ssm项目实现用户登陆持久化(token)

<dependency>

     <groupid>com.auth0</groupid>

     <artifactid>java-jwt</artifactid>

     <version>3.3.0</version>

</dependency>

import com.auth0.jwt.jwt;

import com.auth0.jwt.jwtverifier;

import com.auth0.jwt.algorithms.algorithm;

import com.auth0.jwt.interfaces.claim;

import com.auth0.jwt.interfaces.decodedjwt;

public class jwtutils {

     /**

      * 公钥

      */

     private static string secret = "qiang" ;  //此处随便设置一个自己的加密符号

     public static string createtoken(int id, string username,

                                       string type) throws exception {

         // 签发时间

         date iatdate = new date ();

         // 过期时间，7天时间

         calendar nowtime = calendar.getinstance();

         nowtime.add(calendar.hour, 24 * 7);

         date experiesdate = nowtime.gettime();

         map<string, object> map = new hashmap<string, object>();

         map.put( "alg" , "hs256" );

         map.put( "typ" , "jwt" );

         string token = jwt.create()

                 .withheader(map)

                 .withclaim( "id" , id)

                 .withclaim( "username" , username)

                 .withclaim( "type" , type)

                 .withexpiresat(experiesdate) // 设置过期的日期

                 .withissuedat(iatdate) // 签发时间

                 .sign(algorithm.hmac256(secret)); // 加密

         return token;

     }

     /**

      * 解密

      */

     public static map<string, claim> verifytoken(string token) throws exception {

         jwtverifier verifier = jwt. require (algorithm.hmac256(secret)).build();

         decodedjwt jwt = null;

         try {

             jwt = verifier.verify(token);  //核实token

         } catch (exception e) {

             throw new exception( "登录过期" );

         }

         return jwt.getclaims();  //返回的是解析完的token，是一个map，里面有id，username，type键值对

     }

}

<dependency>

     <groupid>redis.clients</groupid>

     <artifactid>jedis</artifactid>

     <version>2.9.0</version>

</dependency>

import redis.clients.jedis.jedis;

public class jedisutils {

     private static jedis jedis;

     //初始化

     private static void init() {

         jedis = new jedis( "localhost" );

     }

     //在redis中设置键值对存储

     public static void settoken(string id, string token, int day) {

         int second = day * 60 * 60 * 24;

         jedisutils.init();

         jedis.set(string.valueof(id), token); //根据id存储token

         jedis.expire(string.valueof(id), second);  //设置token持续时间

     }

     public static string gettoken(string id) {

         jedisutils.init();

         string token = jedis.get(string.valueof(id));  //获取token

         return token;

     }

}