SpringBoot整合Eureka搭建微服务

Posted 2021-02-06 缘故为何

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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>4.0.0</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>2.1.2.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.micro</groupId>
    <artifactId>services</artifactId>
    <version>0.0.1-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>1.4.5.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: 8080

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: 8081
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: 8082
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/