MD5加密

UTIL工具类

MD5Util

package com.kude.util;

import org.springframework.util.StringUtils;

import java.security.MessageDigest;

/**
 * @author szj
 * @date 2019/7/20 14:39
 */
public class MD5Util {

    private static String byteArrayToHexString(byte b[]) {
        StringBuffer resultSb = new StringBuffer();
        for (int i = 0; i < b.length; i++)
            resultSb.append(byteToHexString(b[i]));

        return resultSb.toString();
    }

    private static String byteToHexString(byte b) {
        int n = b;
        if (n < 0)
            n += 256;
        int d1 = n / 16;
        int d2 = n % 16;
        return hexDigits[d1] + hexDigits[d2];
    }

    /**
     * 返回大写MD5
     *
     * @param origin
     * @param charsetname
     * @return
     */
    private static String MD5Encode(String origin, String charsetname) {
        String resultString = null;
        try {
            resultString = new String(origin);
            MessageDigest md = MessageDigest.getInstance("MD5");
            if (charsetname == null || "".equals(charsetname))
                resultString = byteArrayToHexString(md.digest(resultString.getBytes()));
            else
                resultString = byteArrayToHexString(md.digest(resultString.getBytes(charsetname)));
        } catch (Exception exception) {
        }
        return resultString.toUpperCase();
    }

    public static String MD5EncodeUtf8(String origin) {
        origin = origin + PropertiesUtil.getProperty("password.salt", "");
        return MD5Encode(origin, "utf-8");
    }


    private static final String hexDigits[] = {"0", "1", "2", "3", "4", "5",
            "6", "7", "8", "9", "a", "b", "c", "d", "e", "f"};

}

PropertiestiesUtil

package com.kude.util;

import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Properties;

/**
 * @author szj
 * @date 2019/7/20 14:39
 */
public class PropertiesUtil {

    private static Logger logger = LoggerFactory.getLogger(PropertiesUtil.class);

    private static Properties props;

    static {
        String fileName = "salt.properties";
        props = new Properties();
        try {
            props.load(new InputStreamReader(PropertiesUtil.class.getClassLoader().getResourceAsStream(fileName),"UTF-8"));
        } catch (IOException e) {
            logger.error("配置文件读取异常",e);
        }
    }

    public static String getProperty(String key){
        String value = props.getProperty(key.trim());
        if(StringUtils.isBlank(value)){
            return null;
        }
        return value.trim();
    }

    public static String getProperty(String key,String defaultValue){

        String value = props.getProperty(key.trim());
        if(StringUtils.isBlank(value)){
            value = defaultValue;
        }
        return value.trim();
    }



}

配置文件

salt.properties

password.salt = geelysdafaqj23ou89ZXcj@#$@#$#@KJdjklj;D../dSF.,

实现层

    public ServerResponse<User> login(int userId,String password){
            UserExample userExample = new UserExample();
            UserExample.Criteria criteria = userExample.createCriteria();
            criteria.andUserIdEqualTo(userId);
            List<User> list = userMapper.selectByExample(userExample);
            if(list.size() == 0){
                return ServerResponse.createByErrorMessage("用户账号不存在");
            }
            String md5Password = MD5Util.MD5EncodeUtf8(password);
            User user = list.get(0);
            if(user.getPassword().equals(password)){
                user.setPassword(StringUtils.EMPTY);
                return ServerResponse.createBySuccess(user);
            }
            return ServerResponse.createByErrorMessage("登陆失败");
    }

（注：本文代码摘自慕课视频）