MD5加密

package com.ctrl.mobile.respUtils;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/**
 * @Author LiPeiMin
 * @Description //TODO MD5加密
 * @Date 11:38 2019/11/18
 **/
public class MD5 {
    private static MessageDigest mdigest = null;
    //String类的toUpperCase()和toLowerCase()方法    这里加密后的是小写的
    private static char digits[] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};

    private static MessageDigest getMdInst() {
        if (null == mdigest) {
            try {
                mdigest = MessageDigest.getInstance("MD5");
            } catch (NoSuchAlgorithmException e) {
                e.printStackTrace();
            }
        }
        return mdigest;
    }
    /**
     * @Description TODO //MD5加密
     * @Param [s]
     * @Return java.lang.String
     * @Author wuyu
     * @Date 13:49 2019/11/29
     */
    public static String encode(String s) {
        if (null == s) {
            return "";
        }
        try {
            byte[] bytes = s.getBytes();
            getMdInst().update(bytes);
            byte[] md = getMdInst().digest();
            int j = md.length;
            char str[] = new char[j * 2];
            int k = 0;
            for (int i = 0; i < j; i++) {
                byte byte0 = md[i];
                str[k++] = digits[byte0 >>> 4 & 0xf];
                str[k++] = digits[byte0 & 0xf];
            }
            return new String(str);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }
}

来源：oschina

链接：https://my.oschina.net/u/4149060/blog/3135456