Token

 //校验token(新)
    public static CheckResult validateJWT(String jwtStr) {
        CheckResult checkResult = new CheckResult();
        Claims claims = new DefaultClaims();
        try {
            Map  jwtClaims = parser(jwtStr);
            String id = MapUtils.getString(jwtClaims, ID);
            String user_name = MapUtils.getString(jwtClaims, USER_NAME);
            claims.setId(id);
            claims.setSubject(user_name);
            checkResult.setSuccess(true);
            checkResult.setClaims(claims);
        } catch (ExpiredJwtException e) {
            checkResult.setErrCode(Constant.JWT_ERRCODE_EXPIRE);
            checkResult.setSuccess(false);
        } catch (SignatureException e) {
            checkResult.setErrCode(Constant.JWT_ERRCODE_FAIL);
            checkResult.setSuccess(false);
        } catch (Exception e) {
            checkResult.setErrCode(Constant.JWT_ERRCODE_FAIL);
            checkResult.setSuccess(false);
        }
        /*String id = MapUtils.getString(jwtClaims, ID);
        String user_name = MapUtils.getString(jwtClaims, USER_NAME);*/
        return checkResult;

    }



    //重新定义生成token
    public static String createJWT(String id, String subject, long ttlMillis) throws IOException {
        User user = new User();
        user.setId(Long.parseLong(id));
        user.setUserName(subject);
        String uuid = UUID.randomUUID().toString();
        user.setToken(uuid);
        String jwtToken = createJWTToken(user,ttlMillis);
        return jwtToken;
    }


    //jwt解析
    private static Map parser(String jwtStr) {
        if ("null".equals(jwtStr) || StringUtils.isBlank(jwtStr)) {
            return null;
        }
        Map<String, Object> jwtClaims = Jwts.parser().setSigningKey(getKeyInstance()).parseClaimsJws(jwtStr).getBody();

        return jwtClaims;
    }


    private String getUUIDFromJWT(String jwtToken) {
        if ("null".equals(jwtToken) || StringUtils.isBlank(jwtToken)) {
            return null;
        }
        try {
            Map<String, Object> jwtClaims = Jwts.parser().setSigningKey(getKeyInstance()).parseClaimsJws(jwtToken).getBody();
            return MapUtils.getString(jwtClaims, LOGIN_USER_KEY);
        } catch (Exception e) {
            e.printStackTrace();
        }

        return null;
    }

    private static String getTokenKey(String uuid) {
        return "tokens:" + uuid;
    }

    private static final String LOGIN_USER_KEY = "LOGIN_USER_KEY";

    private static final String ID = "ID";

    private static final String USER_NAME = "USER_NAME";

    private static String createJWTToken(User user, long ttlMillis) {

        Map<String, Object> claims = new HashMap<>();
        // 放入一个随机字符串，通过该串可找到登陆用户
        claims.put(LOGIN_USER_KEY, user.getToken());
        claims.put(ID,user.getId());
        claims.put(USER_NAME,user.getUserName());

        long nowMillis = System.currentTimeMillis();
        Date now = new Date(nowMillis);

        Long expMillis = null;
        String jwtToken = null;
        if (ttlMillis >= 0) {
            expMillis = nowMillis + ttlMillis;
            Date expDate = new Date(expMillis);
            jwtToken = Jwts.builder()
                    .setId(String.valueOf(user.getId()))
                    .setSubject(user.getUserName())
                    .setIssuedAt(now)
                    .setClaims(claims)
                    .setExpiration(expDate)
                    .signWith(SignatureAlgorithm.HS256, getKeyInstance())
                    .compact();
        }

        return jwtToken;
    }

    private static Key KEY = null;

    //私钥
    private static String jwtSecret = "";

    private static Key getKeyInstance() {
        if (KEY == null) {
            synchronized (TokenServiceJWTImpl.class) {
                // 双重锁
                if (KEY == null) {
                    byte[] apiKeySecretBytes = DatatypeConverter.parseBase64Binary(jwtSecret);
                    KEY = new SecretKeySpec(apiKeySecretBytes, SignatureAlgorithm.HS256.getJcaName());
                }
            }
        }
        return KEY;
    }

来源：CSDN

作者：亦、相牵

链接：https://blog.csdn.net/weixin_45637293/article/details/104021013