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Spring Cloud Gateway网关搭建教程

pom.xml依赖

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>szxblog</artifactId>
        <groupId>com.songzixian</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>blog-gateway</artifactId>
    <packaging>jar</packaging>
    <url>https://songzixian.com</url>
    <inceptionYear>2020-Now</inceptionYear>


    <dependencies>
        <!-- Spring Boot Begin -->
        <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>
        <!-- Spring Boot End -->
        <!-- Spring Cloud Begin -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <dependency>
            <!-- 主要增加了gateway-->
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-gateway</artifactId>
        </dependency>
        <!-- Spring Cloud End -->
        <!-- Commons Begin -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
        </dependency>
        <!-- Commons Begin -->
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <mainClass>.GatewayApplication</mainClass>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

创建GatewayApplication启动类,并解决跨域问题

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.cloud.gateway.discovery.DiscoveryClientRouteDefinitionLocator;
import org.springframework.cloud.gateway.discovery.DiscoveryLocatorProperties;
import org.springframework.cloud.gateway.route.RouteDefinitionLocator;
import org.springframework.context.annotation.Bean;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.HttpStatus;
import org.springframework.http.codec.ServerCodecConfigurer;
import org.springframework.http.codec.support.DefaultServerCodecConfigurer;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.web.cors.reactive.CorsUtils;
import org.springframework.web.server.ServerWebExchange;
import org.springframework.web.server.WebFilter;
import org.springframework.web.server.WebFilterChain;
import reactor.core.publisher.Mono;

/**
 * <p>
 * Description:
 * </p>
 *
 * @author songzixian
 * @version v1.0.0
 * @create 2020-01-22 15:21
 * @see com.songzixian.gateway
 */
@SpringBootApplication
public class GatewayApplication {
    // ----------------------------- 解决跨域 Begin -----------------------------
    private static final String ALL = "*";
    private static final String MAX_AGE = "3600L";
    @Bean
    public RouteDefinitionLocator discoveryClientRouteDefinitionLocator(DiscoveryClient discoveryClient, DiscoveryLocatorProperties properties) {
        return new DiscoveryClientRouteDefinitionLocator(discoveryClient, properties);
    }
    @Bean
    public ServerCodecConfigurer serverCodecConfigurer() {
        return new DefaultServerCodecConfigurer();
    }
    @Bean
    public WebFilter corsFilter() {
        return (ServerWebExchange ctx, WebFilterChain chain) -> {
            ServerHttpRequest request = ctx.getRequest();
            if (!CorsUtils.isCorsRequest(request)) {
                return chain.filter(ctx);
            }
            HttpHeaders requestHeaders = request.getHeaders();
            ServerHttpResponse response = ctx.getResponse();
            HttpMethod requestMethod = requestHeaders.getAccessControlRequestMethod();
            HttpHeaders headers = response.getHeaders();
            headers.add(HttpHeaders.ACCESS_CONTROL_ALLOW_ORIGIN, requestHeaders.getOrigin());
            headers.addAll(HttpHeaders.ACCESS_CONTROL_ALLOW_HEADERS, requestHeaders.getAccessControlRequestHeaders());
            if (requestMethod != null) {
                headers.add(HttpHeaders.ACCESS_CONTROL_ALLOW_METHODS, requestMethod.name());
            }
            headers.add(HttpHeaders.ACCESS_CONTROL_ALLOW_CREDENTIALS, "true");
            headers.add(HttpHeaders.ACCESS_CONTROL_EXPOSE_HEADERS, ALL);
            headers.add(HttpHeaders.ACCESS_CONTROL_MAX_AGE, MAX_AGE);
            if (request.getMethod() == HttpMethod.OPTIONS) {
                response.setStatusCode(HttpStatus.OK);
                return Mono.empty();
            }
            return chain.filter(ctx);
        };
    }
    // ----------------------------- 解决跨域 End -----------------------------

    //主程序入口
    public static void main(String[] args) {
        SpringApplication.run(GatewayApplication.class, args);
    }
}

创建application.yml文件

base:
  config:
    nacos:
      hostname: 106.54.187.185
      port: 8848
spring:
  application:
    # 应用名称
    name: blog-gateway
  main:
    allow-bean-definition-overriding: true
  cloud:
    # 使用 Nacos 作为服务注册发现
    nacos:
      discovery:
        server-addr: ${base.config.nacos.hostname}:${base.config.nacos.port}
    # 路由网关配置
    gateway:
      # 设置与服务注册发现组件结合，这样可以采用服务名的路由策略
      discovery:
        locator:
          enabled: true
      # 配置路由规则
      routes:
        # 采用自定义路由 ID（有固定用法，不同的 id 有不同的功能，详见：https://cloud.spring.io/spring-cloud-gateway/2.0.x/single/spring-cloud-gateway.html#gateway-route-filters）
        - id: BLOG-BUSINESS-OAUTH2
          # 采用 LoadBalanceClient 方式请求，以 lb:// 开头，后面的是注册在 Nacos 上的服务名
          uri: lb://blog-business-oauth2
          # Predicate 翻译过来是“谓词”的意思，必须，主要作用是匹配用户的请求，有很多种用法
          predicates:
            # 路径匹配，以 api 开头，直接配置是不生效的，看 filters 配置
            - Path=/api/user/**
          filters:
            # 前缀过滤，默认配置下，我们的请求路径是 http://localhost:8888/business-oauth2/** 这时会路由到指定的服务
            # 此处配置去掉 1 个路径前缀，再配置上面的 Path=/api/**，就能按照 http://localhost:8888/api/** 的方式访问了
            - StripPrefix=1
        - id: BLOG-BUSINESS-USERMANAGEMENT-SERVICE
          uri: lb://blog-business-usermanagement-service
          predicates:
            - Path=/api/usermanagement/**
          filters:
            - StripPrefix=1
server:
  port: 8888

# 配置日志级别，方别调试
logging:
  level:
    org.springframework.cloud.gateway: debug

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