SpringBoot整合Eureka搭建微服务

1.创建一个services项目，添加三个子模块client（客户端）、service（服务端）、registry（注册中心）

1.1 创建一个services项目

1.2 添加pom.xml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">

    <modelVersion>4.0.</modelVersion>

    <packaging>pom</packaging>

    <modules>

        <module>client</module>

        <module>service</module>

        <module>registry</module>

    </modules>

    <parent>

        <groupId>org.springframework.boot</groupId>

        <artifactId>spring-boot-starter-parent</artifactId>

        <version>2.1..RELEASE</version>

        <relativePath/> <!-- lookup parent from repository -->

    </parent>

    <groupId>com.micro</groupId>

    <artifactId>services</artifactId>

    <version>0.0.-SNAPSHOT</version>

    <name>services</name>

    <description>services</description>

    <properties>

        <java.version>1.8</java.version>

    </properties>

    <dependencies>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-test</artifactId>

            <scope>test</scope>

        </dependency>

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>

            <version>1.4..RELEASE</version>

        </dependency>

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>

        </dependency>

    </dependencies>

    <build>

        <plugins>

            <plugin>

                <groupId>org.springframework.boot</groupId>

                <artifactId>spring-boot-maven-plugin</artifactId>

            </plugin>

        </plugins>

    </build>

    <dependencyManagement>

        <dependencies>

            <dependency>

                <groupId>org.springframework.cloud</groupId>

                <artifactId>spring-cloud-dependencies</artifactId>

                <version>Finchley.RELEASE</version>

                <type>pom</type>

                <scope>import</scope>

            </dependency>

        </dependencies>

    </dependencyManagement>

</project>

1.3 添加子模块client（客户端）

1.4 添加子模块service（服务端）

1.5 添加子模块registry（注册中心）

2.搭建registry（注册中心）

2.1 application.yml 配置

server:

  port:

eureka:

  instance:

    hostname: localhost

  client:

    registerWithEureka: false

    fetchRegistry: false

2.2 编写启动程序

package com.services.registry;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

@SpringBootApplication

@EnableEurekaServer

public class RegistryApplication {

    public static void main(String[] args) {

        SpringApplication.run(RegistryApplication.class);

    }

}

3.搭建service（服务端）

3.1 application.yml 配置

server:

  port:

spring:

  application:

    name: service

eureka:

  client:

    serviceUrl:

      defaultZone: http://localhost:8080/eureka/

3.2 编写启动程序

package com.services.service;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

@SpringBootApplication

@EnableDiscoveryClient

public class ServiceApplication {

    public static void main(String[] args) {

        SpringApplication.run(ServiceApplication.class, args);

    }

}

3.3 编写服务

package com.services.service;

import org.springframework.web.bind.annotation.PathVariable;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RestController;

@RestController

public class HelloWorldController {

    @RequestMapping("hello/{name}")

    public String hello(@PathVariable String name) {

        return name + " say hello";

    }

}

4.搭建client（客户端）

4.1 application.yml 配置

server:

  port:

spring:

  application:

    name: client

eureka:

  client:

    serviceUrl:

      defaultZone: http://localhost:8080/eureka/

app:

  service-url: http://localhost:8081/

4.2 编写启动程序

package com.services.client;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

import org.springframework.context.annotation.Bean;

import org.springframework.web.client.RestTemplate;

@SpringBootApplication

@EnableDiscoveryClient

public class ClientApplication {

    public static void main(String[] args) {

        SpringApplication.run(ClientApplication.class, args);

    }

    @Bean

    RestTemplate restTemplate() {

        return new RestTemplate();

    }

}

4.3 编写service

package com.services.client;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.beans.factory.annotation.Value;

import org.springframework.http.ResponseEntity;

import org.springframework.stereotype.Service;

import org.springframework.web.client.RestTemplate;

@Service

public class CallHelloService {

    @Value("${app.service-url}")

    private String appServiceUrl;

    @Autowired

    private RestTemplate restTemplate;

    public String callHello(String name) {

        // 是一个http client

        ResponseEntity result = restTemplate.postForEntity(appServiceUrl + "hello/" + name, null, String.class);

        return result.getBody().toString();

    }

}

4.4 编写controller

package com.services.client;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.web.bind.annotation.GetMapping;

import org.springframework.web.bind.annotation.RestController;

@RestController

public class CallHelloController {

    @Autowired

    private CallHelloService callHelloService;

    @GetMapping("hello")

    public String hello(String name) {

        String result = callHelloService.callHello(name);

        return result;

    }

}

5.启动registry-service-client模块

5.1 registry

http://localhost:8080/

5.2 service

刷新网页 http://localhost:8080/

5.3 client

刷新网页 http://localhost:8080/

client 访问 http://localhost:8082/hello?name=tao

源码地址： https://github.com/80905949/SpringCloud.git