Springcloud学习之整合Eureka（一）

「爱情、让人受尽委屈。」 2023-02-14 06:56 12阅读 0赞

# 前提准备： #

搭建一个聚合工程（父子工程），这边就不在说明了，不会的点这边（用的demo也是这个地址下的）：[链接地址][Link 1]  
[demo下载地址][demo]  
建议看看这个：[Eureka 工作原理][Eureka]  
**目录结构如下：**  
![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzA4NTc5Nw_size_16_color_FFFFFF_t_70][]

# 一、修改父类pom文件 #

在父类的pom中引入依赖，我这边用的springcloud的版本是Hoxton.SR1，根据官网spring官网推荐，Hoxton.SR1对应的springboot版本最好是2.2.2.RELEASE

<dependency>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-dependencies</artifactId>
                    <version>2.2.2.RELEASE</version>
                    <type>pom</type>
                    <scope>import</scope>
                </dependency>
                
                <dependency>
                    <groupId>org.springframework.cloud</groupId>
                    <artifactId>spring-cloud-dependencies</artifactId>
                    <version>Hoxton.SR1</version>
                    <type>pom</type>
                    <scope>import</scope>
                </dependency>

# 二、修改子类cloud-provider-payment8001的pom.xml #

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

# 三、添加公用子工程cloud-api-commons #

cloud-api-commons工程用来存放其它工程的公用类，比如实体类等等（详细过程就不写了，毕竟这篇主要讲的是整合注册中心Eureka，你要是想写简单写个hello world也行）

# 四、添加生产者模块cloud-provider-payment8001 #

cloud-provider-payment8001主要写业务逻辑，这边我就写了个简单的插入查询，具体我怎么写就不贴出来了，你也可以自己写，写个hello world也行 demo在下面。

# 五、添加消费者模块cloud-consumer-order80 #

cloud-consumer-order80主要是调用生产者模块的,我这边是通过RestTemplate发送HTTP请求的，没有用HttpClient，  
**1、建个配置类，将RestTemplate交给spring容器管理，后面要使用就可以通过注入的方式来使用了**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzA4NTc5Nw_size_16_color_FFFFFF_t_70 1]**2、通过RestTemplate访问生产者模块**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzA4NTc5Nw_size_16_color_FFFFFF_t_70 2]**3、可以看到这样消费者调生产者是成功的**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzA4NTc5Nw_size_16_color_FFFFFF_t_70 3]  
**数据库：**

SET NAMES utf8mb4;
    SET FOREIGN_KEY_CHECKS = 0;
    
    -- ----------------------------
    -- Table structure for payment
    -- ----------------------------
    DROP TABLE IF EXISTS `payment`;
    CREATE TABLE `payment`  (
      `id` bigint(20) NOT NULL,
      `serial` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
      PRIMARY KEY (`id`) USING BTREE
    ) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;
    
    -- ----------------------------
    -- Records of payment
    -- ----------------------------
    INSERT INTO `payment` VALUES (223, '哈哈哈');
    INSERT INTO `payment` VALUES (556, '你好啊');
    INSERT INTO `payment` VALUES (557, '你好啊');
    INSERT INTO `payment` VALUES (888, '卡卡');
    
    SET FOREIGN_KEY_CHECKS = 1;

**demo下载地址：**  
链接：https://pan.baidu.com/s/12gqGfDj1H6gvKpFAxo3Y8A  
提取码：ndti

# 六、创建Eureka模块cloud-eureka-server7001和cloud-eureka-server7002 #

**1、application.yml配置文件都一样，只不过是端口号和Eureka服务端名字不一样而已**

server:
      port: 7001
    ##########################################
    #eureka配置
    eureka:
      instance:
        hostname: eureka7001.com    #eureka服务端的实例名字
      client:
        register-with-eureka: false    #表识不向注册中心注册自己
        fetch-registry: false   #表示自己就是注册中心，职责是维护服务实例，并不需要去检索服务
        service-url:
          #集群配置，跟7002互相注册
          defaultZone: http://eureka7002.com:7002/eureka/ #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

**2、启动类要加@EnableEurekaServer注解**

@SpringBootApplication
    @EnableEurekaServer
    public class CloudEurekaServer7002Application { 
        public static void main(String[] args) { 
            SpringApplication.run(CloudEurekaServer7002Application.class,args);
        }
    }

# 七、修改生产者模块cloud-provider-payment8001和消费者模块cloud-consumer-order80 #

**1、生产者模块cloud-provider-payment8001和消费者模块cloud-consumer-order80要添加Eureka依赖**

**2、更改application.yml文件，添加Eureka配置**

#eureka配置
    eureka:
      client:
        register-with-eureka: true    #是否向注册中心注册
        fetch-registry: 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
        service-url:
          defaultZone: http://eureka7001.com:7001/eureka/,http://eureka7002.com:7002/eureka/

**3、生产者8001模块启动类添加@EnableEurekaClient@EnableDiscoveryClient注解**

@SpringBootApplication
    @EnableEurekaClient
    @EnableDiscoveryClient
    @MapperScan(basePackages = { "cn.wwfww.springcloud.mapper"})//不加这句mapper依赖注入不进来
    public class CloudProviderPayment8001Application { 
        public static void main(String[] args) { 
            SpringApplication.run(CloudProviderPayment8001Application.class,args);
        }
    }

**4、消费者模块80，使用@LoadBalanced注解赋予RestTemplate负载均衡能力**

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

**启动：要先启动7001,7002才能启动8001，8002，80，不然会报错，报连接不上7001和7002**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzA4NTc5Nw_size_16_color_FFFFFF_t_70 4]

**[完整demo下载地址][demo 1]：https://download.csdn.net/download/weixin\_43085797/12488827**

[Link 1]: https://blog.csdn.net/weixin_43085797/article/details/106475258
[demo]: https://download.csdn.net/download/weixin_43085797/12485473
[Eureka]: https://blog.csdn.net/qwe86314/article/details/94552801
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[demo 1]: https://download.csdn.net/download/weixin_43085797/12488827