SpringBoot实现无感刷新Token的项目实践

// JWT工具类
@Component
public class JwtUtil {
    
    private String secret = "your-secret-key"; // 密钥
    
    public String generateToken(UserDetails userDetails) {
        // 创建JWT并设置过期时间、载荷信息
        // ...
        return Jwts.builder()
            .setSubject(userDetails.getUsername())
            .setExpiration(new Date(System.currentTimeMillis() + expirationTime))
            .signWith(SignatureAlgorithm.HS512, secret)
            .compact();
    }

    public Boolean validateToken(String token, UserDetails userDetails) {
        // 验证JWT有效性
        // ...
    }

    public String refreshToken(String token) {
        // 从token中提取subject（用户名）
        // 检查Refresh Token有效性
        // 生成新的Access Token
        // ...
    }
}

@Component
public class JwtRequestFilter extends OncePerRequestFilter {

    @Autowired
    private JwtUtil jwtUtil;

    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain chain)
            throws ServletException, IOException {
        
        String authorizationHeader = request.getHeader("Authorization");
        if (authorizationHeader != null && authorizationHeader.startsWith("Bearer ")) {
            String token = authorizationHeader.substring(7); // 获取Token
            String username = jwtUtil.extractUsername(token); // 提取用户名

            // 检查Token是否过期，如果即将过期，则尝试刷新Token
            if (jwtUtil.isTokenAboutToExpire(token)) {
                String refreshedToken = jwtUtil.refreshToken(token);
                // 更新响应头中的Token信息
                // ...
            }
        }

        chain.doFilter(request, response);
    }
}