GateWay动态路由与负载均衡详细介绍
作者:做一道光
概述
从之前的配置里面我们可以看到我们的 URL 都是写死的,这不符合我们微服务的要求,我们微服务是只要知道服务的名字,根据名字去找,而直接写死就没有负载均衡的效果了 默认情况下 Gateway 会根据注册中心的服务列表,以注册中心上微服务名为路径创建动态路 由进行转发,从而实现动态路由的功能。
需要注意的是 uri 的协议为 lb( load Balance ),表示启用 Gateway 的负载均衡功能。
lb://serviceName 是 spring cloud gateway 在微服务中自动为我们创建的负载均衡 uri
协议:就是双方约定的一个接头暗号
http : //
项目实例
1.gateway-server模块
1.1.pom.xml文件
<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.3.12.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.it</groupId> <artifactId>gateway-server</artifactId> <version>0.0.1-SNAPSHOT</version> <name>gateway-server</name> <description>Demo project for Spring Boot</description> <properties> <java.version>1.8</java.version> <spring-cloud.version>Hoxton.SR12</spring-cloud.version> </properties> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-gateway</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-netflix-eureka-client</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies> <dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-dependencies</artifactId> <version>${spring-cloud.version}</version> <type>pom</type> <scope>import</scope> </dependency> </dependencies> </dependencyManagement> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
1.2.application.yml文件
server:
port: 80
spring:
application:
name: gateway-server
cloud:
gateway:
enabled: true
discovery:
locator:
enabled: true #开启动态路由 开启通过应用名称找到服务的功能
lower-case-service-id: true #开启服务名称小写
eureka:
client:
service-url:
defaultZone: http://192.168.174.133:8761/eureka
registry-fetch-interval-seconds: 3
instance:
hostname: localhost
instance-id: ${eureka.instance.hostname}:${spring.application.name}:${server.port}
1.3.主函数类
package com.it; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.netflix.eureka.EnableEurekaClient; @SpringBootApplication @EnableEurekaClient public class GatewayServerApplication { public static void main(String[] args) { SpringApplication.run(GatewayServerApplication.class, args); } }
2.login-service模块
2.1.pom.xml文件
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.3.12.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.it</groupId> <artifactId>login-service</artifactId> <version>0.0.1-SNAPSHOT</version> <name>login-service</name> <description>Demo project for Spring Boot</description> <properties> <java.version>1.8</java.version> <spring-cloud.version>Hoxton.SR12</spring-cloud.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-netflix-eureka-client</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies> <dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-dependencies</artifactId> <version>${spring-cloud.version}</version> <type>pom</type> <scope>import</scope> </dependency> </dependencies> </dependencyManagement> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
2.2.application.yml文件
server:
port: 8081
spring:
application:
name: login-service
eureka:
client:
service-url:
defaultZone: http://192.168.174.133:8761/eureka
registry-fetch-interval-seconds: 3
instance:
hostname: localhost
instance-id: ${eureka.instance.hostname}:${spring.application.name}:${server.port}
2.3.LoginController文件
package com.it.controller; import org.springframework.web.bind.annotation.GetMapping; import java.util.UUID; public class LoginController { @GetMapping("doLogin") public String doLogin(String name,String pwd){ System.out.println(name); System.out.println(pwd); String s = UUID.randomUUID().toString(); return s; } }
2.4.主函数类
package com.it; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.netflix.eureka.EnableEurekaClient; @SpringBootApplication @EnableEurekaClient public class LoginServiceApplication { public static void main(String[] args) { SpringApplication.run(LoginServiceApplication.class, args); } }
3.功能测试
启动动态路由后,访问路径时需要在localhost后面加上,要访问服务的名称,后面再跟上这个服务中的方法接口名
如果不加服务名称,还是按照以前的方法写,会导致访问报404
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