1. 引入jar包

<dependency>
    <groupId>com.auth0</groupId>
    <artifactId>java-jwt</artifactId>
    <version>3.4.0</version>
</dependency>

2. 实现

 1 public class JWTUtil {
 2     //过期时间15分钟
 3     private static final long EXPIRE_TIME = 15*60*1000;
 4     //token秘钥,设置的复杂点这里用一串uuid，并用HMAC256加密的
 5     private static final String TOKEN_SECRET = "JFKDJFKGFGFGIFG8R9589589";
 6     
 7     //生成token
 8     public static String generatorToken(String userName,Stringn userId) {
 9         //过期时间
10         Date date = new Date(System.currentTimeMillis()+EXPIRE_TIME );
11         //秘钥及加密算法
12         Algorithm algorithm = Algorithm.HMAC256(TOKEN_SECRET);
13         //设置头部信息
14         Map<String,Object> header = new HashMap<String,Object>(2);
15         header.put("type","JWT");
16         header.put("alg","HS256");
17         //附带用户信息，生成token
18         return JWT.create()
19             .withHeader(header)
20             .withClaim("userName",userName)
21             .withClaim("userId",userId)
22             .withExpiresAt(date)
23             .sign(algorithm);
24     }
25 }