserUtils {
    /**
     * 密码加密
     *
     * @param password
     * @return
     */
    public static String encodePassword(String password) {
        Base64.Encoder encoder = Base64.getEncoder();
        byte[] bytes = new byte[0];
        try {
            bytes = password.getBytes("UTF-8");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return encoder.encodeToString(bytes);
    }

    /**
     * 解密
     *
     * @param password
     * @return
     */
    public static String decodePassword(String password) {
        Base64.Decoder decoder = Base64.getDecoder();
        byte[] bytes = new byte[0];
        String s = "";
        try {
            bytes = password.getBytes("UTF-8");
            s = new String(decoder.decode(bytes), "UTF-8");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return s;
    }

    /**
     * 校验密码
     *
     * @param password
     * @return
     */
    public static Boolean checkPassword(String password, String oldPassword) {
        String oldPwd = decodePassword(oldPassword);
        if (oldPwd.equals(password))
            return true;
        else
            return false;
    }

    /* 得到中文全拼
    * @param src 需要转化的中文字符串
    * @return
    */
    public static String getPingYin(String src) {
        char[] t1 = null;
        t1 = src.toCharArray();
        String[] t2 = new String[t1.length];
        HanyuPinyinOutputFormat t3 = new HanyuPinyinOutputFormat();
        t3.setCaseType(HanyuPinyinCaseType.LOWERCASE);
        t3.setToneType(HanyuPinyinToneType.WITHOUT_TONE);
        t3.setVCharType(HanyuPinyinVCharType.WITH_V);
        String t4 = "";
        int t0 = t1.length;
        try {
            for (int i = 0; i < t0; i++) {
                // 判断是否为汉字字符
                if (java.lang.Character.toString(t1[i]).matches("[\\u4E00-\\u9FA5]+")) {
                    t2 = PinyinHelper.toHanyuPinyinStringArray(t1[i], t3);
                    t4 += t2[0];
                } else {
                    t4 += java.lang.Character.toString(t1[i]);
                }
            }
            return t4;
        } catch (BadHanyuPinyinOutputFormatCombination e1) {
            e1.printStackTrace();
        }
        return t4;
    }
}

    public static void main(String[] args) {
        String a = "123";
        System.out.println("加密前：" + a);
        String s = encodePassword(a);
        System.out.println("加密后：" + s);
        System.out.println("解密后:" + decodePassword(s));
        String s1 = getPingYin("张三");
        System.out.println(s1);
    }