JAVA开发（token过期续期）

快来打我* 2024-03-30 08:44 28阅读 0赞

**一、需求背景：**

在使用token进行登录的过程中，如果token过期了，需要重新输入用户名和密码登录，这种体验肯定是不好的，因为如果一直在使用系统，系统应该一直能够保持登录状态，而不是用着用着就突然退出系统重新登录。

**二、解决方法：**

生成token的接口需要提供，token和刷新的refresh\_token ,过期时间。当时间快过期时，重新调用后端接口去获取新的token。

token：包含了凭证相关信息（过期时间相对refresh\_token短）

refresh\_token：包含凭证相关信息（过期时间相对token长）

过期时间：给客户端计算何时需要使用refresh\_token来换取新的token

![c02f19ff9d8a453f866ddf5a51d8cec1.png][]

生成token参照，里面在加上 refresh\_token和过期时间就可以。

[JAVA开发（JWTUtil工具类实现token源码赏析）\_茅河野人的博客-CSDN博客][JAVA_JWTUtil_token_-CSDN]

**三、后端验证token的示例：**

**既可以通过过滤器，也可以使用拦截器来拦截。**

import javax.annotation.Resource;
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.cloud.gateway.filter.GatewayFilterChain;
    import org.springframework.cloud.gateway.filter.GlobalFilter;
    import org.springframework.core.Ordered;
    import org.springframework.core.io.buffer.DataBufferFactory;
    import org.springframework.data.redis.core.ValueOperations;
    import org.springframework.http.HttpStatus;
    import org.springframework.http.MediaType;
    import org.springframework.http.server.reactive.ServerHttpRequest;
    import org.springframework.http.server.reactive.ServerHttpResponse;
    import org.springframework.stereotype.Component;
    import org.springframework.web.server.ServerWebExchange;
    import com.alibaba.fastjson.JSON;
    import com.alibaba.fastjson.JSONObject;
    import com.ruoyi.common.core.constant.CacheConstants;
    import com.ruoyi.common.core.constant.Constants;
    import com.ruoyi.common.core.domain.R;
    import com.ruoyi.common.core.utils.StringUtils;
    import com.ruoyi.common.redis.service.RedisService;
    import com.ruoyi.gateway.config.properties.IgnoreWhiteProperties;
    import reactor.core.publisher.Mono;
    
    /**
     * 网关鉴权
     */
    @Component
    public class AuthFilter implements GlobalFilter, Ordered
    {
        private static final Logger log = LoggerFactory.getLogger(AuthFilter.class);
        
        private final static long EXPIRE_TIME = Constants.TOKEN_EXPIRE * 60;
    
        // 排除过滤的 uri 地址，nacos自行添加
        @Autowired
        private IgnoreWhiteProperties ignoreWhite;
    
        @Resource(name = "stringRedisTemplate")
        private ValueOperations<String, String> sops;
        
        @Autowired
        private RedisService redisService;
    
        @Override
        public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain)
        {
            String url = exchange.getRequest().getURI().getPath();
            // 跳过不需要验证的路径
            if (StringUtils.matches(url, ignoreWhite.getWhites()))
            {
                return chain.filter(exchange);
            }
            String token = getToken(exchange.getRequest());
            if (StringUtils.isBlank(token))
            {
                return setUnauthorizedResponse(exchange, "令牌不能为空");
            }
            String userStr = sops.get(getTokenKey(token));
            if (StringUtils.isNull(userStr))
            {
                return setUnauthorizedResponse(exchange, "登录状态已过期");
            }
            JSONObject obj = JSONObject.parseObject(userStr);
            String userid = obj.getString("userid");
            String username = obj.getString("username");
            if (StringUtils.isBlank(userid) || StringUtils.isBlank(username))
            {
                return setUnauthorizedResponse(exchange, "令牌验证失败");
            }
            
            // 设置过期时间
            redisService.expire(getTokenKey(token), EXPIRE_TIME);
            // 设置用户信息到请求
            ServerHttpRequest mutableReq = exchange.getRequest().mutate().header(CacheConstants.DETAILS_USER_ID, userid)
                    .header(CacheConstants.DETAILS_USERNAME, username).build();
            ServerWebExchange mutableExchange = exchange.mutate().request(mutableReq).build();
    
            return chain.filter(mutableExchange);
        }
    
        private Mono<Void> setUnauthorizedResponse(ServerWebExchange exchange, String msg)
        {
            ServerHttpResponse response = exchange.getResponse();
            response.getHeaders().setContentType(MediaType.APPLICATION_JSON);
            response.setStatusCode(HttpStatus.OK);
    
            log.error("[鉴权异常处理]请求路径:{}", exchange.getRequest().getPath());
    
            return response.writeWith(Mono.fromSupplier(() -> {
                DataBufferFactory bufferFactory = response.bufferFactory();
                return bufferFactory.wrap(JSON.toJSONBytes(R.fail(msg)));
            }));
        }
    
        private String getTokenKey(String token)
        {
            return CacheConstants.LOGIN_TOKEN_KEY + token;
        }
    
        /**
         * 获取请求token
         */
        private String getToken(ServerHttpRequest request)
        {
            String token = request.getHeaders().getFirst(CacheConstants.HEADER);
            if (StringUtils.isNotEmpty(token) && token.startsWith(CacheConstants.TOKEN_PREFIX))
            {
                token = token.replace(CacheConstants.TOKEN_PREFIX, "");
            }
            return token;
        }
    
        @Override
        public int getOrder()
        {
            return -200;
        }
    }

![7777280ef5434a4e8d31f8c61660d824.png][]

[c02f19ff9d8a453f866ddf5a51d8cec1.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/7205efd038a2479a906b864ae237bfef.png
[JAVA_JWTUtil_token_-CSDN]: https://blog.csdn.net/dongjing991/article/details/128296561?spm=1001.2014.3001.5502
[7777280ef5434a4e8d31f8c61660d824.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/b8a6e757448b44ae8a94297f790ae7be.png