添加依赖

<dependency>
    <groupId>io.jsonwebtoken</groupId>
    <artifactId>jjwt</artifactId>
    <version>0.6.0</version>
</dependency>

工具类

public class JwtUtil {

    //盐值
    private static String key = "秘钥";

    private static long ttl = Constants.TimeValue.HOUR_2;//2个小时

    public String getKey() {
        return key;
    }

    public void setKey(String key) {
        this.key = key;
    }

    public long getTtl() {
        return ttl;
    }

    public void setTtl(long ttl) {
        this.ttl = ttl;
    }

    /**
     * @param claims 载荷内容
     * @param ttl    有效时长
     * @return
     */
    public static String createToken(Map<String, Object> claims, long ttl) {
        JwtUtil.ttl = ttl;
        return createToken(claims);
    }


    public static String createRefreshToken(String userId, long ttl) {
        long nowMillis = System.currentTimeMillis();
        Date now = new Date(nowMillis);
        JwtBuilder builder = Jwts.builder().setId(userId)
                .setIssuedAt(now)
                .signWith(SignatureAlgorithm.HS256, key);
        if (ttl > 0) {
            builder.setExpiration(new Date(nowMillis + ttl));
        }
        return builder.compact();
    }

    /**
     * @param claims 载荷
     * @return token
     */
    public static String createToken(Map<String, Object> claims) {

        long nowMillis = System.currentTimeMillis();
        Date now = new Date(nowMillis);
        JwtBuilder builder = Jwts.builder()
                .setIssuedAt(now)
                .signWith(SignatureAlgorithm.HS256, key);

        if (claims != null) {
            builder.setClaims(claims);
        }

        if (ttl > 0) {
            builder.setExpiration(new Date(nowMillis + ttl));
        }
        return builder.compact();
    }

    public static Claims parseJWT(String jwtStr) {
        return Jwts.parser()
                .setSigningKey(key)
                .parseClaimsJws(jwtStr)
                .getBody();
    }

}

生成token

public class TestCreateToken {
    public static void main(String[] args) {
        Map<String, Object> claims = new HashMap<>();
        claims.put("id", "722250648279580673");
        claims.put("userName", "测试用户");
        claims.put("role", "role_normal");
        claims.put("avatar", "https://cdn.sunofbeaches.com/images/default_avatar.png");
        claims.put("email", "test@sunofbeach.net");
        String token = JwtUtil.createToken(
                claims);//有效期为1分钟
        System.out.println(token);
    }
}

解析Token

public class TestParesToken {
    public static void main(String[] args) {
        Claims claims = JwtUtil.parseJWT("eyJhbGciOiJIUzI1NiJ9.eyJyb2xlIjoicm9sZV9ub3JtYWwiLCJpZCI6IjcyMjI1MDY0ODI3OTU4MDY3MyIsImF2YXRhciI6Imh0dHBzOi8vY2RuLnN1bm9mYmVhY2hlcy5jb20vaW1hZ2VzL2RlZmF1bHRfYXZhdGFyLnBuZyIsInVzZXJOYW1lIjoi5rWL6K-V55So5oi3IiwiZXhwIjoxNTkyNDk3NzM5LCJlbWFpbCI6InRlc3RAc3Vub2ZiZWFjaC5uZXQifQ.OHAMya4equKtfWqutVQyKo--b47sexg086iWgtqxG2M");
        //==============================================//
        Object id = claims.get("id");
        Object name = claims.get("userName");
        Object role = claims.get("role");
        Object avatar = claims.get("avatar");
        Object email = claims.get("email");

        System.out.println("id == > " + id);
        System.out.println("name == > " + name);
        System.out.println("role == > " + role);
        System.out.println("avatar == > " + avatar);
        System.out.println("email == > " + email);
    }
}