spring cloud alibaba nacos 負載均衡

搭建一個nacos負載均衡的demo 從provider 和 consumer做起

使用IDEA創建springboot項目 provider

• 依賴

	<properties>
        <java.version>1.8</java.version>
        <spring-cloud-alibaba.version>2.2.0.RELEASE</spring-cloud-alibaba.version>
    </properties>

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

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                <version>${spring-cloud-alibaba.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>

• 啓動類

@SpringBootApplication
@EnableDiscoveryClient
public class NacosProvider1Application {
	@Value("${server.port}")
	private String SERVER_PORT;
    public static void main(String[] args) {
        SpringApplication.run(NacosProvider1Application.class, args);
    }
    @RestController
    class EchoController {

        @GetMapping("/echo/{string}")
        public String echo(@PathVariable String string) {
            return "Hello 1 " + SERVER_PORT;
        }
    }
}

• 配置文件

spring.application.name=nacos-provider
spring.cloud.nacos.discovery.server-addr=10.36.0.134:8848

• 打包運行兩個provider

java -jar xxx.jar --server.port=8081
java -jar xxx.jar --server.port=8082

使用IDEA創建springboot項目 consumer

依賴和provider一樣

• 啓動類

@SpringBootApplication
@EnableDiscoveryClient
public class NacosConsumerApplication {
    @LoadBalanced
    @Bean
    public RestTemplate restTemplate() {
        return new RestTemplate();
    }

    public static void main(String[] args) {
        SpringApplication.run(NacosConsumerApplication.class, args);
    }

    @RestController
    public class TestController {
        @Autowired
        private RestTemplate restTemplate;

        @GetMapping("/echo/{str}")
        public String echo(@PathVariable String str) {
            return restTemplate.getForObject("http://nacos-provider/echo/" + str, String.class);
        }

    }
}