SpringBoot简单整合Gateway网关

引入依赖

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-gateway</artifactId>
        </dependency>

我和nacos整合了引入了下面的依赖

  <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
            <version>2.1.4.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
            <version>2.1.4.RELEASE</version>
        </dependency>

如果网关有时候请求超时或者卡顿，可以在主启动类中加入

 public static void main(String[] args) {

        System.setProperty(ReactorNetty.NATIVE,"false");
        System.setProperty(ReactorNetty.IO_WORKER_COUNT, "6");
        System.setProperty(ReactorNetty.IO_SELECT_COUNT, "6");
        SpringApplication.run(GatewayApplication.class, args);
    }

统一鉴权过滤器

AuthFilter.java

import com.alibaba.fastjson.JSON;
import com.kotei.gatewayweb.apiResult.ApiResult;
import com.kotei.gatewayweb.config.properties.IgnoreWhiteProperties;
import com.kotei.gatewayweb.config.redis.RedisUtils;
import com.kotei.gatewayweb.utils.JWTUtils;
import org.apache.commons.lang3.StringUtils;
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.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.util.AntPathMatcher;
import org.springframework.util.CollectionUtils;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.util.List;


/**
 * 网关鉴权
 *
 * @author .
 */
@Component
public class AuthFilter implements GlobalFilter, Ordered {
    private static final Logger log = LoggerFactory.getLogger(AuthFilter.class);



    @Autowired
    private RedisUtils redisUtils;


    @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 配置文件里自己添加 list集合格式即可 ，这里是伪代码 所以没有这个类
        if (matches(url, ignoreWhite.getWhites())) {
            log.info(">>>>>>>>跳过该请求验证：{}",url);
            return chain.filter(exchange);
        }

      //这是请求接口中header的token参数值
        String token = exchange.getRequest().getHeaders().getFirst("token");
        if (token == null || !redisUtils.exists(token)) {
            return setUnauthorizedResponse(exchange, "token信息不存在");
        }

      
　　　　　　//验证token是否正确 根据自己的来
        boolean validateJWT = JWTUtils.validateJWT(token);

        if (!validateJWT) {
            return setUnauthorizedResponse(exchange, "令牌验证失败");
        }

        log.info(">>>>>>>>>>>认证执行完成 {}",url);

        return chain.filter(exchange);
    }


    /**
     * 查找指定字符串是否匹配指定字符串列表中的任意一个字符串
     *
     * @param str  指定字符串
     * @param strs 需要检查的字符串数组
     * @return 是否匹配
     */
    public static boolean matches(String str, List<String> strs) {
        if (StringUtils.isEmpty(str) || CollectionUtils.isEmpty(strs)) {
            return false;
        }
        for (String pattern : strs) {
            if (isMatch(pattern,str)) {
                return true;
            }
        }
        return false;
    }

    /**
     * 判断url是否与规则配置:
     * ? 表示单个字符;
     * * 表示一层路径内的任意字符串，不可跨层级;
     * ** 表示任意层路径;
     *
     * @param pattern 匹配规则
     * @param url     需要匹配的url
     * @return
     */
    public static boolean isMatch(String pattern, String url) {
        AntPathMatcher matcher = new AntPathMatcher();
        return matcher.match(pattern, url);
    }

　　//返回错误信息
    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(new ApiResult<>().failure(msg)));
        }));
    }


    @Override
    public int getOrder() {
        return -200;
    }
}

官方文档：https://docs.spring.io/spring-cloud-gateway/docs/current/reference/html/

配置示例（以下是整合nacos的写法，主要是routes部分）

spring:
  cloud:
    gateway:
      discovery:
        locator:
          enabled: true  #让gateway可以发现nacos中的其他微服务, 进行路由转发
      routes:
        - id: api
          uri: lb://api-service
          predicates:
            - Path=/api/**

id：唯一标识，必须唯一

url:转发的服务 lb 是因为使用了注册中心

predicates 断言，表示符合规则就进行转发

-path 表示匹配该请求/api/**规则就转发到 http://api-service/api/** 去

请求路径截取

spring:
  cloud:
    gateway:
      routes:
      - id: nameRoot
        uri: https://nameservice
        predicates:
        - Path=/name/api/**
        filters:
        - StripPrefix=1

使用 StripPrefix 会把 /name/api/** 转发到 https://nameservice/api/**

这里的“1”表示截去的前面的 /name

如果是“2”就表示截去前面的 “/name/api”