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GateWay动态路由与负载均衡详细介绍

作者：做一道光　　发布时间：2022-02-10 15:12:29　

标签：GateWay,动态路由,负载均衡

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/> 
</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/> 
</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

来源：https://blog.csdn.net/weixin_59334478/article/details/127838253

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