基于JWT的用户token验证

1. 基于session的用户验证

2. 基于token的用户身份验证

3. jwt

jwt代码实现方式

1. 导包

<dependency><groupId>com.auth0</groupId><artifactId>java-jwt</artifactId><version>3.18.2</version>
</dependency>

2. 在登录用户接口返回token（当用户登录时返回token）

登录接口

@PostMapping("/user-tokens")
public JsonResponse<String> login(@RequestBody User user) throws Exception {String token = userService.login(user);return new JsonResponse<>(token);
}

public String login(User user) throws Exception {// 判断用户登录逻辑...//如果用户登录成功，返回token,token基于用户idString token = TokenUtil.generateToken(user.getId());return token;}

public class TokenUtil {private static final String ISSUER = "签发者";// 创建tokenpublic static String generateToken(Long userId) throws Exception {Algorithm algorithm = Algorithm.RSA256(RSAUtil.getPublicKey(),RSAUtil.getPrivateKey());Calendar calendar = Calendar.getInstance();calendar.setTime(new Date());calendar.add(Calendar.SECOND,30);return JWT.create().withKeyId(String.valueOf(userId)).withIssuer(ISSUER).withExpiresAt(calendar.getTime()).sign(algorithm);}}

上面的代码会通过用户id生成一个token,前端可以得到token，然后将token报错在浏览器内存里

然后前端只要发送请求，都会带着token

服务端通过token获取用户信息

@GetMapping()
public User getUserInfo(){Long userId = userSupport.getCurrentUserId();User user = userService.getUserInfo(userId);return user;
}

先通过传过来的heander，得到token

public Long getCurrentUserId(){ServletRequestAttributes requestAttributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();String token = requestAttributes.getRequest().getHeader("token");Long userId = TokenUtil.verifyToken(token);if(userId < 0){throw new ConditionException("非法用户");}return userId;
}

然后验证token，获得用户id

public class TokenUtil {private static final String ISSUER = "签发者";// 验证tokenpublic static Long verifyToken(String token){try {Algorithm algorithm = Algorithm.RSA256(RSAUtil.getPublicKey(), RSAUtil.getPrivateKey());JWTVerifier verifier = JWT.require(algorithm).build();DecodedJWT jwt = verifier.verify(token);String userId = jwt.getKeyId();return Long.valueOf(userId);}catch (TokenExpiredException e){throw new ConditionException("555","token过期!");}catch (Exception e){throw new ConditionException("非法token");}}
}

最后通过用户id获得用户信息