jwt 工具類

public class TokenUtils {
    private Logger logger = LoggerFactory.getLogger(this.getClass());
    /**
     * 簽名秘鑰
     */
    public static final String SECRET = "token";

    /**
     * 生成token
     * @param id 一般傳入userName
     * @return
     */
    public static String createJwtToken(String id){
        String issuer = "";
        String subject = "";
        long ttlMillis = 30*60*1000; 
        return createJwtToken(id, issuer, subject, ttlMillis);
    }

    /**
     * 生成Token
     * 
     * @param id
     *            編號
     * @param issuer
     *            該JWT的簽發者，是否使用是可選的
     * @param subject
     *            該JWT所面向的用戶，是否使用是可選的；
     * @param ttlMillis
     *            簽發時間
     * @return token String
     */
    public static String createJwtToken(String id, String issuer, String subject, long ttlMillis) {

        // 簽名算法 ，將對token進行簽名
        SignatureAlgorithm signatureAlgorithm = SignatureAlgorithm.HS256;

        // 生成簽發時間
        long nowMillis = System.currentTimeMillis();
        Date now = new Date(nowMillis);

        // 通過秘鑰簽名JWT
        byte[] apiKeySecretBytes = DatatypeConverter.parseBase64Binary(SECRET);
        Key signingKey = new SecretKeySpec(apiKeySecretBytes, signatureAlgorithm.getJcaName());

        // Let's set the JWT Claims
        JwtBuilder builder = Jwts.builder().setId(id)
            .setIssuedAt(now)
            .setSubject(subject)
            .setIssuer(issuer)
            .signWith(signatureAlgorithm, signingKey);
        
        // if it has been specified, let's add the expiration
        if (ttlMillis >= 0) {
            long expMillis = nowMillis + ttlMillis;
            Date exp = new Date(expMillis);
            builder.setExpiration(exp);
        }

        // Builds the JWT and serializes it to a compact, URL-safe string
        return builder.compact();

    }

    // Sample method to validate and read the JWT
    public static Claims parseJWT(String jwt) {
        // This line will throw an exception if it is not a signed JWS (as expected)
        Claims claims = Jwts.parser()
            .setSigningKey(DatatypeConverter.parseBase64Binary(SECRET))
            .parseClaimsJws(jwt).getBody();
        return claims;
    }

    public static void main(String[] args) {
        System.out.println(TokenUtils.createJwtToken("admin"));
        System.out.println(TokenUtils.parseJWT("eyJhbGciOiJIUzI1NiJ9.eyJqdGkiOiJhZG1pbiIsImlhdCI6MTUxNzg4NDU0OCwic3ViIjoiIiwiaXNzIjoiIiwiZXhwIjoxNTE3ODg2MzQ4fQ.AxGGAOiwOmnp5oKaSdlmny-zgZigsqgZY8fG_UxVLKs"));
    }
}

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