SpringCloud2020版

技术	版本
cloud	Hoxton.SR1
boot	2.2.2.RELEASE
cloud alibaba	2.1.0.RELEASE
java	java8
Maven	3.5及以上
Mysql	5.7及以上

1. 新建Maven父工程 cloud2020

maven架构选择org.apache.maven.archetypes:maven-archetype-site
pom.xml代码如下

<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>4.0.0modelVersion>

<groupId>com.atguigu.springcloudgroupId>
<artifactId>cloud2020artifactId>
<version>1.0-SNAPSHOTversion>
<packaging>pompackaging>

<name>Mavenname>

<url>http://maven.apache.org/url>
<inceptionYear>2001inceptionYear>

<distributionManagement>
<site>
<id>websiteid>
<url>scp://webhost.company.com/www/websiteurl>
site>
distributionManagement>

<properties>
<project.build.sourceEncoding>UTF-8project.build.sourceEncoding>
<maven.compiler.source>1.8maven.compiler.source>
<maven.compiler.target>1.8maven.compiler.target>
<junit.version>4.12junit.version>
<log4j.version>1.2.17log4j.version>
<lombok.version>1.16.18lombok.version>
<mysql.version>5.1.47mysql.version>
<druid.version>1.1.16druid.version>
<mybatis.spring.boot.version>1.3.0mybatis.spring.boot.version>
properties>

<dependencyManagement>
<dependencies>

<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-dependenciesartifactId>
<version>2.2.2.RELEASEversion>
<type>pomtype>
<scope>importscope>
dependency>

<dependency>
<groupId>org.springframework.cloudgroupId>
<artifactId>spring-cloud-dependenciesartifactId>
<version>Hoxton.SR1version>
<type>pomtype>
<scope>importscope>
dependency>

<dependency>
<groupId>com.alibaba.cloudgroupId>
<artifactId>spring-cloud-alibaba-dependenciesartifactId>
<version>2.1.0.RELEASEversion>
<type>pomtype>
<scope>importscope>
dependency>
<dependency>
<groupId>mysqlgroupId>
<artifactId>mysql-connector-javaartifactId>
<version>KaTeX parse error: Expected 'EOF', got '&' at position 96: …n punctuation">&̲lt;/vers…{druid.version}version>
dependency>
<dependency>
<groupId>org.mybatis.spring.bootgroupId>
<artifactId>mybatis-spring-boot-starterartifactId>
<version>KaTeX parse error: Expected 'EOF', got '&' at position 110: …n punctuation">&̲lt;/vers…{junit.version}version>
dependency>
<dependency>
<groupId>org.projectlombokgroupId>
<artifactId>lombokartifactId>
<version>${lombok.version}version>
<optional>trueoptional>
dependency>
dependencies>
dependencyManagement>

<build>
<plugins>
<plugin>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-maven-pluginartifactId>
<configuration>
<fork>truefork>
<addResources>trueaddResources>
configuration>
plugin>
plugins>
build>
project>

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2. 建立支付module: cloud-provider-payment8001

项目结构：

2.1 pom.xml如下：

<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>cloud2020artifactId>
        <groupId>com.atguigu.springcloudgroupId>
        <version>1.0-SNAPSHOTversion>
    parent>
    <modelVersion>4.0.0modelVersion>
<artifactId>cloud-provider-payment8001</artifactId>

<dependencies>
    <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>
    <dependency>
        <groupId>org.mybatis.spring.boot</groupId>
        <artifactId>mybatis-spring-boot-starter</artifactId>
    </dependency>
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid-spring-boot-starter</artifactId>
        <version>1.1.10</version>
    </dependency>
    <!--mysql-connector-java-->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-jdbc</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
        <scope>runtime</scope>
        <optional>true</optional>
    </dependency>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <optional>true</optional>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>

project>

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2.2 application.yml

server:
  port: 8001

spring:
application:
name: cloud-provider-service
datasource:
type: com.alibaba.druid.pool.DruidDataSource #当前数据源操作类型
driver-class-name: org.gjt.mm.mysql.Driver #mysql驱动包
url: jdbc:mysql://localhost:3306/db2019?useUnicode=true&characterEncoding-utr-8&useSSL=false
username: root
password: root

mybatis:
mapper-locations: classpath:mapper/*.xml
type-aliases-package: com.atguigu.springcloud.entities #所有Entity别名类所在包

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2.3 主启动类 PaymentMain8001

package com.atguigu.springcloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class PaymentMain8001 {

public static void main(String[] args) {
    SpringApplication.run(PaymentMain8001.class,args);
}

}

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2.4 数据库

建库：

CREATE TABLE `payment`(
	`id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT 'ID',
	`serial` varchar(200) DEFAULT '',
	PRIMARY KEY (`id`)
) ENGING=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8

   
   
   
   

   
   
   
   

    
    
    
    
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2.5 业务类

//主实体类 Payment
package com.atguigu.springcloud.entities;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class Payment {
private Long id;
private String serial;

}

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//Json封装体CommentResult,传给前端，判断编码是否成功，成功才显示
package com.atguigu.springcloud.entities;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@AllArgsConstructor
@NoArgsConstructor
public class CommonResult<T> {  //泛型：如果装的payment 返回payment,装的order 返回order
private Integer code;
private String message;
private T data;

public CommonResult(Integer code,String message){
    this(code,message,null);
}

}

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//PaymentDao
package com.atguigu.springcloud.dao;
import com.atguigu.springcloud.entities.Payment;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;

@Mapper
public interface PaymentDao {
int create(Payment payment);

Payment getPaymentById(@Param("id") Long id);

}

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<mapper namespace="com.atguigu.springcloud.dao.PaymentDao">
    <insert id="create" parameterType="Payment" useGeneratedKeys="true" keyProperty="id">
        insert into payment(serial) values(#{serial})
    insert>
<resultMap id="BaseResultMap" type="com.atguigu.springcloud.entities.Payment">
    <id column="id" property="id" jdbcType="BIGINT"/>
    <result column="serial" property="serial" jdbcType="VARCHAR"/>
</resultMap>
<select id="getPaymentById" parameterType="Long" resultMap="BaseResultMap">
    select * from payment where id=#{id};
</select>

mapper>

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//PaymentService
package com.atguigu.springcloud.service;
import com.atguigu.springcloud.entities.Payment;
import org.apache.ibatis.annotations.Param;
public interface PaymentService {
    public int create(Payment payment);
public Payment getPaymentById(@Param("id") Long id);

}

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//PaymentServiceImpl
package com.atguigu.springcloud.service;
import com.atguigu.springcloud.dao.PaymentDao;
import com.atguigu.springcloud.entities.Payment;
import org.springframework.stereotype.Service;
import javax.annotation.Resource;
@Service
public class PaymentServiceImpl implements PaymentService{
    @Resource
    private PaymentDao paymentDao;
public int create(Payment payment){
    return paymentDao.create(payment);
}
public Payment getPaymentById(Long id){
    return paymentDao.getPaymentById(id);
}

}

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//PaymentController
package com.atguigu.springcloud.controller;

import com.atguigu.springcloud.entities.CommonResult;
import com.atguigu.springcloud.entities.Payment;
import com.atguigu.springcloud.service.PaymentService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RestController;
import javax.annotation.Resource;
@RestController
@Slf4j
public class PaymentController {
@Resource
private PaymentService paymentService;

//只传给前端CommonResult，不需要前端了解其他的组件
@PostMapping(value = "/payment/create")
public CommonResult create(Payment payment){
    int result = paymentService.create(payment);
    log.info("*****插入结果："+result);
    if(result > 0){
        return new CommonResult(200,"插入数据成功",result);
    }else{
        return new CommonResult(444,"插入数据失败",null);
    }
}
@GetMapping(value = "/payment/get/{id}")
public CommonResult getPaymentById(@PathVariable("id") Long id){
    Payment payment = paymentService.getPaymentById(id);
    log.info("*****插入结果："+payment);
    if(payment != null){
        return new CommonResult(200,"查询成功",payment);
    }else{
        return new CommonResult(444,"没有对应记录,查询ID："+id,null);
    }
}

}

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2.6测试

Chrom浏览器可能不支持Post请求，可以使用PostMan工具测试


总结： 1. 建module 2. 改pom 3. 写yml 4. 主启动 5. 业务类

3. 建立消费者订单module:

3.1 pom.xml

<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>cloud2020artifactId>
        <groupId>com.atguigu.springcloudgroupId>
        <version>1.0-SNAPSHOTversion>
    parent>
    <modelVersion>4.0.0modelVersion>
<artifactId>cloud-consumer-order80</artifactId>

<dependencies>
    <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>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
        <scope>runtime</scope>
        <optional>true</optional>
    </dependency>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <optional>true</optional>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>

project>

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3.2 application.yml

server:
  port: 80

   
   
   
   

   
   
   
   

    
    
    
    
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3.3 主启动

package com.atguigu.springcloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class OrderMain80 {
    public static void main(String[] args) {
        SpringApplication.run(OrderMain80.class,args);
    }
}

   
   
   
   

   
   
   
   

    
    
    
    
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3.4业务类

订单也需要Payment、CommonResult实体类，但是不需要操作数据库，没有Service、Dao，只需添加Controller即可。

//Payment
package com.atguigu.springcloud.entities;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class Payment {
private Long id;
private String serial;
}

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//CommonResult
package com.atguigu.springcloud.entities;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class CommonResult<T> { //泛型：如果装的payment 返回payment,装的order 返回order

private Integer code;
private String message;
private T data;

public CommonResult(Integer code,String message){
    this(code,message,null);
}

}

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首说RestTemplate： RestTemplate提供了多种便捷访问远程Http服务的方法，是一种简单便捷的访问restful服务模板类，是Spring提供的用于访问Rest服务的客户端模板工具集，实现80到8001的远程调用。
官网地址：
https://docs.spring.io/spring-framework/docs/5.2.2.RELEASE/javadoc-api/org/springframework/web/client/RestTemplate.html
使用：
使用restTemplate访问restful接口非常的简单粗暴，（url、requestMap、ResponseBean.class）这三个参数分别代表REST请求地址、请求参数、HTTP响应转换被转换成的对象类型。

将RestTemplate对象注册到容器中

package com.atguigu.springcloud.config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;

@Configuration
public class ApplicationContextConfig {
@Bean
public RestTemplate getRestTemplate(){
return new RestTemplate();
}
}

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package com.atguigu.springcloud.controller;
import com.atguigu.springcloud.entities.CommonResult;
import com.atguigu.springcloud.entities.Payment;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;
import javax.annotation.Resource;

@RestController
@Slf4j
public class OrderController {
private static final String PAYMENT_URL=“http://localhost:8001”;
@Resource
private RestTemplate restTemplate;

@GetMapping("/consumer/payment/create")
public CommonResult<Payment> create(Payment payment){
    return restTemplate.postForObject(PAYMENT_URL+"/payment/create",payment,CommonResult.class);
}

@GetMapping("/consumer/payment/get/{id}")
public CommonResult<Payment> getPayment(@PathVariable("id") Long id){
    return restTemplate.getForObject(PAYMENT_URL+"/payment/get/"+id,CommonResult.class);
}

}

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3.5启动80、8001服务，测试

80服务调用8001服务，实现效果如下：

• 查询：
  
• 添加：
  
  浏览器并没有返回错误，但是我们来看数据库：
  
  可以看到数据库只插入主键，并没有插入内容，要在8001的PaymentController加@RequestBody注解。
  
  然后就可以插入了
  

4. 工程重构

项目中存在相同的代码（entities包下的Payment.class和CommonResult.class）,造成代码冗余，可以进行重构。
通过Maven聚合父工程，把相同重复的代码移到公开公用的工程里面，还可以放第三方接口、工具类，统一调配使用。

4.1 建立公共module

4.2 pom.xml

<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>cloud2020artifactId>
        <groupId>com.atguigu.springcloudgroupId>
        <version>1.0-SNAPSHOTversion>
    parent>
    <modelVersion>4.0.0modelVersion>
<artifactId>cloud-api-commons</artifactId>

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
        <scope>runtime</scope>
        <optional>true</optional>
    </dependency>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <optional>true</optional>
    </dependency>
    <dependency>
        <groupId>cn.hutool</groupId>
        <artifactId>hutool-all</artifactId>
        <version>5.1.0</version>
    </dependency>
</dependencies>

project>

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4.3 将entities包复制到cloud-api-commons

4.4 使用Maven打包发布上传到公用本地库里

打开Maven窗口，执行clean测试一下，无误后出现BUILD SUCCESS，然后执行install

4.5 删除重复entities，引入maven install的jar包坐标即可使用。

<dependency>
	<groupId>com.atguigu.springcloudgroupId>
    <artifactId>cloud-api-commonsartifactId>
    <version>${project.version}version>
dependency>

   
   
   
   

   
   
   
   

    
    
    
    
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5.EurekaServer服务端安装

5.1建module cloud-eureka-server7001

5.2 pom.xml

<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>cloud2020artifactId>
        <groupId>com.atguigu.springcloudgroupId>
        <version>1.0-SNAPSHOTversion>
    parent>
    <modelVersion>4.0.0modelVersion>
<artifactId>cloud-eureka-server7001</artifactId>

<dependencies>
    <!--eureka server-->
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
    </dependency>
    <!--引入自己定义的api通用包，可以使用payment支付Entity-->
    <dependency>
        <groupId>com.atguigu.springcloud</groupId>
        <artifactId>cloud-api-commons</artifactId>
        <version>${project.version}</version>
    </dependency>
    <!--boot web actuator-->
    <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>
    <!--一般通用配置-->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
        <scope>runtime</scope>
        <optional>true</optional>
    </dependency>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
    </dependency>
</dependencies>

project>

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5.3 application.yml

server:
  port: 7001

eureka:
instance:
hostname: localhost #eureka服务端的实例名称
client:
#false表示不向注册中心注册自己
register-with-eureka: false
#false表示自己端就是注册中心，我的职责就是维护服务实例，并不需要去检索服务
fetch-registry: false
service-url:
#设置与Eureka Server交互的地址查询服务和注册服务都需要依赖这个地址
defaultZ4 one: http://$<spanclass="tokenpunctuation"></span>eureka.instance.hostname<spanclass="tokenpunctuation"></span><spanclass="tokenpunctuation">:</span>${server.port}/eureka/

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5.4 主启动类

package com.atguigu.springcloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

@SpringBootApplication
@EnableEurekaServer
public class EurekaMain7001 {
public static void main(String[] args) {
SpringApplication.run(EurekaMain7001.class,args);
}
}

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这是个服务注册中心，主要干的活就是服务注册，不需要写业务类。
但是注意：Eureka有两个组件，一定要标清楚哪个是Server，哪个是Client。@EnableEurekaServer代表服务注册中心

5.5测试

出现上面图标，表示Eureka 服务端安装成功。No instances available表示当前没有服务注册进来

6. 单机Eureka构建：支付微服务8001入驻进eurekaServer

6.1将 Eureka-client 依赖引入，便于使用注解@EnableEurekaClient标注这是个Eureka Client端

<dependency>
	<groupId>org.springframework.cloudgroupId>
    <artifactId>spring-cloud-starter-netflix-eureka-clientartifactId>
dependency>

   
   
   
   

   
   
   
   

    
    
    
    
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6.2 在application.yml添加Eureka相关配置

eureka:
  client:
    #表示是否将自己注册进EurekaServer默认为true
    register-with-eureka: true
    #是否从EurekaServer抓取已有的注册信息，默认为true。单节点无所谓，集群必须设置为true才能配合ribbon使用负载均衡
    fetch-registry: true
    service-url:
      defaultZone: http://localhost:7001/eureka

   
   
   
   

   
   
   
   

    
    
    
    
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6.3 主启动类添加注解@EnableEurekaClient

6.4 测试

注意： 要先启动EurekaServer

这样就注册进来了，入住进Eureka服务器的名称就是8001yml中配置的spring.application.name。红色警告是Eureka的自我保护机制，后面会详细说。

7. 单机Eureka构建：订单微服务入驻进eurekaServer

7.1 在pom添加 Eureka-client依赖

<dependency>
	<groupId>org.springframework.cloudgroupId>
    <artifactId>spring-cloud-starter-netflix-eureka-clientartifactId>
dependency>

   
   
   
   

   
   
   
   

    
    
    
    
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7.2 在application.yml添加相关配置

spring:
  application:
    name: cloud-order-server

eureka:
client:
#表示是否将自己注册进EurekaServer默认为true
register-with-eureka: true
fetch-registry: true
service-url:
defaultZone: http://localhost:7001/eureka

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7.3 主启动类添加注解@EnableEurekaClient

7.4 测试

PS： 先启动EurekaServer，7001服务，再启动服务提供者provider，8001服务

cloud-order-server服务以入住，查询功能也可以正常执行

8. EurekaServer集群环境构建

8.1 创建module cloud-eureka-server7002

8.2 pom.xml

<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>cloud2020artifactId>
        <groupId>com.atguigu.springcloudgroupId>
        <version>1.0-SNAPSHOTversion>
    parent>
    <modelVersion>4.0.0modelVersion>
<artifactId>cloud-eureka-server7002</artifactId>

<dependencies>
    <!--eureka-server-->
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
    </dependency>
    <!--引入自定义的api通用包，可以使用Payment支付Entity-->
    <dependency>
        <groupId>com.atguigu.springcloud</groupId>
        <artifactId>cloud-api-commons</artifactId>
        <version>${project.version}</version>
    </dependency>
    <!--boot web actuator-->
    <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>
    <!--一般通用配置-->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
        <scope>runtime</scope>
        <optional>true</optional>
    </dependency>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
    </dependency>
</dependencies>

project>

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8.3 写yml之前修改映射文件

找到 C:\Windows\System32\drivers\etc路径下的hosts文件

修改映射配置添加进hosts文件

8.4 修改7001和7002的application.yml

8.5 主启动类

package com.atguigu.springcloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

@SpringBootApplication
@EnableEurekaServer
public class EurekaMain7002 {
public static void main(String[] args) {
SpringApplication.run(EurekaMain7002.class,args);
}
}

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8.6测试

启动7001、7002


使用域名映射：


同时看到Eureka图标，且7001指着7002，7002指着7001，说明Eureka集群搭建成功。

9. 将两个微服务发布到Eureka集群配置中

只需修改application.yml

测试

PS： 先启动EurekaServer，7001/7002服务；再启动服务提供者provider，8001；再启动消费者，80



现在，就已经把支付服务8001、订单服务80注册进Eureka集群环境，调用也OK。

10. 支付提供者8001集群环境搭建

10.1 创建module cloud-provider-payment8002

10.2 pom.xml 同8001的 pom.xml 一样

10.3 写application.yml，注意改端口

10.4 主启动类和业务类直接从8001拷贝

10.5 修改8001和8002的controller，默认的负载均衡方式是轮询，看执行查询具体调用那台provider

10.6 测试

PS： 启动顺序：7001、7002、8001、8002、80




8001和8002也都访问正常，那如果我们用80访问呢？发现怎么刷新都是8001，这是因为我们的源程序地址是写死的：

单机版写死是没有问题的，但是现在有8001、8002了，所有不应该再关注具体的IP和端口，而是只认服务名称。代码修改为一下在试。

@RestController
@Slf4j
public class OrderController {
    //private static final String PAYMENT_URL="http://localhost:8001";
    //通过在eureka上注册过的微服务名称调用
    private static final String PAYMENT_URL = "http://CLOUD-PROVIDER-SERVICE";
@Resource
private RestTemplate restTemplate;

@GetMapping("/consumer/payment/create")
public CommonResult<Payment> create(Payment payment){
    return restTemplate.postForObject(PAYMENT_URL+"/payment/create",payment,CommonResult.class);
}

@GetMapping("/consumer/payment/get/{id}")
public CommonResult<Payment> getPayment(@PathVariable("id") Long id){
    return restTemplate.getForObject(PAYMENT_URL+"/payment/get/"+id,CommonResult.class);
}

}

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发现报错了，现在对外暴露的不再是地址和端口，只认微服务名称了，可是微服务并不知道下面有几个，找不到这个主机名称，需要使用#LoadBalanced注解开启RestTemplate负载均衡功能。
提前说一下：这个就是后面要介绍的Ribbon负载均衡功能。

然后测试，多次刷新，就会发现8001、8002端口交替出现。

这样Ribbon和Eureka整合后Consumer可以直接调用服务而不用再关心地址和端口号，且该服务还有负载均衡功能了。O(∩_∩)O

这个架构是初级篇里面的重点，务必要学会，难的是后面的Alibaba的Nacos，也有服务注册和配置中心，Alibaba Nacos集群就比这个复杂了

初级篇完结，后续请在博客分类中查找。