eureka 创建服务消费者

1. 创建eureka-consumer子项目

2. 添加pom依赖

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>spring-cloud-demo</artifactId>
        <groupId>com.imooc</groupId>
        <version>1.0.0-SNAPSHOT</version>
        <relativePath>../../pom.xml</relativePath>
    </parent>
    <modelVersion>4.0.0</modelVersion>
    <packaging>jar</packaging>
    <artifactId>eureka-consumer</artifactId>
    <name>eureka-consumer</name>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
    </dependencies>

</project>

3.创建启动类和Controller

3.1 创建启动类

package com.imooc.springcloud;

import org.springframework.boot.WebApplicationType;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;

@SpringBootApplication
@EnableDiscoveryClient
public class EurekaConsumerApplication {

    @Bean
    public RestTemplate register(){
        return new RestTemplate();
    }

    public static void main(String[] args) {
        new SpringApplicationBuilder(EurekaConsumerApplication.class)
                .web(WebApplicationType.SERVLET)
                .run(args);
    }
}

3.2 创建Controller

package com.imooc.springcloud;

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.loadbalancer.LoadBalancerClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

@Slf4j
@RestController
public class Controller {

    @Autowired
    private LoadBalancerClient client;

    @Autowired
    private RestTemplate restTemplate;

    @GetMapping("/hello")
    public String hello(){
        ServiceInstance instance = client.choose("eureka-client");

        if(instance == null){
            return "No available instances";
        }

        String target = String.format("http://%s:%s/sayHi",
                instance.getHost(),
                instance.getPort());

        log.info("uri is {}", target);

        return restTemplate.getForObject(target, String.class);
    }

    @PostMapping("/hello")
    public Friend helloPost(){
        ServiceInstance instance = client.choose("eureka-client");

        if(instance == null){
            return null;
        }

        String target = String.format("http://%s:%s/sayHi",
                instance.getHost(),
                instance.getPort());

        log.info("uri is {}", target);

        Friend friend = new Friend();
        friend.setName("Eureka Consumer");

        return restTemplate.postForObject(target,friend, Friend.class);
    }

}

3.3 Friend 类

package com.imooc.springcloud;

import lombok.Data;

@Data
public class Friend {

    private String name;

    private String port;
}

3.4 配置文件

spring.application.name=eureka-consumer

server.port=31000

eureka.instance.prefer-ip-address=true
eureka.client.serviceUrl.defaultZone=http://localhost:20000/eureka/

4.项目eureka-consumer发起调用