1.使用场景：
网关可提供请求路由与组合、协议转换、安全认证、服务鉴权、流量控制与日志监控等服务。可选的网关有不少，比如 Nginx、、Linkerd 、eureka、 Spring Cloud Gateway、consul等。
Spring Cloud Gateway 针对进来的请求做各种判断和处理，比如说判断请求的合法性、权限验证，请求地址改写，请求参数、头信息、cookie 信息的分析和改写，请求速率控制，日志留存等。而这些都可以方便的通过 Predicate 和 GatewayFilter 来组合实现。
2.代码实现
1创建gateway-service服务
引入依赖
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-gateway</artifactId>
<version>3.0.4</version>
</dependency>
<!--服务注册/发现中心依赖-->
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
</dependency>
<!--服务的配置中心依赖-->
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
</dependency>
<!--fegin组件-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-openfeign</artifactId>
<version>3.0.2</version>
</dependency>
<!-- Feign Client for loadBalancing -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-loadbalancer</artifactId>
<version>3.0.2</version>
</dependency>
<!--客户端负载均衡loadbalancer-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-loadbalancer</artifactId>
</dependency>yml配置
server:
port: 8001
spring:
application:
name: gateway-service #服务名
profiles:
active: dev #环境设置
cloud:
gateway:
routes:
# 透传服务
- id: gateway-client #设置路由id(理论上是可以随便写的)
uri: lb://gateway-client #设置路由的url lb://nacos服务注册名称
predicates:
- Path=/client/** #路径匹配规则
filters:
- StripPrefix=1
- id: gateway-consumer
uri: lb://gateway-consumer
predicates:
- Path=/consumer/**
filters:
- StripPrefix=1跨域配置
@Configuration
public class CorsConfig {
@Bean
public CorsWebFilter corsFilter() {
CorsConfiguration config = new CorsConfiguration();
config.addAllowedMethod("*");
config.addAllowedOrigin("*");
config.addAllowedHeader("*");
UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource(new PathPatternParser());
source.registerCorsConfiguration("/**", config);
return new CorsWebFilter(source);
}
}2创建gateway-client服务
引入依赖
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!--服务注册-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
<version>0.2.1.RELEASE</version>
</dependency>
<!--服务调用-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>yml配置
server:
port: 8002
spring:
application:
name: gateway-client #服务名
profiles:
active: dev #环境设置
cloud:
nacos:
discovery:
server-addr: 127.0.0.1:8848 #nacos服务注册控制层请求
@RestController
public class TestController {
@RequestMapping("/index")
public String index(){
return "gateway-client";
}
}启动类
@SpringBootApplication
@EnableDiscoveryClient
public class GatewayClientApplication {
public static void main(String[] args) {
SpringApplication.run(GatewayClientApplication.class, args);
}
}3.实现效果
采用nacos作为注册中心，启动nacos后再启动gateway-service, gateway-client项目
在nacos发现服务注册成功
在浏览器发起请求
http://localhost:8001/client/index
实际上网关把请求发送到gateway-client服务，返回结果
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