Springcloud组件gateway网关

1、网关简介

2、GateWay介绍

（1）gateway是SptingCloud组件，用于网关操作

（2）基本概念 路由、断言、过滤器

（3）网关基于filter实现，很多过滤器，组成了过滤链

3、gateway网关使用

（1）创建网关服务

（2）在网关模块引入依赖

<dependencies>
    <dependency>
        <groupId>com.atguigu</groupId>
        <artifactId>common_utils</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </dependency>

    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
    </dependency>

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

    <!--gson-->
    <dependency>
        <groupId>com.google.code.gson</groupId>
        <artifactId>gson</artifactId>
    </dependency>

    <!--服务调用-->
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-openfeign</artifactId>
    </dependency>
</dependencies>

（3）创建启动类

@SpringBootApplication
@EnableDiscoveryClient
public class ApiGatewayApplication {
    public static void main(String[] args) {
        SpringApplication.run(ApiGatewayApplication.class,args);
    }
}

（4）创建配置文件

# 服务端口
server.port=8222
# 服务名
spring.application.name=service-gateway

# nacos服务地址
spring.cloud.nacos.discovery.server-addr=127.0.0.1:8848

#使用服务发现路由
spring.cloud.gateway.discovery.locator.enabled=true
#服务路由名小写
#spring.cloud.gateway.discovery.locator.lower-case-service-id=true

#设置路由id
spring.cloud.gateway.routes[0].id=service-acl
#设置路由的uri
spring.cloud.gateway.routes[0].uri=lb://service-acl
#设置路由断言,代理servicerId为auth-service的/auth/路径
spring.cloud.gateway.routes[0].predicates= Path=/*/acl/**

#配置service-edu服务
spring.cloud.gateway.routes[1].id=service-edu
spring.cloud.gateway.routes[1].uri=lb://service-edu
spring.cloud.gateway.routes[1].predicates= Path=/eduservice/**

#配置service-ucenter服务
spring.cloud.gateway.routes[2].id=service-ucenter
spring.cloud.gateway.routes[2].uri=lb://service-ucenter
spring.cloud.gateway.routes[2].predicates= Path=/ucenterservice/**

#配置service-ucenter服务
spring.cloud.gateway.routes[3].id=service-cms
spring.cloud.gateway.routes[3].uri=lb://service-cms
spring.cloud.gateway.routes[3].predicates= Path=/cmsservice/**

spring.cloud.gateway.routes[4].id=service-msm
spring.cloud.gateway.routes[4].uri=lb://service-msm
spring.cloud.gateway.routes[4].predicates= Path=/edumsm/**

spring.cloud.gateway.routes[5].id=service-order
spring.cloud.gateway.routes[5].uri=lb://service-order
spring.cloud.gateway.routes[5].predicates= Path=/orderservice/**

spring.cloud.gateway.routes[6].id=service-order
spring.cloud.gateway.routes[6].uri=lb://service-order
spring.cloud.gateway.routes[6].predicates= Path=/orderservice/**

spring.cloud.gateway.routes[7].id=service-oss
spring.cloud.gateway.routes[7].uri=lb://service-oss
spring.cloud.gateway.routes[7].predicates= Path=/eduoss/**

spring.cloud.gateway.routes[8].id=service-statistic
spring.cloud.gateway.routes[8].uri=lb://service-statistic
spring.cloud.gateway.routes[8].predicates= Path=/staservice/**

spring.cloud.gateway.routes[9].id=service-vod
spring.cloud.gateway.routes[9].uri=lb://service-vod
spring.cloud.gateway.routes[9].predicates= Path=/eduvod/**

spring.cloud.gateway.routes[10].id=service-edu
spring.cloud.gateway.routes[10].uri=lb://service-edu
spring.cloud.gateway.routes[10].predicates= Path=/eduuser/**

（5）测试一下

4、负载均衡

5、网关扩展

（1）跨域

（2）扩展网关

（3）问题 通过网关添加跨域访问配置，controller类还加上@CrossOrigin 注意：使用网关跨域配置，controller类跨域注解必须去掉