3.springcloud alibaba整合gateway_springcloud alibaba整合spring-cloud-starter-gateway

一.gateway简介

springcloud gateway是springcloud全家桶的一个组件之一，替代了之前zuul。springcloud gateway组件的功能很强大，可以让我们很容易实现路由，白名单，限流，鉴权等功能，对于微服务系统来说，gateway就是系统的门户，是必不可少的一环。

二.添加依赖

注：这里贴出来的是部分关键依赖，篇幅有限，详情请下载源码：https://gitee.com/superamxing/simple-demo

<dependency>
<groupId>com.alibaba.cloud</groupId>
    <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-gateway</artifactId>
    <exclusions>
        <exclusion>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </exclusion>
    </exclusions>
</dependency>
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-openfeign-core</artifactId>
</dependency>
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18

添加好依赖，然后再启动类上加上@EnableFeignClients，@EnableDiscoveryClient，@SpringBootApplication三个注解，分别是开启Feign客户端，服务注册和Springboot程序的核心注解：

@EnableFeignClients
@EnableDiscoveryClient
@SpringBootApplication
public class LibraryGatewayApplication {

    @LoadBalanced
    @Bean
    public RestTemplate restTemplate() {
        return new RestTemplate();
    }
    
    public static void main(String[] args) {
        SpringApplication.run(LibraryGatewayApplication.class, args);
    }
}
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15

然后再启动一个项目library-client，以/api/user/login接口为例，在网关项目的yml文件中添加如下配置，具体gateway的路由功能需要大家参考官方文档来钻研学习：

server:
  port: 8888
spring:
  cloud:
    nacos:
      discovery:
        server-addr: ${NACOS_HOST}:${NACOS_PORT}
      config:
        server-addr: ${NACOS_HOST}:${NACOS_PORT}
        file-extension: yml
      username: nacos
      password: nacos
    gateway:
      discovery:
        locator:
          enabled: true
      routes:
      - id: library-client
        uri: lb://library-client
        predicates:
        - Path=/library-client/api/**
        filters:
        - StripPrefix=1
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://${MYSQL_HOST}:${MYSQL_PORT}/db_library?useSSL=false&allowPublicKeyRetrieval=true&serverTimezone=UTC
    username: root
    password: root
  application:
    name: library-gateway
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30

分别启动好两个项目，网管项目library-gateway和客户端项目library-client

然后我们直接可以通过调用网关服务（服务端口为8888），然后路由到library-client.