GateWay動態(tài)路由與負載均衡詳細介紹

更新時間：2022年11月17日 14:59:11 作者：做一道光

這篇文章主要介紹了GateWay動態(tài)路由與負載均衡，GateWay支持自動從注冊中心中獲取服務列表并訪問，即所謂的動態(tài)路由

概述

從之前的配置里面我們可以看到我們的 URL 都是寫死的，這不符合我們微服務的要求，我們微服務是只要知道服務的名字，根據(jù)名字去找，而直接寫死就沒有負載均衡的效果了默認情況下 Gateway 會根據(jù)注冊中心的服務列表，以注冊中心上微服務名為路徑創(chuàng)建動態(tài)路由進行轉發(fā)，從而實現(xiàn)動態(tài)路由的功能。

需要注意的是 uri 的協(xié)議為 lb（ load Balance ），表示啟用 Gateway 的負載均衡功能。

lb://serviceName 是 spring cloud gateway 在微服務中自動為我們創(chuàng)建的負載均衡 uri

協(xié)議：就是雙方約定的一個接頭暗號

http ： //

項目實例

1.gateway-server模塊

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 #開啟動態(tài)路由開啟通過應用名稱找到服務的功能
lower-case-service-id: true #開啟服務名稱小寫
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.主函數(shù)類

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模塊

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.主函數(shù)類

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);
    }
}