代码如下所示

package com.luocome.blog.util;

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

/**
 * @author 微风
 * @version 1.0
 * @date 2021/1/31 11:59
 */
public class MD5Utils {

    /**
     * md5加密工具类
     * @param str 需要加密的字符串
     * @return    加密后的字符串
     */
    public static String md5(String str){
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            md.update(str.getBytes());
            byte[] byteDigest = md.digest();
            int i;
            StringBuffer buf = new StringBuffer("");
            for (int offset = 0;offset < byteDigest.length;offset++){
                i = byteDigest[offset];
                if (i < 0) {
                    i += 256;
                }
                if (i < 16) {
                    buf.append("0");
                }
                buf.append(Integer.toHexString(i));
            }
            //32位加密
            return buf.toString();
            //16位加密
            //return buf.toString().substring(8,24);
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
            return null;
        }
    }
}