前后端分离项目，token的生成及存储至redis数据库

MD5加密类

package common;

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

public class MD5 {

    public static String getMd5(String plainText,int length ) {
        String result = "";
        try {
            MessageDigest md= MessageDigest.getInstance("MD5");

            md.update(plainText.getBytes());
            byte b[] = md.digest();
            int i;
            StringBuffer buf = new StringBuffer("");
            for (int offset = 0; offset < b.length; offset++) {
                i = b[offset];
                if(i<0) i+= 256;
                if(i<16)
                    buf.append("0");
                buf.append(Integer.toHexString(i));
            }
            if(length==32) {
                //32位加密
                result = buf.toString();
            }else if(length==16) {
                //16位加密
                result = buf.toString().substring(8, 24);
            }else if(length==6){

                result = buf.toString().substring(0, 6);
            }else {
                return "";
            }
        } catch (NoSuchAlgorithmException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        return result;
    }


}

redis数据库类

package service.serviceImpl;

import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;

public class RedisAPI {