【SpringCloud技术专题】「Gateway网关系列」（2）微服务网关服务的Gateway功能配置指南分析

spring:
  cloud:
    gateway:
      routes:
      - id: server-center  # 唯一标识，通常使用服务id
        uri: lb://server-center  # 目标URL，lb代表从注册中心获取服务，lb是Load Balance的缩写
        predicates:   # Predicate集合
          - Path=/sample/cloud/v1/server-center/**  # 匹配转发路径
        # Filter集合
        filters:
        # 从第几级开始转发
          - StripPrefix=4
复制代码

<dependencies>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-gateway</artifactId>
    </dependency>
    <!-- Nacos Client -->
    <dependency>
        <groupId>com.alibaba.cloud</groupId>
        <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
    </dependency>
    <!-- actuator -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-actuator</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>
<dependencyManagement>
    <dependencies>
        <!--整合Spring Cloud-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-dependencies</artifactId>
            <version>Greenwich.SR2</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
        <!--整合Spring Cloud Alibaba-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-alibaba-dependencies</artifactId>
            <version>2.1.0.RELEASE</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>
复制代码

server:
  port: 8040
spring:
  application:
    name: gateway
  cloud:
    nacos:
      discovery:
        # 指定nacos server的地址
        server-addr: 127.0.0.1:8848
    gateway:
      discovery:
        locator:
          # gateway通过服务发现组件找到其他的微服务，从而自动转发请求
          enabled: true
# actuator相关配置
management:
  endpoints:
    web:
      exposure:
        # 暴露所有监控端点
        include: '*'
  endpoint:
    health:
      # 总是显示健康检测详情
      show-details: always
复制代码

${GATEWAY_URL}/{微服务名称}/{接口路径}
复制代码

spring:
  cloud:
    gateway:
      routes:
        - id: test_route  # 路由的唯一标识
          uri: http://www.xxx.com
          predicates:
            # 使用通配符匹配
            - Path=/**
复制代码

spring:
  cloud:
    gateway:
      routes:
        - id: test_route  # 路由的唯一标识
          uri: http://www.xxx.com/user/order/detail
          predicates:
            # 指定具体的路径进行匹配
            - Path=/user/order/detail
复制代码

spring:
  cloud:
    gateway:
      routes:
        - id: server-center  # 路由唯一标识，这种形式下通常是微服务名称
          uri: lb://server-center  # lb代表从注册中心获取服务
          predicates:
            # 使用通配符匹配
            - Path=/**
复制代码

spring:
  cloud:
    gateway:
      routes:
        - id: server-center  # 路由的唯一标识，这种形式下通常是微服务名称
          uri: lb://server-center/users/info  # lb代表从注册中心获取服务
          predicates:
            # 指定具体的路径进行匹配
            - Path=/users/info
复制代码

@Data
public class TimeBetweenConfig {
    /**
     * 开始时间
     */
    private LocalTime start;
    /**
     * 结束时间
     */
    private LocalTime end;
}
复制代码

/**
 * 路由谓词工厂必须以RoutePredicateFactory结尾，
 * 这是Spring Cloud Gateway的约定
 **/
@Slf4j
@Component
public class TimeBetweenRoutePredicateFactory extends AbstractRoutePredicateFactory<TimeBetweenConfig> {
    public TimeBetweenRoutePredicateFactory() {
        super(TimeBetweenConfig.class);
    }
    /**
     * 实现谓词判断的方法
     */
    @Override
    public Predicate<ServerWebExchange> apply(TimeBetweenConfig config) {
        return exchange -> {
            LocalTime start = config.getStart();
            LocalTime end = config.getEnd();
            // 判断当前时间是否为允许访问的时间段内
            LocalTime now = LocalTime.now();
            return now.isAfter(start) && now.isBefore(end);
        };
    }
    /**
     * 控制配置类（TimeBetweenConfig）属性和配置文件中配置项（TimeBetween）的映射关系
     */
    @Override
    public List<String> shortcutFieldOrder() {
        /*
         * 例如我们的配置项是：TimeBetween=上午9:00, 下午5:00
         * 那么按照顺序，start对应的是上午9:00；end对应的是下午5:00
         **/
        return Arrays.asList("start", "end");
    }
}
复制代码

spring:
  cloud:
    gateway:
      discovery:
        locator:
          # 禁止gateway通过服务发现组件转发请求到其他的微服务
          enabled: false
      routes:
        - id: server-center
          # 目标URL，lb代表从注册中心获取服务
          uri: lb://server-center
          predicates:
            # 注意名称必须为路由谓词工厂类名的前缀，参数为允许访问的时间段
            - TimeBetween=上午9:00,下午5:00
复制代码

org.springframework.format.support.DefaultFormattingConversionService#addDefaultFormatters
复制代码

org.springframework.format.datetime.standard.DateTimeFormatterRegistrar#registerFormatters
复制代码